/* ========================================================
   HalloDeutsch - Mobile-First Duolingo-Grade Styling
   ======================================================== */

:root {
    --primary: #58cc02;
    --primary-dark: #46a302;
    --primary-light: #d7ffb8;
    --blue: #1cb0f6;
    --blue-dark: #1899d6;
    --blue-light: #ddf4ff;
    --orange: #ff9600;
    --orange-dark: #e68600;
    --orange-light: #fff0d4;
    --red: #ff4b4b;
    --red-dark: #d63838;
    --red-light: #ffdfe0;
    --purple: #ce82ff;
    --purple-dark: #b562e8;
    --yellow: #ffc800;
    --gray-bg: #f7f9fa;
    --gray-border: #e5e5e5;
    --gray-text: #777777;
    --gray-light: #f1f3f4;
    --dark-text: #3c3c3c;
    --surface: #ffffff;
    --shadow-3d: 0 4px 0;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 9999px;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --app-max-width: 580px;
}

/* Dark Mode Overrides */
body.dark-mode {
    --gray-bg: #131f24;
    --surface: #1e2c33;
    --gray-border: #2e3e47;
    --dark-text: #f0f3f5;
    --gray-text: #8aa2ae;
    --gray-light: #25363f;
    --primary-light: #1f3f1e;
    --red-light: #3f1f23;
    --blue-light: #183344;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-stack);
    background-color: var(--gray-bg);
    color: var(--dark-text);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    width: 100%;
    overflow-x: hidden;
}

#main-layout-wrapper {
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
    min-width: 0;
}

/* App Container (Mobile viewport priority, scales gracefully) */
#app-shell {
    width: 100%;
    max-width: var(--app-max-width);
    margin: 0 auto;
    min-width: 0;
    min-height: 100vh;
    background-color: var(--surface);
    display: flex;
    flex-direction: column;
    position: relative;
    box-shadow: 0 0 40px rgba(0, 0, 0, 0.06);
    padding-bottom: calc(75px + env(safe-area-inset-bottom, 0px)); /* Room for bottom navigation and gesture bar */
    padding-top: env(safe-area-inset-top, 0px);
    overflow-x: hidden;
    box-sizing: border-box;
}

/* ----------------------------------------------------
   3D Tactile Buttons (Duolingo signature tactile press)
   ---------------------------------------------------- */
.btn-3d {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    padding: 13px 20px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: transform 0.08s ease, box-shadow 0.08s ease, background-color 0.15s ease;
    user-select: none;
    text-decoration: none;
    outline: none;
    width: 100%;
    position: relative;
}

.btn-3d:active, .btn-3d.pressed {
    transform: translateY(3px);
}

/* Primary Green Button */
.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    box-shadow: var(--shadow-3d) var(--primary-dark);
}
.btn-primary:active, .btn-primary.pressed {
    box-shadow: 0 1px 0 var(--primary-dark);
}

/* Sky Blue Button */
.btn-blue {
    background-color: var(--blue);
    color: #ffffff;
    box-shadow: var(--shadow-3d) var(--blue-dark);
}
.btn-blue:active, .btn-blue.pressed {
    box-shadow: 0 1px 0 var(--blue-dark);
}

/* Outline / Secondary Button */
.btn-outline {
    background-color: var(--surface);
    color: var(--dark-text);
    border: 2px solid var(--gray-border);
    box-shadow: var(--shadow-3d) var(--gray-border);
}
.btn-outline:active, .btn-outline.pressed {
    box-shadow: 0 1px 0 var(--gray-border);
}

/* Danger Red Button */
.btn-danger {
    background-color: var(--red);
    color: #ffffff;
    box-shadow: var(--shadow-3d) var(--red-dark);
}
.btn-danger:active, .btn-danger.pressed {
    box-shadow: 0 1px 0 var(--red-dark);
}

/* Disabled State */
.btn-3d:disabled, .btn-3d.disabled {
    background-color: #e5e5e5;
    color: #afafaf;
    box-shadow: var(--shadow-3d) #cccccc;
    cursor: not-allowed;
    transform: none;
}

/* ----------------------------------------------------
   Top Header Bar
   ---------------------------------------------------- */
.top-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: var(--surface);
    border-bottom: 2px solid var(--gray-border);
    padding: 8px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    box-sizing: border-box;
    gap: 8px;
    min-height: 52px;
}

.header-group {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
}

/* CEFR Level Selector Pill */
.level-picker-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background-color: var(--gray-light);
    border: 1.5px solid var(--gray-border);
    border-radius: var(--radius-pill);
    padding: 4px 8px;
    font-weight: 800;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.15s ease;
    flex-shrink: 0;
    line-height: 1.2;
}
.level-picker-pill:hover {
    background-color: var(--gray-border);
}
.level-picker-pill .flag-icon {
    font-size: 15px;
    line-height: 1;
}
.level-picker-pill .picker-arrow {
    font-size: 8px;
    color: var(--gray-text);
}

/* Dual Voice Selector Pill */
.voice-picker-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background-color: var(--blue-light);
    border: 1.5px solid var(--blue);
    color: var(--blue-dark);
    border-radius: var(--radius-pill);
    padding: 4px 9px;
    font-weight: 800;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.15s ease;
    flex-shrink: 0;
    user-select: none;
    box-shadow: 0 1.5px 0 var(--blue);
    line-height: 1.2;
}
.voice-picker-pill:hover {
    filter: brightness(1.05);
}
.voice-picker-pill:active {
    transform: translateY(1.5px);
    box-shadow: none;
}
.voice-persona-icon {
    font-size: 14px;
    line-height: 1;
}

.voice-switch-btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: #ffffff;
    border: 2px solid var(--blue);
    border-radius: var(--radius-pill);
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 800;
    color: var(--blue-dark);
    cursor: pointer;
    box-shadow: 0 2px 0 var(--blue);
    transition: all 0.1s ease;
}
.voice-switch-btn:hover {
    background: var(--blue-light);
}
.voice-switch-btn:active {
    transform: translateY(2px);
    box-shadow: none;
}

/* Bilingual Language Switcher (English & Bangla) */
.lang-switcher-pill {
    display: inline-flex;
    align-items: center;
    background: var(--gray-light);
    border: 1.5px solid var(--gray-border);
    border-radius: var(--radius-pill);
    padding: 2px;
    gap: 1px;
    flex-shrink: 0;
}
.lang-btn {
    border: none;
    background: transparent;
    padding: 3px 7px;
    font-size: 11px;
    font-weight: 800;
    color: var(--gray-text);
    border-radius: var(--radius-pill);
    cursor: pointer;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    user-select: none;
    line-height: 1.2;
}
.lang-btn:hover {
    color: var(--dark-text);
}
.lang-btn.active {
    background: var(--surface);
    color: var(--blue-dark);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}
body.dark-mode .lang-btn.active {
    background: #2a3c46;
    color: var(--blue);
}

/* Stats Badges (Streak, Gems, Hearts) */
.header-stats {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.stat-pill {
    display: flex;
    align-items: center;
    gap: 3px;
    font-weight: 800;
    font-size: 13px;
    line-height: 1.2;
}
.stat-pill.streak { color: var(--orange); }
.stat-pill.gems { color: var(--blue); }
.stat-pill.hearts { color: var(--red); }

.stat-pill .icon {
    font-size: 15px;
    line-height: 1;
    display: inline-block;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.stat-pill.streak:hover .icon {
    transform: scale(1.25) rotate(-5deg);
}

/* ----------------------------------------------------
   Tab Navigation & Page Views
   ---------------------------------------------------- */
.tab-content {
    display: none;
    flex: 1;
    padding: 16px;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
    overflow-x: hidden;
}
.tab-content.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ----------------------------------------------------
   Unit / Day Path View (Duolingo-style tree)
   ---------------------------------------------------- */
.unit-banner {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px 18px;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 6px 16px rgba(88, 204, 2, 0.25);
}
.unit-info h2 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 4px;
}
.unit-info p {
    font-size: 13px;
    opacity: 0.92;
    line-height: 1.35;
}

.path-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
    padding: 10px 0 30px 0;
    position: relative;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* Node positions for curved path illusion */
.path-node-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    margin-bottom: 24px;
    transition: transform 0.2s ease;
}
.path-node-wrapper:nth-child(even) { transform: translateX(35px); }
.path-node-wrapper:nth-child(3n+1) { transform: translateX(-35px); }
.path-node-wrapper:nth-child(3n) { transform: translateX(0); }

.path-circle {
    width: 76px;
    height: 76px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    box-shadow: 0 6px 0 var(--primary-dark);
    color: white;
    cursor: pointer;
    position: relative;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    user-select: none;
}
.path-circle:active {
    transform: translateY(4px);
    box-shadow: 0 2px 0 var(--primary-dark);
}

.path-circle.locked {
    background-color: #e5e5e5;
    box-shadow: 0 6px 0 #cccccc;
    color: #afafaf;
    cursor: not-allowed;
}
.path-circle.locked:active {
    transform: none;
    box-shadow: 0 6px 0 #cccccc;
}

.path-circle.completed {
    background-color: var(--yellow);
    box-shadow: 0 6px 0 #d9a300;
}
.path-circle.completed:active {
    box-shadow: 0 2px 0 #d9a300;
}

.path-circle .day-num {
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.path-circle .day-icon {
    font-size: 26px;
    line-height: 1;
    margin-top: 2px;
}

.path-stars {
    position: absolute;
    bottom: -10px;
    background: #ffffff;
    border: 2px solid var(--gray-border);
    padding: 1px 6px;
    border-radius: var(--radius-pill);
    font-size: 11px;
    color: var(--yellow);
    font-weight: 800;
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
}

.path-node-label {
    margin-top: 10px;
    font-size: 13px;
    font-weight: 800;
    color: var(--dark-text);
    text-align: center;
    max-width: 140px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Gift chest indicator */
.gift-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--orange);
    color: white;
    font-size: 12px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 0 var(--orange-dark);
}

/* ----------------------------------------------------
   Exercise Runner (Interactive Duolingo Engine)
   ---------------------------------------------------- */
#exercise-runner-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--surface);
    z-index: 1000;
    flex-direction: column;
}
#exercise-runner-modal.active {
    display: flex;
}

.runner-top-bar {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--gray-border);
}

.close-runner-btn {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--gray-text);
    cursor: pointer;
    line-height: 1;
    padding: 4px;
    border-radius: 50%;
}
.close-runner-btn:hover {
    color: var(--dark-text);
    background-color: var(--gray-light);
}

/* Curved Progress Bar */
.runner-progress-track {
    flex: 1;
    height: 16px;
    background-color: var(--gray-light);
    border-radius: var(--radius-pill);
    overflow: hidden;
    position: relative;
}

.runner-progress-fill {
    height: 100%;
    width: 0%;
    background-color: var(--primary);
    border-radius: var(--radius-pill);
    transition: width 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
}
.runner-progress-fill::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 6px;
    right: 6px;
    height: 4px;
    background: rgba(255, 255, 255, 0.45);
    border-radius: var(--radius-pill);
}

.runner-hearts {
    font-weight: 800;
    color: var(--red);
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 16px;
}

.runner-body {
    flex: 1;
    padding: 24px 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    max-width: var(--app-max-width);
    margin: 0 auto;
    width: 100%;
}

.exercise-question-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 20px;
    line-height: 1.3;
}

/* Audio Dictation Speaker Card */
.audio-speaker-card {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.big-speaker-btn {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background-color: var(--blue);
    box-shadow: 0 5px 0 var(--blue-dark);
    color: white;
    font-size: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.big-speaker-btn:active {
    transform: translateY(3px);
    box-shadow: 0 2px 0 var(--blue-dark);
}

.turtle-speaker-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--yellow);
    box-shadow: 0 4px 0 #cca000;
    color: white;
    font-size: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
}
.turtle-speaker-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 #cca000;
}

/* MCQ Options Grid */
.mcq-options-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 10px;
}

.mcq-card {
    background-color: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-3d) var(--gray-border);
    padding: 16px 18px;
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: all 0.1s ease;
    user-select: none;
}
.mcq-card:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--gray-border);
}

.mcq-card.selected {
    border-color: var(--blue);
    background-color: var(--blue-light);
    color: var(--blue-dark);
    box-shadow: var(--shadow-3d) var(--blue);
}

.mcq-card .key-badge {
    width: 28px;
    height: 28px;
    border: 2px solid var(--gray-border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 800;
    color: var(--gray-text);
}
.mcq-card.selected .key-badge {
    border-color: var(--blue);
    color: var(--blue);
    background: #ffffff;
}

/* Fill-in-the-gaps Input & German Characters */
.fill-gap-container {
    margin-top: 14px;
}
.gap-input {
    width: 100%;
    padding: 16px;
    font-size: 18px;
    font-weight: 700;
    font-family: var(--font-stack);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    outline: none;
    background-color: var(--surface);
    color: var(--dark-text);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.03);
    transition: border-color 0.15s ease;
}
.gap-input:focus {
    border-color: var(--blue);
}

/* German Umlaut Bar */
.german-char-bar {
    display: flex;
    gap: 8px;
    margin-top: 14px;
    flex-wrap: wrap;
}
.char-btn {
    flex: 1;
    min-width: 38px;
    padding: 8px 0;
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-sm);
    box-shadow: 0 3px 0 var(--gray-border);
    background: var(--surface);
    font-weight: 800;
    font-size: 16px;
    cursor: pointer;
    text-align: center;
    transition: all 0.1s ease;
}
.char-btn:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--gray-border);
    background: var(--gray-light);
}

/* Left-to-Right Matching Pairs */
.matching-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 10px;
}

.matching-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.matching-card {
    background-color: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-3d) var(--gray-border);
    padding: 14px 12px;
    font-size: 14px;
    font-weight: 700;
    text-align: center;
    cursor: pointer;
    transition: all 0.12s ease;
    user-select: none;
    min-height: 54px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.matching-card:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--gray-border);
}

.matching-card.selected {
    border-color: var(--blue);
    background-color: var(--blue-light);
    color: var(--blue-dark);
    box-shadow: var(--shadow-3d) var(--blue);
}

.matching-card.matched {
    border-color: #a5d6a7;
    background-color: #e8f5e9;
    color: #a5d6a7;
    box-shadow: none;
    cursor: default;
    opacity: 0.6;
    transform: scale(0.98);
}

.matching-card.mismatch {
    animation: shake 0.35s ease-in-out;
    border-color: var(--red);
    background-color: var(--red-light);
    color: var(--red-dark);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}

/* Runner Bottom Action Bar */
.runner-footer {
    padding: 16px 20px;
    border-top: 2px solid var(--gray-border);
    background: var(--surface);
    max-width: var(--app-max-width);
    margin: 0 auto;
    width: 100%;
}

/* ----------------------------------------------------
   Instant Feedback Bottom Drawer (Duolingo style slide-up)
   ---------------------------------------------------- */
.feedback-drawer {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    z-index: 1100;
    padding: 20px;
    box-shadow: 0 -8px 24px rgba(0,0,0,0.12);
    animation: slideUp 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.feedback-drawer.active {
    display: block;
}

@keyframes slideUp {
    from { transform: translateY(100%); }
    to { transform: translateY(0); }
}

.feedback-inner {
    max-width: var(--app-max-width);
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feedback-header {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.feedback-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: white;
    flex-shrink: 0;
}

.feedback-text h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 4px;
}
.feedback-text p {
    font-size: 14px;
    font-weight: 600;
    line-height: 1.4;
}

/* Correct state */
.feedback-drawer.correct {
    background-color: var(--primary-light);
    color: #1b5e20;
}
.feedback-drawer.correct .feedback-icon {
    background-color: var(--primary);
}

/* Incorrect state */
.feedback-drawer.incorrect {
    background-color: var(--red-light);
    color: #b71c1c;
}
.feedback-drawer.incorrect .feedback-icon {
    background-color: var(--red);
}

.explanation-box {
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 600;
    margin-top: 6px;
    border-left: 3px solid currentColor;
}

/* ----------------------------------------------------
   Post-Lesson Celebration & Reward Screen
   ---------------------------------------------------- */
.reward-modal-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.65);
    z-index: 1200;
    align-items: center;
    justify-content: center;
    padding: 16px;
}
.reward-modal-backdrop.active {
    display: flex;
    animation: fadeIn 0.25s ease;
}

.reward-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 440px;
    max-height: 92vh;
    overflow-y: auto;
    padding: 28px 24px;
    text-align: center;
    box-shadow: 0 16px 36px rgba(0,0,0,0.2);
    position: relative;
    animation: popUp 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes popUp {
    from { transform: scale(0.85); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.reward-trophy {
    font-size: 64px;
    margin-bottom: 8px;
    animation: bounce 0.6s ease infinite alternate;
}

@keyframes bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-8px); }
}

.reward-card h2 {
    font-size: 24px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 4px;
}
.reward-card p.subtitle {
    font-size: 14px;
    color: var(--gray-text);
    margin-bottom: 20px;
}

/* Stat Rewards Grid */
.rewards-metrics-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.metric-box {
    background-color: var(--gray-light);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    padding: 12px 6px;
}
.metric-box .metric-icon {
    font-size: 20px;
}
.metric-box .metric-val {
    font-size: 16px;
    font-weight: 800;
    color: var(--dark-text);
    margin: 2px 0;
}
.metric-box .metric-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--gray-text);
    text-transform: uppercase;
}

/* Unlocked Lesson Gifts Section */
.gifts-unlock-container {
    background: #f0fdf4;
    border: 2px dashed var(--primary);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 20px;
    text-align: left;
}
.gifts-unlock-title {
    font-size: 14px;
    font-weight: 800;
    color: #166534;
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 10px;
}
.gift-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.gift-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #ffffff;
    border: 2px solid #bbf7d0;
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    font-size: 13px;
    font-weight: 700;
    color: #15803d;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
}
.gift-btn:hover {
    background: #dcfce7;
    border-color: var(--primary);
}

/* ----------------------------------------------------
   Leaderboard View
   ---------------------------------------------------- */
.leaderboard-header {
    text-align: center;
    margin-bottom: 20px;
}
.leaderboard-header h2 {
    font-size: 22px;
    font-weight: 800;
}
.leaderboard-header p {
    font-size: 13px;
    color: var(--gray-text);
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.leaderboard-row {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    gap: 12px;
    transition: transform 0.1s ease;
}
.leaderboard-row.is-me {
    border-color: var(--primary);
    background-color: var(--primary-light);
    box-shadow: 0 4px 12px rgba(88, 204, 2, 0.15);
}

.rank-badge {
    width: 28px;
    font-weight: 800;
    font-size: 16px;
    text-align: center;
    color: var(--gray-text);
}
.rank-badge.gold { color: #f59e0b; font-size: 20px; }
.rank-badge.silver { color: #94a3b8; font-size: 18px; }
.rank-badge.bronze { color: #b45309; font-size: 18px; }

.player-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border: 2px solid var(--gray-border);
}

.player-info {
    flex: 1;
}
.player-name {
    font-weight: 800;
    font-size: 15px;
    display: flex;
    align-items: center;
    gap: 6px;
}
.player-meta {
    font-size: 12px;
    color: var(--gray-text);
    display: flex;
    gap: 8px;
    margin-top: 2px;
}

.player-xp {
    font-weight: 800;
    font-size: 15px;
    color: var(--orange);
}

/* ----------------------------------------------------
   Community Forum View
   ---------------------------------------------------- */
.forum-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    gap: 10px;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    min-width: 0;
}
.forum-header h2 {
    font-size: 20px;
    font-weight: 800;
    margin: 0;
    min-width: 0;
}
.forum-header .btn-primary {
    white-space: nowrap;
    flex-shrink: 0;
}

.level-filter-chips {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 8px;
    margin-bottom: 16px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    width: 100%;
    max-width: 100%;
    min-width: 0;
    box-sizing: border-box;
}
.level-filter-chips::-webkit-scrollbar { display: none; }

.chip {
    padding: 6px 14px;
    border-radius: var(--radius-pill);
    border: 2px solid var(--gray-border);
    font-size: 13px;
    font-weight: 700;
    background: var(--surface);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s ease;
    flex-shrink: 0;
}
.chip.active {
    background: var(--dark-text);
    color: var(--surface);
    border-color: var(--dark-text);
}

.forum-topic-card {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: transform 0.1s ease, border-color 0.15s ease;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    min-width: 0;
    word-break: break-word;
    overflow-wrap: break-word;
}
.forum-topic-card:hover {
    border-color: var(--blue);
}

.topic-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 12px;
    color: var(--gray-text);
    margin-bottom: 8px;
    flex-wrap: wrap;
    gap: 4px;
}

.level-tag {
    background: #e0f2fe;
    color: #0369a1;
    font-weight: 800;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: var(--radius-pill);
    flex-shrink: 0;
}

.topic-title {
    font-size: 16px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 6px;
    line-height: 1.35;
    word-break: break-word;
    overflow-wrap: break-word;
}

.topic-excerpt {
    font-size: 13px;
    color: var(--gray-text);
    line-height: 1.4;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    overflow-wrap: break-word;
}

.topic-footer {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 13px;
    font-weight: 700;
    color: var(--gray-text);
}
.topic-footer .action-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
    font-size: inherit;
    font-weight: inherit;
    color: inherit;
}
.topic-footer .action-btn.upvoted {
    color: var(--orange);
}

/* ----------------------------------------------------
   Profile View
   ---------------------------------------------------- */
.profile-card {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    text-align: center;
    margin-bottom: 20px;
}
.profile-avatar-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 12px;
    background: var(--blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 38px;
    border: 3px solid var(--blue);
}
.profile-username {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 4px;
}
.profile-role-badge {
    display: inline-block;
    padding: 2px 10px;
    background: var(--gray-light);
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 700;
    color: var(--gray-text);
}

.profile-stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}
.profile-stat-box {
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    padding: 14px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.profile-stat-icon {
    font-size: 28px;
}
.profile-stat-value {
    font-size: 18px;
    font-weight: 800;
}
.profile-stat-label {
    font-size: 12px;
    color: var(--gray-text);
    font-weight: 600;
}

/* ----------------------------------------------------
   Bottom Mobile Navigation Bar
   ---------------------------------------------------- */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--app-max-width);
    height: calc(70px + env(safe-area-inset-bottom, 0px));
    background-color: var(--surface);
    border-top: 2px solid var(--gray-border);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 90;
    padding: 0 10px env(safe-area-inset-bottom, 0px) 10px;
    box-sizing: border-box;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    text-decoration: none;
    color: var(--gray-text);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: var(--radius-md);
    transition: color 0.15s ease, transform 0.1s ease;
    user-select: none;
}
.nav-item:active { transform: scale(0.92); }

.nav-item .nav-icon {
    font-size: 22px;
    line-height: 1;
}
.nav-item .nav-label {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}
.nav-item.active {
    color: var(--primary);
}

/* ----------------------------------------------------
   Generic Modal Dialogs (Auth, Level Select, Video, Forum)
   ---------------------------------------------------- */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    z-index: 1050;
    align-items: center;
    justify-content: center;
    padding: 16px;
}
.modal-overlay.active {
    display: flex;
    animation: fadeIn 0.2s ease;
}

.modal-window {
    background: var(--surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 440px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.25);
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
    animation: popUp 0.25s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.modal-title {
    font-size: 20px;
    font-weight: 800;
}
.modal-close-btn {
    background: none;
    border: none;
    font-size: 22px;
    color: var(--gray-text);
    cursor: pointer;
}

.form-group {
    margin-bottom: 16px;
    text-align: left;
}
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 6px;
}
.form-input {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s ease;
    background: var(--surface);
    color: var(--dark-text);
}
.form-input:focus {
    border-color: var(--blue);
}

/* Responsive Iframe for Video Gifts */
.video-responsive-wrap {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: #000000;
    margin-bottom: 16px;
}
.video-responsive-wrap iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

/* ----------------------------------------------------
   Word Bank Tiles (Duolingo Sentence Builder)
   ---------------------------------------------------- */
.word-tile-btn {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 0 var(--gray-border);
    padding: 10px 18px;
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-text);
    cursor: pointer;
    user-select: none;
    transition: transform 0.08s ease, box-shadow 0.08s ease, border-color 0.1s ease;
    outline: none;
}
.word-tile-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 var(--gray-border);
}
.word-tile-btn.in-tray {
    border-color: var(--blue);
    background-color: var(--blue-light);
    color: var(--blue-dark);
    box-shadow: 0 4px 0 var(--blue);
}

/* ----------------------------------------------------
   Desktop Enhancements (Side Quests & Widgets)
   ---------------------------------------------------- */
#desktop-side-panel {
    display: none;
}

@media (min-width: 900px) {
    body {
        background-color: #f0f4f7;
        padding: 24px 0;
    }
    body.dark-mode {
        background-color: #0b1317;
    }
    #main-layout-wrapper {
        display: flex;
        gap: 30px;
        max-width: 960px;
        width: 100%;
        margin: 0 auto;
        align-items: flex-start;
    }
    #app-shell {
        border-radius: var(--radius-lg);
        border: 2px solid var(--gray-border);
    }
    #desktop-side-panel {
        display: flex;
        flex-direction: column;
        gap: 20px;
        width: 360px;
        flex-shrink: 0;
    }
    .side-widget {
        background: var(--surface);
        border: 2px solid var(--gray-border);
        border-radius: var(--radius-lg);
        padding: 20px;
        box-shadow: 0 4px 14px rgba(0,0,0,0.04);
    }
    .side-widget-title {
        font-size: 16px;
        font-weight: 800;
        margin-bottom: 12px;
        display: flex;
        align-items: center;
        gap: 8px;
    }
    .quest-item {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 0;
        border-bottom: 1px solid var(--gray-border);
    }
    .quest-item:last-child {
        border-bottom: none;
    }
    .quest-icon {
        font-size: 26px;
    }
    .quest-details {
        flex: 1;
    }
    .quest-name {
        font-size: 13px;
        font-weight: 700;
        color: var(--dark-text);
        margin-bottom: 4px;
    }
    .quest-bar {
        height: 8px;
        background: var(--gray-light);
        border-radius: var(--radius-pill);
        overflow: hidden;
    }
    .quest-fill {
        height: 100%;
        background: var(--orange);
        border-radius: var(--radius-pill);
        transition: width 0.3s ease;
    }
}

/* ----------------------------------------------------
   Mobile Viewport Fine-Tuning (< 560px, < 440px & < 360px)
   Prevents any horizontal overflow on small phones
   ---------------------------------------------------- */
@media (max-width: 560px) {
    .voice-picker-pill .voice-persona-short {
        display: none !important;
    }
    .voice-picker-pill {
        padding: 4px 7px;
    }
    .top-header {
        padding: 7px 10px;
        gap: 6px;
    }
    .header-group {
        gap: 5px;
    }
}

@media (max-width: 440px) {
    .forum-header {
        flex-wrap: wrap;
        gap: 10px;
    }
    .forum-header h2 {
        font-size: 18px;
    }
    .forum-header .btn-primary {
        font-size: 12px;
        padding: 7px 12px;
    }
    .top-header {
        padding: 6px 8px;
        gap: 4px;
    }
    .header-left-group {
        gap: 4px;
    }
    .header-right-group {
        gap: 5px;
    }
    .header-stats {
        gap: 5px;
    }
    .level-picker-pill {
        padding: 3px 6px;
        font-size: 11px;
        gap: 2px;
    }
    .level-picker-pill .flag-icon {
        font-size: 13px;
    }
    .lang-switcher-pill {
        padding: 1.5px;
        gap: 1px;
    }
    .lang-btn {
        padding: 2px 5px;
        font-size: 10px;
    }
    .voice-picker-pill {
        padding: 3px 6px;
        font-size: 13px;
    }
    .stat-pill {
        font-size: 12px;
        gap: 2px;
    }
    .stat-pill .icon {
        font-size: 13px;
    }
    .auth-header-btn {
        padding: 5px 8px;
        font-size: 11px;
    }
    .auth-header-btn .auth-text {
        display: none !important;
    }
    .auth-header-user-btn {
        padding: 3px 6px;
        font-size: 10px;
        max-width: 76px;
    }
    .modal-window {
        padding: 18px 14px;
    }
    .path-node-wrapper:nth-child(even) { transform: translateX(24px); }
    .path-node-wrapper:nth-child(3n+1) { transform: translateX(-24px); }
}

@media (max-width: 360px) {
    .top-header {
        padding: 5px 6px;
        gap: 2px;
    }
    .header-left-group {
        gap: 2px;
    }
    .header-right-group {
        gap: 3px;
    }
    .header-stats {
        gap: 4px;
    }
    .level-picker-pill {
        padding: 2px 5px;
        font-size: 10px;
    }
    .lang-btn {
        padding: 2px 4px;
        font-size: 9px;
    }
    .stat-pill {
        font-size: 11px;
        gap: 1px;
    }
    .stat-pill .icon {
        font-size: 12px;
    }
    .auth-header-btn {
        padding: 4px 6px;
    }
    .tab-content {
        padding: 10px 8px;
    }
}

/* ----------------------------------------------------
   Learner Authentication & Signup/Login Styling
   ---------------------------------------------------- */
.auth-header-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--primary);
    color: #ffffff;
    font-weight: 800;
    font-size: 11px;
    padding: 5px 9px;
    border-radius: var(--radius-pill);
    border: none;
    box-shadow: 0 2px 0 var(--primary-dark);
    cursor: pointer;
    transition: transform 0.08s ease, box-shadow 0.08s ease;
    white-space: nowrap;
    letter-spacing: 0.2px;
    flex-shrink: 0;
}
.auth-header-btn:active {
    transform: translateY(2px);
    box-shadow: none;
}

.auth-header-user-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--gray-light);
    border: 1.5px solid var(--gray-border);
    border-radius: var(--radius-pill);
    padding: 4px 8px;
    font-size: 11px;
    font-weight: 800;
    color: var(--dark-text);
    cursor: pointer;
    flex-shrink: 0;
    line-height: 1.2;
    white-space: nowrap;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: background 0.15s ease;
}
.auth-header-user-btn:hover {
    background: var(--surface);
    border-color: var(--blue);
}

.auth-tabs {
    display: flex;
    background: var(--gray-light);
    border-radius: var(--radius-md);
    padding: 4px;
    gap: 4px;
    margin-bottom: 20px;
}
.auth-tab-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 800;
    color: var(--gray-text);
    cursor: pointer;
    transition: all 0.15s ease;
}
.auth-tab-btn.active {
    background: var(--surface);
    color: var(--dark-text);
    box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

.auth-alert-error {
    background: #fef2f2;
    border: 1px solid #f87171;
    color: #991b1b;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
    display: none;
}
.auth-alert-error.active {
    display: block;
    animation: fadeIn 0.2s ease;
}

.auth-hero-card {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border: 2px solid #bbf7d0;
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    text-align: center;
    margin-bottom: 24px;
    box-shadow: 0 4px 12px rgba(88, 204, 2, 0.08);
}
body.dark-mode .auth-hero-card {
    background: linear-gradient(135deg, #14532d 0%, #052e16 100%);
    border-color: #166534;
}
.auth-hero-mascot {
    font-size: 48px;
    line-height: 1;
    margin-bottom: 10px;
}
.auth-hero-title {
    font-size: 20px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 6px;
}
.auth-hero-desc {
    font-size: 13px;
    color: var(--gray-text);
    line-height: 1.5;
    margin-bottom: 18px;
}

.auth-footer-switcher {
    text-align: center;
    margin-top: 18px;
    font-size: 13px;
    color: var(--gray-text);
}
.auth-footer-switcher a {
    color: var(--blue);
    font-weight: 700;
    text-decoration: none;
}
.auth-footer-switcher a:hover {
    text-decoration: underline;
}

/* ========================================================
   ENHANCEMENT SUITE STYLES: MIC, SHOP, SRS, LEAGUES
   ======================================================== */

/* 1. Microphone Pulse Button (Speaking Drill) */
.mic-pulse-btn {
    width: 84px;
    height: 84px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--blue) 0%, var(--blue-dark) 100%);
    border: none;
    font-size: 36px;
    cursor: pointer;
    box-shadow: 0 6px 0 var(--blue-dark), 0 10px 20px rgba(28, 176, 246, 0.3);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    position: relative;
    user-select: none;
}
.mic-pulse-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 0 var(--blue-dark), 0 14px 25px rgba(28, 176, 246, 0.4);
}
.mic-pulse-btn:active {
    transform: translateY(4px);
    box-shadow: 0 2px 0 var(--blue-dark);
}
.mic-pulse-btn.recording {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 6px 0 #b91c1c, 0 0 0 10px rgba(239, 68, 68, 0.25);
    animation: micPulse 1.2s infinite alternate;
}
@keyframes micPulse {
    0% { transform: scale(1); box-shadow: 0 6px 0 #b91c1c, 0 0 0 6px rgba(239, 68, 68, 0.2); }
    100% { transform: scale(1.08); box-shadow: 0 6px 0 #b91c1c, 0 0 0 16px rgba(239, 68, 68, 0.35); }
}

/* 2. SRS Spaced Repetition Banner Widget */
.srs-banner-card {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 2px solid #93c5fd;
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    margin: 16px 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 4px 14px rgba(59, 130, 246, 0.1);
    transition: transform 0.18s ease;
}
body.dark-mode .srs-banner-card {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-color: #3b82f6;
}
.srs-banner-card:hover {
    transform: translateY(-2px);
}
.srs-banner-icon {
    font-size: 32px;
    line-height: 1;
    margin-right: 14px;
    flex-shrink: 0;
}
.srs-banner-title {
    font-size: 15px;
    font-weight: 800;
    color: #1e3a8a;
    margin-bottom: 2px;
}
body.dark-mode .srs-banner-title {
    color: #93c5fd;
}
.srs-banner-sub {
    font-size: 12px;
    color: #3b82f6;
    font-weight: 600;
}
body.dark-mode .srs-banner-sub {
    color: #cbd5e1;
}

/* 3. Gem Shop & Rewards Marketplace Cards */
.shop-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    margin-top: 14px;
}
.shop-card {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    transition: all 0.15s ease;
}
.shop-card:hover {
    border-color: var(--blue);
    box-shadow: 0 4px 12px rgba(28, 176, 246, 0.12);
}
.shop-card-left {
    display: flex;
    align-items: center;
    gap: 14px;
}
.shop-card-icon {
    font-size: 34px;
    line-height: 1;
    flex-shrink: 0;
}
.shop-card-title {
    font-size: 14px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 2px;
}
.shop-card-desc {
    font-size: 12px;
    color: var(--gray-text);
    line-height: 1.35;
}

/* 4. Leagues & Divisions Banner */
.league-hero-card {
    background: linear-gradient(135deg, #fefce8 0%, #fef08a 100%);
    border: 2px solid #fde047;
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
body.dark-mode .league-hero-card {
    background: linear-gradient(135deg, #422006 0%, #292524 100%);
    border-color: #ca8a04;
}
.league-pill-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: var(--radius-pill);
    text-transform: uppercase;
}
.zone-promo { background: #dcfce7; color: #15803d; }
.zone-demo { background: #fee2e2; color: #b91c1c; }

/* ----------------------------------------------------
   5. Duolingo-Grade 7-Day Streak Milestone Unit Banners
   ---------------------------------------------------- */
.streak-unit-card {
    width: 100%;
    max-width: 100%;
    align-self: stretch;
    border-radius: 16px;
    padding: 14px 18px;
    margin: 6px 0 24px 0;
    box-sizing: border-box;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    user-select: none;
    transform: none !important; /* Never inherit path node curve transforms */
}
.streak-unit-card:hover {
    transform: translateY(-2px) !important;
}

/* Tier 1: Wildfire (Days 1–7) - Warm Orange Glow */
.streak-unit-card.streak-theme-wildfire {
    background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
    border: 2px solid #fdba74;
    box-shadow: 0 4px 0 #ea580c, 0 10px 20px rgba(234, 88, 12, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-wildfire {
    background: linear-gradient(135deg, #431407 0%, #291004 100%);
    border-color: #ea580c;
    box-shadow: 0 4px 0 #9a3412;
}

/* Tier 2: Blazing Star (Days 8–14) - Electric Blue / Cyan */
.streak-unit-card.streak-theme-blazing {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 2px solid #7dd3fc;
    box-shadow: 0 4px 0 #0284c7, 0 10px 20px rgba(2, 132, 199, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-blazing {
    background: linear-gradient(135deg, #082f49 0%, #0c1f2d 100%);
    border-color: #0284c7;
    box-shadow: 0 4px 0 #0369a1;
}

/* Tier 3: Inferno Titan (Days 15–21) - Mystic Purple Flame */
.streak-unit-card.streak-theme-inferno {
    background: linear-gradient(135deg, #faf5ff 0%, #f3e8ff 100%);
    border: 2px solid #d8b4fe;
    box-shadow: 0 4px 0 #9333ea, 0 10px 20px rgba(147, 51, 234, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-inferno {
    background: linear-gradient(135deg, #3b0764 0%, #24073d 100%);
    border-color: #9333ea;
    box-shadow: 0 4px 0 #7e22ce;
}

/* Tier 4: Supernova Champion (Days 22–28) - Royal Golden Amber */
.streak-unit-card.streak-theme-supernova {
    background: linear-gradient(135deg, #fefce8 0%, #fef08a 100%);
    border: 2px solid #facc15;
    box-shadow: 0 4px 0 #ca8a04, 0 10px 20px rgba(202, 138, 4, 0.12);
}
body.dark-mode .streak-unit-card.streak-theme-supernova {
    background: linear-gradient(135deg, #422006 0%, #291503 100%);
    border-color: #ca8a04;
    box-shadow: 0 4px 0 #a16207;
}

/* Tier 5: Cosmic Blaze (Days 29–35) - Emerald Mint Glow */
.streak-unit-card.streak-theme-cosmic {
    background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
    border: 2px solid #6ee7b7;
    box-shadow: 0 4px 0 #059669, 0 10px 20px rgba(5, 150, 105, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-cosmic {
    background: linear-gradient(135deg, #064e3b 0%, #022c22 100%);
    border-color: #059669;
    box-shadow: 0 4px 0 #047857;
}

/* Tier 6: Thunder Phoenix (Days 36–42) - Crimson Ember Flame */
.streak-unit-card.streak-theme-phoenix {
    background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
    border: 2px solid #fda4af;
    box-shadow: 0 4px 0 #e11d48, 0 10px 20px rgba(225, 29, 72, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-phoenix {
    background: linear-gradient(135deg, #4c0519 0%, #29030e 100%);
    border-color: #e11d48;
    box-shadow: 0 4px 0 #be123c;
}

/* Tier 7: Aurora Vanguard (Days 43–49) - Teal Polar Borealis */
.streak-unit-card.streak-theme-aurora {
    background: linear-gradient(135deg, #f0fdfa 0%, #ccfbf1 100%);
    border: 2px solid #5eead4;
    box-shadow: 0 4px 0 #0d9488, 0 10px 20px rgba(13, 148, 136, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-aurora {
    background: linear-gradient(135deg, #134e4a 0%, #042f2e 100%);
    border-color: #0d9488;
    box-shadow: 0 4px 0 #0f766e;
}

/* Tier 8: Solar Flare (Days 50–56) - Coral Sunset Radiance */
.streak-unit-card.streak-theme-solar {
    background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
    border: 2px solid #fb923c;
    box-shadow: 0 4px 0 #c2410c, 0 10px 20px rgba(194, 65, 12, 0.1);
}
body.dark-mode .streak-unit-card.streak-theme-solar {
    background: linear-gradient(135deg, #431407 0%, #270e04 100%);
    border-color: #c2410c;
    box-shadow: 0 4px 0 #9a3412;
}

/* Tier 9: Hören Master (Days 57–63) - Deep Indigo Soundwave */
.streak-unit-card.streak-theme-hoeren {
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
    border: 2px solid #a5b4fc;
    box-shadow: 0 4px 0 #4f46e5, 0 10px 20px rgba(79, 70, 229, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-hoeren {
    background: linear-gradient(135deg, #1e1b4b 0%, #0f1035 100%);
    border-color: #4f46e5;
    box-shadow: 0 4px 0 #4338ca;
}

/* Tier 10: Lesen Champion (Days 64–70) - Sapphire Ocean Book */
.streak-unit-card.streak-theme-lesen {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 2px solid #93c5fd;
    box-shadow: 0 4px 0 #2563eb, 0 10px 20px rgba(37, 99, 235, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-lesen {
    background: linear-gradient(135deg, #172554 0%, #08112e 100%);
    border-color: #2563eb;
    box-shadow: 0 4px 0 #1d4ed8;
}

/* Tier 11: Schreiben Champion (Days 71–77) - Amber Quill Gold */
.streak-unit-card.streak-theme-schreiben {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    border: 2px solid #fcd34d;
    box-shadow: 0 4px 0 #d97706, 0 10px 20px rgba(217, 119, 6, 0.1);
}
body.dark-mode .streak-unit-card.streak-theme-schreiben {
    background: linear-gradient(135deg, #451a03 0%, #291102 100%);
    border-color: #d97706;
    box-shadow: 0 4px 0 #b45309;
}

/* Tier 12: Sprechen Master (Days 78–84) - Fuchsia Voice Vibrance */
.streak-unit-card.streak-theme-sprechen {
    background: linear-gradient(135deg, #fdf4ff 0%, #fae8ff 100%);
    border: 2px solid #f0abfc;
    box-shadow: 0 4px 0 #c026d3, 0 10px 20px rgba(192, 38, 211, 0.08);
}
body.dark-mode .streak-unit-card.streak-theme-sprechen {
    background: linear-gradient(135deg, #4a044e 0%, #2b022d 100%);
    border-color: #c026d3;
    box-shadow: 0 4px 0 #a21caf;
}

/* Tier 13: Goethe Grandmaster (Days 85–90) - Diamond Hologram & Crown */
.streak-unit-card.streak-theme-grandmaster {
    background: linear-gradient(135deg, #faf5ff 0%, #fef08a 50%, #eff6ff 100%);
    border: 3px solid #eab308;
    box-shadow: 0 6px 0 #ca8a04, 0 15px 30px rgba(234, 179, 8, 0.2);
}
body.dark-mode .streak-unit-card.streak-theme-grandmaster {
    background: linear-gradient(135deg, #3b0764 0%, #422006 50%, #172554 100%);
    border-color: #eab308;
    box-shadow: 0 6px 0 #a16207;
}

.streak-unit-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 8px;
    gap: 8px;
}
.streak-unit-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    background: rgba(255, 255, 255, 0.92);
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    color: var(--dark-text);
    border: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}
body.dark-mode .streak-unit-badge-pill {
    background: rgba(0, 0, 0, 0.45);
    color: #f1f5f9;
    border-color: rgba(255, 255, 255, 0.1);
}
.streak-unit-badge-pill .badge-icon {
    font-size: 14px;
    line-height: 1;
}
.streak-unit-tap-hint {
    font-size: 11.5px;
    font-weight: 800;
    color: #ea580c;
    background: rgba(255, 255, 255, 0.75);
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    transition: transform 0.12s ease;
}
.streak-unit-card:hover .streak-unit-tap-hint {
    transform: translateX(2px);
}
body.dark-mode .streak-unit-tap-hint {
    color: #fb923c;
    background: rgba(0, 0, 0, 0.35);
}
.streak-unit-title {
    font-size: 16.5px;
    font-weight: 900;
    color: var(--dark-text);
    margin: 4px 0 3px 0;
    line-height: 1.3;
    letter-spacing: -0.2px;
}
body.dark-mode .streak-unit-title {
    color: #f8fafc;
}
.streak-unit-motto {
    font-size: 12.5px;
    color: var(--gray-text);
    font-weight: 600;
    line-height: 1.4;
    margin: 0;
}
body.dark-mode .streak-unit-motto {
    color: #94a3b8;
}

/* ----------------------------------------------------
   6. Milestone Nodes (Day 7, 14, 21, 30 Streak Milestones)
   ---------------------------------------------------- */
.path-circle.milestone-circle {
    width: 82px;
    height: 82px;
    border: 3px solid #ffc800;
    box-shadow: 0 6px 0 #d9a300, 0 0 16px rgba(255, 200, 0, 0.35);
}
.path-circle.milestone-circle.completed {
    background: linear-gradient(135deg, #ffd700 0%, #ff9600 100%);
    box-shadow: 0 6px 0 #c26900, 0 0 20px rgba(255, 150, 0, 0.45);
}
.milestone-crown-badge {
    position: absolute;
    top: -12px;
    font-size: 20px;
    line-height: 1;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.25));
    animation: crownFloat 2s ease-in-out infinite alternate;
}
@keyframes crownFloat {
    0% { transform: translateY(0); }
    100% { transform: translateY(-4px); }
}
.milestone-pill-tag {
    margin-top: 6px;
    font-size: 10px;
    font-weight: 800;
    color: #9a3412;
    background: #ffedd5;
    border: 1px solid #fed7aa;
    border-radius: var(--radius-pill);
    padding: 2px 8px;
    white-space: nowrap;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
body.dark-mode .milestone-pill-tag {
    background: #431407;
    border-color: #ea580c;
    color: #fdba74;
}

/* ----------------------------------------------------
   7. Duolingo Streak Society Modal Dialog
   ---------------------------------------------------- */
.streak-modal-window {
    max-width: 420px;
    padding: 24px 20px;
    text-align: center;
}
.streak-modal-hero {
    position: relative;
    padding-bottom: 10px;
}
.streak-modal-close {
    position: absolute;
    top: -8px;
    right: -4px;
    background: none;
    border: none;
    font-size: 22px;
    color: var(--gray-text);
    cursor: pointer;
    padding: 6px;
    line-height: 1;
}
.streak-flame-wrapper {
    position: relative;
    width: 76px;
    height: 76px;
    margin: 0 auto 8px auto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.streak-flame-glow {
    position: absolute;
    width: 68px;
    height: 68px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255, 150, 0, 0.45) 0%, rgba(255, 75, 75, 0) 70%);
    animation: flamePulse 1.8s ease-in-out infinite;
}
@keyframes flamePulse {
    0%, 100% { transform: scale(0.9); opacity: 0.6; }
    50% { transform: scale(1.3); opacity: 1; }
}
.streak-flame-icon {
    font-size: 44px;
    position: relative;
    z-index: 2;
    line-height: 1;
}
.streak-hero-count {
    font-size: 40px;
    font-weight: 900;
    color: var(--orange);
    line-height: 1;
    margin-bottom: 2px;
    letter-spacing: -1px;
}
.streak-hero-label {
    font-size: 14px;
    font-weight: 800;
    color: var(--dark-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}
.streak-hero-sub {
    font-size: 12px;
    color: var(--gray-text);
    line-height: 1.4;
    max-width: 320px;
    margin: 0 auto 12px auto;
}

/* Weekly Streak Calendar */
.streak-calendar-card {
    background: var(--gray-light);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    margin-bottom: 14px;
    border: 1.5px solid var(--gray-border);
}
.streak-calendar-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}
.streak-status-pill {
    font-size: 11px;
    font-weight: 800;
    padding: 2px 7px;
    border-radius: var(--radius-pill);
    background: #dcfce7;
    color: #15803d;
}
body.dark-mode .streak-status-pill {
    background: #14532d;
    color: #86efac;
}
.streak-calendar-days {
    display: flex;
    justify-content: space-between;
    gap: 4px;
}
.streak-cal-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex: 1;
}
.streak-cal-day-label {
    font-size: 10px;
    font-weight: 700;
    color: var(--gray-text);
}
.streak-cal-flame {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    background: var(--surface);
    border: 1.5px solid var(--gray-border);
    color: var(--gray-text);
    font-weight: 800;
}
.streak-cal-flame.lit {
    background: #fff7ed;
    border-color: #fdba74;
    color: var(--orange);
    box-shadow: 0 2px 6px rgba(255, 150, 0, 0.2);
}
body.dark-mode .streak-cal-flame.lit {
    background: #431407;
    border-color: #ea580c;
}
.streak-cal-col.current-day .streak-cal-day-label {
    color: var(--orange);
    font-weight: 800;
}
.streak-cal-flame.today {
    border-color: var(--orange);
    box-shadow: 0 0 0 2px var(--orange-light);
}

/* 4 Streak Milestones List */
.streak-tiers-section {
    text-align: left;
    margin-bottom: 14px;
}
.streak-tiers-heading {
    font-size: 12px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.4px;
}
.streak-tiers-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.streak-tier-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-md);
    border: 1.5px solid var(--gray-border);
    background: var(--surface);
    transition: all 0.15s ease;
}
.streak-tier-card.achieved {
    border-color: var(--primary);
    background: #f0fdf4;
}
body.dark-mode .streak-tier-card.achieved {
    background: #052e16;
    border-color: var(--primary);
}
.streak-tier-card.in-progress {
    border-color: var(--orange);
    background: #fff7ed;
}
body.dark-mode .streak-tier-card.in-progress {
    background: #2a1205;
    border-color: var(--orange);
}
.streak-tier-icon-box {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    background: var(--gray-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}
.streak-tier-info {
    flex: 1;
}
.streak-tier-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 6px;
    margin-bottom: 2px;
}
.streak-tier-name {
    font-size: 12px;
    font-weight: 800;
    color: var(--dark-text);
}
.streak-tier-desc {
    font-size: 10.5px;
    color: var(--gray-text);
    line-height: 1.3;
}
.tier-pill-status {
    font-size: 10px;
    font-weight: 800;
    padding: 2px 6px;
    border-radius: var(--radius-pill);
    white-space: nowrap;
}
.tier-pill-status.achieved {
    background: #dcfce7;
    color: #15803d;
}
body.dark-mode .tier-pill-status.achieved {
    background: #14532d;
    color: #86efac;
}
.tier-pill-status.progress {
    background: #ffedd5;
    color: #c2410c;
}
body.dark-mode .tier-pill-status.progress {
    background: #431407;
    color: #fdba74;
}
.tier-pill-status.locked {
    background: var(--gray-light);
    color: var(--gray-text);
}

/* Streak Freeze Protection Card */
.streak-protection-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border: 1.5px solid #bae6fd;
    border-radius: var(--radius-md);
    padding: 9px 12px;
    text-align: left;
}
body.dark-mode .streak-protection-card {
    background: linear-gradient(135deg, #082f49 0%, #0c1f2d 100%);
    border-color: #0284c7;
}
.streak-protection-left {
    display: flex;
    align-items: center;
    gap: 8px;
}
.protection-icon {
    font-size: 22px;
    line-height: 1;
}
.protection-title {
    font-size: 12px;
    font-weight: 800;
    color: #0369a1;
}
body.dark-mode .protection-title {
    color: #7dd3fc;
}
.protection-sub {
    font-size: 10.5px;
    color: #0284c7;
}
body.dark-mode .protection-sub {
    color: #94a3b8;
}

/* ========================================================
   Streamlined Auth & Google Sign-In & Fresh Reset Styling
   ======================================================== */
.btn-google-auth {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: #ffffff;
    border: 2px solid #e5e7eb;
    border-radius: var(--radius-md);
    color: #374151;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 3px 0 #d1d5db;
    transition: all 0.15s ease;
    font-family: inherit;
}
.btn-google-auth:hover {
    background: #f9fafb;
    border-color: #cbd5e1;
}
.btn-google-auth:active {
    transform: translateY(3px);
    box-shadow: 0 0 0 #d1d5db;
}
body.dark-mode .btn-google-auth {
    background: #1e293b;
    border-color: #334155;
    color: #f1f5f9;
    box-shadow: 0 3px 0 #0f172a;
}
.auth-divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 16px 0;
    color: var(--gray-text);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    border-bottom: 1.5px solid var(--gray-border);
}
.auth-divider:not(:empty)::before {
    margin-right: .75em;
}
.auth-divider:not(:empty)::after {
    margin-left: .75em;
}
.btn-warning-soft {
    background: #fff7ed;
    color: #c2410c;
    border: 2px solid #fdba74;
    box-shadow: 0 4px 0 #fed7aa;
}
.btn-warning-soft:hover {
    background: #ffedd5;
}
.btn-warning-soft:active {
    transform: translateY(4px);
    box-shadow: 0 0 0 #fed7aa;
}
body.dark-mode .btn-warning-soft {
    background: #431407;
    color: #fdba74;
    border-color: #9a3412;
    box-shadow: 0 4px 0 #7c2d12;
}
.fresh-start-card {
    border-color: #fed7aa;
    transition: transform 0.2s;
}
body.dark-mode .fresh-start-card {
    background: #1e293b !important;
    border-color: #7c2d12 !important;
}

/* ========================================================
   Topic Audio Button & Runner Topic Banner (Loud & Clear)
   ======================================================== */
.topic-speaker-pill {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    padding: 0;
    margin-left: 6px;
    background: #ffffff;
    border: 1.5px solid #bae6fd;
    border-radius: 50%;
    color: #0284c7;
    font-size: 12px;
    cursor: pointer;
    box-shadow: 0 2px 0 #93c5fd;
    transition: all 0.12s ease;
    vertical-align: middle;
}
.topic-speaker-pill:hover {
    background: #e0f2fe;
    transform: scale(1.15);
}
.topic-speaker-pill:active {
    transform: translateY(2px) scale(0.95);
    box-shadow: 0 0 0 #93c5fd;
}
body.dark-mode .topic-speaker-pill {
    background: #1e293b;
    border-color: #0369a1;
    color: #38bdf8;
    box-shadow: 0 2px 0 #0c4a6e;
}

/* Topic Banner in Exercise Runner Modal */
.runner-topic-header {
    padding: 6px 16px 4px 16px;
    display: flex;
    justify-content: center;
    background: var(--surface);
}
.topic-pill-banner {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #f0fdf4 0%, #e0f2fe 100%);
    border: 1.5px solid #86efac;
    border-radius: var(--radius-pill);
    padding: 5px 14px;
    font-size: 13px;
    font-weight: 800;
    color: #166534;
    cursor: pointer;
    box-shadow: 0 2px 0 rgba(0,0,0,0.06);
    transition: all 0.15s ease;
}
.topic-pill-banner:hover {
    transform: scale(1.02);
    border-color: #4ade80;
    background: linear-gradient(135deg, #dcfce7 0%, #bae6fd 100%);
}
.topic-pill-banner:active {
    transform: translateY(2px);
    box-shadow: none;
}
body.dark-mode .topic-pill-banner {
    background: linear-gradient(135deg, #064e3b 0%, #082f49 100%);
    border-color: #059669;
    color: #a7f3d0;
}
.topic-speaker-icon {
    font-size: 14px;
    display: inline-block;
}

/* ========================================================
   OPTIMIZATION 1: COLLAPSIBLE UNIT CHAPTERS
   ======================================================== */
.units-controls-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    margin-bottom: 12px;
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 2px solid var(--gray-border);
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
}

.units-count-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 800;
    color: var(--dark-text);
}

.units-toggle-all-btn {
    background: transparent;
    border: 1.5px solid var(--gray-border);
    border-radius: var(--radius-pill);
    padding: 5px 12px;
    font-size: 11px;
    font-weight: 800;
    color: var(--blue-dark);
    cursor: pointer;
    transition: all 0.15s ease;
}
.units-toggle-all-btn:hover {
    background: var(--blue-light);
    border-color: var(--blue);
}

/* Unit Chapter Card */
.unit-chapter-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    border: 2px solid var(--gray-border);
    margin-bottom: 22px;
    box-shadow: 0 4px 14px rgba(0,0,0,0.04);
    overflow: hidden;
    transition: box-shadow 0.2s ease;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}
.unit-chapter-card:hover {
    box-shadow: 0 6px 20px rgba(0,0,0,0.07);
}

.unit-chapter-header {
    padding: 18px 20px 14px 20px;
    background: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(248,250,252,0.92) 100%);
    cursor: pointer;
    user-select: none;
    transition: background-color 0.15s ease;
    border-bottom: 1.5px solid var(--gray-border);
    box-sizing: border-box;
    width: 100%;
}
body.dark-mode .unit-chapter-header {
    background: linear-gradient(180deg, #1e2c33 0%, #17242a 100%);
    border-color: #2e3e47;
}
.unit-chapter-header:hover {
    background-color: var(--gray-light);
}

.unit-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.unit-badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: var(--radius-pill);
    font-size: 11.5px;
    font-weight: 800;
    letter-spacing: 0.4px;
    text-transform: uppercase;
    box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}

.unit-header-actions {
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.unit-progress-text {
    font-size: 12px;
    font-weight: 800;
    color: var(--gray-text);
}

.unit-toggle-chevron {
    font-size: 12px;
    font-weight: 800;
    color: var(--gray-text);
    width: 26px;
    height: 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-light);
    border-radius: 50%;
    transition: transform 0.2s ease, background-color 0.15s ease;
}
.unit-chapter-header:hover .unit-toggle-chevron {
    background: var(--gray-border);
    color: var(--dark-text);
}

.unit-chapter-title {
    font-size: 17px;
    font-weight: 900;
    color: var(--dark-text);
    margin-bottom: 5px;
    line-height: 1.3;
}

.unit-chapter-desc {
    font-size: 13px;
    color: var(--gray-text);
    line-height: 1.45;
    margin-bottom: 12px;
}

.unit-mini-progress {
    width: 100%;
    height: 7px;
    background: var(--gray-border);
    border-radius: 4px;
    overflow: hidden;
}

.unit-mini-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.35s ease-out;
}

/* Collapsible Accordion Body */
.unit-chapter-body {
    padding: 16px 18px 28px 18px;
    box-sizing: border-box;
    width: 100%;
}
.unit-chapter-body.collapsed {
    display: none !important;
}
.unit-chapter-body.open {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    animation: fadeInUnit 0.25s ease-out;
}

@keyframes fadeInUnit {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Active Day Pulsing Halo Animation */
.active-day-pulse {
    animation: activeDayGlow 2.2s infinite !important;
}

@keyframes activeDayGlow {
    0% {
        box-shadow: 0 0 0 0 rgba(88, 204, 2, 0.7), 0 6px 0 var(--primary-dark);
    }
    70% {
        box-shadow: 0 0 0 14px rgba(88, 204, 2, 0), 0 6px 0 var(--primary-dark);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(88, 204, 2, 0), 0 6px 0 var(--primary-dark);
    }
}

.active-jump-pulse {
    animation: jumpPop 0.8s ease-out 2 !important;
}

@keyframes jumpPop {
    0% { transform: scale(1); }
    50% { transform: scale(1.12); }
    100% { transform: scale(1); }
}

/* Guide Trigger Button on Node */
.guide-trigger-pill {
    margin-top: 5px;
    background: #e0f2fe;
    color: #0369a1;
    border: 1px solid #bae6fd;
    border-radius: var(--radius-pill);
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    transition: all 0.12s ease;
}
.guide-trigger-pill:hover {
    background: #bae6fd;
    transform: scale(1.05);
}
body.dark-mode .guide-trigger-pill {
    background: #082f49;
    color: #7dd3fc;
    border-color: #0369a1;
}

/* Ad Unlock Trigger Pill on Locked Path Nodes */
.ad-unlock-trigger-pill {
    margin-top: 5px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    border: 1px solid #f59e0b;
    border-radius: var(--radius-pill);
    padding: 2px 8px;
    font-size: 10px;
    font-weight: 800;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(245, 158, 11, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 3px;
    transition: all 0.15s ease;
    white-space: nowrap;
}
.ad-unlock-trigger-pill:hover {
    background: linear-gradient(135deg, #fde68a 0%, #fcd34d 100%);
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 8px rgba(245, 158, 11, 0.35);
}
body.dark-mode .ad-unlock-trigger-pill {
    background: linear-gradient(135deg, #78350f 0%, #92400e 100%);
    color: #fef08a;
    border-color: #d97706;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.5);
}


/* ========================================================
   FLOATING ACTION BUTTON: JUMP TO ACTIVE DAY
   ======================================================== */
.jump-active-fab {
    position: fixed;
    bottom: 85px;
    right: 20px;
    z-index: 80;
    display: none;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: #ffffff;
    font-size: 13px;
    font-weight: 800;
    padding: 10px 16px;
    border-radius: var(--radius-pill);
    border: none;
    box-shadow: 0 4px 12px rgba(88, 204, 2, 0.4), 0 3px 0 var(--primary-dark);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    user-select: none;
}
.jump-active-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(88, 204, 2, 0.5), 0 3px 0 var(--primary-dark);
}
.jump-active-fab:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 var(--primary-dark);
}

/* ========================================================
   TARGETED MISTAKES REVIEW CARD
   ======================================================== */
.mistakes-banner-card {
    background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
    border: 2px solid #fdba74;
    border-radius: var(--radius-lg);
    padding: 14px 16px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    box-shadow: 0 4px 10px rgba(249, 115, 22, 0.08);
}
body.dark-mode .mistakes-banner-card {
    background: linear-gradient(135deg, #431407 0%, #2e1005 100%);
    border-color: #9a3412;
}

.mistakes-banner-icon {
    font-size: 26px;
    flex-shrink: 0;
}

.mistakes-banner-title {
    font-size: 14px;
    font-weight: 800;
    color: #c2410c;
}
body.dark-mode .mistakes-banner-title {
    color: #fdba74;
}

.mistakes-banner-sub {
    font-size: 12px;
    color: #9a3412;
    margin-top: 2px;
    line-height: 1.3;
}
body.dark-mode .mistakes-banner-sub {
    color: #fed7aa;
}

.btn-orange {
    background-color: #ea580c;
    color: #ffffff;
    box-shadow: var(--shadow-3d) #c2410c;
}
.btn-orange:active {
    box-shadow: 0 1px 0 #c2410c;
}

/* ========================================================
   PRE-LESSON GRAMMAR GUIDEBOOK MODAL
   ======================================================== */
.guidebook-modal-window {
    max-width: 480px;
    padding: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.guidebook-hero {
    background: linear-gradient(135deg, #059669 0%, #10b981 100%);
    color: white;
    padding: 22px 20px 18px 20px;
    position: relative;
}

.guidebook-close {
    position: absolute;
    top: 14px;
    right: 14px;
    color: white;
    background: rgba(0,0,0,0.15);
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 14px;
    font-weight: 800;
    transition: background 0.15s ease;
}
.guidebook-close:hover {
    background: rgba(0,0,0,0.3);
}

.guidebook-badge-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.guidebook-day-pill {
    background: rgba(255,255,255,0.25);
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.guidebook-level-pill {
    background: #ffffff;
    color: #047857;
    padding: 3px 10px;
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 900;
}

.guidebook-title {
    font-size: 20px;
    font-weight: 900;
    color: #ffffff;
    margin-bottom: 10px;
    line-height: 1.3;
}

.guidebook-audio-btn {
    background: rgba(255,255,255,0.2);
    border: 1px solid rgba(255,255,255,0.4);
    color: white;
    padding: 5px 12px;
    border-radius: var(--radius-pill);
    font-size: 12px;
    font-weight: 800;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: background 0.15s ease;
}
.guidebook-audio-btn:hover {
    background: rgba(255,255,255,0.35);
}

.guidebook-content {
    padding: 18px 20px;
    max-height: 60vh;
    overflow-y: auto;
}

.guidebook-section {
    margin-bottom: 18px;
}

.guidebook-section-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}
.guidebook-section-header h4 {
    margin: 0;
    font-size: 14px;
    font-weight: 800;
    color: var(--dark-text);
}

.guidebook-grammar-box {
    background: #f0fdf4;
    border: 1.5px solid #bbf7d0;
    border-radius: var(--radius-md);
    padding: 12px 14px;
}
body.dark-mode .guidebook-grammar-box {
    background: #064e3b;
    border-color: #047857;
}

.guidebook-vocab-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 8px;
}

.guidebook-vocab-card {
    background: var(--surface);
    border: 1.5px solid var(--gray-border);
    border-radius: var(--radius-sm);
    padding: 10px 12px;
    cursor: pointer;
    position: relative;
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    transition: all 0.15s ease;
}
.guidebook-vocab-card:hover {
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 3px 8px rgba(0,0,0,0.08);
}

.vocab-card-de {
    font-size: 14px;
    font-weight: 800;
    color: var(--dark-text);
    margin-bottom: 2px;
}

.vocab-card-en {
    font-size: 11px;
    color: var(--gray-text);
    line-height: 1.3;
}

.vocab-speaker-icon {
    position: absolute;
    top: 8px;
    right: 8px;
    font-size: 12px;
    opacity: 0.6;
}

.guidebook-rewards-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 10px 0 0 0;
    border-top: 1px solid var(--gray-border);
}

.guidebook-reward-chip {
    background: var(--gray-light);
    color: var(--dark-text);
    padding: 5px 10px;
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 800;
}

.guidebook-gift-chip {
    background: #fff7ed;
    color: #c2410c;
    border: 1px solid #fed7aa;
    padding: 5px 10px;
    border-radius: var(--radius-pill);
    font-size: 11px;
    font-weight: 800;
}

.guidebook-footer {
    padding: 12px 20px 20px 20px;
    background: var(--surface);
    border-top: 1px solid var(--gray-border);
}

/* ========================================================
   GENDER COLOR HIGHLIGHTS (der = blue, die = red, das = green)
   ======================================================== */
.gender-der {
    color: #2563eb;
    font-weight: 800;
}
.gender-die {
    color: #dc2626;
    font-weight: 800;
}
.gender-das {
    color: #16a34a;
    font-weight: 800;
}

body.dark-mode .gender-der {
    color: #60a5fa;
}
body.dark-mode .gender-die {
    color: #f87171;
}
body.dark-mode .gender-das {
    color: #4ade80;
}

/* ========================================================
   BEGINNER FRIENDLY: TAP-TO-TRANSLATE WORD HINTS
   ======================================================== */
.tap-hint-word {
    display: inline-block;
    cursor: pointer;
    border-bottom: 2px dotted #94a3b8;
    padding: 0 1px;
    border-radius: 3px;
    transition: all 0.15s ease;
    user-select: text;
}
.tap-hint-word:hover,
.tap-hint-word:focus-visible {
    color: var(--primary);
    background: rgba(88, 204, 2, 0.12);
    border-bottom-color: var(--primary);
}
body.dark-mode .tap-hint-word {
    border-bottom-color: #64748b;
}
body.dark-mode .tap-hint-word:hover {
    background: rgba(88, 204, 2, 0.22);
    border-bottom-color: var(--primary);
}

/* Floating Tooltip Popover */
.floating-word-tooltip {
    position: fixed;
    z-index: 10000;
    width: 260px;
    background: #ffffff;
    border-radius: 14px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.22), 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1.5px solid #e2e8f0;
    padding: 12px 14px;
    font-family: inherit;
    animation: tooltipPop 0.18s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    transform-origin: top center;
    pointer-events: auto;
}
body.dark-mode .floating-word-tooltip {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
}

@keyframes tooltipPop {
    0% {
        opacity: 0;
        transform: translateY(-6px) scale(0.96);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.tooltip-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
}
.tooltip-german-word {
    font-size: 16px;
    font-weight: 800;
    color: var(--dark-text);
}
.tooltip-speaker-btn {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    font-size: 13px;
    padding: 3px 7px;
    cursor: pointer;
    color: #1d4ed8;
    transition: transform 0.1s ease;
}
.tooltip-speaker-btn:hover {
    transform: scale(1.08);
    background: #dbeafe;
}
.tooltip-close-btn {
    background: transparent;
    border: none;
    font-size: 13px;
    color: #94a3b8;
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
}
.tooltip-close-btn:hover {
    color: var(--dark-text);
}

.tooltip-phonetic-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    font-size: 11px;
    color: #0284c7;
    margin-bottom: 8px;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
.phonetic-en {
    font-weight: 600;
}
.phonetic-divider {
    color: #cbd5e1;
}
.phonetic-bn {
    color: #059669;
    font-weight: 700;
    font-family: inherit;
}

.tooltip-body {
    border-top: 1px solid #f1f5f9;
    padding-top: 6px;
}
body.dark-mode .tooltip-body {
    border-top-color: #334155;
}
.tooltip-meaning-en {
    font-size: 13px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 2px;
}
.tooltip-meaning-bn {
    font-size: 12px;
    color: #475569;
}
body.dark-mode .tooltip-meaning-bn {
    color: #94a3b8;
}

/* ========================================================
   RUNNER TOP BAR: HEARTS CLUSTER & BEGINNER SHIELD PILL
   ======================================================== */
.runner-hearts-cluster {
    display: flex;
    align-items: center;
    gap: 6px;
}

.runner-ad-heart-btn {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    border: 1px solid #fca5a5;
    color: #dc2626;
    font-size: 11px;
    font-weight: 800;
    border-radius: 12px;
    padding: 3px 8px;
    cursor: pointer;
    transition: all 0.15s ease;
    animation: heartPulse 2.4s infinite ease-in-out;
    display: inline-flex;
    align-items: center;
    gap: 2px;
}
.runner-ad-heart-btn:hover {
    background: #ef4444;
    color: #ffffff;
    border-color: #dc2626;
    transform: translateY(-1px);
}
@keyframes heartPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 10px rgba(239, 68, 68, 0.4);
    }
}

.beginner-shield-pill {
    background: #ecfdf5;
    border: 1px solid #a7f3d0;
    color: #047857;
    font-size: 10px;
    font-weight: 800;
    border-radius: 12px;
    padding: 3px 8px;
    letter-spacing: 0.3px;
    box-shadow: 0 1px 3px rgba(16, 185, 129, 0.15);
}
body.dark-mode .beginner-shield-pill {
    background: #064e3b;
    border-color: #059669;
    color: #a7f3d0;
}

/* Feedback Drawer Beginner Shield Banner */
.feedback-shield-banner {
    background: #ecfdf5;
    border: 1.5px solid #6ee7b7;
    color: #065f46;
    border-radius: 10px;
    padding: 8px 12px;
    font-size: 13px;
    font-weight: 700;
    margin-top: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}
body.dark-mode .feedback-shield-banner {
    background: #064e3b;
    border-color: #047857;
    color: #a7f3d0;
}

/* ========================================================
   MODAL: REWARDED VIDEO AD WINDOW
   ======================================================== */
.rewarded-ad-window {
    max-width: 440px;
    border-radius: 20px;
    overflow: hidden;
    padding: 0;
    background: #0f172a;
    color: #f8fafc;
    border: 1.5px solid #334155;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
}

.ad-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: #1e293b;
    border-bottom: 1px solid #334155;
}
.ad-sponsor-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 700;
    color: #94a3b8;
}
.ad-close-btn {
    color: #94a3b8;
    background: transparent;
    border: none;
    font-size: 16px;
}

.ad-video-screen {
    position: relative;
    padding: 28px 20px 20px 20px;
    background: radial-gradient(circle at 50% 20%, #1e293b 0%, #0f172a 100%);
    text-align: center;
}

.ad-sponsor-logo {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    color: #f8fafc;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.ad-pulse-visual {
    position: relative;
    width: 76px;
    height: 76px;
    margin: 0 auto 16px auto;
    display: flex;
    align-items: center;
    justify-content: center;
}
.ad-play-center {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    box-shadow: 0 10px 20px rgba(239, 68, 68, 0.4);
    z-index: 2;
}
.pulse-ring {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: 50%;
    border: 2px solid rgba(239, 68, 68, 0.6);
    animation: pulseRing 1.8s cubic-bezier(0.215, 0.61, 0.355, 1) infinite;
}
@keyframes pulseRing {
    0% {
        transform: scale(0.8);
        opacity: 0.8;
    }
    100% {
        transform: scale(1.4);
        opacity: 0;
    }
}

.ad-spotlight-title {
    font-size: 18px;
    font-weight: 800;
    color: #ffffff;
    margin-bottom: 8px;
    line-height: 1.3;
}
.ad-spotlight-desc {
    font-size: 13px;
    color: #94a3b8;
    line-height: 1.45;
    margin-bottom: 14px;
}
.ad-callout-pill {
    display: inline-block;
    background: rgba(234, 179, 8, 0.15);
    color: #fde047;
    border: 1px solid rgba(234, 179, 8, 0.3);
    font-size: 11px;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.ad-progress-wrapper {
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 10px 14px;
}
.ad-countdown-timer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 700;
    color: #f1f5f9;
    margin-bottom: 8px;
}
.ad-progress-track {
    width: 100%;
    height: 8px;
    background: #334155;
    border-radius: 4px;
    overflow: hidden;
}
.ad-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #ef4444 0%, #22c55e 100%);
    transition: width 0.1s linear;
}

.ad-modal-footer {
    padding: 16px 20px;
    background: #1e293b;
    border-top: 1px solid #334155;
}
.ad-claim-btn {
    padding: 14px;
    font-size: 15px;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.ad-claim-btn.unlocked {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%) !important;
    border-color: #15803d !important;
    animation: claimPulse 1.2s infinite ease-in-out;
}
@keyframes claimPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
        box-shadow: 0 0 16px rgba(34, 197, 94, 0.5);
    }
}

/* ========================================================
   GENTLE DICTATION HELPER CHIPS (DAYS 1-7)
   ======================================================== */
.dictation-helper-box {
    margin-top: 14px;
    background: #f8fafc;
    border: 1px dashed #cbd5e1;
    border-radius: 10px;
    padding: 10px 12px;
    text-align: center;
}
body.dark-mode .dictation-helper-box {
    background: #1e293b;
    border-color: #334155;
}
.dictation-helper-title {
    font-size: 11px;
    font-weight: 700;
    color: var(--gray-text);
    margin-bottom: 8px;
}
.dictation-chips-row {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    justify-content: center;
}
.dictation-word-chip {
    background: #ffffff;
    border: 1.5px solid var(--gray-border);
    border-radius: 8px;
    padding: 6px 10px;
    font-size: 13px;
    font-weight: 700;
    color: var(--blue-dark);
    cursor: pointer;
    box-shadow: 0 2px 0 var(--gray-border);
    transition: all 0.1s ease;
}
.dictation-word-chip:hover {
    border-color: var(--primary);
    transform: translateY(-1px);
}
.dictation-word-chip:active {
    transform: translateY(1px);
    box-shadow: none;
}
body.dark-mode .dictation-word-chip {
    background: #0f172a;
    border-color: #334155;
    box-shadow: 0 2px 0 #334155;
    color: #e2e8f0;
}

/* ========================================================
   DUOLINGO OPTIMIZATION 1: IN-LESSON COMBO STREAK BANNER
   ======================================================== */
.runner-combo-banner {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 100%);
    border: 1.5px solid #f59e0b;
    border-radius: 20px;
    padding: 6px 16px;
    margin: 8px auto;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.25);
    animation: comboSlideIn 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}
body.dark-mode .runner-combo-banner {
    background: linear-gradient(135deg, #78350f 0%, #451a03 100%);
    border-color: #d97706;
}
@keyframes comboSlideIn {
    0% {
        opacity: 0;
        transform: translateY(-10px) scale(0.9);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.combo-flame {
    font-size: 18px;
    animation: flamePulse 1s infinite alternate ease-in-out;
}
@keyframes flamePulse {
    0% { transform: scale(1) rotate(-3deg); }
    100% { transform: scale(1.2) rotate(4deg); }
}
.combo-text {
    font-size: 13px;
    font-weight: 800;
    color: #b45309;
    letter-spacing: 0.5px;
}
body.dark-mode .combo-text {
    color: #fde68a;
}
.combo-xp-chip {
    background: #f59e0b;
    color: #ffffff;
    font-size: 11px;
    font-weight: 800;
    padding: 2px 7px;
    border-radius: 10px;
}

/* ========================================================
   DUOLINGO OPTIMIZATION 2: MASCOT DIALOGUE SPEECH BUBBLES
   ======================================================== */
.mascot-speech-bubble-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin: 16px 0 24px 0;
}
.mascot-bubble-avatar {
    width: 58px;
    height: 58px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
    border: 2px solid #7dd3fc;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    flex-shrink: 0;
    box-shadow: 0 4px 10px rgba(14, 165, 233, 0.2);
    animation: mascotIdle 3s infinite ease-in-out;
}
@keyframes mascotIdle {
    0%, 100% { transform: translateY(0) rotate(0); }
    50% { transform: translateY(-3px) rotate(2deg); }
}

.speech-bubble {
    position: relative;
    background: #ffffff;
    border: 2px solid var(--gray-border);
    border-radius: 16px;
    padding: 14px 18px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    flex: 1;
}
body.dark-mode .speech-bubble {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

/* Triangle Pointer pointing left toward avatar */
.speech-bubble::before {
    content: '';
    position: absolute;
    top: 18px;
    left: -10px;
    width: 0;
    height: 0;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    border-right: 10px solid var(--gray-border);
}
.speech-bubble::after {
    content: '';
    position: absolute;
    top: 19px;
    left: -7px;
    width: 0;
    height: 0;
    border-top: 7px solid transparent;
    border-bottom: 7px solid transparent;
    border-right: 8px solid #ffffff;
}
body.dark-mode .speech-bubble::after {
    border-right-color: #1e293b;
}

.speech-bubble-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.speech-bubble-text {
    font-size: 18px;
    font-weight: 800;
    color: var(--blue-dark);
    line-height: 1.35;
}
body.dark-mode .speech-bubble-text {
    color: #f1f5f9;
}
.speech-speaker-btn {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    color: #1d4ed8;
    cursor: pointer;
    flex-shrink: 0;
    transition: transform 0.15s ease, background 0.15s ease;
}
.speech-speaker-btn:hover {
    transform: scale(1.08);
    background: #dbeafe;
}

/* ========================================================
   DUOLINGO OPTIMIZATION 3: VISUAL PICTURE / EMOJI CHOICE CARDS
   ======================================================== */
.visual-cards-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin: 18px 0;
}
@media (min-width: 640px) {
    .visual-cards-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 14px;
    }
}
.visual-choice-card {
    background: #ffffff;
    border: 2px solid var(--gray-border);
    border-bottom: 4px solid var(--gray-border);
    border-radius: 16px;
    padding: 16px 12px;
    text-align: center;
    cursor: pointer;
    transition: all 0.12s ease;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    min-height: 130px;
    user-select: none;
}
body.dark-mode .visual-choice-card {
    background: #1e293b;
    border-color: #334155;
    border-bottom-color: #1e293b;
}
.visual-choice-card:hover {
    border-color: #94a3b8;
    transform: translateY(-2px);
    border-bottom-width: 6px;
}
.visual-choice-card.selected {
    border-color: var(--primary) !important;
    border-bottom-color: #46a302 !important;
    background: #f0fdf4 !important;
    transform: translateY(2px);
    border-bottom-width: 2px !important;
}
body.dark-mode .visual-choice-card.selected {
    background: #064e3b !important;
    border-color: #10b981 !important;
    border-bottom-color: #047857 !important;
}
.visual-card-key {
    position: absolute;
    top: 8px;
    left: 8px;
    font-size: 11px;
    font-weight: 800;
    color: var(--gray-text);
    background: var(--gray-light);
    border: 1px solid var(--gray-border);
    border-radius: 6px;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.visual-card-emoji {
    font-size: 42px;
    line-height: 1;
    margin: 6px 0 10px 0;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.visual-choice-card:hover .visual-card-emoji {
    transform: scale(1.12);
}
.visual-card-label {
    font-size: 14px;
    font-weight: 800;
    color: var(--dark-text);
    line-height: 1.25;
}

/* ========================================================
   DUOLINGO OPTIMIZATION 4: WORD-TILE SPRING & RECESSED SLOTS
   ======================================================== */
.word-tile-btn.placed {
    background: #f1f5f9 !important;
    border: 2px dashed #cbd5e1 !important;
    border-bottom: 2px dashed #cbd5e1 !important;
    color: transparent !important;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04) !important;
    cursor: default !important;
    transform: none !important;
    pointer-events: none;
}
body.dark-mode .word-tile-btn.placed {
    background: #0f172a !important;
    border-color: #334155 !important;
}

.tray-word-chip {
    background: #ffffff;
    border: 2px solid var(--gray-border);
    border-bottom: 4px solid var(--gray-border);
    border-radius: 12px;
    padding: 8px 14px;
    font-size: 15px;
    font-weight: 700;
    color: var(--dark-text);
    cursor: pointer;
    transition: all 0.12s ease;
    animation: trayTilePop 0.16s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}
@keyframes trayTilePop {
    0% { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}
.tray-word-chip:hover {
    border-color: #ef4444;
    color: #dc2626;
    transform: translateY(-1px);
}
body.dark-mode .tray-word-chip {
    background: #1e293b;
    border-color: #334155;
    border-bottom-color: #0f172a;
    color: #f1f5f9;
}

/* ========================================================
   DUOLINGO OPTIMIZATION 5: REVIEW TRANSITION OVERLAY
   ======================================================== */
.review-transition-overlay {
    position: absolute;
    top: 70px;
    left: 20px;
    right: 20px;
    z-index: 50;
    animation: reviewCardDrop 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes reviewCardDrop {
    0% { transform: translateY(-20px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}
.review-transition-card {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 2px solid #3b82f6;
    border-radius: 16px;
    padding: 16px 20px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(59, 130, 246, 0.25);
}
body.dark-mode .review-transition-card {
    background: linear-gradient(135deg, #1e3a8a 0%, #172554 100%);
    border-color: #60a5fa;
}
.review-transition-icon {
    font-size: 32px;
    margin-bottom: 4px;
}
.review-transition-title {
    font-size: 16px;
    font-weight: 800;
    color: #1e40af;
    margin-bottom: 4px;
}
body.dark-mode .review-transition-title {
    color: #93c5fd;
}
.review-transition-sub {
    font-size: 13px;
    color: #3b82f6;
    margin: 0;
}
body.dark-mode .review-transition-sub {
    color: #bfdbfe;
}

/* End-of-Lesson Celebration Upgrades */
.reward-mascot-jump {
    font-size: 54px;
    line-height: 1;
    margin-bottom: 8px;
    animation: mascotJump 1.2s infinite ease-in-out;
}
@keyframes mascotJump {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-12px) scale(1.08); }
}
.reward-combo-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: linear-gradient(135deg, #fff7ed 0%, #fef3c7 100%);
    border: 1.5px solid #f59e0b;
    border-radius: 20px;
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 800;
    color: #b45309;
    margin-bottom: 16px;
}
body.dark-mode .reward-combo-pill {
    background: linear-gradient(135deg, #78350f 0%, #451a03 100%);
    border-color: #d97706;
    color: #fde68a;
}

/* ========================================================
   STORIES (KURZGESCHICHTEN) STYLING
   ======================================================== */
.stories-hero-banner {
    display: flex;
    align-items: center;
    gap: 16px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 2px solid #f59e0b;
    border-radius: var(--radius-lg);
    padding: 18px 20px;
    margin-bottom: 20px;
}
body.dark-mode .stories-hero-banner {
    background: linear-gradient(135deg, #78350f 0%, #451a03 100%);
    border-color: #d97706;
}
.stories-hero-icon {
    font-size: 40px;
    line-height: 1;
}
.stories-hero-title {
    font-size: 20px;
    font-weight: 800;
    color: #92400e;
    margin-bottom: 4px;
}
body.dark-mode .stories-hero-title {
    color: #fef3c7;
}
.stories-hero-sub {
    font-size: 13px;
    color: #b45309;
    margin: 0;
    line-height: 1.4;
}
body.dark-mode .stories-hero-sub {
    color: #fde68a;
}

.stories-cards-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
}
@media (min-width: 600px) {
    .stories-cards-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}
.story-card {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-bottom: 4px solid var(--gray-border);
    border-radius: var(--radius-lg);
    padding: 16px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.story-card:hover {
    transform: translateY(-2px);
    border-color: var(--blue);
    border-bottom-width: 6px;
}
.story-card.completed {
    border-color: #86efac;
    background: #f0fdf4;
}
body.dark-mode .story-card.completed {
    background: #064e3b;
    border-color: #059669;
}
.story-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}
.story-icon-circle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #eff6ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}
body.dark-mode .story-icon-circle {
    background: #1e3a8a;
}
.story-badge-cluster {
    display: flex;
    gap: 6px;
}
.story-level-badge {
    background: #e0f2fe;
    color: #0369a1;
    font-size: 11px;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: 6px;
}
.story-xp-chip {
    background: #fef3c7;
    color: #b45309;
    font-size: 11px;
    font-weight: 800;
    padding: 3px 8px;
    border-radius: 6px;
}
.story-card-title {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--dark-text);
}
.story-card-desc {
    font-size: 13px;
    color: var(--gray-text);
    line-height: 1.4;
    margin-bottom: 14px;
}
.story-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid var(--gray-border);
    padding-top: 10px;
}
.story-status-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--gray-text);
}
.story-action-btn {
    padding: 6px 12px;
    font-size: 12px;
    width: auto;
}

/* Story Reader Modal */
#story-reader-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    z-index: 1000;
    display: none;
    flex-direction: column;
}
#story-reader-modal.active {
    display: flex;
}
.story-reader-top {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 2px solid var(--gray-border);
    background: var(--surface);
    gap: 12px;
}
.story-progress-bar {
    flex: 1;
    height: 10px;
    background: var(--gray-light);
    border-radius: 20px;
    overflow: hidden;
}
.story-progress-fill {
    height: 100%;
    background: #f59e0b;
    border-radius: 20px;
    transition: width 0.3s ease;
}
.story-lines-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px;
    max-width: 680px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.story-narrator-line {
    background: var(--gray-light);
    border-radius: 12px;
    padding: 12px 16px;
    font-style: italic;
    color: var(--dark-text);
}
.narrator-text {
    font-size: 16px;
    font-weight: 700;
    line-height: 1.4;
}
.narrator-translation {
    font-size: 13px;
    color: var(--gray-text);
    margin-top: 4px;
}
.story-dialogue-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    animation: storyLineFade 0.3s ease-out;
}
@keyframes storyLineFade {
    0% { opacity: 0; transform: translateY(10px); }
    100% { opacity: 1; transform: translateY(0); }
}
.story-avatar-bubble {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: #e0f2fe;
    border: 2px solid #7dd3fc;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
    cursor: pointer;
}
.story-speech-bubble {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: 16px;
    padding: 12px 16px;
    flex: 1;
    box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}
.speaker-marlene .story-speech-bubble {
    border-left: 4px solid #3b82f6;
}
.speaker-lukas .story-speech-bubble {
    border-left: 4px solid #10b981;
}
.story-speaker-name {
    font-size: 11px;
    font-weight: 800;
    color: var(--gray-text);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 2px;
}
.story-dialogue-text {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark-text);
    line-height: 1.35;
}
.story-dialogue-sub {
    font-size: 13px;
    color: var(--gray-text);
    margin-top: 4px;
}
.story-speaker-btn {
    background: transparent;
    border: none;
    font-size: 18px;
    cursor: pointer;
    padding: 4px;
    color: var(--blue);
}
.story-checkpoint-card {
    background: #fffbeb;
    border: 2px solid #f59e0b;
    border-radius: 16px;
    padding: 16px;
    margin: 8px 0;
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.15);
}
body.dark-mode .story-checkpoint-card {
    background: #451a03;
    border-color: #d97706;
}
.story-checkpoint-card.cleared {
    border-color: #10b981;
    background: #f0fdf4;
}
body.dark-mode .story-checkpoint-card.cleared {
    background: #064e3b;
    border-color: #059669;
}
.checkpoint-header {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
}
.checkpoint-badge {
    font-size: 11px;
    font-weight: 800;
    color: #b45309;
    text-transform: uppercase;
}
.checkpoint-question {
    font-size: 16px;
    font-weight: 800;
    margin-bottom: 12px;
}
.checkpoint-options-grid {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.checkpoint-opt-btn {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: 12px;
    padding: 10px 14px;
    font-size: 15px;
    font-weight: 700;
    text-align: left;
    cursor: pointer;
    transition: all 0.15s ease;
}
.checkpoint-opt-btn:hover {
    border-color: var(--blue);
}
.checkpoint-opt-btn.correct {
    background: #dcfce7 !important;
    border-color: #22c55e !important;
    color: #15803d !important;
}
.checkpoint-opt-btn.incorrect {
    background: #fee2e2 !important;
    border-color: #ef4444 !important;
    color: #b91c1c !important;
}
.story-reader-footer {
    padding: 14px 16px;
    border-top: 2px solid var(--gray-border);
    background: var(--surface);
    max-width: 680px;
    margin: 0 auto;
    width: 100%;
}
.story-finish-card {
    text-align: center;
    padding: 24px 16px;
    background: var(--surface);
    border: 2px solid var(--primary);
    border-radius: 16px;
    margin-top: 14px;
}
.story-finish-mascot {
    font-size: 46px;
    margin-bottom: 8px;
}
.story-finish-title {
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 6px;
}
.story-finish-desc {
    font-size: 14px;
    color: var(--gray-text);
    margin-bottom: 16px;
}
.story-finish-rewards {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* ========================================================
   GOETHE-ZERTIFIKAT A1 EXAM SIMULATOR & CERTIFICATE STYLING
   ======================================================== */
#exam-simulator-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    z-index: 1000;
    display: none;
    flex-direction: column;
}
#exam-simulator-modal.active {
    display: flex;
}
.exam-top-bar {
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    border-bottom: 2px solid var(--gray-border);
    background: var(--surface);
}
.exam-timer-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #eff6ff;
    border: 2px solid #3b82f6;
    border-radius: 20px;
    padding: 4px 12px;
    font-size: 14px;
    font-weight: 800;
    color: #1e40af;
}
.exam-nav-bar {
    display: flex;
    background: var(--surface);
    border-bottom: 1px solid var(--gray-border);
    overflow-x: auto;
    padding: 6px 12px;
    gap: 8px;
}
.exam-nav-pill {
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 800;
    border: 1px solid var(--gray-border);
    background: var(--gray-light);
    color: var(--gray-text);
    cursor: pointer;
    white-space: nowrap;
}
.exam-nav-pill.active {
    background: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}
.exam-content-area {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
}
.exam-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}
.exam-pts-badge {
    background: #dbeafe;
    color: #1e40af;
    font-size: 12px;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 12px;
}
.exam-tasks-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.exam-task-card {
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: 14px;
    padding: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}
.exam-audio-player-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    padding: 8px 12px;
    margin-bottom: 12px;
}
.exam-play-audio-btn {
    background: #2563eb;
    color: #ffffff;
    border: none;
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
}
.audio-hint {
    font-size: 11px;
    color: #3b82f6;
    font-weight: 600;
}
.exam-reading-box {
    background: var(--gray-light);
    border: 1px solid var(--gray-border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 12px;
}
.exam-q-text {
    font-size: 15px;
    font-weight: 800;
    margin-bottom: 10px;
}
.exam-mcq-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.exam-radio-label {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--surface);
    border: 2px solid var(--gray-border);
    border-radius: 10px;
    padding: 10px 14px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.15s ease;
}
.exam-radio-label:hover {
    border-color: var(--blue);
}
.exam-radio-label.selected {
    border-color: var(--primary);
    background: #f0fdf4;
}
.exam-formular-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
    margin-top: 12px;
}
.exam-footer-bar {
    padding: 12px 16px;
    border-top: 2px solid var(--gray-border);
    background: var(--surface);
    max-width: 720px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    justify-content: space-between;
}

/* Verifiable Official Goethe A1 Certificate */
.certificate-container {
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.12);
    margin: 20px auto;
    max-width: 650px;
    color: #1e293b;
}
.certificate-border {
    border: 6px double #d97706;
    padding: 30px 24px;
    background: linear-gradient(135deg, #fffbeb 0%, #ffffff 50%, #fffbeb 100%);
}
.cert-flag-bar {
    display: flex;
    margin-bottom: 14px;
}
.cert-title {
    font-family: 'Times New Roman', serif;
    font-size: 26px;
    font-weight: 900;
    color: #000000;
    text-align: center;
    letter-spacing: 2px;
    margin-bottom: 2px;
}
.cert-sub {
    text-align: center;
    font-size: 13px;
    font-weight: 800;
    color: #b45309;
    letter-spacing: 1.5px;
    margin-bottom: 4px;
}
.cert-institution {
    text-align: center;
    font-size: 11px;
    color: #64748b;
    margin-bottom: 22px;
    font-style: italic;
}
.cert-p {
    font-size: 13px;
    text-align: center;
    margin-bottom: 6px;
    color: #334155;
}
.cert-name {
    font-family: 'Times New Roman', serif;
    font-size: 24px;
    font-weight: 800;
    text-align: center;
    color: #0f172a;
    border-bottom: 2px solid #e2e8f0;
    padding-bottom: 6px;
    margin: 8px auto 14px auto;
    max-width: 380px;
}
.cert-score-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    margin: 18px 0;
    text-align: center;
}
.cert-score-col {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: 6px;
    padding: 8px 4px;
}
.cert-score-col .col-val {
    font-size: 14px;
    font-weight: 800;
    color: #0f172a;
}
.cert-score-col .col-lbl {
    font-size: 10px;
    color: #64748b;
    margin-top: 2px;
}
.cert-total-banner {
    text-align: center;
    padding: 12px;
    border-radius: 8px;
    margin: 14px 0;
}
.cert-total-banner.passed {
    background: #dcfce7;
    border: 2px solid #16a34a;
}
.cert-total-banner.failed {
    background: #fee2e2;
    border: 2px solid #dc2626;
}
.total-pts-badge {
    font-size: 17px;
    font-weight: 900;
    color: #166534;
}
.cert-total-banner.failed .total-pts-badge {
    color: #991b1b;
}
.grade-badge {
    font-size: 13px;
    font-weight: 700;
    color: #15803d;
    margin-top: 2px;
}
.cert-total-banner.failed .grade-badge {
    color: #b91c1c;
}
.cert-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 26px;
    border-top: 1px dashed #cbd5e1;
    padding-top: 16px;
}
.cert-sig-box {
    text-align: center;
    font-size: 11px;
}
.cert-sig-line {
    font-family: 'Brush Script MT', cursive, sans-serif;
    font-size: 18px;
    color: #1e3a8a;
    border-bottom: 1px solid #94a3b8;
    padding-bottom: 2px;
    margin-bottom: 4px;
}
.cert-sig-label {
    color: #64748b;
    font-size: 10px;
}
.cert-stamp-seal {
    width: 62px;
    height: 62px;
    border: 3px double #d97706;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    font-weight: 800;
    color: #b45309;
    transform: rotate(-8deg);
}
.cert-actions-bar {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin: 14px auto 30px auto;
}

@media print {
    body * {
        visibility: hidden;
    }
    #printable-certificate, #printable-certificate * {
        visibility: visible;
    }
    #printable-certificate {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        margin: 0;
        box-shadow: none;
    }
}

/* Ad-Unlock Lesson Pill on Learning Path */
.ad-unlock-trigger-pill {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 1.5px solid #3b82f6;
    border-radius: 20px;
    padding: 3px 10px;
    font-size: 11px;
    font-weight: 800;
    color: #1d4ed8;
    cursor: pointer;
    margin-top: 4px;
    transition: all 0.15s ease;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.15);
}
.ad-unlock-trigger-pill:hover {
    transform: scale(1.06);
    background: #bfdbfe;
    border-color: #2563eb;
}
body.dark-mode .ad-unlock-trigger-pill {
    background: #1e3a8a;
    border-color: #60a5fa;
    color: #bfdbfe;
}

/* ========================================================
   Interactive German Alphabet Soundboard
   ======================================================== */
.sb-letter-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    background: var(--card-bg, #ffffff);
    border: 2px solid var(--gray-border, #cbd5e1);
    border-radius: var(--radius-sm, 8px);
    box-shadow: 0 3px 0 #cbd5e1;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
    padding: 4px 2px;
}
.sb-letter-tile:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 0 #94a3b8;
    border-color: #38bdf8;
}
.sb-letter-tile:active {
    transform: translateY(2px);
    box-shadow: 0 1px 0 #94a3b8;
}
.sb-letter-tile.active {
    border-color: #0284c7 !important;
    background: #e0f2fe !important;
    box-shadow: 0 3px 0 #0284c7 !important;
}
.sb-letter-tile.special {
    background: #fefce8;
    border-color: #fde047;
    box-shadow: 0 3px 0 #eab308;
}
.sb-letter-tile.special.active {
    background: #fef08a !important;
    border-color: #ca8a04 !important;
    box-shadow: 0 3px 0 #ca8a04 !important;
}
.sb-letter-char {
    font-size: 19px;
    font-weight: 900;
    line-height: 1.1;
    color: var(--dark-text, #0f172a);
}
.sb-letter-phon {
    font-size: 10px;
    color: var(--gray-text, #64748b);
    font-weight: 700;
    line-height: 1;
    margin-top: 2px;
}
body.dark-mode .sb-letter-tile {
    background: #1e293b;
    border-color: #334155;
    box-shadow: 0 3px 0 #0f172a;
}
body.dark-mode .sb-letter-char {
    color: #f8fafc;
}
body.dark-mode .sb-letter-tile.active {
    background: #0369a1 !important;
    border-color: #38bdf8 !important;
}
body.dark-mode .sb-letter-tile.special {
    background: #422006;
    border-color: #a16207;
}