/* ===================================================
   بوابة اللياقة البدنية والتربية الصحية (2) - الصف الثالث ثانوي
   الوحدة الأولى: تطبيقات اللياقة البدنية والصحة (1) - نظام المسارات
   تصميم عصري رياضي متجاوب | دعم كامل للوضع الليلي والنهاري ونمط العرض الصفي
   =================================================== */

:root {
    --primary: #10b981;
    --primary-dark: #059669;
    --primary-light: #34d399;
    --secondary: #2563eb;
    --secondary-dark: #1d4ed8;
    --accent: #f59e0b;
    --accent-orange: #f97316;
    --danger: #ef4444;
    --success: #10b981;

    /* Theme colors: Dark Mode (Default) */
    --bg-main: #0b0f19;
    --bg-surface: #111827;
    --bg-card: #1f2937;
    --bg-alt: #0d1322;
    --border-color: rgba(255, 255, 255, 0.09);
    --border-highlight: rgba(16, 185, 129, 0.35);
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5), 0 8px 10px -6px rgba(0, 0, 0, 0.5);
    --card-glow: 0 0 25px rgba(16, 185, 129, 0.15);
    --nav-bg: rgba(11, 15, 25, 0.88);

    --font-main: 'Cairo', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-card: #ffffff;
    --bg-alt: #f1f5f9;
    --border-color: #e2e8f0;
    --border-highlight: rgba(16, 185, 129, 0.5);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.07), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --card-glow: 0 0 20px rgba(16, 185, 129, 0.1);
    --nav-bg: rgba(255, 255, 255, 0.9);
}

/* Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: var(--font-main);
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Scroll Progress Bar */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    width: 0%;
    z-index: 1000;
    transition: width 0.1s ease-out;
}

/* Container */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* Typography & Badges */
h1, h2, h3, h4, h5 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-primary);
}

p {
    color: var(--text-secondary);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-light) 0%, #38bdf8 50%, #818cf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(16, 185, 129, 0.12);
    color: var(--primary-light);
    border: 1px solid rgba(16, 185, 129, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.badge-accent {
    background: rgba(37, 99, 235, 0.12);
    color: #60a5fa;
    border-color: rgba(37, 99, 235, 0.3);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 50px auto;
}

.section-title {
    font-size: 2.2rem;
    margin-bottom: 14px;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 26px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-normal);
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
}

.btn-primary:hover:not([disabled]) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.5);
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
}

.btn-secondary {
    background: linear-gradient(135deg, var(--secondary), var(--secondary-dark));
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.35);
}

.btn-secondary:hover:not([disabled]) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1.5px solid var(--border-color);
}

.btn-outline:hover:not([disabled]) {
    border-color: var(--primary);
    background: rgba(16, 185, 129, 0.08);
    color: var(--primary-light);
}

.btn-icon {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

/* Top Navbar */
.navbar {
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 999;
    padding: 12px 0;
}

.nav-container {
    width: 92%;
    max-width: 1300px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(37, 99, 235, 0.2));
    border: 1.5px solid var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-light);
}

.logo-icon svg {
    width: 24px;
    height: 24px;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1.2;
}

.logo-badge {
    font-size: 0.76rem;
    color: var(--primary-light);
    font-weight: 700;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 7px 12px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--primary-light);
    font-weight: 700;
}

.nav-highlight {
    background: rgba(16, 185, 129, 0.12) !important;
    color: var(--primary-light) !important;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.mobile-menu-btn {
    display: none;
}

/* Mode Switchers in Header */
.mode-switch-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(16, 185, 129, 0.2));
    border: 1.5px solid var(--secondary);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mode-switch-btn:hover {
    background: var(--secondary);
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
    transform: translateY(-1px);
}

.sound-toggle-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.sound-toggle-btn:hover {
    border-color: var(--primary);
    color: var(--primary-light);
}

[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* Hero Section */
.hero-section {
    position: relative;
    padding: 80px 0 60px 0;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -150px;
    right: 50%;
    transform: translateX(50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(16, 185, 129, 0.15) 0%, rgba(37, 99, 235, 0.08) 50%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 40px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    font-size: 0.84rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.tag-pulse {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 10px var(--primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.3); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.8; }
}

.hero-title {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 18px;
    line-height: 1.25;
}

.hero-description {
    font-size: 1.12rem;
    line-height: 1.8;
    margin-bottom: 30px;
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 35px;
}

.hero-metrics {
    display: flex;
    align-items: center;
    gap: 18px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
}

.metric-item {
    display: flex;
    flex-direction: column;
}

.metric-num {
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--primary-light);
    line-height: 1.1;
}

.metric-label {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.metric-divider {
    width: 1px;
    height: 35px;
    background: var(--border-color);
}

/* Hero Glass Card */
.card-hero-glass {
    background: rgba(31, 41, 55, 0.5);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow), var(--card-glow);
    overflow: hidden;
}

[data-theme="light"] .card-hero-glass {
    background: rgba(255, 255, 255, 0.7);
}

.glass-header {
    padding: 14px 20px;
    background: rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.glass-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-right: 8px;
}

.glass-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.vital-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 16px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.vital-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.vital-icon.heart-pulse {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
}

.vital-icon.oxygen-flow {
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
}

.vital-icon.target-hit {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.vital-info {
    display: flex;
    flex-direction: column;
}

.vital-name {
    font-size: 0.84rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.vital-val {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--text-primary);
}

.vital-val small {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: normal;
}

.interactive-quote {
    margin-top: 8px;
    padding: 14px 16px;
    background: rgba(16, 185, 129, 0.08);
    border-right: 3px solid var(--primary);
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--text-secondary);
    font-style: italic;
}

/* General Sections */
.section {
    padding: 70px 0;
}

.section.bg-alt {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

/* Media Showcase Grid */
.lesson-media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.lesson-media-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-fast);
}

.lesson-media-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-highlight);
}

.photo-container {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.photo-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.lesson-media-card:hover .photo-container img {
    transform: scale(1.05);
}

.photo-badge {
    position: absolute;
    bottom: 12px;
    right: 12px;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    color: #ffffff;
    padding: 5px 12px;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.photo-info {
    padding: 20px;
}

.photo-info h4 {
    font-size: 1.15rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.photo-info p {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Concepts Grid */
.concepts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 30px;
}

.concept-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.concept-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-highlight);
}

.concept-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
}

.concept-icon svg {
    width: 26px;
    height: 26px;
}

.color-blue { background: rgba(37, 99, 235, 0.15); color: #60a5fa; }
.color-green { background: rgba(16, 185, 129, 0.15); color: #34d399; }
.color-orange { background: rgba(249, 115, 22, 0.15); color: #fb923c; }

.concept-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.concept-card p {
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.concept-features {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.concept-features li::before {
    content: "◀ ";
    color: var(--primary-light);
    font-size: 0.8rem;
}

/* Test Protocol Box inside cards */
.test-protocol-box {
    margin-top: 14px;
    padding: 12px 14px;
    background: rgba(0, 0, 0, 0.18);
    border-radius: var(--radius-sm);
    border-right: 3px solid var(--primary);
    font-size: 0.88rem;
    line-height: 1.6;
}

[data-theme="light"] .test-protocol-box {
    background: rgba(0, 0, 0, 0.04);
}

.test-protocol-box p {
    margin: 6px 0;
    font-size: 0.88rem;
}

.badge-grade {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(16, 185, 129, 0.15);
    color: var(--primary-light);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 700;
    margin-top: 6px;
}

/* Elements Grid (Skill-Related) */
.elements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 22px;
}

.element-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.element-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-highlight);
}

.element-badge {
    position: absolute;
    top: 18px;
    left: 18px;
    padding: 3px 10px;
    background: rgba(37, 99, 235, 0.15);
    color: #60a5fa;
    border-radius: var(--radius-full);
    font-size: 0.76rem;
    font-weight: 700;
}

.element-icon {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

.element-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.element-desc {
    font-size: 0.9rem;
    margin-bottom: 14px;
    line-height: 1.6;
}

.element-test {
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    border-right: 2px solid var(--secondary);
}

/* Normative Comparison Tables */
.normative-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--card-shadow);
}

.normative-header h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.table-responsive {
    overflow-x: auto;
    width: 100%;
}

.normative-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
    text-align: right;
}

.normative-table th, .normative-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border-color);
}

.normative-table th {
    background: rgba(16, 185, 129, 0.1);
    color: var(--primary-light);
    font-weight: 700;
}

.normative-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Principles Grid (FITT-VP) */
.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.principle-item {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 22px;
    position: relative;
    box-shadow: var(--card-shadow);
}

.p-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    font-weight: 900;
    font-size: 1.1rem;
    margin-bottom: 12px;
}

.principle-item h4 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.principle-item p {
    font-size: 0.88rem;
    line-height: 1.6;
}

/* Safety Tips */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
}

.tip-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--card-shadow);
}

.tip-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.tip-card h3 {
    font-size: 1.05rem;
    margin-bottom: 8px;
}

.tip-card p {
    font-size: 0.88rem;
    line-height: 1.6;
}

/* Checkpoint Micro-Quiz */
.checkpoint-box {
    margin-top: 35px;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.06), rgba(37, 99, 235, 0.06));
    border: 1px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 25px;
}

.checkpoint-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.checkpoint-badge {
    background: var(--primary);
    color: #0b0f19;
    font-size: 0.82rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

.checkpoint-title {
    font-size: 1.05rem;
    font-weight: 700;
}

.checkpoint-question {
    font-size: 1.02rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.checkpoint-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 14px;
}

.checkpoint-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 18px;
    text-align: right;
    color: var(--text-primary);
    font-size: 0.94rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.checkpoint-btn:hover:not([disabled]) {
    border-color: var(--primary);
    background: rgba(16, 185, 129, 0.08);
}

.checkpoint-btn.correct {
    background: rgba(16, 185, 129, 0.2) !important;
    border-color: #10b981 !important;
    color: #34d399 !important;
    font-weight: 700;
}

.checkpoint-btn.incorrect {
    background: rgba(239, 68, 68, 0.2) !important;
    border-color: #ef4444 !important;
    color: #f87171 !important;
}

.checkpoint-result {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.92rem;
    line-height: 1.5;
    margin-top: 10px;
    display: none;
}

.checkpoint-result.show {
    display: block;
}

.checkpoint-result.success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid #10b981;
    color: #34d399;
}

.checkpoint-result.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid #ef4444;
    color: #f87171;
}

/* ===================================================
   NEW FEATURE: 3D Interactive Flip Cards
   =================================================== */
.flip-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 30px;
}

.flip-card {
    background-color: transparent;
    perspective: 1000px;
    height: 300px;
    cursor: pointer;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    border-radius: var(--radius-lg);
}

.flip-card.is-flipped .flip-card-inner,
.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: var(--radius-lg);
    padding: 24px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--card-shadow);
}

.flip-card-front {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
}

.flip-card-back {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-alt));
    border: 1.5px solid var(--primary);
    transform: rotateY(180deg);
    text-align: right;
    align-items: flex-start;
}

.flip-icon {
    font-size: 3rem;
    margin-bottom: 14px;
}

.flip-card-front h4 {
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.flip-sub {
    font-size: 0.88rem;
    color: var(--primary-light);
    font-weight: 600;
}

.flip-hint {
    margin-top: 14px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.flip-card-back h4 {
    font-size: 1.1rem;
    color: var(--primary-light);
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    width: 100%;
    padding-bottom: 6px;
}

.flip-card-back p {
    font-size: 0.86rem;
    line-height: 1.6;
    margin-bottom: 8px;
}

/* ===================================================
   NEW FEATURE: Interactive Matching Game
   =================================================== */
.matching-game-wrapper {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--card-shadow);
    margin-top: 35px;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.game-score-board {
    display: flex;
    align-items: center;
    gap: 14px;
}

.score-badge {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--primary);
    color: var(--primary-light);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-weight: 800;
}

.matching-board {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 768px) {
    .matching-board {
        grid-template-columns: 1fr;
    }
}

.matching-col h4 {
    font-size: 1.05rem;
    margin-bottom: 14px;
    color: var(--text-secondary);
    text-align: center;
}

.matching-cards-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.match-item {
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 14px 18px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.2s ease;
    user-select: none;
    text-align: right;
}

.match-item:hover:not(.matched) {
    border-color: var(--primary);
    transform: translateX(-4px);
    background: rgba(16, 185, 129, 0.08);
}

.match-item.selected {
    border-color: #38bdf8;
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
    box-shadow: 0 0 15px rgba(56, 189, 248, 0.3);
}

.match-item.matched {
    border-color: var(--primary);
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
    cursor: default;
    opacity: 0.85;
}

.match-item.wrong-shake {
    animation: shake 0.4s ease;
    border-color: #ef4444;
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-8px); }
    40%, 80% { transform: translateX(8px); }
}

.game-congrats {
    text-align: center;
    padding: 20px;
    background: rgba(16, 185, 129, 0.12);
    border: 1.5px solid var(--primary);
    border-radius: var(--radius-md);
    margin-top: 20px;
    display: none;
}

/* ===================================================
   Video Library
   =================================================== */
.video-notice-box {
    background: rgba(37, 99, 235, 0.08);
    border: 1px solid rgba(37, 99, 235, 0.3);
    border-radius: var(--radius-md);
    padding: 14px 20px;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.videos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 26px;
}

.video-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
}

.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    background: #000000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-content {
    padding: 20px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.video-tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(37, 99, 235, 0.15);
    color: #60a5fa;
    border-radius: var(--radius-full);
    font-size: 0.78rem;
    font-weight: 700;
    margin-bottom: 10px;
    width: fit-content;
}

.video-content h4 {
    font-size: 1.15rem;
    margin-bottom: 8px;
}

.video-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 14px;
}

.video-actions {
    margin-top: auto;
    display: flex;
    gap: 10px;
}

.btn-video-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.35);
    color: #ef4444;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.2s ease;
}

.btn-video-link:hover {
    background: #ef4444;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

/* ===================================================
   Interactive Smart Lab
   =================================================== */
.tabs-control {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 10px;
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 700;
    font-size: 0.92rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.tab-btn:hover {
    border-color: var(--primary);
    color: var(--text-primary);
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #ffffff;
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.lab-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--card-shadow);
}

.lab-header {
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 25px;
}

.lab-icon {
    font-size: 2.2rem;
}

.lab-header h3 {
    font-size: 1.3rem;
    margin-bottom: 4px;
}

.lab-header p {
    font-size: 0.92rem;
}

/* Calculator Grid */
.calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 35px;
}

@media (max-width: 768px) {
    .calculator-grid {
        grid-template-columns: 1fr;
    }
}

.calc-inputs {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.input-group input, .input-group select {
    padding: 11px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    outline: none;
    transition: var(--transition-fast);
}

.input-group input:focus, .input-group select:focus {
    border-color: var(--primary);
    background: var(--bg-surface);
}

.btn-calc {
    margin-top: 10px;
    width: 100%;
}

.calc-output {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.result-gauge {
    display: flex;
    flex-direction: column;
    margin-bottom: 10px;
}

.gauge-value {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-light);
    line-height: 1.1;
}

.gauge-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.result-status {
    font-size: 1.15rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.bmi-scale-bar {
    display: flex;
    width: 100%;
    height: 12px;
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-bottom: 18px;
}

.scale-step {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 800;
    color: #ffffff;
    opacity: 0.4;
    transition: opacity 0.2s ease;
}

.scale-step.active {
    opacity: 1;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.4);
}

.scale-step.under { background: #38bdf8; }
.scale-step.normal { background: #10b981; }
.scale-step.over { background: #f59e0b; }
.scale-step.obese { background: #ef4444; }

.calc-recommendation {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.thr-breakdown {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.9rem;
}

/* Reaction Time Simulator */
.reaction-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 15px 0;
}

.reaction-box {
    width: 100%;
    max-width: 600px;
    height: 240px;
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s ease, transform 0.1s ease;
    border: 2px solid transparent;
    padding: 20px;
}

.reaction-box:active {
    transform: scale(0.99);
}

.reaction-box.state-idle {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    border-color: rgba(59, 130, 246, 0.4);
    color: #f8fafc;
}

.reaction-box.state-waiting {
    background: linear-gradient(135deg, #b91c1c, #991b1b);
    border-color: #ef4444;
    color: #ffffff;
}

.reaction-box.state-ready {
    background: linear-gradient(135deg, #10b981, #059669);
    border-color: #34d399;
    color: #ffffff;
    box-shadow: 0 0 35px rgba(16, 185, 129, 0.6);
}

.reaction-box.state-clicked {
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    border-color: #60a5fa;
    color: #ffffff;
}

.reaction-box.state-early {
    background: linear-gradient(135deg, #d97706, #b45309);
    border-color: #f59e0b;
    color: #ffffff;
}

.reaction-icon-box {
    font-size: 2.6rem;
    margin-bottom: 8px;
}

.reaction-box h4 {
    font-size: 1.6rem;
    margin-bottom: 6px;
    color: inherit;
}

.reaction-box p {
    font-size: 0.95rem;
    opacity: 0.9;
    color: inherit;
}

.reaction-stats-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
    width: 100%;
}

.reaction-stat {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    padding: 10px 18px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 8px;
}

.reaction-stat .r-label {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.reaction-stat .r-val {
    font-weight: 700;
    color: var(--primary-light);
}

.reaction-info-table {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* Cadence Metronome */
.metronome-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
    gap: 20px;
}

.metro-circle-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
}

.metro-circle {
    width: 160px;
    height: 160px;
    border-radius: 50%;
    background: var(--bg-surface);
    border: 4px solid var(--primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 25px rgba(16, 185, 129, 0.2);
    transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.metro-circle.beat-up {
    transform: scale(1.12);
    border-color: #38bdf8;
    background: rgba(56, 189, 248, 0.15);
    box-shadow: 0 0 35px rgba(56, 189, 248, 0.5);
}

.metro-circle.beat-down {
    transform: scale(0.96);
    border-color: var(--primary);
    background: rgba(16, 185, 129, 0.15);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.4);
}

#metroActionText {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

#metroRepCounter {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--primary-light);
}

.metro-controls {
    display: flex;
    gap: 12px;
}

.metro-tip {
    max-width: 600px;
    text-align: center;
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Profile Form & Radar */
.profile-form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-top: 15px;
}

.profile-input-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.profile-input-item label {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.profile-input-item input {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.profile-result-box {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--card-shadow);
}

.overall-badge-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 14px;
    margin-bottom: 18px;
    flex-wrap: wrap;
    gap: 10px;
}

.overall-label {
    font-size: 1.05rem;
    font-weight: 700;
}

.overall-rating {
    background: rgba(16, 185, 129, 0.15);
    color: var(--primary-light);
    border: 1px solid var(--primary);
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-weight: 800;
    font-size: 1.1rem;
}

.radar-bars-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.radar-bar-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bar-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.88rem;
    font-weight: 600;
}

.bar-track {
    height: 10px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-full);
    overflow: hidden;
}

[data-theme="light"] .bar-track {
    background: rgba(0, 0, 0, 0.08);
}

.bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: linear-gradient(to left, var(--primary), #38bdf8);
    transition: width 0.6s ease;
}

.profile-advice {
    margin-top: 18px;
    padding: 14px;
    border-radius: var(--radius-md);
    background: rgba(16, 185, 129, 0.08);
    border-right: 4px solid var(--primary);
    font-size: 0.92rem;
    line-height: 1.6;
}

/* ===================================================
   20-Question Comprehensive Quiz with Filters
   =================================================== */
.quiz-filter-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    overflow-x: auto;
    padding-bottom: 8px;
}

.filter-pill {
    padding: 6px 14px;
    border-radius: var(--radius-full);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.84rem;
    font-weight: 700;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.filter-pill:hover, .filter-pill.active {
    border-color: var(--primary);
    color: var(--text-primary);
}

.filter-pill.active {
    background: rgba(16, 185, 129, 0.15);
    color: var(--primary-light);
}

.quiz-card, .quiz-wrapper {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    max-width: 860px;
    margin: 0 auto;
    padding: 36px;
    position: relative;
    overflow: hidden;
}

.quiz-header-bar {
    margin-bottom: 24px;
}

.quiz-step-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.quiz-score-badge {
    background: rgba(16, 185, 129, 0.12);
    color: var(--primary-light);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 4px 14px;
    border-radius: var(--radius-full);
}

.quiz-progress-track {
    height: 8px;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(to left, var(--primary), #38bdf8);
    transition: width 0.35s ease;
}

.quiz-question-title {
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.5;
    color: var(--text-primary);
}

.quiz-options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.quiz-opt-btn {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    padding: 15px 20px;
    background: var(--bg-card);
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.98rem;
    font-weight: 600;
    text-align: right;
    cursor: pointer;
    transition: all var(--transition-fast);
    width: 100%;
}

.quiz-opt-btn:hover:not([disabled]) {
    border-color: var(--primary);
    background: rgba(16, 185, 129, 0.08);
    transform: translateX(-4px);
}

.opt-letter {
    width: 32px;
    height: 32px;
    min-width: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.opt-text {
    flex: 1;
    text-align: right;
}

.opt-status-icon {
    font-weight: bold;
    font-size: 1.1rem;
}

.quiz-opt-btn.correct {
    background: rgba(16, 185, 129, 0.18) !important;
    border-color: var(--success) !important;
    color: #34d399 !important;
}

.quiz-opt-btn.incorrect {
    background: rgba(239, 68, 68, 0.18) !important;
    border-color: var(--danger) !important;
    color: #f87171 !important;
}

.quiz-feedback-box {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 18px 20px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    font-size: 0.95rem;
    animation: fadeIn 0.3s ease;
}

.feedback-correct {
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    color: #34d399;
}

.feedback-incorrect {
    background: rgba(239, 68, 68, 0.12);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #fca5a5;
}

.feedback-icon {
    font-size: 1.4rem;
    font-weight: 900;
}

.feedback-text strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1.05rem;
}

.feedback-text p {
    color: inherit;
    opacity: 0.95;
    line-height: 1.6;
    margin: 0;
}

.quiz-footer {
    display: flex;
    justify-content: flex-end;
}

.quiz-completed-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    max-width: 760px;
    margin: 0 auto;
    padding: 45px 30px;
    text-align: center;
    border-top: 5px solid var(--primary);
}

.completion-badge-icon {
    font-size: 4rem;
    margin-bottom: 12px;
}

.quiz-completed-card h3 {
    font-size: 1.8rem;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.completion-sub {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.score-circle-display {
    width: 140px;
    height: 140px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: rgba(16, 185, 129, 0.1);
    border: 4px solid var(--primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.25);
}

.score-number {
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--primary-light);
}

.score-percentage {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.completion-message {
    max-width: 600px;
    margin: 0 auto 28px;
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-primary);
}

.completion-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* Discussion Bank */
.discussion-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 25px;
}

.discussion-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 22px;
    box-shadow: var(--card-shadow);
    border-top: 4px solid var(--accent);
}

.discussion-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
}

.discussion-card h4 {
    font-size: 1.05rem;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.discussion-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===================================================
   Official Student Assessment Card & Worksheet
   =================================================== */
.official-card {
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
    max-width: 1000px;
    margin: 0 auto 40px auto;
}

.official-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(to right, var(--primary), var(--secondary), var(--accent));
}

.official-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px dashed var(--border-color);
    padding-bottom: 20px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 15px;
}

.ministry-branding span {
    font-size: 0.88rem;
    color: var(--text-secondary);
    display: block;
}

.ministry-branding h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 4px 0;
}

.card-subtitle-tag {
    display: inline-block;
    padding: 3px 12px;
    background: rgba(16, 185, 129, 0.12);
    color: var(--primary-light);
    border-radius: var(--radius-full);
    font-size: 0.82rem;
    font-weight: 700;
}

.card-stamp {
    border: 2px solid var(--border-color);
    padding: 8px 18px;
    border-radius: var(--radius-md);
    text-align: center;
    background: rgba(255, 255, 255, 0.02);
}

.card-stamp span {
    font-size: 0.78rem;
    color: var(--text-muted);
    display: block;
}

.card-stamp strong {
    color: var(--primary-light);
    font-size: 0.95rem;
}

.student-info-form {
    margin-bottom: 26px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin-bottom: 14px;
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-field label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.editable-input {
    padding: 10px 14px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    outline: none;
    transition: var(--transition-fast);
}

.editable-input:focus {
    border-color: var(--primary);
    background: var(--bg-surface);
}

.card-table-wrap {
    overflow-x: auto;
    margin-bottom: 26px;
}

.official-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: right;
}

.official-table th, .official-table td {
    padding: 12px 14px;
    border: 1px solid var(--border-color);
}

.official-table th {
    background: rgba(16, 185, 129, 0.08);
    color: var(--primary-light);
    font-weight: 700;
    text-align: center;
}

.table-input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px dashed var(--border-color);
    padding: 6px 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    text-align: center;
    font-family: inherit;
}

.table-input:focus {
    outline: none;
    border-bottom-color: var(--primary);
    background: rgba(16, 185, 129, 0.05);
}

.card-signatures {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
    gap: 20px;
}

.sig-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.sig-line {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--primary-light);
    min-width: 150px;
}

.card-controls {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 26px;
    flex-wrap: wrap;
}

/* ===================================================
   NEW FEATURE: Fullscreen Classroom Presentation Mode (Slides)
   =================================================== */
.presentation-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-main);
    z-index: 99999;
    display: none;
    flex-direction: column;
}

.presentation-overlay.active {
    display: flex;
}

.pres-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 30px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
}

.pres-title {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--primary-light);
}

.pres-slide-counter {
    font-size: 1rem;
    font-weight: 700;
    background: var(--bg-card);
    padding: 4px 14px;
    border-radius: var(--radius-full);
}

.pres-controls-top {
    display: flex;
    gap: 10px;
}

.pres-viewport {
    flex: 1;
    overflow-y: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
}

.pres-slide {
    display: none;
    max-width: 960px;
    width: 100%;
    animation: slideIn 0.35s ease;
}

.pres-slide.active {
    display: block;
}

@keyframes slideIn {
    from { opacity: 0; transform: scale(0.97); }
    to { opacity: 1; transform: scale(1); }
}

.slide-content-card {
    background: var(--bg-surface);
    border: 2px solid var(--border-highlight);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.slide-badge {
    background: var(--secondary);
    color: #ffffff;
    font-size: 0.85rem;
    font-weight: 800;
    padding: 4px 14px;
    border-radius: var(--radius-full);
    display: inline-block;
    margin-bottom: 16px;
}

.slide-title {
    font-size: 2.2rem;
    font-weight: 900;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.slide-points-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
    font-size: 1.15rem;
    line-height: 1.7;
    margin-top: 20px;
}

.slide-points-list li {
    padding-right: 24px;
    position: relative;
}

.slide-points-list li::before {
    content: "◀";
    position: absolute;
    right: 0;
    color: var(--primary);
    font-size: 0.9rem;
}

.pres-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 30px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
}

.pres-nav-btns {
    display: flex;
    gap: 12px;
}

/* ===================================================
   Footer
   =================================================== */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px 0;
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1.3fr;
    gap: 36px;
    padding-bottom: 40px;
}

@media (max-width: 768px) {
    .footer-container {
        grid-template-columns: 1fr;
    }
}

.footer-brand h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links h4, .footer-credits h4 {
    font-size: 1.05rem;
    margin-bottom: 16px;
    color: var(--primary-light);
}

.footer-links ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--primary-light);
}

.footer-credits p {
    font-size: 0.88rem;
    line-height: 1.6;
    margin-bottom: 10px;
}

.copyright-tag {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ===================================================
   Print Media Styling (For School Submission & PDF)
   =================================================== */
@media print {
    body {
        background: #ffffff !important;
        color: #000000 !important;
    }

    .navbar, .scroll-progress, .hero-section, #baseline-intro, #health-fitness,
    #skill-fitness, #analysis-fitt, #video-library, #interactive-lab,
    #quiz-section, #discussion-bank, #flip-cards-section, #matching-game-section,
    .footer, .card-controls, .presentation-overlay, .mode-switch-btn, .sound-toggle-btn {
        display: none !important;
    }

    #project-card {
        padding: 0 !important;
        display: block !important;
    }

    .official-card {
        border: 2px solid #000000 !important;
        box-shadow: none !important;
        background: #ffffff !important;
        color: #000000 !important;
        padding: 20px !important;
        page-break-inside: avoid;
    }

    .editable-input, .field-static-val, .table-input {
        border: 1px solid #777777 !important;
        background: #ffffff !important;
        color: #000000 !important;
    }

    .official-card::before {
        display: none;
    }
}