/* ==========================================================================
   CSS STYLESHEET - MATHS ET PHYSIQUES
   Aesthetic: Premium, Dark-First Modern Web UI, Glassmorphism, Vibrancy
   ========================================================================== */

/* Color Tokens & System Variables */
:root {
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    /* Theme: Premium Emerald Green Color Palette */
    --bg-main: #F4F7F5;                 /* Main Background (soft green-gray) */
    --bg-surface: rgba(6, 78, 59, 0.9);  /* Primary Green (translucent header base) */
    --bg-surface-solid: #FAFBFA;        /* Card Background */
    --bg-surface-hover: #F4F7F5;        /* Hover background for dropdown items */
    --bg-card: rgba(250, 251, 250, 0.7);     /* Translucent card background */
    --bg-card-hover: #FAFBFA;
    
    --border-color: #E5E7EB;            /* Borders/Dividers */
    --border-color-hover: rgba(6, 78, 59, 0.12);
    
    --primary: #064E3B;                 /* Primary: Dark Emerald Green */
    --primary-glow: rgba(6, 78, 59, 0.08);
    --primary-hover: #065F46;           /* Secondary Green for primary hover */
    
    --secondary: #065F46;               /* Secondary: hover states, secondary buttons, active elements */
    --secondary-glow: rgba(6, 95, 70, 0.08);
    --secondary-hover: #044332;         /* Darker green for hover */
    
    --accent: #C6E533;                  /* Accent Lime: highlights, active states, call-to-actions, badges */
    --accent-glow: rgba(198, 229, 51, 0.15);
    --accent-hover: #b2cf2e;            /* Darker lime for active hover */
    
    --text-primary: #1e293b;            /* Primary Text: Slate 800 */
    --text-secondary: #475569;          /* Secondary Text: Slate 600 */
    --text-muted: #64748b;              /* Muted Text: Slate 500 */
    
    --success: #065F46;                 /* Secondary Green for success/verification states */
    --success-glow: rgba(6, 95, 70, 0.08);
    
    --danger: #EF4444;                  /* Red for danger/errors/destructive actions */
    --danger-glow: rgba(239, 68, 68, 0.1);
    
    --glass-blur: blur(12px);
    --shadow-sm: 0 1px 2px 0 rgba(6, 78, 59, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(6, 78, 59, 0.04), 0 2px 4px -1px rgba(6, 78, 59, 0.02);
    --shadow-lg: 0 10px 15px -3px rgba(6, 78, 59, 0.06), 0 4px 6px -2px rgba(6, 78, 59, 0.03);
    --shadow-glow: 0 0 25px rgba(198, 229, 51, 0.15);
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   RESET & BASE STYLES
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.5;
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* Background glows */
.glow-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
}

.glow-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.04;
    transition: opacity var(--transition-normal);
}

.orb-1 {
    top: -10%;
    right: 10%;
    width: 50vw;
    height: 50vw;
    background: var(--primary);
}

.orb-2 {
    bottom: -20%;
    left: -10%;
    width: 60vw;
    height: 60vw;
    background: var(--secondary);
}

.orb-3 {
    top: 40%;
    left: 45%;
    width: 30vw;
    height: 30vw;
    background: var(--accent);
    opacity: 0.1;
}

/* ==========================================================================
   SCROLLBAR
   ========================================================================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-main);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color-hover);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ==========================================================================
   TYPOGRAPHY & UTILITIES
   ========================================================================== */
.accent-text {
    color: inherit;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    border-radius: 9999px;
    font-size: 0.8rem;
    font-weight: 700;
    background: var(--primary-glow);
    border: 1px solid rgba(6, 78, 59, 0.18);
    color: var(--primary);
    width: fit-content;
}

.badge-accent {
    background: var(--accent-glow);
    border-color: rgba(6, 78, 59, 0.15);
    color: var(--primary);
}

.success-color { color: var(--success); }
.xp-color { color: #d97706; }
.math-color { background-color: rgba(6, 78, 59, 0.1); color: var(--primary); }
.physics-color { background-color: rgba(6, 95, 70, 0.1); color: var(--secondary); }

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 12px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 0 15px rgba(6, 78, 59, 0.35);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--secondary);
    color: var(--secondary);
}
.btn-secondary:hover {
    background-color: var(--secondary);
    color: #ffffff;
    box-shadow: 0 0 15px rgba(6, 95, 70, 0.25);
    transform: translateY(-1px);
}

.btn-accent {
    background: var(--accent);
    color: var(--primary);
    border: 1px solid rgba(6, 78, 59, 0.1);
}
.btn-accent:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 20px rgba(198, 229, 51, 0.35);
    transform: translateY(-1px);
}

.btn-block {
    width: 100%;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ==========================================================================
   HEADER NAVIGATION
   ========================================================================== */
.main-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--primary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 4px 30px rgba(17, 24, 39, 0.05);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
    cursor: pointer;
    color: #ffffff;
}

.logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 9999px;
    text-decoration: none;
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.nav-link:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.12);
}

.nav-link.active {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.22);
}

/* User Contact Button Styling in header */
#userProfileBtn {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.12);
    padding: 8px 16px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-weight: 600;
    color: #ffffff;
    transition: all var(--transition-fast);
}

#userProfileBtn:hover {
    background: rgba(255, 255, 255, 0.22);
    border-color: rgba(255, 255, 255, 0.35);
    transform: translateY(-1px);
}

#userProfileBtn .mail-icon {
    width: 16px;
    height: 16px;
    color: #ffffff;
}

.nav-link.premium-btn {
    background: linear-gradient(135deg, rgba(6, 78, 59, 0.08), rgba(198, 229, 51, 0.08));
    color: #000000;
    border: 1px solid rgba(6, 78, 59, 0.15);
}

.nav-link.premium-btn:hover {
    background: linear-gradient(135deg, rgba(6, 78, 59, 0.15), rgba(198, 229, 51, 0.15));
    border-color: rgba(6, 78, 59, 0.3);
}

.nav-link.premium-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    border-color: transparent;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background-color: transparent;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--border-color);
    border-color: var(--border-color-hover);
    transform: scale(1.05);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 3px 12px 3px 3px;
    border-radius: 9999px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-profile:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-hover);
    transform: translateY(-1px);
}

.user-profile.premium-active {
    border-color: rgba(6, 95, 70, 0.3);
    box-shadow: 0 0 12px rgba(6, 95, 70, 0.15);
}

.avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.user-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ==========================================================================
   MAIN LAYOUT & GENERAL WRAPPER
   ========================================================================== */
.content-wrapper {
    max-width: 1280px;
    margin: 0 auto;
    padding: 40px 24px;
    min-height: calc(100vh - 250px);
}

.tab-content {
    display: none;
    animation: fadeIn 0.4s ease forwards;
}

.tab-content.active {
    display: block;
}

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

/* ==========================================================================
   SECTION 1: HOME / HERO SECTION
   ========================================================================== */
.hero-card {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 40px;
    padding: 48px 56px;
    border-radius: 24px;
    background: linear-gradient(135deg, var(--bg-surface), rgba(243, 244, 246, 0.4));
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(6, 78, 59, 0.02);
    margin-bottom: 48px;
    position: relative;
    overflow: hidden;
}

.hero-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 16px;
    z-index: 2;
}

.hero-text h1 {
    font-size: 2.6rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.hero-text p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.5;
    max-width: 540px;
}

.hero-search {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 8px 8px 8px 16px;
    border-radius: 16px;
    margin-top: 10px;
    transition: all var(--transition-fast);
}

.hero-search:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 15px rgba(6, 78, 59, 0.2);
}

.hero-search i {
    color: var(--text-muted);
}

.hero-search input {
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    width: 100%;
}

.hero-search button {
    background-color: var(--primary);
    color: #ffffff;
    border: none;
    padding: 10px 24px;
    border-radius: 10px;
    font-family: var(--font-heading);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast);
}

.hero-search button:hover {
    background-color: var(--primary-hover);
}

.quick-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin-top: 15px;
}

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

.stat-number {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--text-primary);
}

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

/* Hero Illustration Graphics */
.hero-illustration {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

.math-card, .physics-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: 16px;
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    width: 260px;
}

.math-card {
    top: 15%;
    left: 0;
}

.physics-card {
    bottom: 20%;
    right: 0;
}

.card-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-info h4 {
    font-size: 0.95rem;
    font-weight: 700;
}

.card-info p {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.interactive-glow-card {
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(198, 229, 51, 0.2) 0%, transparent 70%);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: rotate 15s linear infinite;
}

.glow-inner {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 9999px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.glow-icon {
    color: #000000;
}

/* Floating animations */
@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.float-anim-1 {
    animation: float1 6s ease-in-out infinite;
}

.float-anim-2 {
    animation: float2 6s ease-in-out infinite;
    animation-delay: 1.5s;
}

@keyframes float1 {
    0%, 100% { transform: translateY(0px) rotate(-1deg); }
    50% { transform: translateY(-10px) rotate(1deg); }
}

@keyframes float2 {
    0%, 100% { transform: translateY(0px) rotate(1deg); }
    50% { transform: translateY(-8px) rotate(-1deg); }
}

/* ==========================================================================
   LEVEL SELECTOR SECTION
   ========================================================================== */
.section-title {
    margin-bottom: 24px;
}

.section-title h2 {
    font-size: 1.8rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-top: 4px;
}

.level-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 50px;
}

.level-group-card {
    padding: 24px;
    border-radius: 16px;
    background: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), border-color var(--transition-normal);
}

.level-group-card:hover {
    border-color: var(--border-color-hover);
}

.level-group-card h3 {
    font-size: 1.15rem;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.group-icon {
    width: 32px;
    height: 32px;
    padding: 6px;
    border-radius: 8px;
}

.lycée-color, .lycee-color { background-color: rgba(6, 78, 59, 0.1); color: var(--primary); }
.collège-color, .college-color { background-color: rgba(6, 95, 70, 0.1); color: var(--secondary); }

.level-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.level-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 8px 16px;
    border-radius: 9999px;
    font-family: var(--font-body);
    font-weight: 500;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
}

.level-btn:hover {
    background-color: var(--bg-card-hover);
    color: var(--text-primary);
    border-color: var(--border-color-hover);
    transform: translateY(-1px);
}

.level-btn.active {
    background-color: var(--secondary);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 4px 12px rgba(6, 95, 70, 0.2);
}

/* ==========================================================================
   PROGRESS TRACKER SECTION (DASHBOARD)
   ========================================================================== */
.progress-section {
    padding: 24px;
    border-radius: 16px;
    background: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    margin-bottom: 48px;
    transition: border-color var(--transition-normal);
}

.progress-section:hover {
    border-color: var(--border-color-hover);
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.progress-header h3 {
    font-size: 1.15rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.progress-header p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.reset-progress-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
}

.reset-progress-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: var(--accent-glow);
}

.progress-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 20px;
}

.prog-stat-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border-radius: 12px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: border-color var(--transition-fast);
}

.prog-stat-card:hover {
    border-color: var(--border-color-hover);
}

.prog-stat-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-glow);
    color: #000000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.prog-stat-card:nth-child(2) .prog-stat-icon {
    background-color: var(--secondary-glow);
    color: #000000;
}

.prog-stat-card:nth-child(3) .prog-stat-icon {
    background-color: rgba(245, 158, 11, 0.1);
    color: #000000;
}

.prog-stat-detail {
    display: flex;
    flex-direction: column;
}

.prog-num {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 800;
    line-height: 1.1;
}

.prog-lbl {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.recent-activity h4 {
    font-size: 0.9rem;
    color: var(--text-primary);
    margin-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 6px;
}

.activity-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.activity-list li {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.activity-list li i {
    width: 14px;
    height: 14px;
    color: var(--text-secondary);
}

.activity-list li i[data-lucide="check"] {
    color: var(--success);
}

.activity-list li i[data-lucide="award"] {
    color: #d97706;
}

.activity-list li i[data-lucide="sparkles"] {
    color: var(--primary);
}

.empty-activity {
    color: var(--text-muted) !important;
    font-style: italic;
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
}

/* ==========================================================================
   SECTION 2: COURSES & FILTER BAR
   ========================================================================== */
.filter-bar {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 20px;
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 16px;
    margin-bottom: 16px;
    box-shadow: var(--shadow-sm);
}

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

.filter-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.filter-group select {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.filter-group select:focus {
    border-color: var(--primary);
}

.search-group {
    position: relative;
    justify-content: flex-end;
}

.search-group input {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 10px 16px 10px 42px;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    width: 100%;
}

.search-group i {
    position: absolute;
    left: 14px;
    bottom: 12px;
    color: var(--text-muted);
}

.active-filters-row {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
}

.filter-badge {
    background-color: var(--border-color);
    border: 1px solid var(--border-color-hover);
    padding: 4px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.filter-badge strong {
    color: var(--text-primary);
}

/* Chapters grid and cards */
.chapters-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.chapter-card {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 200px;
}

.chapter-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-color-hover);
    box-shadow: var(--shadow-md);
}

.chapter-card.math-theme:hover {
    box-shadow: 0 10px 25px -5px rgba(6, 78, 59, 0.15);
    border-color: rgba(6, 78, 59, 0.3);
}

.chapter-card.pc-theme:hover {
    box-shadow: 0 10px 25px -5px rgba(6, 95, 70, 0.15);
    border-color: rgba(6, 95, 70, 0.3);
}

.chapter-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 16px;
}

.chapter-subject-badge {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.math-badge { background-color: rgba(6, 78, 59, 0.1); color: var(--primary); }
.pc-badge { background-color: rgba(6, 95, 70, 0.1); color: var(--secondary); }

.mastered-badge {
    background-color: rgba(6, 95, 70, 0.1);
    color: var(--success);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.chapter-card h4 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.3;
}

.chapter-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 20px;
    flex-grow: 1;
}

.chapter-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 14px;
}

.chapter-resources-info {
    display: flex;
    gap: 12px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.chapter-resources-info span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.chapter-resources-info i {
    width: 12px;
    height: 12px;
}

.read-btn {
    background-color: var(--border-color);
    border: none;
    color: var(--text-primary);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.chapter-card:hover .read-btn {
    background-color: var(--primary);
    color: #ffffff;
}

/* ==========================================================================
   LESSON DETAIL MODAL (MODAL)
   ========================================================================== */
.lesson-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}

.lesson-modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    width: 100%;
    height: 100%;
    background-color: rgba(8, 11, 17, 0.8);
    backdrop-filter: blur(10px);
}

.modal-card {
    position: relative;
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 900px;
    height: 85vh;
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 1001;
    animation: modalSlide 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes modalSlide {
    from { opacity: 0; transform: scale(0.95) translateY(20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-badge {
    background-color: var(--primary-glow);
    color: var(--primary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
}

.modal-title-wrapper h3 {
    font-size: 1.4rem;
    margin-top: 6px;
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.modal-tabs {
    background-color: rgba(255, 255, 255, 0.02);
    display: flex;
    border-bottom: 1px solid var(--border-color);
    padding: 0 16px;
}

.modal-tab-btn {
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    padding: 14px 20px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-fast);
}

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

.modal-tab-btn.active {
    color: #000000;
    border-bottom-color: var(--primary);
}

.modal-body {
    flex-grow: 1;
    overflow-y: auto;
    padding: 30px;
}

.modal-tab-content {
    display: none;
}

.modal-tab-content.active {
    display: block;
}

/* Course Summaries Styles */
.course-text-content {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.course-text-content h4 {
    color: var(--text-primary);
    font-size: 1.15rem;
    margin: 20px 0 10px;
}

.course-text-content p {
    margin-bottom: 14px;
    line-height: 1.6;
}

.course-text-content ul {
    margin-left: 20px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.math-formula {
    display: block;
    background-color: rgba(255, 255, 255, 0.02);
    border-left: 3px solid var(--primary);
    padding: 12px 16px;
    margin: 16px 0;
    font-family: 'Courier New', Courier, monospace;
    font-weight: 700;
    color: var(--text-primary);
    border-radius: 0 8px 8px 0;
}

.physics-formula {
    border-left-color: var(--secondary);
}

.pdf-mock-downloader {
    margin-top: 30px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.pdf-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.pdf-icon {
    width: 48px;
    height: 48px;
    padding: 10px;
    border-radius: 12px;
    background-color: rgba(239, 68, 68, 0.1);
    color: #000000;
}

.pdf-info h5 {
    font-size: 1rem;
}

.pdf-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Exercises toggle accordion style */
.exercises-wrapper {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.exercise-item {
    background-color: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.ex-header {
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    background-color: rgba(255, 255, 255, 0.02);
}

.ex-title {
    font-weight: 700;
    font-size: 0.95rem;
}

.ex-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
}

.ex-body {
    padding: 20px;
    border-top: 1px solid var(--border-color);
}

.ex-statement {
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.ex-solution {
    background-color: rgba(6, 95, 70, 0.03);
    border: 1px dashed rgba(6, 95, 70, 0.3);
    padding: 16px 20px;
    border-radius: 8px;
    margin-top: 16px;
}

.ex-solution h5 {
    color: var(--primary);
    margin-bottom: 8px;
}

/* Exams list style */
.exams-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.exam-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.exam-details h5 {
    font-size: 0.95rem;
}

.exam-details p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.01);
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-container input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.checkbox-container label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
}

.checkbox-container label i {
    width: 14px;
    height: 14px;
    color: var(--success);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.checkbox-container input:checked + label {
    color: var(--text-primary);
}

.checkbox-container input:checked + label i {
    opacity: 1;
}

/* ==========================================================================
   SECTION 3: INTERACTIVE QUIZZES
   ========================================================================== */
.quiz-welcome-panel {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 40px;
}

.quiz-welcome-info h2 {
    font-size: 2.2rem;
    margin-top: 8px;
}

.quiz-welcome-info p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin-top: 8px;
}

.quiz-selector-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.quiz-card {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.quiz-card:hover {
    transform: translateY(-3px);
    border-color: rgba(6, 95, 70, 0.4);
    box-shadow: 0 10px 25px -5px rgba(6, 95, 70, 0.12);
}

.quiz-card h3 {
    font-size: 1.15rem;
    margin-bottom: 6px;
}

.quiz-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.quiz-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 14px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.quiz-meta-info {
    display: flex;
    gap: 12px;
}

.quiz-meta-info span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.quiz-action-link {
    font-weight: 700;
    color: #000000;
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Quiz Screen Panel */
.quiz-screen-panel {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    animation: fadeIn 0.4s ease;
}

.quiz-screen-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 30px;
}

.back-to-quizzes-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition-fast);
}

.back-to-quizzes-btn:hover {
    color: var(--text-primary);
}

.quiz-progress-bar-container {
    flex-grow: 1;
    height: 8px;
    border-radius: 9999px;
    background-color: var(--border-color);
    overflow: hidden;
}

.quiz-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 9999px;
    transition: width var(--transition-normal);
}

.quiz-counter {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-muted);
    min-width: 90px;
    text-align: right;
}

.quiz-question-container h3 {
    font-size: 1.4rem;
    margin-bottom: 24px;
    line-height: 1.4;
}

.quiz-formula-box {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 24px;
    text-align: center;
}

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

.option-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 16px 24px;
    border-radius: 12px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition-fast);
}

.option-btn:hover {
    background-color: var(--bg-card-hover);
    border-color: var(--border-color-hover);
    transform: translateY(-1px);
}

.option-btn.selected {
    border-color: var(--primary);
    background-color: var(--primary-glow);
    box-shadow: 0 0 10px rgba(6, 78, 59, 0.1);
}

.option-btn.correct {
    border-color: var(--success);
    background-color: rgba(6, 95, 70, 0.1);
    color: #000000;
}

.option-btn.incorrect {
    border-color: var(--danger);
    background-color: var(--danger-glow);
    color: #000000;
}

/* Feedback panel styles */
.quiz-feedback-box {
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 24px;
    animation: slideDown 0.3s ease forwards;
}

.quiz-feedback-box.correct-box {
    background-color: rgba(6, 95, 70, 0.05);
    border: 1px solid rgba(6, 95, 70, 0.2);
}

.quiz-feedback-box.incorrect-box {
    background-color: var(--danger-glow);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.feedback-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1rem;
    margin-bottom: 6px;
}

.correct-box .feedback-title { color: var(--primary); }
.incorrect-box .feedback-title { color: var(--danger); }

#feedbackExplanationText {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.quiz-screen-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

/* Quiz Result Panel */
.quiz-result-panel {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 50px 40px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    max-width: 550px;
    margin: 0 auto;
    animation: fadeIn 0.5s ease;
}

.result-score-circle {
    width: 140px;
    height: 140px;
    margin: 0 auto 24px;
}

.circular-chart {
    display: block;
    max-width: 100%;
    max-height: 100%;
}

.circle-bg {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 2.8;
}

.circle {
    fill: none;
    stroke-width: 2.8;
    stroke-linecap: round;
    stroke: var(--accent);
    transition: stroke-dasharray 1s ease-in-out;
}

.percentage {
    fill: var(--text-primary);
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 8px;
    text-anchor: middle;
}

.quiz-result-panel h2 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.quiz-result-panel p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 30px;
}

.result-breakdown {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 35px;
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: 16px;
}

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

.breakdown-item .label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.breakdown-item .value {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.25rem;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* ==========================================================================
   SECTION 4: PREMIUM & PRICING
   ========================================================================== */
.premium-hero {
    text-align: center;
    margin-bottom: 50px;
}

.premium-badge-lg {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-radius: 9999px;
    background: linear-gradient(135deg, rgba(6, 78, 59, 0.15), rgba(198, 229, 51, 0.15));
    border: 1px solid rgba(6, 78, 59, 0.3);
    color: #000000;
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.premium-hero h2 {
    font-size: 2.4rem;
    margin-bottom: 12px;
}

.premium-hero p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 750px;
    margin: 0 auto;
}

.premium-features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 60px;
}

.p-feat-card {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    transition: all var(--transition-normal);
}

.p-feat-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-color-hover);
}

.p-feat-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.video-color { background-color: rgba(6, 78, 59, 0.1); color: var(--primary); }
.pdf-color { background-color: rgba(239, 68, 68, 0.1); color: #ef4444; }
.ask-color { background-color: rgba(6, 95, 70, 0.1); color: var(--secondary); }
.live-color { background-color: rgba(245, 158, 11, 0.1); color: #f59e0b; }

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

.p-feat-card p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Pricing Grid */
.pricing-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    max-width: 900px;
    margin: 0 auto 50px;
}

.pricing-card {
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 520px;
}

.pricing-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: var(--border-color);
    color: var(--text-secondary);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
}

.premium-card-glow {
    border-color: rgba(6, 95, 70, 0.4);
    box-shadow: 0 15px 35px -5px rgba(6, 95, 70, 0.15);
}

.premium-card-glow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
}

.badge-annual {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #ffffff;
}

.pricing-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.price {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 8px;
}

.price .currency {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.price .amount {
    font-family: var(--font-heading);
    font-size: 3.2rem;
    font-weight: 800;
    color: var(--text-primary);
    line-height: 1;
}

.price .duration {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.price-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.pricing-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 35px;
    flex-grow: 1;
}

.pricing-list li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.success-icon {
    width: 16px;
    height: 16px;
    color: #000000;
    flex-shrink: 0;
}

/* Checkout simulation styles */
.checkout-modal-card {
    max-width: 500px;
    height: auto;
    max-height: 90vh;
}

.payment-summary {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.payment-summary strong {
    font-size: 1.25rem;
    color: #000000;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}

.form-group label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.form-group input {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 12px 16px;
    border-radius: 10px;
    outline: none;
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.form-group input:focus {
    border-color: var(--primary);
}

.form-row {
    display: flex;
    gap: 16px;
}

.col-8 { flex: 8; }
.col-4 { flex: 4; }

.input-icon-wrapper {
    position: relative;
}

.input-icon-wrapper i {
    position: absolute;
    left: 14px;
    top: 14px;
    width: 18px;
    height: 18px;
    color: var(--text-muted);
}

.input-icon-wrapper input {
    padding-left: 44px;
    width: 100%;
}

.payment-methods-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.pm-option {
    border: 1px solid var(--border-color);
    background-color: var(--bg-main);
    padding: 12px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.pm-option input {
    display: none;
}

.pm-option:hover {
    border-color: var(--border-color-hover);
}

.pm-option.active {
    border-color: var(--primary);
    background-color: var(--primary-glow);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
    background-color: var(--bg-surface-solid);
    border-top: 1px solid var(--border-color);
    padding: 50px 24px;
    margin-top: 40px;
}

.footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
    gap: 40px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    max-width: 280px;
}

.footer-links-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links-group h4 {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.footer-links-group a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-links-group a:hover {
    color: #000000;
}

.site-footer .logo {
    color: var(--text-primary);
}

.site-footer .logo-icon {
    background-color: var(--primary);
    color: #ffffff;
}

.footer-links-group span {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.5;
    margin-top: 10px;
}

/* ==========================================================================
   TOAST NOTIFICATION
   ========================================================================== */
.toast-notification {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background-color: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    padding: 14px 24px;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 2000;
    transform: translateY(100px);
    opacity: 0;
    transition: all var(--transition-normal);
}

.toast-notification.active {
    transform: translateY(0);
    opacity: 1;
}

.toast-notification.success-toast {
    border-color: rgba(6, 95, 70, 0.4);
    box-shadow: 0 10px 25px -5px rgba(6, 95, 70, 0.15);
}

.toast-notification.success-toast i {
    color: #000000;
}

/* Interactive Subjects Sections */
.subjects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 30px 0 50px 0;
}

.subject-section-card {
    background: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.subject-section-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    transition: all var(--transition-normal);
}

.math-section::before {
    background: var(--primary);
}

.physics-section::before {
    background: var(--secondary);
}

.subject-section-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-color-hover);
}

.math-section:hover {
    box-shadow: 0 20px 40px -15px rgba(6, 78, 59, 0.15);
}

.physics-section:hover {
    box-shadow: 0 20px 40px -15px rgba(6, 95, 70, 0.15);
}

.subject-section-header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.subject-icon {
    width: 54px;
    height: 54px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
}

.math-icon-bg {
    background: var(--primary);
    box-shadow: 0 8px 20px -6px rgba(6, 78, 59, 0.4);
}

.physics-icon-bg {
    background: var(--secondary);
    box-shadow: 0 8px 20px -6px rgba(6, 95, 70, 0.4);
}

.subject-title-area h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.subject-subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.subject-section-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Interactive Tool inside Card */
.interactive-tool-box {
    background: rgba(17, 24, 39, 0.03);
    border: 1px solid rgba(17, 24, 39, 0.04);
    border-radius: 14px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: all var(--transition-normal);
}

.interactive-tool-box.collapsed {
    padding: 14px 20px;
    gap: 0;
}

.interactive-tool-box.collapsed .tool-body {
    display: none;
}

.tool-header {
    cursor: pointer;
    user-select: none;
}

.tool-header h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.tool-header h4 span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.tool-chevron {
    width: 16px !important;
    height: 16px !important;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.interactive-tool-box:not(.collapsed) .tool-chevron {
    transform: rotate(180deg);
}

.tool-header p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.tool-body {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Inputs and Forms */
.calc-inputs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

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

.input-field label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.input-field input {
    background: rgba(17, 24, 39, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    width: 100%;
}

.input-field input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.calc-btn {
    width: 100%;
    justify-content: center;
    padding: 10px;
    font-size: 0.85rem;
}

.calc-result {
    background: rgba(17, 24, 39, 0.02);
    border-left: 3px solid var(--primary);
    border-radius: 6px;
    padding: 12px;
    margin-top: 5px;
    font-size: 0.85rem;
    animation: fadeIn 0.3s ease;
}

.physics-section .calc-result {
    border-left-color: var(--secondary);
}

.result-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.result-value {
    font-family: monospace;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.result-explanation {
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Wave Calc specific tabs */
.calc-tabs {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.calc-tab-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-family: var(--font-heading);
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.calc-tab-btn.active {
    color: var(--text-primary);
    background: rgba(17, 24, 39, 0.05);
}

.subject-key-concepts {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.concept-tag {
    background: rgba(17, 24, 39, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 6px 12px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.subject-action-btn {
    margin-top: auto;
    width: 100%;
    justify-content: center;
    gap: 8px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   RESPONSIVE DESIGN (MEDIA QUERIES)
   ========================================================================== */
@media (max-width: 1024px) {
    .hero-card {
        grid-template-columns: 1fr;
        padding: 40px;
    }
    .hero-illustration {
        display: none;
    }
    .premium-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-container {
        grid-template-columns: 1fr 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 16px;
    }
    .nav-links {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    .level-grid {
        grid-template-columns: 1fr;
    }
    .subjects-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .progress-stats-grid {
        grid-template-columns: 1fr;
    }
    .filter-bar {
        grid-template-columns: 1fr;
    }
    .chapters-container {
        grid-template-columns: 1fr;
    }
    .quiz-selector-grid {
        grid-template-columns: 1fr;
    }
    .pricing-container {
        grid-template-columns: 1fr;
    }
    .modal-card {
        height: 95vh;
    }
    .modal-tabs {
        overflow-x: auto;
    }
    .modal-tab-btn {
        padding: 10px 14px;
        font-size: 0.85rem;
    }
    .footer-container {
        grid-template-columns: 1fr;
    }
}

/* ==========================================================================
   USER PROFILE MODAL (INSTAGRAM-STYLE)
   ========================================================================== */
.profile-modal-card {
    max-width: 480px;
    height: auto;
    max-height: 90vh;
}

.profile-modal-body {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.instagram-profile-header {
    display: flex;
    align-items: center;
    gap: 24px;
}

.instagram-avatar-wrapper {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    padding: 3px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: 0 4px 12px rgba(6, 78, 59, 0.2);
}

.instagram-avatar {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    background-color: var(--bg-surface-solid);
    border: 2px solid var(--bg-surface-solid);
}

.instagram-badge {
    position: absolute;
    bottom: -2px;
    right: -2px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--bg-surface-solid);
}

.instagram-badge i {
    width: 12px;
    height: 12px;
}

.instagram-meta {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.instagram-username {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.instagram-link-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary);
    background-color: var(--primary-glow);
    border: 1px solid rgba(6, 78, 59, 0.2);
    padding: 6px 12px;
    border-radius: 6px;
    text-decoration: none;
    transition: all var(--transition-fast);
    width: fit-content;
}

.instagram-link-btn:hover {
    background-color: var(--primary);
    color: #ffffff;
    border-color: transparent;
    transform: translateY(-1px);
}

.instagram-link-btn i {
    width: 12px;
    height: 12px;
}

.instagram-stats {
    display: flex;
    justify-content: space-around;
    padding: 12px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.stat-box {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-val {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-lbl {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.instagram-bio {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background-color: rgba(255, 255, 255, 0.03);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.bio-display-name {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 4px 0;
}

.instagram-bio p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.4;
}

.profile-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 8px;
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background-color: #ef4444;
    color: #ffffff;
}

/* Ensure avatar image is styled correctly in header */
.avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
}

/* ==========================================================================
   NAVIGATION DROPDOWNS (LYCÉE & COLLÈGE)
   ========================================================================== */
.nav-dropdown {
    position: relative;
}

.nav-link.dropdown-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    outline: none;
}

.nav-link.dropdown-toggle:focus {
    outline: none;
}

.nav-dropdown .chevron-icon {
    width: 12px;
    height: 12px;
    transition: transform var(--transition-fast);
}

.nav-dropdown:hover .chevron-icon,
.nav-dropdown.active .chevron-icon {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    display: none;
    background: var(--bg-surface-solid);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    min-width: 240px;
    padding: 8px 0;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    opacity: 0;
    transition: opacity var(--transition-fast) ease, transform var(--transition-fast) ease;
}

/* Make dropdown show on hover or when parent has .active class */
.nav-dropdown:hover .dropdown-menu,
.nav-dropdown.active .dropdown-menu {
    display: block;
    opacity: 1;
    transform: translateX(-50%) translateY(4px);
}

.dropdown-item {
    display: flex;
    align-items: center;
    padding: 10px 18px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all var(--transition-fast);
}

.dropdown-item:hover {
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
    padding-left: 22px;
}


/* ==========================================================================
   MATH2BAC INTEGRATED COURSE STYLES
   ========================================================================== */
.toc {
      background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
      padding: 28px 30px; margin-bottom: 32px;
    }
    .toc-title {
      font-family: 'Playfair Display', serif; font-size: 1.1rem; font-weight: 700;
      color: var(--teal); margin-bottom: 14px; display: flex; align-items: center; gap: 8px;
    }
    .toc-list { list-style: none; }
    .toc-list li { margin-bottom: 6px; }
    .toc-list a {
      font-size: 0.9rem; color: var(--text-mid); text-decoration: none;
      padding: 6px 12px; border-radius: 8px; display: flex; align-items: center; gap: 8px;
      transition: all 0.2s;
    }
    .toc-list a:hover { color: var(--teal); background: rgba(13,115,119,0.05); }
    .toc-num {
      font-family: 'Playfair Display', serif; font-weight: 700; font-size: 0.8rem;
      color: var(--teal); min-width: 24px;
    }

    /* ── SECTION CARDS ── */
    .cours-section {
      background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
      padding: 32px 30px; margin-bottom: 24px;
      scroll-margin-top: 80px;
    }
    .section-label {
      font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
      color: var(--white); background: linear-gradient(135deg, var(--teal), var(--teal-light));
      border-radius: 40px; padding: 4px 14px; display: inline-block; margin-bottom: 14px;
    }
    .section-label.gold-label { background: linear-gradient(135deg, #c87f0a, var(--gold)); }
    .section-label.blue-label { background: linear-gradient(135deg, #0a5c78, #0d7377); }
    .section-label.emerald-label { background: linear-gradient(135deg, #0a6b50, #14a085); }
    .section-label.brown-label { background: linear-gradient(135deg, #9b5a0a, #c87f0a); }
    .section-label.rose-label { background: linear-gradient(135deg, #9b2c5a, #c0507a); }
    .section-label.orange-label { background: linear-gradient(135deg, #c85a0a, #e87a20); }
    .section-label.plum-label { background: linear-gradient(135deg, #6b3a7a, #8e5aaa); }

    .section-heading {
      font-family: 'Playfair Display', serif; font-size: 1.4rem; font-weight: 700;
      color: var(--text-dark); margin-bottom: 20px; line-height: 1.3;
    }
    .section-heading em { font-style: italic; font-weight: 400; }

    /* ── SUB-HEADINGS ── */
    .sub-heading {
      font-family: 'Playfair Display', serif; font-size: 1.1rem; font-weight: 700;
      color: var(--teal-dark); margin: 28px 0 14px; padding-bottom: 6px;
      border-bottom: 2px solid rgba(13,115,119,0.1);
    }

    /* ── DEFINITION / THEOREM / PROPERTY BOXES ── */
    .box {
      border-radius: 12px; padding: 18px 20px; margin: 16px 0;
      line-height: 1.8; font-size: 0.94rem;
    }
    .box-title {
      font-weight: 700; font-size: 0.82rem; letter-spacing: 0.05em;
      text-transform: uppercase; margin-bottom: 8px; display: flex; align-items: center; gap: 6px;
    }
    .box-def {
      background: rgba(13,115,119,0.06); border-left: 4px solid var(--teal);
    }
    .box-def .box-title { color: var(--teal); }
    .box-thm {
      background: rgba(232,160,32,0.08); border-left: 4px solid var(--gold);
    }
    .box-thm .box-title { color: #b07a10; }
    .box-prop {
      background: rgba(26,122,74,0.06); border-left: 4px solid var(--correct);
    }
    .box-prop .box-title { color: var(--correct); }
    .box-rem {
      background: rgba(108,117,140,0.06); border-left: 4px solid var(--text-light);
    }
    .box-rem .box-title { color: var(--text-mid); }
    .box-example {
      background: rgba(155,44,90,0.05); border-left: 4px solid #9b2c5a;
    }
    .box-example .box-title { color: #9b2c5a; }
    .box-fi {
      background: rgba(192,57,43,0.06); border-left: 4px solid var(--wrong);
    }
    .box-fi .box-title { color: var(--wrong); }

    /* ── MATH TABLES ── */
    .math-table-wrap { overflow-x: auto; margin: 16px 0; -webkit-overflow-scrolling: touch; }
    .math-table {
      width: 100%; border-collapse: collapse; font-size: 0.88rem;
      min-width: 500px;
    }
    .math-table th, .math-table td {
      border: 1px solid rgba(13,115,119,0.15); padding: 10px 12px;
      text-align: center; vertical-align: middle;
    }
    .math-table th {
      background: rgba(13,115,119,0.08); font-weight: 600; color: var(--teal-dark);
    }
    .math-table td { background: var(--white); }
    .fi-cell { background: rgba(192,57,43,0.08) !important; font-weight: 700; color: var(--wrong); }

    /* ── LISTS ── */
    .cours-list { list-style: none; margin: 10px 0; }
    .cours-list li {
      position: relative; padding-left: 20px; margin-bottom: 8px; font-size: 0.94rem;
      line-height: 1.7; color: var(--text-dark);
    }
    .cours-list li::before {
      content: ''; position: absolute; left: 0; top: 10px;
      width: 7px; height: 7px; border-radius: 50%;
      background: var(--teal);
    }

    /* ── 2x2 GRID for theorems ── */
    .grid-2x2 {
      display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 16px 0;
    }
    .grid-2x2 .box { margin: 0; }

    /* ── DIVIDER ── */
    .divider { height: 1px; background: rgba(13,115,119,0.08); margin: 24px 0; }

    /* ── Scroll reveal ── */
    .reveal {
      opacity: 0; transform: translateY(20px);
      transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22,1,0.36,1);
    }
    .reveal.visible { opacity: 1; transform: translateY(0); }

    /* ── MathJax ── */
    mjx-container { font-size: 1.05em !important; }

    /* ── RESPONSIVE ── */
    @media (max-width: 768px) {
      .cours-section { padding: 24px 20px; }
      .toc { padding: 22px 20px; }
      .grid-2x2 { grid-template-columns: 1fr; }
      .chapter-tabs { flex-wrap: wrap; }
    }
    @media (max-width: 480px) {
      .cours-section { padding: 20px 16px; }
      .section-heading { font-size: 1.2rem; }
      .sub-heading { font-size: 1rem; }
      .box { padding: 14px 16px; }
      .math-table { font-size: 0.8rem; }
      .math-table th, .math-table td { padding: 7px 8px; }
    }

    @keyframes slideUp { from{opacity:0;transform:translateY(30px)} to{opacity:1;transform:translateY(0)} }
    @keyframes fadeIn { from{opacity:0} to{opacity:1} }

/* ==========================================================================
   ANIMATIONS LAB MODULE STYLES
   ========================================================================== */
.animations-container {
    display: flex;
    gap: 30px;
    margin-top: 20px;
    min-height: 600px;
}

.animations-sidebar {
    width: 320px;
    flex-shrink: 0;
    background: var(--bg-glass, rgba(255, 255, 255, 0.03));
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    border-radius: var(--radius-lg, 16px);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.animations-sidebar-header h2 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-primary, #ffffff);
    margin: 8px 0;
}

.animations-sidebar-header p {
    font-size: 0.82rem;
    color: var(--text-secondary, #94a3b8);
    line-height: 1.4;
}

.animation-selector-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.anim-select-btn {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    border-radius: 12px;
    color: var(--text-secondary, #94a3b8);
    text-align: left;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    outline: none;
}

.anim-select-btn:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.15);
    color: var(--text-primary, #ffffff);
    transform: translateY(-2px);
}

.anim-select-btn.active {
    background: linear-gradient(135deg, rgba(6, 78, 59, 0.2), rgba(13, 115, 119, 0.1));
    border-color: var(--teal, #0d7377);
    color: var(--text-primary, #ffffff);
    box-shadow: 0 4px 12px rgba(13, 115, 119, 0.15);
}

.anim-select-btn .btn-icon-wrapper {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.25s;
}

.anim-select-btn.active .btn-icon-wrapper {
    background: var(--teal, #0d7377);
    color: #ffffff;
}

.anim-select-btn .btn-text-wrapper {
    display: flex;
    flex-direction: column;
}

.anim-select-btn .btn-text-wrapper strong {
    font-size: 0.88rem;
    font-weight: 600;
}

.anim-select-btn .btn-text-wrapper span {
    font-size: 0.72rem;
    opacity: 0.8;
}

.animation-display-panel {
    flex-grow: 1;
    background: var(--bg-glass, rgba(255, 255, 255, 0.03));
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    border-radius: var(--radius-lg, 16px);
    padding: 30px;
    display: flex;
    flex-direction: column;
}

.anim-workspace {
    display: none;
    flex-direction: column;
    gap: 24px;
    width: 100%;
}

.anim-workspace.active {
    display: flex;
}

.workspace-header h3 {
    font-family: 'Outfit', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary, #ffffff);
    margin-bottom: 6px;
}

.workspace-header p {
    font-size: 0.9rem;
    color: var(--text-secondary, #94a3b8);
}

.canvas-container {
    background: #0b0f19;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 4px 20px rgba(0, 0, 0, 0.4);
    display: flex;
    justify-content: center;
    align-items: center;
}

.canvas-container canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

.workspace-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.06));
    border-radius: 12px;
    padding: 20px;
    align-items: end;
}

.workspace-controls .control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.workspace-controls label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-mid, #cbd5e1);
}

.workspace-controls input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.workspace-controls input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--teal, #0d7377);
    border: 2px solid #ffffff;
    box-shadow: 0 0 6px rgba(13, 115, 119, 0.5);
    transition: transform 0.1s;
}

.workspace-controls input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.workspace-controls .buttons-group {
    display: flex;
    gap: 10px;
}

.workspace-controls .buttons-group button {
    flex-grow: 1;
    white-space: nowrap;
}

.workspace-theory {
    background: rgba(13, 115, 119, 0.05);
    border-left: 4px solid var(--teal, #0d7377);
    border-radius: 8px;
    padding: 16px 20px;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-primary, #ffffff);
}

/* Custom display settings */
.animations-settings {
    margin-top: 15px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.settings-header {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--teal, #0d7377);
    font-weight: 700;
    font-size: 0.95rem;
}

.settings-header i {
    width: 18px;
    height: 18px;
}

.settings-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.settings-group label {
    font-size: 0.76rem;
    font-weight: 600;
    color: var(--text-secondary, #94a3b8);
}

.color-picker-grid {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.color-btn, .color-btn-sec {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    padding: 0;
    outline: none;
}

.color-btn:hover, .color-btn-sec:hover {
    transform: scale(1.15);
}

.color-btn.active, .color-btn-sec.active {
    border-color: #ffffff;
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
    transform: scale(1.15);
}

/* Responsive animations */
@media (max-width: 992px) {
    .animations-container {
        flex-direction: column;
    }
    .animations-sidebar {
        width: 100%;
    }
}

/* Focométrie styling custom classes */
.focometrie-select {
    background-color: var(--bg-card, #1e293b);
    border: 1px solid var(--border-color, rgba(255,255,255,0.08));
    color: var(--text-primary, #ffffff);
    padding: 10px 16px;
    border-radius: 10px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}
.focometrie-select:focus {
    border-color: var(--primary);
}

/* ==========================================================================
   ANIMATIONS VISUAL GALLERY & CARD GRID STYLES
   ========================================================================== */
.anim-gallery-container {
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
    padding: 10px 0 40px 0;
    animation: fadeIn 0.4s ease;
}

.anim-gallery-header {
    text-align: center;
    margin-bottom: 25px;
}

.anim-gallery-header h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--text-primary, #ffffff);
    margin: 12px 0 8px 0;
}

.anim-gallery-header p {
    color: var(--text-secondary, #94a3b8);
    font-size: 0.95rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Toolbar & Filters */
.anim-gallery-toolbar {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 30px;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    border-radius: 20px;
    padding: 18px;
}

.anim-search-wrapper {
    position: relative;
    width: 100%;
}

.anim-search-wrapper .search-icon {
    position: absolute;
    left: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary, #94a3b8);
    width: 20px;
    height: 20px;
    pointer-events: none;
}

.anim-search-wrapper input {
    width: 100%;
    padding: 14px 20px 14px 50px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: 12px;
    color: #ffffff;
    font-family: var(--font-body);
    font-size: 0.95rem;
    outline: none;
    transition: all 0.3s ease;
}

.anim-search-wrapper input:focus {
    border-color: var(--primary, #10b981);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.25);
    background: rgba(0, 0, 0, 0.5);
}

.anim-category-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

.anim-filter-btn {
    padding: 8px 18px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary, #94a3b8);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
}

.anim-filter-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    transform: translateY(-2px);
}

.anim-filter-btn.active, .recherche-filter-btn.active {
    background: var(--primary, #10b981);
    color: #ffffff;
    border-color: var(--primary, #10b981);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.recherche-filter-btn {
    padding: 8px 18px;
    border-radius: 30px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary, #94a3b8);
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
}

.recherche-filter-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    transform: translateY(-2px);
}

/* Card Grid */
.anim-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}

.anim-card {
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.1));
    border-radius: 16px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
}

.anim-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary, #10b981);
    box-shadow: 0 16px 35px rgba(0, 0, 0, 0.5), 0 0 20px rgba(16, 185, 129, 0.25);
}

.anim-card-img-wrapper {
    position: relative;
    width: 100%;
    height: 135px;
    overflow: hidden;
    background: #0f172a;
}

.anim-card-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.anim-card:hover .anim-card-img-wrapper img {
    transform: scale(1.08);
}

/* Category Badges */
.anim-card-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    font-weight: 700;
    color: #ffffff;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    backdrop-filter: blur(8px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.badge-maths { background: rgba(99, 102, 241, 0.9); }
.badge-optique { background: rgba(56, 189, 248, 0.9); }
.badge-electricite { background: rgba(245, 158, 11, 0.9); }
.badge-electronique { background: rgba(168, 85, 247, 0.9); }
.badge-electrotechnique { background: rgba(16, 185, 129, 0.9); }
.badge-mecanique { background: rgba(239, 68, 68, 0.9); }

.anim-card-content {
    padding: 16px;
    display: flex;
    flex-direction: column;
    flex: 1;
    justify-content: space-between;
}

.anim-card-content h3 {
    font-family: var(--font-heading);
    font-size: 1.22rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 6px;
    line-height: 1.3;
    letter-spacing: -0.01em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.anim-card-content p {
    color: var(--text-secondary, #cbd5e1);
    font-size: 0.83rem;
    line-height: 1.45;
    margin-bottom: 14px;
}

.anim-card-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-top: auto;
    padding-top: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.anim-btn-launch {
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--primary, #10b981);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.anim-card:hover .anim-btn-launch {
    color: #ffffff;
    transform: translateX(4px);
}

/* Top Bar in Player View */
.anim-player-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.08));
    border-radius: 16px;
    margin-bottom: 20px;
}

/* Method Subcards & Dedicated Subpage Navigation */
.method-subcard {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    padding: 18px;
    cursor: pointer;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.method-subcard:hover {
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(56, 189, 248, 0.4);
    transform: translateY(-4px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4), 0 0 15px rgba(56, 189, 248, 0.15);
}

.method-subcard-icon {
    font-size: 1.4rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.method-subcard h4 {
    margin: 0 0 6px 0;
    font-size: 1rem;
    font-weight: 700;
    color: #ffffff;
}

.method-subcard p {
    margin: 0 0 14px 0;
    font-size: 0.8rem;
    color: #94a3b8;
    line-height: 1.4;
    flex-grow: 1;
}

.btn-open-subpage {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--primary, #10b981);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.2s ease, color 0.2s ease;
}

.method-subcard:hover .btn-open-subpage {
    color: #38bdf8;
    gap: 10px;
}