/* =============================================
   FLEXCAMPUS - STYLES PRINCIPAUX
   Couleurs de marque FlexCampus
   ============================================= */

:root {
    /* Couleurs Primaires - Bleu Marine */
    --primary: #0d3865;
    --primary-dark: #092847;
    --primary-light: #1a4a7a;

    /* Couleurs Secondaires - Cyan/Turquoise */
    --secondary: #6dcbdd;
    --secondary-light: #8ed8e6;
    --secondary-dark: #4fb8cc;

    /* Couleurs Fonctionnelles */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;

    /* Couleurs de Base */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;

    /* Alias sémantiques */
    --bg-primary: var(--gray-50);
    --bg-secondary: var(--white);
    --bg-tertiary: var(--gray-100);
    --bg-dark: var(--primary);

    --text-primary: var(--gray-800);
    --text-secondary: var(--gray-600);
    --text-muted: var(--gray-500);
    --text-light: var(--white);

    --border: var(--gray-200);
    --border-light: var(--gray-300);

    /* Layout */
    --sidebar-width: 280px;
    --header-height: 80px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(13, 56, 101, 0.05);
    --shadow: 0 4px 6px -1px rgba(13, 56, 101, 0.1), 0 2px 4px -1px rgba(13, 56, 101, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(13, 56, 101, 0.1), 0 4px 6px -2px rgba(13, 56, 101, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(13, 56, 101, 0.1), 0 10px 10px -5px rgba(13, 56, 101, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(13, 56, 101, 0.25);
    --shadow-glow: 0 0 30px rgba(109, 203, 221, 0.3);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* =============================================
   ANIMATIONS KEYFRAMES
   ============================================= */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-5px) rotate(1deg); }
    75% { transform: translateY(5px) rotate(-1deg); }
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes ripple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

/* =============================================
   LAYOUT
   ============================================= */

.app {
    display: flex;
    min-height: 100vh;
    animation: fadeIn var(--transition-slow);
}

/* =============================================
   SIDEBAR
   ============================================= */

.sidebar {
    width: var(--sidebar-width);
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dark) 100%);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    box-shadow: var(--shadow-lg);
}

.sidebar-header {
    padding: 28px 24px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeInLeft var(--transition-slow);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 32px;
    animation: bounce 2s ease-in-out infinite;
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--white) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-nav {
    flex: 1;
    padding: 20px 16px;
    overflow-y: auto;
}

/* Custom scrollbar for sidebar */
.sidebar-nav::-webkit-scrollbar {
    width: 6px;
}

.sidebar-nav::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.nav-item::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(109, 203, 221, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width var(--transition-slow), height var(--transition-slow);
}

.nav-item:hover::before {
    width: 300px;
    height: 300px;
}

.nav-item:hover {
    color: var(--white);
    transform: translateX(5px);
}

.nav-item.active {
    background: var(--secondary);
    color: var(--primary-dark);
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(109, 203, 221, 0.4);
}

.nav-item.active::before {
    display: none;
}

.nav-icon {
    font-size: 20px;
    transition: transform var(--transition-base);
}

.nav-item:hover .nav-icon {
    transform: scale(1.2);
}

.nav-section {
    margin-top: 28px;
    animation: fadeInLeft var(--transition-slow) 0.2s both;
}

.nav-section-title {
    display: block;
    padding: 8px 18px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.4);
    letter-spacing: 1px;
}

.theme-nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 18px;
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    font-size: 14px;
}

.theme-nav-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    padding-left: 24px;
}

.theme-nav-item.active {
    background: rgba(109, 203, 221, 0.2);
    color: var(--secondary);
}

.theme-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.theme-nav-item:hover .theme-dot {
    transform: scale(1.3);
    box-shadow: 0 0 10px currentColor;
}

.sidebar-footer {
    padding: 20px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.1);
}

.student-code label {
    display: block;
    font-size: 11px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.student-code input {
    width: 100%;
    padding: 12px 14px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    color: var(--white);
    font-size: 14px;
    font-family: 'JetBrains Mono', monospace;
    transition: all var(--transition-base);
}

.student-code input::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.student-code input:focus {
    outline: none;
    border-color: var(--secondary);
    background: rgba(255, 255, 255, 0.15);
    box-shadow: 0 0 20px rgba(109, 203, 221, 0.3);
}

/* =============================================
   MAIN CONTENT
   ============================================= */

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 40px;
    min-height: 100vh;
    background: var(--bg-primary);
}

.content-header {
    margin-bottom: 40px;
    animation: fadeInUp var(--transition-slow);
}

.content-header h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.content-header p {
    color: var(--text-secondary);
    font-size: 18px;
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    margin-bottom: 20px;
    transition: all var(--transition-base);
}

.btn-back:hover {
    border-color: var(--secondary);
    color: var(--primary);
    transform: translateX(-5px);
    box-shadow: var(--shadow);
}

/* =============================================
   VIEWS
   ============================================= */

.view {
    display: none;
    animation: fadeIn var(--transition-base);
}

.view.active {
    display: block;
}

/* =============================================
   THEMES GRID
   ============================================= */

.themes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 28px;
}

.theme-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    animation: fadeInUp var(--transition-slow) calc(var(--card-index, 0) * 100ms) both;
}

.theme-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: var(--theme-color, var(--secondary));
    transition: height var(--transition-base);
}

.theme-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--theme-color, var(--secondary)) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.theme-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.theme-card:hover::before {
    height: 100%;
    opacity: 0.1;
}

.theme-card:hover::after {
    opacity: 0.05;
}

.theme-icon {
    font-size: 48px;
    margin-bottom: 20px;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
    transition: transform var(--transition-base);
}

.theme-card:hover .theme-icon {
    transform: scale(1.2) rotate(5deg);
}

.theme-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
    transition: color var(--transition-base);
}

.theme-card:hover h3 {
    color: var(--primary);
}

.theme-card p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
    line-height: 1.7;
}

.theme-stats {
    display: flex;
    gap: 20px;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.theme-stats span {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* =============================================
   EXERCISES LIST
   ============================================= */

.exercises-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.exercise-card {
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    padding: 24px;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideInRight var(--transition-slow) calc(var(--card-index, 0) * 80ms) both;
    position: relative;
    overflow: hidden;
}

.exercise-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--secondary);
    transform: scaleY(0);
    transition: transform var(--transition-base);
}

.exercise-card:hover {
    border-color: var(--secondary);
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.exercise-card:hover::before {
    transform: scaleY(1);
}

.exercise-info h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
    transition: color var(--transition-base);
}

.exercise-card:hover .exercise-info h3 {
    color: var(--primary);
}

.exercise-info p {
    color: var(--text-secondary);
    font-size: 14px;
}

.exercise-meta {
    display: flex;
    align-items: center;
    gap: 16px;
}

.badge {
    padding: 6px 14px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: transform var(--transition-base);
}

.badge:hover {
    transform: scale(1.05);
}

.badge.debutant,
.badge.débutant {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(16, 185, 129, 0.25) 100%);
    color: var(--success);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge.intermediaire,
.badge.intermédiaire {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15) 0%, rgba(245, 158, 11, 0.25) 100%);
    color: var(--warning);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.badge.avance,
.badge.avancé {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15) 0%, rgba(239, 68, 68, 0.25) 100%);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.exercise-icons {
    display: flex;
    gap: 10px;
    font-size: 20px;
}

.exercise-icons span {
    transition: transform var(--transition-bounce);
}

.exercise-card:hover .exercise-icons span {
    animation: bounce 0.5s ease;
}

/* =============================================
   EXERCISE VIEW
   ============================================= */

.exercise-tabs {
    display: flex;
    gap: 8px;
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border);
}

.tab {
    padding: 14px 28px;
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.tab::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--secondary);
    transform: translateX(-50%);
    transition: width var(--transition-base);
}

.tab:hover {
    border-color: var(--secondary-light);
    color: var(--primary);
}

.tab:hover::before {
    width: 60%;
}

.tab.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-color: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.tab.active::before {
    display: none;
}

.tab-content {
    display: none;
    animation: fadeInUp var(--transition-base);
}

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

/* =============================================
   MARKDOWN CONTENT
   ============================================= */

.markdown-content {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    line-height: 1.9;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.markdown-content h1 {
    font-size: 32px;
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 3px solid var(--secondary);
    color: var(--primary);
}

.markdown-content h2 {
    font-size: 24px;
    margin-top: 40px;
    margin-bottom: 16px;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.markdown-content h2::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--secondary);
    border-radius: 2px;
}

.markdown-content h3 {
    font-size: 20px;
    margin-top: 32px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.markdown-content p {
    margin-bottom: 18px;
    color: var(--text-secondary);
}

.markdown-content code {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    padding: 3px 10px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 14px;
    color: var(--primary);
    border: 1px solid var(--border);
}

.markdown-content pre {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    border-radius: var(--radius-md);
    padding: 24px;
    overflow-x: auto;
    margin: 24px 0;
    box-shadow: var(--shadow-md);
    position: relative;
}

.markdown-content pre::before {
    content: '';
    position: absolute;
    top: 12px;
    left: 16px;
    display: flex;
    gap: 8px;
}

.markdown-content pre code {
    background: transparent;
    padding: 0;
    color: var(--gray-100);
    border: none;
}

.markdown-content ul,
.markdown-content ol {
    margin: 20px 0;
    padding-left: 28px;
    color: var(--text-secondary);
}

.markdown-content li {
    margin-bottom: 10px;
    position: relative;
}

.markdown-content li::marker {
    color: var(--secondary);
}

/* =============================================
   LAB CONTAINER
   ============================================= */

.lab-container {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.lab-controls {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border);
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    display: inline-flex;
    align-items: center;
    gap: 10px;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary) 0%, var(--secondary-dark) 100%);
    color: var(--primary-dark);
    box-shadow: 0 4px 15px rgba(109, 203, 221, 0.4);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(109, 203, 221, 0.5);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    color: var(--white);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.5);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

.lab-status {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.lab-status::before {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--gray-400);
}

.lab-status.running::before {
    background: var(--success);
    animation: pulse 1.5s ease-in-out infinite;
    box-shadow: 0 0 10px var(--success);
}

.lab-status.starting::before {
    background: var(--warning);
    animation: pulse 0.8s ease-in-out infinite;
}

.vnc-container {
    background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.vnc-container:hover {
    border-color: var(--secondary);
}

.vnc-placeholder {
    color: var(--text-muted);
    font-size: 16px;
    text-align: center;
}

/* =============================================
   LOADING
   ============================================= */

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(248, 250, 252, 0.95);
    backdrop-filter: blur(10px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 20px;
    z-index: 1000;
}

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

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border);
    border-top-color: var(--secondary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading-overlay p {
    color: var(--text-secondary);
    font-weight: 500;
}

/* =============================================
   CARD STAGGER ANIMATION
   ============================================= */

.themes-grid .theme-card:nth-child(1) { --card-index: 0; }
.themes-grid .theme-card:nth-child(2) { --card-index: 1; }
.themes-grid .theme-card:nth-child(3) { --card-index: 2; }
.themes-grid .theme-card:nth-child(4) { --card-index: 3; }
.themes-grid .theme-card:nth-child(5) { --card-index: 4; }
.themes-grid .theme-card:nth-child(6) { --card-index: 5; }

.exercises-list .exercise-card:nth-child(1) { --card-index: 0; }
.exercises-list .exercise-card:nth-child(2) { --card-index: 1; }
.exercises-list .exercise-card:nth-child(3) { --card-index: 2; }
.exercises-list .exercise-card:nth-child(4) { --card-index: 3; }
.exercises-list .exercise-card:nth-child(5) { --card-index: 4; }
.exercises-list .exercise-card:nth-child(6) { --card-index: 5; }
.exercises-list .exercise-card:nth-child(7) { --card-index: 6; }
.exercises-list .exercise-card:nth-child(8) { --card-index: 7; }

/* =============================================
   RESPONSIVE
   ============================================= */

@media (max-width: 1024px) {
    .themes-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-base);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
    }

    .themes-grid {
        grid-template-columns: 1fr;
    }

    .content-header h1 {
        font-size: 28px;
    }

    .exercise-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    .exercise-meta {
        width: 100%;
        justify-content: space-between;
    }
}

/* =============================================
   HOVER GLOW EFFECTS
   ============================================= */

.theme-card:hover,
.exercise-card:hover,
.btn:hover {
    --glow-color: var(--secondary);
}

/* =============================================
   SCROLLBAR STYLES
   ============================================= */

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* =============================================
   SELECTION STYLES
   ============================================= */

::selection {
    background: var(--secondary);
    color: var(--primary-dark);
}