/* ========================================
   GSIDCexam Student Dashboard - Modern CSS
   Dark Glassmorphism Theme
   ======================================== */

/* Root Variables */
:root {
    /* Primary Colors */
    --primary: #FF6B35;
    --primary-dark: #E55A2A;
    --primary-light: #FF8C61;
    
    /* Secondary Colors */
    --secondary: #4A90E2;
    --success: #2ECC71;
    --warning: #F39C12;
    --danger: #E74C3C;
    --purple: #9B59B6;
    --teal: #1ABC9C;
    
    /* Background Colors */
    --bg-dark: #0F0F1E;
    --bg-card: rgba(26, 26, 46, 0.7);
    --bg-card-hover: rgba(26, 26, 46, 0.9);
    --bg-sidebar: rgba(15, 15, 30, 0.95);
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    
    /* Text Colors */
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px rgba(255, 107, 53, 0.3);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Noto Sans Devanagari', sans-serif;
    background: linear-gradient(135deg, #0F0F1E 0%, #1A1A2E 50%, #16213E 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    overflow-x: hidden;
    line-height: 1.6;
}

/* Hindi Text */
.hindi-text {
    font-family: 'Noto Sans Devanagari', sans-serif;
    color: var(--text-secondary);
}

.hindi-small {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

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

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--glass-border);
    padding: var(--spacing-md);
    overflow-y: auto;
    z-index: 1000;
    transition: var(--transition);
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 2rem;
}

.close-sidebar {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
}

.close-sidebar:hover {
    color: var(--primary);
}

/* Sidebar Profile Card */
.sidebar-profile {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.profile-avatar {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-sm);
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 3px solid var(--primary);
}

.level-badge {
    position: absolute;
    bottom: -5px;
    right: -5px;
    background: linear-gradient(135deg, var(--purple), var(--secondary));
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    border: 2px solid var(--bg-dark);
}

.sidebar-profile h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.streak-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, #FF6B35, #F39C12);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.xp-bar {
    background: rgba(255, 255, 255, 0.1);
    height: 8px;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.xp-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--warning));
    border-radius: 10px;
    transition: width 0.5s ease;
}

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

/* Navigation Menu */
.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: var(--spacing-lg);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

.nav-item i {
    font-size: 1.25rem;
    width: 24px;
}

.nav-item:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
}

.nav-item.active {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(243, 156, 18, 0.2));
    color: var(--primary);
    border: 1px solid var(--primary);
}

.nav-item .badge {
    position: absolute;
    right: 1rem;
    background: var(--primary);
    color: white;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-weight: 600;
}

/* Sidebar Footer */
.sidebar-footer {
    margin-top: auto;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
}

.btn-theme-toggle,
.btn-logout {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 0.5rem;
}

.btn-theme-toggle:hover,
.btn-logout:hover {
    background: var(--glass-border);
    color: var(--text-primary);
}

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

.main-content {
    margin-left: 280px;
    padding: var(--spacing-lg);
    min-height: 100vh;
    padding-bottom: 100px;
}

/* Top Header */
.top-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.header-search {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
}

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

.header-search input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    outline: none;
    font-size: 1rem;
}

.header-search input::placeholder {
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

.btn-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.btn-icon:hover {
    background: var(--glass-border);
    transform: translateY(-2px);
}

.notification-dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 10px;
    height: 10px;
    background: var(--danger);
    border-radius: 50%;
    border: 2px solid var(--bg-dark);
}

/* Screen Management */
.screen {
    display: none;
    animation: fadeIn 0.4s ease;
}

.screen.active {
    display: block;
}

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

/* ========================================
   WELCOME BANNER
   ======================================== */

.welcome-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.2), rgba(243, 156, 18, 0.2));
    border: 1px solid var(--primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.welcome-content h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.welcome-content .sub-text {
    color: var(--text-secondary);
    margin-top: var(--spacing-xs);
}

.welcome-illustration {
    font-size: 5rem;
    opacity: 0.3;
}

/* ========================================
   STATS CARDS
   ======================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-lg);
}

.stat-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    font-size: 1.5rem;
}

.stat-icon.blue {
    background: rgba(74, 144, 226, 0.2);
    color: var(--secondary);
}

.stat-icon.green {
    background: rgba(46, 204, 113, 0.2);
    color: var(--success);
}

.stat-icon.orange {
    background: rgba(243, 156, 18, 0.2);
    color: var(--warning);
}

.stat-icon.purple {
    background: rgba(155, 89, 182, 0.2);
    color: var(--purple);
}

.stat-content h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.stat-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* ========================================
   SECTION HEADERS
   ======================================== */

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
}

.section-header h2 i {
    color: var(--primary);
}

.view-all {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.view-all:hover {
    color: var(--primary-light);
}

/* ========================================
   DAILY CHALLENGE CARD
   ======================================== */

.daily-challenge-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.challenge-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--warning), var(--primary));
    border-radius: var(--radius-md);
    font-size: 2.5rem;
}

.challenge-content {
    flex: 1;
}

.challenge-content h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.progress-bar {
    background: rgba(255, 255, 255, 0.1);
    height: 12px;
    border-radius: 10px;
    overflow: hidden;
    margin: var(--spacing-sm) 0;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--warning));
    border-radius: 10px;
    transition: width 0.5s ease;
}

.progress-fill.green {
    background: linear-gradient(90deg, var(--success), var(--teal));
}

.progress-fill.purple {
    background: linear-gradient(90deg, var(--purple), var(--secondary));
}

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

.challenge-reward {
    text-align: center;
}

.reward-badge {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--warning);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.reward-badge i {
    font-size: 2rem;
    color: var(--warning);
}

.reward-badge span {
    font-weight: 700;
    color: var(--warning);
}

/* ========================================
   COURSE CARDS
   ======================================== */

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.course-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
}

.course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.course-card.featured {
    border: 2px solid var(--primary);
    box-shadow: var(--shadow-glow);
}

.course-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    z-index: 10;
}

.course-badge.green {
    background: var(--success);
}

.course-badge.purple {
    background: var(--purple);
}

.course-thumbnail {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.course-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.course-card:hover .course-thumbnail img {
    transform: scale(1.1);
}

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    font-size: 2rem;
    color: white;
    opacity: 0;
    transition: var(--transition);
}

.course-card:hover .play-overlay {
    opacity: 1;
}

.course-content {
    padding: var(--spacing-md);
}

.course-content h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.course-meta {
    display: flex;
    gap: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.progress-bar.thin {
    height: 6px;
    margin: var(--spacing-sm) 0;
}

.btn-continue {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-sm);
}

.btn-continue:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   TWO COLUMN LAYOUT
   ======================================== */

.two-col-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.card h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
}

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

/* Activity Chart */
.activity-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 150px;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.chart-bar {
    flex: 1;
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    position: relative;
    transition: var(--transition);
    cursor: pointer;
}

.chart-bar:hover {
    background: linear-gradient(180deg, var(--primary-light), var(--primary));
}

.chart-bar.active {
    background: linear-gradient(180deg, var(--success), var(--teal));
}

.chart-bar span {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.chart-label {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: var(--spacing-md);
}

/* Leaderboard */
.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: var(--spacing-md);
}

.leaderboard-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.leaderboard-item:hover {
    background: var(--glass-border);
}

.leaderboard-item.you {
    border: 2px solid var(--primary);
    background: rgba(255, 107, 53, 0.1);
}

.rank {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
}

.rank.gold {
    background: linear-gradient(135deg, #FFD700, #FFA500);
    color: #000;
}

.rank.silver {
    background: linear-gradient(135deg, #C0C0C0, #A8A8A8);
    color: #000;
}

.rank.bronze {
    background: linear-gradient(135deg, #CD7F32, #A0522D);
    color: #fff;
}

.leaderboard-item img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--glass-border);
}

.leader-info {
    flex: 1;
}

.leader-info .name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.leader-info .score {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.btn-view-full {
    width: 100%;
    padding: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-view-full:hover {
    background: var(--glass-border);
}

/* ========================================
   ACHIEVEMENTS SECTION
   ======================================== */

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.achievement-badge {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.achievement-badge:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.achievement-badge.earned {
    border-color: var(--success);
    background: rgba(46, 204, 113, 0.1);
}

.achievement-badge.locked {
    opacity: 0.4;
}

.badge-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
}

.achievement-badge p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ========================================
   MY COURSES PAGE
   ======================================== */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.page-header h1 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 2rem;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
}

.filter-tab {
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.filter-tab:hover {
    background: var(--glass-border);
    color: var(--text-primary);
}

.filter-tab.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-color: var(--primary);
    color: white;
}

.courses-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.course-card-detailed {
    display: flex;
    gap: var(--spacing-md);
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    transition: var(--transition);
}

.course-card-detailed:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
}

.course-thumbnail-large {
    position: relative;
    width: 200px;
    height: 150px;
    border-radius: var(--radius-md);
    overflow: hidden;
    flex-shrink: 0;
}

.course-thumbnail-large img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-badge-large {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.9rem;
}

.course-badge-large.green {
    background: var(--success);
}

.course-badge-large.purple {
    background: var(--purple);
}

.course-details {
    flex: 1;
}

.course-header-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.course-header-row h3 {
    font-size: 1.25rem;
}

.btn-icon.favorite {
    background: none;
    border: none;
    color: var(--text-muted);
}

.btn-icon.favorite.active,
.btn-icon.favorite:hover {
    color: var(--danger);
}

.course-stats-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.progress-bar.medium {
    height: 8px;
    margin: var(--spacing-sm) 0;
}

.course-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: var(--spacing-sm);
}

.btn-primary,
.btn-secondary {
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--glass-border);
}

/* ========================================
   COURSE DETAIL PAGE
   ======================================== */

.course-detail-header {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    text-decoration: none;
    margin-bottom: var(--spacing-md);
    transition: var(--transition);
}

.btn-back:hover {
    background: var(--glass-border);
}

.course-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.course-detail-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.course-detail-layout {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: var(--spacing-lg);
}

/* Modules Sidebar */
.modules-sidebar {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    height: fit-content;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    position: sticky;
    top: 20px;
}

.modules-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.modules-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.module-count {
    background: var(--primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.modules-progress {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--glass-border);
}

.modules-progress p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.modules-tree {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.module-section {
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.module-section.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.section-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: var(--spacing-sm);
    background: var(--glass-bg);
    cursor: pointer;
    transition: var(--transition);
}

.section-header:hover {
    background: var(--glass-border);
}

.section-header i {
    color: var(--primary);
    transition: var(--transition);
}

.module-section.expanded .section-header i {
    transform: rotate(90deg);
}

.section-header h4 {
    flex: 1;
    font-size: 0.95rem;
}

.section-progress {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.section-modules {
    display: none;
    flex-direction: column;
}

.module-section.expanded .section-modules {
    display: flex;
}

.module-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem var(--spacing-sm);
    border-top: 1px solid var(--glass-border);
    transition: var(--transition);
    cursor: pointer;
}

.module-item:hover {
    background: var(--glass-bg);
}

.module-item.completed {
    color: var(--success);
}

.module-item.active {
    background: rgba(255, 107, 53, 0.1);
    border-left: 3px solid var(--primary);
    color: var(--primary);
}

.module-item.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.module-item i {
    font-size: 1rem;
}

.module-item span:first-of-type {
    flex: 1;
    font-size: 0.85rem;
}

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

/* Content Area */
.content-area {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.video-player-wrapper {
    background: #000;
}

.video-player {
    width: 100%;
    aspect-ratio: 16 / 9;
}

.video-player iframe {
    width: 100%;
    height: 100%;
}

.video-controls {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.8);
}

.btn-control {
    padding: 0.75rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.btn-control:hover {
    background: var(--glass-border);
}

.btn-control.primary {
    background: linear-gradient(135deg, var(--success), var(--teal));
    border-color: var(--success);
}

/* Content Tabs */
.content-tabs {
    display: flex;
    border-bottom: 1px solid var(--glass-border);
}

.tab-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    color: var(--text-primary);
    background: var(--glass-bg);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background: var(--glass-bg);
}

/* Tab Content */
.tab-content {
    display: none;
    padding: var(--spacing-lg);
}

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

.tab-content h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.tab-content h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    margin: var(--spacing-lg) 0 var(--spacing-sm);
    color: var(--primary);
}

.content-intro {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.content-list {
    list-style: none;
    padding-left: 0;
    margin: var(--spacing-md) 0;
}

.content-list li {
    padding: var(--spacing-sm) 0;
    padding-left: 1.5rem;
    position: relative;
    line-height: 1.8;
}

.content-list li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: bold;
}

.content-list li strong {
    color: var(--primary);
}

.info-box,
.summary-box {
    display: flex;
    gap: var(--spacing-md);
    background: var(--glass-bg);
    border-left: 4px solid var(--secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.info-box i {
    font-size: 1.5rem;
    color: var(--secondary);
}

.info-box h4,
.summary-box h4 {
    margin-bottom: var(--spacing-xs);
}

.summary-box {
    border-left-color: var(--success);
}

.summary-box i {
    color: var(--success);
}

/* Notes Section */
.notes-editor {
    margin-bottom: var(--spacing-lg);
}

.note-textarea {
    width: 100%;
    min-height: 200px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    margin: var(--spacing-md) 0;
}

.saved-notes h4 {
    margin-bottom: var(--spacing-md);
}

.note-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

/* Discussion Section */
.comment-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.comment-item img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.comment-content h4 {
    margin-bottom: var(--spacing-xs);
}

.comment-content h4 span {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-left: var(--spacing-xs);
}

/* Resources Section */
.resource-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
}

.resource-item i {
    font-size: 1.5rem;
    color: var(--primary);
}

.resource-item span {
    flex: 1;
}

.btn-download {
    padding: 0.5rem 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   QUIZ SCREENS
   ======================================== */

/* Quiz Start */
.quiz-start-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80vh;
    padding: var(--spacing-lg);
}

.quiz-start-card {
    max-width: 600px;
    width: 100%;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    text-align: center;
}

.quiz-icon-large {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary), var(--purple));
    border-radius: 50%;
    font-size: 3rem;
}

.quiz-start-card h1 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.quiz-subtitle {
    color: var(--primary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
}

.quiz-info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.quiz-info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.quiz-info-item i {
    font-size: 2rem;
    color: var(--primary);
}

.quiz-info-item h3 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

.quiz-info-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.quiz-instructions {
    text-align: left;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.quiz-instructions h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.quiz-instructions ul {
    list-style: none;
    padding: 0;
}

.quiz-instructions li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.quiz-instructions li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

.btn-start-quiz {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-md);
}

.btn-start-quiz:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-back-simple {
    width: 100%;
    padding: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    margin-top: var(--spacing-sm);
    transition: var(--transition);
}

.btn-back-simple:hover {
    background: var(--glass-border);
    color: var(--text-primary);
}

/* Quiz Active */
.quiz-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.quiz-timer {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--warning);
}

.quiz-progress-info {
    color: var(--text-secondary);
}

.btn-quit-quiz {
    padding: 0.75rem 1.5rem;
    background: var(--danger);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.btn-quit-quiz:hover {
    background: #C0392B;
}

.quiz-progress-bar {
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success), var(--teal));
    border-radius: 10px;
    transition: width 0.5s ease;
}

.quiz-content {
    display: grid;
    grid-template-columns: 1fr 250px;
    gap: var(--spacing-lg);
}

.question-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.question-number {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.question-text {
    font-size: 1.5rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.question-hint {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

.question-hint i {
    color: var(--warning);
}

.answer-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.answer-option {
    display: block;
    cursor: pointer;
}

.answer-option input {
    display: none;
}

.option-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.answer-option input:checked + .option-content {
    background: rgba(255, 107, 53, 0.2);
    border-color: var(--primary);
}

.option-content:hover {
    background: var(--glass-border);
    border-color: var(--primary);
}

.option-letter {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.option-text {
    flex: 1;
    font-size: 1rem;
    line-height: 1.6;
}

.question-actions {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

#markReviewBtn {
    background: var(--glass-bg);
    border: 1px solid var(--warning);
    color: var(--warning);
}

/* Question Navigator */
.question-navigator {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    height: fit-content;
    position: sticky;
    top: 20px;
}

.question-navigator h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.navigator-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
    margin-bottom: var(--spacing-md);
}

.nav-dot {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.nav-dot:hover {
    background: var(--glass-border);
}

.nav-dot.current {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.nav-dot.answered {
    background: rgba(46, 204, 113, 0.2);
    border-color: var(--success);
    color: var(--success);
}

.nav-dot.marked {
    background: rgba(243, 156, 18, 0.2);
    border-color: var(--warning);
    color: var(--warning);
}

.navigator-legend {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--glass-border);
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: var(--spacing-md);
    font-size: 0.85rem;
}

.navigator-legend div {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.legend-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
}

.legend-dot.current {
    background: var(--primary);
    border-color: var(--primary);
}

.legend-dot.answered {
    background: rgba(46, 204, 113, 0.2);
    border-color: var(--success);
}

.legend-dot.marked {
    background: rgba(243, 156, 18, 0.2);
    border-color: var(--warning);
}

.btn-submit-quiz {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--success), var(--teal));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}

.btn-submit-quiz:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Quiz Result */
.result-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.result-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.result-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--warning), var(--primary));
    border-radius: 50%;
    font-size: 3rem;
}

.result-header h1 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.result-score-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.score-circle {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-lg);
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-text h2 {
    font-size: 2.5rem;
    margin-bottom: 0.25rem;
}

.score-text p {
    font-size: 1.25rem;
    color: var(--success);
}

.score-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: var(--spacing-md);
}

.score-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.score-item i {
    font-size: 1.5rem;
}

.score-item i.green {
    color: var(--success);
}

.score-item i.red {
    color: var(--danger);
}

.score-item i.orange {
    color: var(--warning);
}

.score-item i.gold {
    color: #FFD700;
}

.score-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

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

/* Result Analysis */
.result-analysis {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.result-analysis h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: var(--spacing-md);
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.analysis-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.analysis-card.weak {
    border-color: var(--danger);
}

.analysis-card h4 {
    margin-bottom: var(--spacing-md);
}

.topic-list {
    list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-md);
}

.topic-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
}

.topic-score {
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
}

.topic-score.green {
    background: rgba(46, 204, 113, 0.2);
    color: var(--success);
}

.topic-score.red {
    background: rgba(231, 76, 60, 0.2);
    color: var(--danger);
}

.topic-score.orange {
    background: rgba(243, 156, 18, 0.2);
    color: var(--warning);
}

.btn-practice {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-practice:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.result-comparison {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.result-comparison h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: var(--spacing-md);
}

.comparison-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.comparison-stats .stat {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.comparison-stats .stat i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: var(--spacing-sm);
}

.comparison-stats .stat h3 {
    font-size: 1.75rem;
    margin: var(--spacing-xs) 0;
}

.comparison-stats .stat p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ========================================
   PROFILE PAGE
   ======================================== */

.profile-container {
    max-width: 1000px;
    margin: 0 auto;
}

.profile-header-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    margin-bottom: var(--spacing-lg);
}

.profile-cover {
    height: 150px;
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--purple));
}

.profile-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    margin-top: -60px;
}

.profile-avatar-large {
    position: relative;
    width: 120px;
    height: 120px;
    flex-shrink: 0;
}

.profile-avatar-large img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    border: 4px solid var(--bg-dark);
}

.edit-avatar-btn {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    border: 2px solid var(--bg-dark);
    border-radius: 50%;
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.edit-avatar-btn:hover {
    background: var(--primary-dark);
}

.profile-details h1 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.profile-details p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.profile-badges-row {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.badge-tag {
    padding: 0.5rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 0.85rem;
}

.badge-tag.green {
    border-color: var(--success);
    color: var(--success);
}

.badge-tag.purple {
    border-color: var(--purple);
    color: var(--purple);
}

.profile-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.stat-box {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
}

.stat-box:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-box i {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.stat-box i.blue {
    color: var(--secondary);
}

.stat-box i.green {
    color: var(--success);
}

.stat-box i.gold {
    color: #FFD700;
}

.stat-box i.orange {
    color: var(--warning);
}

.stat-box i.purple {
    color: var(--purple);
}

.stat-box i.teal {
    color: var(--teal);
}

.stat-box h3 {
    font-size: 1.75rem;
    margin-bottom: 0.25rem;
}

.stat-box p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.profile-sections {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.profile-section {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
}

.profile-section h2 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.profile-section h2 i {
    color: var(--primary);
}

/* Badges Showcase */
.badges-showcase {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.badge-showcase-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: var(--transition);
}

.badge-showcase-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
}

.badge-showcase-item.earned {
    border-color: var(--success);
    background: rgba(46, 204, 113, 0.1);
}

.badge-showcase-item.locked {
    opacity: 0.4;
}

.badge-icon-large {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.badge-showcase-item p {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.earned-date,
.lock-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Analytics Cards */
.analytics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.analytics-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.analytics-card h4 {
    margin-bottom: var(--spacing-md);
}

.streak-calendar {
    display: flex;
    justify-content: space-around;
    margin-bottom: var(--spacing-sm);
}

.streak-day {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    font-weight: 600;
}

.streak-day.done {
    background: var(--success);
    border-color: var(--success);
}

.streak-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.weekly-chart {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 100px;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
}

.chart-bar-simple {
    flex: 1;
    background: linear-gradient(180deg, var(--primary), var(--primary-dark));
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    transition: var(--transition);
}

.chart-bar-simple:hover {
    background: linear-gradient(180deg, var(--primary-light), var(--primary));
}

.chart-bar-simple.active {
    background: linear-gradient(180deg, var(--success), var(--teal));
}

.chart-text-simple {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Settings Form */
.settings-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 600;
    color: var(--text-secondary);
}

.form-input {
    padding: 0.75rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--glass-border);
}

/* Notification Settings */
.notification-settings {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
}

.setting-info h4 {
    margin-bottom: 0.25rem;
}

.setting-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Toggle Switch */
.toggle-switch {
    position: relative;
    width: 60px;
    height: 32px;
    display: inline-block;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    border-radius: 32px;
    transition: var(--transition);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 24px;
    width: 24px;
    left: 4px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
}

input:checked + .toggle-slider {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
}

input:checked + .toggle-slider:before {
    transform: translateX(28px);
}

/* ========================================
   BOTTOM NAVIGATION (MOBILE)
   ======================================== */

.bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--bg-sidebar);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-sm);
    z-index: 1000;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.75rem;
    transition: var(--transition);
}

.bottom-nav-item i {
    font-size: 1.25rem;
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
    color: var(--primary);
}

/* ========================================
   FLOATING ACTION BUTTONS
   ======================================== */

.floating-actions {
    position: fixed;
    bottom: 100px;
    right: 30px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    z-index: 999;
}

.fab-button {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fab-button:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 8px 24px rgba(255, 107, 53, 0.6);
}

.fab-button:nth-child(2) {
    background: linear-gradient(135deg, var(--secondary), var(--purple));
    box-shadow: 0 4px 16px rgba(74, 144, 226, 0.4);
}

.fab-button:nth-child(2):hover {
    box-shadow: 0 8px 24px rgba(74, 144, 226, 0.6);
}

/* ========================================
   MODAL SYSTEM
   ======================================== */

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp 0.3s ease;
}

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

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

.modal-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.25rem;
    margin: 0;
}

.modal-header h3 i {
    color: var(--primary);
}

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    background: var(--danger);
    border-color: var(--danger);
    transform: rotate(90deg);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

/* ========================================
   NOTES MODAL
   ======================================== */

.notes-modal .modal-content {
    max-width: 700px;
}

.notes-toolbar {
    display: flex;
    gap: 0.5rem;
    padding: var(--spacing-sm);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.notes-dropdown {
    padding: 0.5rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.9rem;
}

.toolbar-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.toolbar-btn:hover {
    background: var(--glass-border);
    color: var(--text-primary);
    border-color: var(--primary);
}

.notes-editor-area {
    min-height: 400px;
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    line-height: 1.8;
    outline: none;
    margin-bottom: var(--spacing-md);
}

.notes-editor-area:empty:before {
    content: attr(placeholder);
    color: var(--text-muted);
}

.notes-editor-area:focus {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.notes-footer {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-sm);
}

/* ========================================
   ASSISTANT MODAL
   ======================================== */

.assistant-modal .modal-content {
    max-width: 500px;
    max-height: 600px;
}

.assistant-welcome {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.assistant-avatar {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary), var(--purple));
    border-radius: 50%;
    font-size: 2.5rem;
    color: white;
}

.assistant-greeting {
    line-height: 1.8;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.assistant-greeting strong {
    color: var(--primary);
}

.chat-messages {
    min-height: 250px;
    max-height: 350px;
    overflow-y: auto;
    padding: var(--spacing-md) 0;
    margin-bottom: var(--spacing-md);
}

.chat-message {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    animation: messageSlideIn 0.3s ease;
}

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

.chat-message.user {
    flex-direction: row-reverse;
}

.chat-avatar {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.25rem;
}

.chat-message.assistant .chat-avatar {
    background: linear-gradient(135deg, var(--secondary), var(--purple));
    color: white;
}

.chat-message.user .chat-avatar {
    background: var(--primary);
    color: white;
}

.chat-bubble {
    max-width: 70%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    line-height: 1.6;
}

.chat-message.assistant .chat-bubble {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.chat-message.user .chat-bubble {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.chat-input-area {
    display: flex;
    gap: var(--spacing-sm);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--glass-border);
}

.chat-input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.chat-input:focus {
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.chat-input::placeholder {
    color: var(--text-muted);
}

.btn-send {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.btn-send:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
}

.btn-send:active {
    transform: translateY(0);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 0.5rem;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    width: fit-content;
}

.typing-dot {
    width: 8px;
    height: 8px;
    background: var(--text-muted);
    border-radius: 50%;
    animation: typingBounce 1.4s infinite;
}

.typing-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-10px);
    }
}

/* ========================================
   AI COURSE GENERATOR SCREEN
   ======================================== */

.generator-container {
    max-width: 900px;
    margin: 0 auto;
}

.generator-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.generator-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--glass-border);
}

.step-indicator {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    opacity: 0.5;
    transition: var(--transition);
}

.step.active {
    opacity: 1;
}

.step-number {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 700;
    transition: var(--transition);
}

.step.active .step-number {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-color: var(--primary);
    color: white;
}

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

.step-line {
    flex: 1;
    height: 2px;
    background: var(--glass-border);
    margin: 0 1rem;
}

.generator-body {
    padding: var(--spacing-xl);
}

.generator-step {
    display: none;
}

.generator-step.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

.generator-step h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.form-input.large {
    font-size: 1.125rem;
    padding: 1rem 1.25rem;
}

.btn-next-step,
.btn-back-step,
.btn-generate {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
}

.btn-next-step,
.btn-generate {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
}

.btn-next-step:hover,
.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-back-step {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.step-actions {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xl);
}

/* Content Type Cards */
.content-type-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.content-type-card {
    position: relative;
    cursor: pointer;
}

.content-type-card input {
    display: none;
}

.card-content {
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: var(--transition);
}

.content-type-card:hover .card-content {
    border-color: var(--primary);
    transform: translateY(-5px);
}

.content-type-card input:checked ~ .card-content {
    background: rgba(255, 107, 53, 0.1);
    border-color: var(--primary);
}

.type-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--primary);
}

.card-content h3 {
    margin-bottom: var(--spacing-xs);
}

.card-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.selected-indicator {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 32px;
    height: 32px;
    background: var(--success);
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    color: white;
}

.content-type-card input:checked ~ .selected-indicator {
    display: flex;
}

/* Language Grid */
.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.language-card {
    cursor: pointer;
}

.language-card input {
    display: none;
}

.card-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: var(--spacing-md);
    background: var(--glass-bg);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.language-card:hover .card-inner {
    border-color: var(--primary);
}

.language-card input:checked ~ .card-inner {
    background: rgba(255, 107, 53, 0.1);
    border-color: var(--primary);
}

.lang-flag {
    font-size: 2.5rem;
}

.lang-name {
    font-weight: 600;
    text-align: center;
}

/* Review Card */
.review-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.review-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--glass-border);
}

.review-item:last-child {
    border-bottom: none;
}

.generation-info {
    margin-bottom: var(--spacing-lg);
}

.info-box {
    display: flex;
    gap: var(--spacing-md);
    background: rgba(74, 144, 226, 0.1);
    border: 1px solid var(--secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.info-box i {
    font-size: 1.5rem;
    color: var(--secondary);
}

.info-box h4 {
    margin-bottom: var(--spacing-xs);
}

.info-box ul {
    list-style: none;
    padding: 0;
}

.info-box li {
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.info-box li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success);
}

/* Generating Animation */
.generating-animation {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.ai-loader {
    position: relative;
    width: 120px;
    height: 120px;
    margin: 0 auto var(--spacing-lg);
}

.ai-brain {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--secondary), var(--purple));
    border-radius: 50%;
    font-size: 2rem;
    z-index: 2;
}

.loader-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid transparent;
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1.5s linear infinite;
}

.loader-ring.ring-2 {
    border-top-color: var(--secondary);
    animation-duration: 2s;
    animation-direction: reverse;
}

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

.generating-status {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.progress-bar-full {
    max-width: 400px;
    margin: 0 auto var(--spacing-sm);
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill-full {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--success));
    border-radius: 10px;
    transition: width 0.5s ease;
}

.progress-percent {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

/* ========================================
   MARKETPLACE SCREEN
   ======================================== */

.market-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.market-stat-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
}

.market-stat-card i {
    font-size: 2rem;
    color: var(--primary);
}

.market-stat-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.25rem;
}

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

.section-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-lg);
}

.marketplace-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.market-course-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.market-course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.market-course-image {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.market-course-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.price-badge {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: var(--success);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 700;
}

.bestseller-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--warning);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}

.market-course-content {
    padding: var(--spacing-md);
}

.market-course-content h3 {
    margin-bottom: var(--spacing-sm);
}

.course-author {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.course-author img {
    width: 24px;
    height: 24px;
    border-radius: 50%;
}

.btn-buy-course {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: var(--spacing-sm);
}

.btn-buy-course:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   CERTIFICATES SCREEN
   ======================================== */

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.certificate-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.certificate-image {
    width: 100px;
    height: 100px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--warning), var(--primary));
    border-radius: 50%;
    font-size: 3rem;
}

.certificate-card h3 {
    margin-bottom: var(--spacing-xs);
}

.certificate-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.cert-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.cert-actions button {
    flex: 1;
}

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

@media (max-width: 1200px) {
    .course-detail-layout {
        grid-template-columns: 1fr;
    }
    
    .modules-sidebar {
        max-height: none;
        position: static;
    }
    
    .quiz-content {
        grid-template-columns: 1fr;
    }
    
    .question-navigator {
        position: static;
    }
}

@media (max-width: 768px) {
    /* Sidebar becomes overlay */
    .sidebar {
        left: -280px;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .close-sidebar {
        display: block;
    }
    
    /* Main content takes full width */
    .main-content {
        margin-left: 0;
        padding: var(--spacing-md);
        padding-bottom: 80px;
    }
    
    /* Show mobile menu toggle */
    .menu-toggle {
        display: block;
    }
    
    /* Show bottom navigation */
    .bottom-nav {
        display: grid;
        grid-template-columns: repeat(5, 1fr);
    }
    
    /* Floating action buttons */
    .floating-actions {
        bottom: 80px;
        right: 20px;
    }
    
    .fab-button {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }
    
    /* Modals on mobile */
    .modal-content {
        max-width: 100%;
        max-height: 95vh;
        border-radius: var(--radius-lg);
    }
    
    .assistant-modal .modal-content,
    .notes-modal .modal-content {
        max-width: 100%;
    }
    
    .chat-bubble {
        max-width: 80%;
    }
    
    .notes-editor-area {
        min-height: 300px;
    }
    
    /* Stack cards on mobile */
    .stats-grid,
    .course-grid,
    .two-col-layout,
    .analysis-grid,
    .comparison-stats,
    .profile-stats-grid,
    .badges-showcase,
    .analytics-grid {
        grid-template-columns: 1fr;
    }
    
    .quiz-info-grid {
        grid-template-columns: 1fr;
    }
    
    /* Mobile typography adjustments */
    .welcome-banner h1 {
        font-size: 1.5rem;
    }
    
    .page-header h1 {
        font-size: 1.5rem;
    }
    
    .section-header h2 {
        font-size: 1.25rem;
    }
    
    /* Mobile daily challenge */
    .daily-challenge-card {
        flex-direction: column;
        text-align: center;
    }
    
    /* Mobile course cards */
    .course-card-detailed {
        flex-direction: column;
    }
    
    .course-thumbnail-large {
        width: 100%;
        height: 200px;
    }
    
    /* Mobile profile */
    .profile-info {
        flex-direction: column;
        text-align: center;
    }
    
    /* Mobile header search */
    .header-search {
        order: 3;
        width: 100%;
    }
    
    /* Mobile quiz */
    .quiz-header-bar {
        flex-wrap: wrap;
        gap: var(--spacing-sm);
    }
    
    .quiz-progress-info {
        order: 3;
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    /* Further mobile optimizations */
    body {
        font-size: 14px;
    }
    
    .welcome-banner {
        padding: var(--spacing-md);
    }
    
    .welcome-illustration {
        display: none;
    }
    
    .course-actions,
    .course-detail-actions,
    .result-actions {
        flex-direction: column;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 100%;
        justify-content: center;
    }
    
    .navigator-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}