/* Professional E-Learning System Styling */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    /* Professional SAHAL Color Palette */
    --primary-color: #005b96;
    --primary-dark: #003d66;
    --primary-light: #4a90e2;
    --secondary-color: #28a745;
    --secondary-dark: #1e7e34;
    --accent-color: #ff6b6b;
    --accent-dark: #feca57;
    --success-color: #28a745;
    --success-dark: #1e7e34;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    --error-dark: #c82333;

    /* Neutral Colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-gradient: linear-gradient(135deg, #005b96 0%, #003d66 100%);
    --bg-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);

    /* Border and Surface */
    --border-color: #e5e7eb;
    --border-light: #f3f4f6;
    --surface-elevated: #ffffff;

    /* Shadows with better depth */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px rgb(99 102 241 / 0.3);

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Typography */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    color: var(--text-primary);
    background:
        radial-gradient(circle at 20% 50%, rgba(120, 119, 198, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(120, 119, 198, 0.05) 0%, transparent 50%),
        linear-gradient(135deg, var(--bg-secondary) 0%, #e2e8f0 50%, #f1f5f9 100%);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="rgba(99,102,241,0.03)"/><circle cx="75" cy="75" r="1" fill="rgba(99,102,241,0.03)"/><circle cx="50" cy="10" r="0.5" fill="rgba(99,102,241,0.02)"/><circle cx="90" cy="40" r="0.5" fill="rgba(99,102,241,0.02)"/><circle cx="10" cy="90" r="0.5" fill="rgba(99,102,241,0.02)"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    pointer-events: none;
    z-index: -1;
}

header {
    background:
        linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--secondary-color) 100%),
        linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    background-blend-mode: normal, overlay;
    color: white;
    padding: 1.5rem 2rem;
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(99, 102, 241, 0.3);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0% { left: -100%; }
    100% { left: 100%; }
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    height: 60px;
    width: auto;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.brand h1 {
    margin: 0;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.tagline {
    margin: 0.2rem 0 0 0;
    font-size: 0.9rem;
    opacity: 0.9;
    font-weight: 300;
    letter-spacing: 0.5px;
}

nav {
    margin-top: 1rem;
}

nav {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

nav a:hover::before {
    left: 100%;
}

nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255,255,255,0.4);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Enhanced Dashboard specific styles */
.welcome-section {
    text-align: center;
    background:
        linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--secondary-color) 100%),
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255,255,255,0.1) 0%, transparent 50%);
    background-blend-mode: normal, overlay, overlay;
    color: white;
    padding: 4rem 2rem;
    border-radius: var(--radius-xl);
    margin-bottom: 2rem;
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.welcome-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 20s linear infinite;
    opacity: 0.3;
}

.welcome-section .floating-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.welcome-section .particle {
    background: rgba(255, 255, 255, 0.6);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.welcome-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.9;
}

.welcome-section h2 {
    margin: 0 0 0.5rem 0;
    font-size: 2.5rem;
    font-weight: 300;
}

.welcome-section p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.welcome-stats {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.welcome-stat {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.welcome-stat:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.welcome-stat i {
    font-size: 1.5rem;
    color: #ffd700;
    filter: drop-shadow(0 0 10px rgba(255, 215, 0, 0.5));
}

.welcome-stat span {
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

/* Mobile responsiveness for welcome stats */
@media (max-width: 768px) {
    .welcome-stats {
        gap: 1rem;
    }

    .welcome-stat {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .welcome-stat i {
        font-size: 1.2rem;
    }

    .welcome-stat span {
        font-size: 0.85rem;
    }
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.stat-card {
    background:
        var(--bg-card),
        linear-gradient(145deg, rgba(255,255,255,0.9) 0%, rgba(248,250,252,0.9) 100%);
    background-blend-mode: normal, overlay;
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(99, 102, 241, 0.1);
    display: flex;
    align-items: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.stat-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(99,102,241,0.05) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.stat-card:hover {
    transform: translateY(-12px) scale(1.03);
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(99, 102, 241, 0.2);
}

.stat-card:hover::after {
    opacity: 1;
}

.stat-icon {
    font-size: 3rem;
    color: #667eea;
    margin-right: 1.5rem;
}

.stat-info h3 {
    margin: 0;
    font-size: 2.5rem;
    color: #333;
    font-weight: 300;
}

.stat-info p {
    margin: 0.5rem 0 0 0;
    color: #666;
    font-weight: 500;
}

.enrolled-courses h3 {
    color: #333;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
}

.enrolled-courses h3 i {
    margin-right: 0.5rem;
    color: #667eea;
}

.course-card {
    background:
        var(--bg-card),
        linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.95) 100%);
    background-blend-mode: normal, overlay;
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow:
        var(--shadow-lg),
        0 0 30px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.course-card::after {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.course-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow:
        var(--shadow-xl),
        0 0 50px rgba(99, 102, 241, 0.15);
}

.course-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
}

.course-card:hover::after {
    opacity: 1;
}

.course-header {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}

.course-icon {
    font-size: 2rem;
    color: #667eea;
    margin-right: 1rem;
}

.course-card h4 {
    margin: 0;
    color: #333;
    font-size: 1.5rem;
}

.course-card p {
    margin: 0.5rem 0;
    color: #666;
}

.course-card p i {
    margin-right: 0.5rem;
    color: #667eea;
}

.progress-bar {
    background-color: #e0e0e0;
    border-radius: 10px;
    height: 8px;
    margin: 1rem 0;
    overflow: hidden;
}

.progress-fill {
    background: linear-gradient(90deg, #667eea, #764ba2);
    height: 100%;
    border-radius: 10px;
    transition: width 0.3s ease;
}

.progress-text {
    text-align: right;
    font-size: 0.9rem;
    color: #666;
    margin: 0;
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.empty-icon {
    font-size: 4rem;
    color: #ccc;
    margin-bottom: 1rem;
}

.empty-state p {
    color: #666;
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

/* Index page specific styles */
.stats-section {
    margin-bottom: 3rem;
}

.stats-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.stat-item {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-5px);
}

.stat-icon-large {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.stat-item h3 {
    font-size: 2.5rem;
    color: #333;
    margin: 0.5rem 0;
    font-weight: 300;
}

.stat-item p {
    color: #666;
    margin: 0;
    font-weight: 500;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card h4 {
    color: #333;
    margin: 1rem 0 0.5rem 0;
    font-size: 1.3rem;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.cta-content h3 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 300;
}

.cta-content h3 i {
    margin-right: 0.5rem;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-btn {
    background: white !important;
    color: #667eea !important;
    font-size: 1.1rem;
    padding: 1rem 2rem !important;
}

.cta-btn i {
    margin-right: 0.5rem;
}

/* Professional Admin Navigation */
.admin-nav {
    position: relative;
    margin-bottom: 2rem;
    background:
        linear-gradient(135deg, var(--bg-primary) 0%, rgba(248,250,252,0.95) 100%),
        linear-gradient(45deg, rgba(99,102,241,0.05) 0%, rgba(6,182,212,0.05) 100%);
    background-blend-mode: normal, overlay;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-lg);
    box-shadow:
        0 4px 20px rgba(0, 0, 0, 0.08),
        0 0 40px rgba(99, 102, 241, 0.1);
    padding: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.admin-nav-container {
  display: flex;
  justify-content: center;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.25rem 2rem;
  gap: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-lg);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    border: 1px solid transparent;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99,102,241,0.1), transparent);
    transition: left 0.5s ease;
}

.nav-link:hover::before {
    left: 100%;
}

.nav-link:hover {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    border-color: rgba(99, 102, 241, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.nav-link.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow:
        0 4px 16px rgba(99, 102, 241, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
}

.nav-link.active::before {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
}

.nav-link i {
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.nav-link:hover i {
    transform: scale(1.1);
}

.nav-link.active i {
    color: white;
}

/* Responsive Admin Navigation */
@media (max-width: 1024px) {
    .admin-nav-container {
        padding: 0.5rem 1rem;
        gap: 0.125rem;
    }

    .nav-link {
        padding: 0.625rem 1rem;
        font-size: 0.85rem;
    }

    .nav-link span {
        display: none; /* Hide text on smaller screens */
    }

    .nav-link i {
        font-size: 1.1rem;
    }
}

@media (max-width: 768px) {
    .admin-nav-container {
        flex-wrap: wrap;
        justify-content: space-around;
        padding: 0.5rem;
    }

    .nav-link {
        flex: 1;
        min-width: 60px;
        padding: 0.5rem 0.25rem;
        justify-content: center;
    }

    .nav-link span {
        display: none;
    }
}

/* Enhanced Admin page styles */
.admin-section {
    background:
        var(--bg-card),
        linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.95) 100%);
    background-blend-mode: normal, overlay;
    padding: 2.5rem;
    border-radius: var(--radius-xl);
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(0, 0, 0, 0.08);
    margin-bottom: 2.5rem;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.admin-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.admin-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.admin-section h3 i {
    margin-right: 0.75rem;
    color: var(--primary-color);
    font-size: 1.5rem;
}

.section-description {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    margin-bottom: var(--space-xl);
    line-height: 1.6;
    font-weight: 400;
}

.admin-section h3 {
    color: #333;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
}

.admin-section h3 i {
    margin-right: 0.5rem;
    color: #667eea;
}

.admin-section form {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 1rem;
    align-items: center;
}

.admin-section label {
    font-weight: 500;
}

.admin-section input[type="text"],
.admin-section input[type="url"],
.admin-section input[type="number"],
.admin-section select,
.admin-section textarea {
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

.admin-section textarea {
    resize: vertical;
    min-height: 80px;
}

.admin-section button {
    grid-column: 2;
    padding: 0.75rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.admin-section button:hover {
    transform: translateY(-2px);
}

.progress-table {
    overflow-x: auto;
}

.progress-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.progress-table th,
.progress-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
}

.progress-table th {
    background: #f8f9fa;
    font-weight: 600;
    color: #333;
}

.progress-table tr:hover {
    background: #f8f9fa;
}

.completed {
    color: #28a745;
    font-weight: 500;
}

.pending {
    color: #ffc107;
    font-weight: 500;
}

/* Login page styles */
.auth-container {
    max-width: 500px;
    margin: 2rem auto;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--border-color);
}

.tab-btn {
    flex: 1;
    padding: 1rem;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

.tab-btn:hover:not(.active) {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.auth-form {
    display: none;
    padding: 2rem;
}

.auth-form.active {
    display: block;
}

.auth-form h2 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.auth-form p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.auth-form p {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 2rem;
    border-radius: 20px;
    margin-bottom: 3rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="80" cy="80" r="2" fill="rgba(255,255,255,0.1)"/><circle cx="60" cy="30" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.5;
}

.hero-content {
    flex: 1;
    z-index: 1;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 300;
}

.hero h2 i {
    margin-right: 0.5rem;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.primary-btn {
    background: white !important;
    color: #667eea !important;
}

.secondary-btn {
    background: rgba(255,255,255,0.2) !important;
    color: white !important;
    border: 2px solid rgba(255,255,255,0.3) !important;
}

.secondary-btn:hover {
    background: rgba(255,255,255,0.3) !important;
}

.hero-graphics {
    flex: 1;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-icon {
    font-size: 8rem;
    opacity: 0.8;
    animation: float 3s ease-in-out infinite;
}

.floating-elements {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.floating-icon {
    position: absolute;
    font-size: 2rem;
    opacity: 0.6;
    animation: float 4s ease-in-out infinite;
}

.floating-icon:nth-child(1) {
    top: 20%;
    left: 20%;
    animation-delay: 0s;
}

.floating-icon:nth-child(2) {
    top: 60%;
    right: 15%;
    animation-delay: 1s;
}

.floating-icon:nth-child(3) {
    bottom: 20%;
    left: 30%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

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

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

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

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

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

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

/* Enhanced visual elements */
.glass-effect {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.gradient-bg {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    background-size: 300% 300%;
    animation: gradientShift 8s ease infinite;
}

.animate-fade-in {
    animation: fadeIn 0.8s ease-out;
}

.animate-slide-up {
    animation: slideInUp 0.8s ease-out;
}

.animate-pulse {
    animation: pulse 3s infinite;
}

.animate-bounce {
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Decorative Elements */
.decorative-circle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    opacity: 0.1;
    pointer-events: none;
}

.decorative-circle.large {
    width: 200px;
    height: 200px;
    top: -100px;
    right: -100px;
}

.decorative-circle.medium {
    width: 100px;
    height: 100px;
    bottom: -50px;
    left: -50px;
}

.decorative-circle.small {
    width: 50px;
    height: 50px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

/* Floating particles effect */
.floating-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--primary-color);
    border-radius: 50%;
    opacity: 0.6;
    animation: float-particle 10s linear infinite;
}

.particle:nth-child(1) { left: 10%; animation-delay: 0s; }
.particle:nth-child(2) { left: 20%; animation-delay: 1s; }
.particle:nth-child(3) { left: 30%; animation-delay: 2s; }
.particle:nth-child(4) { left: 40%; animation-delay: 3s; }
.particle:nth-child(5) { left: 50%; animation-delay: 4s; }
.particle:nth-child(6) { left: 60%; animation-delay: 5s; }
.particle:nth-child(7) { left: 70%; animation-delay: 6s; }
.particle:nth-child(8) { left: 80%; animation-delay: 7s; }
.particle:nth-child(9) { left: 90%; animation-delay: 8s; }

@keyframes float-particle {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.6; }
    90% { opacity: 0.6; }
    100% { transform: translateY(-100px) rotate(360deg); opacity: 0; }
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 0.875rem 1.75rem;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn:active {
    transform: translateY(0) scale(0.98);
}

.btn-small {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    margin: 0.25rem;
}

.btn-small::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn-small:hover::before {
    left: 100%;
}

.btn-small:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-small:active {
    transform: translateY(0) scale(0.98);
}

.features {
    margin-bottom: 2rem;
}

.features h3 {
    color: #667eea;
    text-align: center;
}

.features ul {
    list-style-type: none;
    padding: 0;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

.features li {
    background: white;
    padding: 1.5rem;
    margin: 0.5rem;
    border-radius: 10px;
    flex: 1 1 200px;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.features li:hover {
    transform: translateY(-5px);
}

footer {
    background:
        linear-gradient(135deg, #1f2937 0%, #374151 50%, #4b5563 100%),
        linear-gradient(45deg, rgba(99,102,241,0.1) 0%, rgba(6,182,212,0.1) 100%);
    background-blend-mode: normal, overlay;
    color: white;
    text-align: center;
    padding: 2rem 1rem;
    margin-top: 4rem;
    border-top: 3px solid var(--primary-color);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
}

footer p {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.8;
    position: relative;
    z-index: 1;
}

/* Form styling */
form {
    max-width: 400px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: #f9f9f9;
    border-radius: 8px;
}

form h2 {
    text-align: center;
    color: #667eea;
}

form label {
    display: block;
    margin-bottom: 0.5rem;
}

form input[type="text"],
form input[type="email"],
form input[type="password"] {
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 4px;
}

form button {
    width: 100%;
    padding: 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.error {
    color: red;
    text-align: center;
    margin-bottom: 1rem;
}

.success {
    color: green;
    text-align: center;
    margin-bottom: 1rem;
}

/* Course listing styles */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.course-card {
    background: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #005b96, #28a745, #ff6b6b);
    border-radius: 16px 16px 0 0;
}

.course-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 91, 150, 0.15);
}

.course-card h3 {
    color: #005b96;
    margin-top: 0;
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.course-card p {
    margin: 0.75rem 0;
    color: #6b7280;
    font-size: 0.95rem;
    line-height: 1.5;
}

.course-card p strong {
    color: #005b96;
    font-weight: 600;
}
/* Quizzes section */
.quizzes-section h3 {
    color: #333;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
}

.quizzes-section h3 i {
    margin-right: 0.5rem;
    color: #667eea;
}
/* Quizzes styles */
.quizzes-list {
    display: grid;
    gap: 1rem;
}

.quiz-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.quiz-header h4 {
    margin: 0;
    color: #333;
}

.scheduled-date {
    color: #667eea;
    font-size: 0.9rem;
    font-weight: 500;
}

.quiz-actions {
    margin-top: 1rem;
    text-align: right;
}

.question-item {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 1rem;
    border: 1px solid #dee2e6;
}

.question-item .form-group {
    margin-bottom: 0.5rem;
}

/* Quiz taking styles */
.quiz-timer {
    background: #dc3545;
    color: white;
    padding: 1rem;
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    border-radius: 10px;
    margin-bottom: 2rem;
}

.quiz-question {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.quiz-question h4 {
    color: #333;
    margin-bottom: 1rem;
}

.quiz-options {
    display: grid;
    gap: 0.5rem;
}

.quiz-option {
    background: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 5px;
    padding: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quiz-option:hover {
    background: #e9ecef;
}

.quiz-option.selected {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.quiz-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 2rem;
}
/* Submissions styles */
.submissions-list {
    display: grid;
    gap: 1rem;
}

.submission-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.submission-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.submission-header h4 {
    margin: 0;
    color: #333;
}

.submitted-date {
    color: #667eea;
    font-size: 0.9rem;
    font-weight: 500;
}

.grade-display {
    color: #28a745;
    font-weight: 500;
    margin: 0.5rem 0;
}

.grade-form {
    margin-top: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #dee2e6;
}

.grade-form .form-group {
    margin-bottom: 1rem;
}

.grade-form .btn {
    width: auto;
    margin: 0;
}
/* Assignments section */
.assignments-section h3 {
    color: #333;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
}

.assignments-section h3 i {
    margin-right: 0.5rem;
    color: #667eea;
}

.course-name {
    color: #667eea;
    font-size: 0.9rem;
    font-weight: 500;
}

.submission-status {
    font-weight: 500;
    padding: 0.5rem;
    border-radius: 5px;
    margin: 0.5rem 0;
}

.submission-status.submitted {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.submission-form {
    margin-top: 1rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
    border: 1px solid #dee2e6;
}

.submission-form .form-group {
    margin-bottom: 1rem;
}

.submission-form .btn {
    width: auto;
    margin: 0;
}
/* Assignments styles */
.assignments-list {
    display: grid;
    gap: 1rem;
}

.assignment-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.assignment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.assignment-header h4 {
    margin: 0;
    color: #333;
}

.due-date {
    color: #667eea;
    font-weight: 500;
}

.assignment-actions {
    margin-top: 1rem;
    text-align: right;
}
/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
}

/* Enhanced Form group styles */
.form-group {
    margin-bottom: 1.5rem;
    position: relative;
}

.form-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    letter-spacing: 0.025em;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="file"],
.form-group input[type="url"],
.form-group input[type="number"],
.form-group input[type="datetime-local"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    box-sizing: border-box;
    transition: all var(--transition-normal);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
    transform: translateY(-1px);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
    line-height: 1.6;
}

.form-group select {
    cursor: pointer;
    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="6,9 12,15 18,9"></polyline></svg>');
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1rem;
    padding-right: 3rem;
}

/* Form validation states */
.form-group input:invalid:not(:placeholder-shown),
.form-group input:invalid:focus {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-group input:valid:not(:placeholder-shown) {
    border-color: var(--success-color);
}

/* Course actions */
.course-actions {
    display: flex;
    gap: 0.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.course-actions .btn {
    flex: 1;
    min-width: 120px;
    text-align: center;
    margin: 0;
}

/* Instructor courses section */
.instructor-courses h3 {
    color: #333;
    margin-bottom: 2rem;
    font-size: 1.8rem;
    display: flex;
    align-items: center;
}

.instructor-courses h3 i {
    margin-right: 0.5rem;
    color: #667eea;
}
/* Course Management Styles */
.courses-management-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.course-management-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.course-management-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.course-info h4 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.course-info p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.course-info p strong {
    color: var(--text-primary);
    font-weight: 500;
}

.course-actions {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-color) 0%, #dc2626 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    justify-content: center;
}

.btn-danger:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(239, 68, 68, 0.4);
    background: linear-gradient(135deg, #dc2626 0%, var(--error-color) 100%);
}

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

.warning-text {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 1px solid #f59e0b;
    border-radius: var(--radius-md);
    padding: 1rem;
    margin-bottom: 1.5rem;
    color: #92400e;
    font-size: 0.9rem;
    line-height: 1.5;
}

.warning-text i {
    color: #f59e0b;
    margin-right: 0.5rem;
}

/* Student Management Styles */
.students-table-container {
    overflow-x: auto;
}

.students-table-container table {
    min-width: 800px;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.quick-actions .btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.course-navigation {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.course-navigation h2, .course-navigation h3 {
    margin: 0;
    flex: 1;
}

.course-navigation p {
    margin: 0.5rem 0 0 0;
    color: #666;
}

/* Progress Details */
.progress-details {
    margin-top: 1rem;
}

.lessons-list {
    margin-top: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.lesson-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    border-radius: 5px;
    margin-bottom: 0.25rem;
}

.lesson-item.completed {
    background: #d4edda;
    color: #155724;
}

.lesson-item.pending {
    background: #f8f9fa;
    color: #666;
}

.lesson-item i {
    width: 20px;
}

.lesson-item small {
    margin-left: auto;
    font-size: 0.8rem;
    color: #666;
}

/* Materials Styles */
.materials-list {
    display: grid;
    gap: 1rem;
}

.material-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.material-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.material-header h4 {
    margin: 0;
    color: #333;
}

.upload-date {
    color: #667eea;
    font-size: 0.9rem;
    font-weight: 500;
}

/* Quiz Attempts */
.quiz-attempts-list {
    display: grid;
    gap: 1rem;
}

.quiz-attempt-card {
    background: white;
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.score-display {
    color: #28a745;
    font-weight: 500;
    margin: 0.5rem 0;
}

.pending-grade, .in-progress {
    color: #ffc107;
    font-weight: 500;
}

/* Admin Dashboard Professional Styles */
.admin-header {
    text-align: center;
    padding: 3rem 2rem;
    background:
        linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--secondary-color) 100%),
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.2) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255,255,255,0.1) 0%, transparent 50%);
    background-blend-mode: normal, overlay, overlay;
    color: white;
    border-radius: var(--radius-xl);
    margin-bottom: 3rem;
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.admin-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 20s linear infinite;
    opacity: 0.3;
}

.admin-header h1 {
    margin: 0 0 1rem 0;
    font-size: 2.5rem;
    font-weight: 300;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.admin-header p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin: 0;
    max-width: 600px;
    margin: 0 auto;
}

/* Quick Access Dashboard */
.quick-access {
    margin-bottom: 3rem;
}

.quick-access h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 300;
}

.quick-access-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.quick-card {
    background:
        var(--bg-card),
        linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.95) 100%);
    background-blend-mode: normal, overlay;
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    padding: 2.5rem 2rem;
    text-align: center;
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.quick-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.quick-card::after {
    content: '';
    position: absolute;
    top: 20px;
    right: 20px;
    width: 60px;
    height: 60px;
    background: radial-gradient(circle, rgba(99,102,241,0.1) 0%, transparent 70%);
    border-radius: 50%;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.quick-card:hover {
    transform: translateY(-12px) scale(1.03);
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(99, 102, 241, 0.2);
}

.quick-card:hover::after {
    opacity: 1;
}

.quick-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: block;
}

.quick-card h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.quick-card p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
}

/* Stats Overview */
.stats-overview {
    margin-bottom: 3rem;
}

.stats-overview h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 300;
}

.stats-overview .stats-grid {
    max-width: 1000px;
    margin: 0 auto;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-light);
}

.section-header h3, .section-header h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.section-header h3 i, .section-header h4 i {
    color: var(--primary-color);
    font-size: 1.25rem;
}

.section-stats {
    display: flex;
    gap: 1rem;
}

.stat-badge {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
}

/* Approvals Grid */
.approvals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.approval-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.approval-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--warning-color), var(--accent-color));
}

.approval-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--warning-color);
}

.approval-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

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

.approval-header h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
}

.approval-details {
    margin-bottom: 1.5rem;
}

.approval-details p {
    margin: 0.5rem 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.approval-details p i {
    color: var(--primary-color);
    margin-right: 0.5rem;
    width: 16px;
}

.approval-actions {
    text-align: center;
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border: none;
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 16px rgba(16, 185, 129, 0.3);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-success:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
    background: linear-gradient(135deg, #059669 0%, var(--success-color) 100%);
}

.btn-success:active {
    transform: translateY(0) scale(0.98);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 0.875rem 2rem;
    border-radius: var(--radius-lg);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Form Cards */
.form-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    margin-bottom: 2rem;
}

.form-card h4 {
    margin: 0 0 2rem 0;
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.form-card h4 i {
    color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

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

/* Course Management Tabs */
.course-management-tabs {
    display: flex;
    margin-bottom: 2rem;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    background: var(--bg-secondary);
}

.course-management-tabs .tab-btn {
    flex: 1;
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.course-management-tabs .tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-sm);
}

.course-management-tabs .tab-btn:hover:not(.active) {
    background: var(--bg-primary);
    color: var(--text-primary);
}

/* Data Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    margin-top: 1rem;
}

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

.data-table th {
    padding: 1.25rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.data-table td {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
    border-right: 1px solid var(--border-light);
}

.data-table td:last-child {
    border-right: none;
}

.data-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

.data-table tbody tr:hover {
    background: var(--bg-secondary);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* Users Table Styling */
.users-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    background: var(--bg-primary);
}

.users-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

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

.users-table th {
    padding: 1.25rem 1rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--primary-color);
}

.users-table td {
    padding: 1.25rem 1rem;
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
    border-right: 1px solid var(--border-light);
}

.users-table td:last-child {
    border-right: none;
}

.users-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* Charts Styling */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

/* Responsive charts grid */
@media (min-width: 1200px) {
    .charts-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 1024px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1.25rem;
    }
}

@media (max-width: 768px) {
    .charts-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: 1rem;
    }
}

.chart-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
}

.chart-container h4 {
    margin: 0 0 1.5rem 0;
    color: var(--text-primary);
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.chart-container h4 i {
    color: var(--primary-color);
}

.chart-container canvas {
    max-height: 300px;
}

/* User Info in Tables */
.user-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

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

/* Amount Styling */
.amount {
    font-weight: 600;
    color: var(--success-color);
    font-size: 1.1rem;
}

/* Transaction ID */
.transaction-id {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    background: var(--bg-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
}

/* Status Badges */
.status-badge {
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.status-badge.status-paid {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
}

.status-badge.status-pending {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
    color: white;
}

.status-badge.status-failed {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
    color: white;
}

/* Approved/Pending Status */
.approved {
    color: var(--success-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pending {
    color: var(--warning-color);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Payments Table Container */
.payments-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* Progress Overview Section */
.progress-overview {
    background:
        var(--bg-card),
        linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.95) 100%);
    background-blend-mode: normal, overlay;
    padding: 3rem 2rem;
    border-radius: var(--radius-xl);
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(0, 0, 0, 0.08);
    margin-bottom: 3rem;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.progress-overview h3 {
    margin-bottom: 2rem;
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.progress-overview h3 i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.progress-visualization {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.progress-circle {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.progress-circle svg {
    transform: rotate(-90deg);
}

.progress-text {
    position: absolute;
    text-align: center;
    color: var(--text-primary);
}

.progress-percent {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    line-height: 1;
}

.progress-label {
    display: block;
    font-size: 1rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
    font-weight: 500;
}

.progress-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.progress-stats .stat-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.progress-stats .stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.progress-stats .stat-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.progress-stats .stat-item h4 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.progress-stats .stat-item p {
    margin: 0.25rem 0 0 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.progress-level-badge {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    color: white;
    font-weight: 700;
    font-size: 1rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    margin-bottom: 1rem;
    text-align: center;
}

.level-text {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
}

.progress-details {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.progress-message {
    text-align: center;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.progress-message p {
    margin: 0;
    color: rgba(255, 255, 255, 0.95);
    font-size: 1rem;
    font-weight: 500;
    line-height: 1.5;
}

.weekly-progress {
    background: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.weekly-progress h4 {
    margin: 0 0 1rem 0;
    color: white;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.weekly-bar {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.weekly-fill {
    height: 100%;
    border-radius: 6px;
    transition: width 0.8s ease;
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

.weekly-progress p {
    margin: 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.9rem;
    text-align: center;
}




/* Mobile responsiveness for progress overview */
@media (max-width: 768px) {
    .progress-visualization {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .progress-circle {
        justify-self: center;
    }

    .progress-details {
        gap: 1rem;
    }

    .progress-level-badge {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    .level-text {
        font-size: 0.9rem;
    }

    .progress-message p {
        font-size: 0.9rem;
    }

    .weekly-progress {
        padding: 1rem;
    }

    .weekly-progress h4 {
        font-size: 1rem;
    }

    /* Analytics Overview Mobile */
    .analytics-overview {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-md);
        margin-bottom: var(--space-lg);
    }

    .overview-card {
        padding: var(--space-lg);
    }

    .overview-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }

    .overview-content h4 {
        font-size: 1.5rem;
    }

    .overview-content p {
        font-size: var(--font-size-sm);
    }

    /* Analytics Tabs Mobile */
    .analytics-tabs {
        padding: var(--space-sm);
        gap: var(--space-xs);
    }

    .analytics-tab-btn {
        min-width: 110px;
        padding: var(--space-sm) var(--space-md);
        font-size: var(--font-size-xs);
    }

    .analytics-tab-content {
        padding: var(--space-lg);
    }

    .analytics-tab-content h4 {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-md);
    }
}

@media (max-width: 480px) {
    .analytics-overview {
        grid-template-columns: 1fr;
        gap: var(--space-sm);
    }

    .overview-card {
        padding: var(--space-md);
        text-align: left;
        display: flex;
        align-items: center;
        gap: var(--space-md);
    }

    .overview-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
        margin: 0;
        flex-shrink: 0;
    }

    .overview-content h4 {
        font-size: 1.25rem;
        margin-bottom: var(--space-xs);
    }

    .overview-content p {
        font-size: var(--font-size-xs);
    }

    /* Analytics Tabs Small Mobile */
    .analytics-tabs {
        padding: var(--space-xs);
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .analytics-tab-btn {
        min-width: 100px;
        padding: var(--space-xs) var(--space-sm);
        white-space: nowrap;
        font-size: 11px;
    }

    .analytics-tab-btn i {
        font-size: var(--font-size-sm);
    }

    .analytics-tab-btn span {
        display: none;
    }

    .analytics-tab-content {
        padding: var(--space-md);
    }

    .analytics-tab-content h4 {
        font-size: var(--font-size-sm);
        margin-bottom: var(--space-sm);
    }

    .chart-container {
        padding: var(--space-md);
    }

    .chart-container h4 {
        font-size: var(--font-size-sm);
        margin-bottom: var(--space-sm);
    }
}

/* Achievements Section */
.achievements-section {
    background:
        linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--secondary-color) 100%),
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255,255,255,0.05) 0%, transparent 50%);
    background-blend-mode: normal, overlay, overlay;
    color: white;
    padding: 3rem 2rem;
    border-radius: var(--radius-xl);
    margin-bottom: 3rem;
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(99, 102, 241, 0.3);
    position: relative;
    overflow: hidden;
}

.achievements-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: float 20s linear infinite;
    opacity: 0.3;
}

.achievements-section h3 {
    margin-bottom: 2rem;
    font-size: 1.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.achievements-section h3 i {
    font-size: 1.5rem;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    position: relative;
    z-index: 1;
    justify-items: center;
}

.achievement-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 1rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    min-height: 200px;
    width: 100%;
    max-width: 320px;
}

.achievement-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #ffd700, #ffed4e, #ffd700);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.achievement-card.unlocked::before {
    opacity: 1;
}

.achievement-card.unlocked {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 215, 0, 0.5);
    box-shadow: 0 8px 25px rgba(255, 215, 0, 0.2);
    transform: translateY(-5px);
}

.achievement-card.locked {
    opacity: 0.7;
}

/* Rarity system */
.rarity-common {
    border-color: rgba(156, 163, 175, 0.3);
}

.rarity-uncommon {
    border-color: rgba(34, 197, 94, 0.3);
}

.rarity-rare {
    border-color: rgba(59, 130, 246, 0.3);
}

.rarity-legendary {
    border-color: rgba(245, 158, 11, 0.3);
    box-shadow: 0 0 30px rgba(245, 158, 11, 0.2);
}

.rarity-indicator {
    margin-top: 1rem;
    text-align: center;
}

.rarity-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.rarity-badge.common {
    background: linear-gradient(135deg, #9ca3af, #6b7280);
    color: white;
}

.rarity-badge.uncommon {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: white;
}

.rarity-badge.rare {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: white;
}

.rarity-badge.legendary {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: white;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.4);
}

.achievement-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
}

.achievement-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, rgba(255,255,255,0.2), rgba(255,255,255,0.1));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    border: 3px solid rgba(255, 255, 255, 0.3);
    position: relative;
    margin-bottom: 0.5rem;
}

.achievement-card.unlocked .achievement-icon {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    border-color: #ffd700;
    box-shadow: 0 0 25px rgba(255, 215, 0, 0.6);
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from { box-shadow: 0 0 25px rgba(255, 215, 0, 0.6); }
    to { box-shadow: 0 0 35px rgba(255, 215, 0, 0.8), 0 0 45px rgba(255, 215, 0, 0.4); }
}

.achievement-info h4 {
    margin: 0 0 0.5rem 0;
    font-size: 1.3rem;
    font-weight: 700;
    color: white;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.achievement-info p {
    margin: 0;
    color: rgba(255, 255, 255, 0.95);
    font-size: 0.95rem;
    line-height: 1.5;
    font-weight: 400;
}

.achievement-badge,
.achievement-lock {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.achievement-badge {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    color: #333;
    box-shadow: 0 2px 12px rgba(255, 215, 0, 0.6);
}

.achievement-lock {
    background: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(5px);
}

/* Learning Streak Section */
.streak-section {
    background:
        linear-gradient(135deg, #ff6b35 0%, #ff8c42 50%, #ff6b35 100%),
        radial-gradient(circle at 30% 40%, rgba(255,255,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 60%, rgba(255,255,255,0.05) 0%, transparent 50%);
    background-blend-mode: normal, overlay, overlay;
    color: white;
    padding: 3rem 2rem;
    border-radius: var(--radius-xl);
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(255, 107, 53, 0.3);
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
}

.streak-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 1px, transparent 1px);
    background-size: 40px 40px;
    animation: float 15s linear infinite;
    opacity: 0.2;
}

.streak-section h3 {
    margin-bottom: 2rem;
    font-size: 1.8rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.streak-section h3 i {
    font-size: 1.5rem;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.5));
}

.streak-display {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 3rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.streak-flame {
    font-size: 6rem;
    color: #ffd700;
    animation: flame-flicker 2s ease-in-out infinite alternate;
    filter: drop-shadow(0 0 30px rgba(255, 215, 0, 0.8));
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.6);
    position: relative;
}

.streak-flame::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.3) 0%, transparent 70%);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes flame-flicker {
    0% { transform: scale(1) rotate(-2deg); }
    100% { transform: scale(1.1) rotate(2deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.streak-info {
    text-align: center;
}

.streak-info h4 {
    margin: 0 0 1rem 0;
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.streak-info p {
    margin: 0 0 1.5rem 0;
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
    font-weight: 400;
    line-height: 1.6;
}

.streak-stats {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.streak-stat {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.streak-stat:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.streak-stat i {
    font-size: 1.2rem;
    color: #ffd700;
    filter: drop-shadow(0 0 5px rgba(255, 215, 0, 0.5));
}

.streak-stat span {
    color: white;
    font-weight: 600;
    font-size: 0.9rem;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.flame-particles {
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    pointer-events: none;
}

.flame-particles span {
    position: absolute;
    width: 8px;
    height: 8px;
    background: #ffd700;
    border-radius: 50%;
    opacity: 0.8;
    animation: particle-float 3s ease-in-out infinite;
}

.flame-particles span:nth-child(1) {
    top: 20%;
    left: 30%;
    animation-delay: 0s;
}

.flame-particles span:nth-child(2) {
    top: 60%;
    right: 20%;
    animation-delay: 1s;
}

.flame-particles span:nth-child(3) {
    bottom: 30%;
    left: 50%;
    animation-delay: 2s;
}

@keyframes particle-float {
    0%, 100% {
        transform: translateY(0px) scale(1);
        opacity: 0.8;
    }
    50% {
        transform: translateY(-15px) scale(1.2);
        opacity: 0.4;
    }
}

.streak-calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 0.75rem;
    justify-content: center;
    max-width: 400px;
    margin: 0 auto;
}

.streak-day {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 2px solid rgba(255, 255, 255, 0.2);
    min-width: 60px;
    min-height: 70px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.streak-day::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), rgba(255,255,255,0.05));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.streak-day:hover::before {
    opacity: 1;
}

.streak-day.active {
    background: linear-gradient(135deg, #ffd700, #ffed4e);
    border-color: #ffd700;
    color: #333;
    box-shadow: 0 8px 20px rgba(255, 215, 0, 0.4);
    transform: translateY(-3px) scale(1.05);
}

.streak-day.active::before {
    background: linear-gradient(135deg, rgba(255,255,255,0.3), rgba(255,255,255,0.1));
}

.streak-day span {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    z-index: 1;
}

.streak-day i {
    font-size: 1.2rem;
    color: #333;
    z-index: 1;
    filter: drop-shadow(0 0 5px rgba(0,0,0,0.2));
}

.streak-day .fa-check-circle {
    color: #22c55e;
    filter: drop-shadow(0 0 8px rgba(34, 197, 94, 0.4));
}

.streak-day .fa-circle {
    color: rgba(255, 255, 255, 0.6);
    filter: drop-shadow(0 0 3px rgba(255, 255, 255, 0.3));
}

/* Mobile adjustments for streak section */
@media (max-width: 768px) {
    .streak-display {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .streak-flame {
        font-size: 4rem;
        justify-self: center;
    }

    .streak-calendar {
        grid-template-columns: repeat(7, 1fr);
        gap: 0.5rem;
        max-width: 100%;
    }

    .streak-day {
        min-width: 40px;
        min-height: 50px;
        padding: 0.5rem 0.25rem;
    }

    .streak-day span {
        font-size: 0.7rem;
    }

    .streak-day i {
        font-size: 1rem;
    }

    .streak-stats {
        gap: 1rem;
        margin-bottom: 1.5rem;
    }

    .streak-stat {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }

    .streak-stat i {
        font-size: 1rem;
    }

    .streak-stat span {
        font-size: 0.8rem;
    }
}

/* Course Table Container */
.courses-table-container {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    background: var(--bg-primary);
}

/* Enhanced Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    margin: 2rem 0;
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    opacity: 0.6;
}

.empty-state h4 {
    margin: 0 0 1rem 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 600;
}

.empty-state p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 400px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Professional Student Management Styles */
.course-meta {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1rem 0;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.meta-item i {
    color: var(--primary-color);
    width: 16px;
}

.card-actions {
    margin-top: auto;
    padding-top: 1.5rem;
}

.action-links {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.action-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.action-link:hover {
    color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.action-link i {
    font-size: 0.8rem;
}

.course-info {
    text-align: center;
    flex: 1;
}

.course-info h2 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
    font-size: 1.8rem;
    font-weight: 700;
}

.course-subtitle {
    margin: 0;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 400;
}

.progress-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    min-width: 120px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-percentage {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

.performance-metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    min-width: 80px;
}

.metric-number {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.metric-grade, .metric-score {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.metric-grade {
    color: var(--success-color);
}

.metric-score {
    color: var(--warning-color);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
    border: none;
}

.btn-success:hover {
    background: linear-gradient(135deg, #059669, var(--success-color));
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.3);
}

.btn-danger {
    background: linear-gradient(135deg, var(--error-color), var(--error-dark));
    color: white;
    border: none;
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--error-dark), var(--error-color));
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(239, 68, 68, 0.3);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-primary);
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Enhanced Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-top: 1.5rem;
}

.quick-actions .btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem 1rem;
    text-align: center;
    min-height: 80px;
    justify-content: center;
}

.quick-actions .btn i {
    font-size: 1.5rem;
}

.quick-actions .btn span {
    font-size: 0.9rem;
    font-weight: 500;
}

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Analytics Tabs */
.analytics-tabs {
    display: flex;
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(248,250,252,0.95) 100%);
    border-radius: var(--radius-xl);
    padding: var(--space-sm);
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.8);
    margin-bottom: var(--space-xl);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    backdrop-filter: blur(10px);
    position: relative;
}

.analytics-tabs::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.analytics-tab-btn {
    flex: 1;
    min-width: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-xl);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    white-space: nowrap;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    overflow: hidden;
}

.analytics-tab-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99,102,241,0.1), transparent);
    transition: left 0.5s ease;
}

.analytics-tab-btn:hover::before {
    left: 100%;
}

.analytics-tab-btn:hover {
    background: rgba(99, 102, 241, 0.05);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.analytics-tab-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    box-shadow:
        0 4px 16px rgba(99, 102, 241, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.analytics-tab-btn.active::before {
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
}

.analytics-tab-btn i {
    font-size: var(--font-size-xl);
    transition: transform var(--transition-fast);
}

.analytics-tab-btn:hover i {
    transform: scale(1.1);
}

.analytics-tab-btn span {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.analytics-tab-content {
    display: none;
    animation: fadeIn 0.5s ease-out;
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(0, 0, 0, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    margin-top: var(--space-lg);
}

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

.analytics-tab-content h4 {
    margin: 0 0 var(--space-lg) 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--border-light);
}

.analytics-tab-content h4 i {
    color: var(--primary-color);
    font-size: var(--font-size-lg);
}

/* Mobile Analytics Tabs */
@media (max-width: 768px) {
    .analytics-tabs {
        flex-wrap: wrap;
        justify-content: center;
        padding: var(--space-sm);
        gap: var(--space-xs);
    }

    .analytics-tab-btn {
        flex: 1 1 auto;
        min-width: 110px;
        padding: var(--space-md) var(--space-sm);
        font-size: var(--font-size-xs);
        border-radius: var(--radius-md);
    }

    .analytics-tab-btn i {
        font-size: var(--font-size-lg);
    }

    .analytics-tab-btn span {
        display: none;
    }

    .analytics-tab-content {
        padding: var(--space-lg);
        margin-top: var(--space-md);
    }

    .analytics-tab-content h4 {
        font-size: var(--font-size-base);
        margin-bottom: var(--space-md);
    }
}

@media (max-width: 480px) {
    .analytics-tabs {
        padding: var(--space-xs);
    }

    .analytics-tab-btn {
        min-width: 90px;
        padding: var(--space-sm) var(--space-xs);
    }

    .analytics-tab-btn i {
        font-size: var(--font-size-base);
    }

    .analytics-tab-content {
        padding: var(--space-md);
    }
}

/* Mobile-First Responsive Design */

/* Mobile Navigation */
@media (max-width: 768px) {
    /* Header */
    header {
        padding: 1rem;
        position: relative;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .logo-section {
        width: 100%;
        justify-content: center;
    }

    .logo {
        height: 50px;
    }

    .brand h1 {
        font-size: 1.5rem;
    }

    .tagline {
        font-size: 0.8rem;
    }

    nav {
        margin-top: 0.5rem;
        width: 100%;
    }

    nav a {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
        white-space: nowrap;
    }

    /* Main Content */
    main {
        padding: 0 0.5rem;
    }

    /* Hero Section */
    .hero {
        padding: 2rem 1rem;
        margin-bottom: 2rem;
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: 0.5rem;
    }

    .primary-btn, .secondary-btn {
        width: 100%;
        justify-content: center;
    }

    /* Stats Grid */
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .stat-card {
        padding: 1.5rem;
    }

    .stat-icon {
        font-size: 2rem;
        margin-right: 1rem;
    }

    .stat-info h3 {
        font-size: 1.8rem;
    }

    /* Course Grid */
    .courses-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .course-card {
        padding: 1rem;
    }

    .course-card h3 {
        font-size: 1.2rem;
    }

    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-card {
        padding: 1.5rem;
    }

    /* CTA Section */
    .cta-section {
        padding: 2rem 1rem;
    }

    .cta-content h3 {
        font-size: 1.8rem;
    }

    /* Admin Navigation */
    .admin-nav-container {
        flex-wrap: wrap;
        padding: 0.5rem;
        gap: 0.25rem;
    }

    .nav-link {
        flex: 1 1 auto;
        min-width: 80px;
        padding: 0.5rem 0.25rem;
        font-size: 0.8rem;
        justify-content: center;
    }

    .nav-link span {
        display: none;
    }

    .nav-link i {
        font-size: 1rem;
    }

    /* Admin Sections */
    .admin-section {
        padding: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .admin-section h3 {
        font-size: 1.25rem;
        margin-bottom: 1rem;
    }

    /* Forms */
    .admin-section form {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .admin-section button {
        grid-column: 1;
        width: 100%;
    }

    /* Tables */
    .progress-table, .payments-table-container {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .progress-table table, .data-table {
        min-width: 600px;
        font-size: 0.85rem;
    }

    .progress-table th,
    .progress-table td,
    .data-table th,
    .data-table td {
        padding: 0.5rem;
        white-space: nowrap;
    }

    /* Course Management */
    .courses-management-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .course-management-card {
        padding: 1rem;
    }

    .course-info h4 {
        font-size: 1.1rem;
    }

    /* Approvals */
    .approvals-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .approval-card {
        padding: 1.5rem;
    }

    /* Quick Access */
    .quick-access-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .quick-card {
        padding: 1.5rem;
    }

    .quick-card i {
        font-size: 2.5rem;
    }

    .quick-card h3 {
        font-size: 1.1rem;
    }

    /* Buttons */
    .btn, .btn-small {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
    }

    /* Course Navigation */
    .course-navigation {
        flex-direction: column;
        gap: 0.5rem;
        padding: 0.5rem;
    }

    .course-navigation h2 {
        font-size: 1.5rem;
    }

    /* Lessons and Materials */
    .lessons-list, .materials-list {
        gap: 0.5rem;
    }

    .lesson-card, .material-card {
        padding: 1rem;
    }

    .lesson-card h4, .material-card h4 {
        font-size: 1.1rem;
    }

    /* Footer */
    footer {
        padding: 1.5rem 1rem;
        text-align: center;
    }

    footer p {
        font-size: 0.8rem;
    }
}

/* Tablet Adjustments */
@media (max-width: 1024px) and (min-width: 769px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .quick-access-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .approvals-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .admin-nav-container {
        padding: 0.75rem 1rem;
        gap: 0.5rem;
    }

    .nav-link {
        padding: 0.75rem 1rem;
        font-size: 0.85rem;
    }
}

/* Analytics Overview Cards */
.analytics-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.overview-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, rgba(248,250,252,0.95) 100%);
    border: 1px solid rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    text-align: center;
    box-shadow:
        var(--shadow-lg),
        0 0 40px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.overview-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow:
        var(--shadow-xl),
        0 0 60px rgba(99, 102, 241, 0.15);
}

.overview-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--space-md) auto;
    color: white;
    font-size: 1.5rem;
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.3);
}

.overview-content h4 {
    margin: 0 0 var(--space-xs) 0;
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.overview-content p {
    margin: 0;
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    font-weight: 500;
}

/* Enhanced User Management Styles */
.enhanced-tabs {
    margin-bottom: var(--space-xl);
}

.tab-navigation {
    display: flex;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xs);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.tab-nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

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

.tab-nav-btn.active {
    background: var(--primary-color);
    color: white;
    box-shadow: var(--shadow-sm);
}

.tab-nav-btn i {
    font-size: var(--font-size-lg);
}

.tab-nav-btn span {
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.tab-panel {
    display: none;
    animation: fadeIn 0.3s ease-in-out;
}

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

/* Form Styles */
.form-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

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

.form-header h4 {
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
    font-size: var(--font-size-xl);
}

.form-header p {
    color: var(--text-secondary);
    margin: 0;
}

.enhanced-form {
    max-width: none;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.form-group label i {
    color: var(--primary-color);
    width: 16px;
}

.form-group input,
.form-group select {
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
    background: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 91, 150, 0.1);
}

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

.form-hint {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-top: var(--space-xs);
    font-style: italic;
}

.checkbox-group {
    margin: var(--space-lg) 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
    gap: var(--space-sm);
}

.checkbox-label input[type="checkbox"] {
    display: none;
}

.checkmark {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    position: relative;
    transition: all var(--transition-fast);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.checkbox-label input[type="checkbox"]:checked + .checkmark::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 12px;
    font-weight: bold;
}

.checkbox-text {
    color: var(--text-primary);
}

.form-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.btn-large {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

/* Table Controls */
.table-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-lg);
    gap: var(--space-md);
    flex-wrap: wrap;
}

.search-box {
    position: relative;
    flex: 1;
    min-width: 250px;
}

.search-box i {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.search-box input {
    width: 100%;
    padding: var(--space-md) var(--space-md) var(--space-md) 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    transition: all var(--transition-fast);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 91, 150, 0.1);
}

.filter-controls {
    display: flex;
    gap: var(--space-md);
}

.filter-controls select {
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    background: white;
    font-size: var(--font-size-base);
    min-width: 120px;
}

/* Enhanced Table Styles */
.enhanced-table-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.enhanced-users-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.enhanced-users-table thead {
    background: var(--bg-secondary);
}

.enhanced-users-table th {
    padding: var(--space-lg) var(--space-md);
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
}

.enhanced-users-table th i {
    margin-right: var(--space-xs);
    color: var(--primary-color);
}

.enhanced-users-table td {
    padding: var(--space-lg) var(--space-md);
    border-bottom: 1px solid var(--border-light);
    vertical-align: middle;
}

.enhanced-users-table tbody tr:hover {
    background: var(--bg-secondary);
    transition: background var(--transition-fast);
}

.user-id {
    font-weight: 600;
    color: var(--primary-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: var(--font-size-xl);
}

.user-details {
    flex: 1;
}

.user-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-xs);
}

.user-email {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.role-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

.role-student {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

.role-instructor {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.role-admin {
    background: rgba(220, 53, 69, 0.1);
    color: var(--error-color);
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 600;
}

.status-active {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

.status-inactive {
    background: rgba(108, 117, 125, 0.1);
    color: var(--text-secondary);
}

.user-created {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.user-created i {
    margin-right: var(--space-xs);
}

.user-actions {
    text-align: center;
}

.action-buttons {
    display: flex;
    gap: var(--space-xs);
    justify-content: center;
}

.btn-action {
    padding: var(--space-sm);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
}

.btn-edit {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.btn-edit:hover {
    background: var(--warning-color);
    color: white;
    transform: scale(1.1);
}

.btn-status {
    background: rgba(0, 123, 255, 0.1);
    color: #007bff;
}

.btn-status:hover {
    background: #007bff;
    color: white;
    transform: scale(1.1);
}

.btn-delete {
    background: rgba(220, 53, 69, 0.1);
    color: var(--error-color);
}

.btn-delete:hover {
    background: var(--error-color);
    color: white;
    transform: scale(1.1);
}


/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design for User Management */
@media (max-width: 768px) {
    .tab-navigation {
        flex-direction: column;
    }

    .tab-nav-btn {
        width: 100%;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .table-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .search-box {
        min-width: auto;
    }

    .filter-controls {
        justify-content: center;
    }

    .user-info {
        flex-direction: column;
        text-align: center;
        gap: var(--space-sm);
    }

    .user-details {
        text-align: center;
    }

    .action-buttons {
        flex-wrap: wrap;
    }

    .enhanced-users-table th,
    .enhanced-users-table td {
        padding: var(--space-sm);
        font-size: var(--font-size-xs);
    }

    .user-avatar {
        width: 32px;
        height: 32px;
        font-size: var(--font-size-lg);
    }
}

/* Progress Bar Styles */
.progress-cell {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    min-width: 200px;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-fill.completed {
    background: var(--success-color);
}

.progress-fill.good {
    background: #28a745;
}

.progress-fill.moderate {
    background: var(--warning-color);
}

.progress-fill.pending {
    background: var(--error-color);
}

.progress-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--text-secondary);
}

/* Status Badge Styles */
.status-badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.status-active {
    background-color: var(--success-color);
    color: white;
}

.status-inactive {
    background-color: var(--text-muted);
    color: white;
}

.status-scheduled {
    background-color: var(--warning-color);
    color: white;
}

.status-expired {
    background-color: var(--error-color);
    color: white;
}

.status-confirmed {
    background-color: var(--success-color);
    color: white;
}

.status-pending {
    background-color: var(--warning-color);
    color: white;
}

.status-paid {
    background-color: var(--success-color);
    color: white;
}

.status-cash_pending {
    background-color: var(--warning-color);
    color: white;
}

.status-completed {
    background: linear-gradient(135deg, var(--success-color), #059669);
    color: white;
}

.status-in-progress {
    background: linear-gradient(135deg, var(--warning-color), #d97706);
    color: white;
}

/* Small Mobile Phones */
@media (max-width: 480px) {
    header {
        padding: 0.75rem;
    }

    .logo {
        height: 40px;
    }

    .brand h1 {
        font-size: 1.25rem;
    }

    .tagline {
        font-size: 0.75rem;
    }

    nav a {
        padding: 0.4rem 0.75rem;
        font-size: 0.8rem;
    }

    main {
        padding: 0 0.25rem;
    }

    .hero {
        padding: 1.5rem 0.75rem;
    }

    .hero h2 {
        font-size: 1.75rem;
    }

    .hero p {
        font-size: 0.9rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .stat-card {
        padding: 1rem;
        flex-direction: column;
        text-align: center;
    }

    .stat-icon {
        margin-right: 0;
        margin-bottom: 0.5rem;
    }

    .courses-grid {
        gap: 0.75rem;
    }

    .course-card {
        padding: 0.75rem;
    }

    .admin-section {
        padding: 1rem;
        margin-bottom: 1rem;
    }

    .admin-section h3 {
        font-size: 1.1rem;
    }

    .btn, .btn-small {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
    }

    .data-table {
        font-size: 0.8rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.4rem 0.3rem;
    }

    /* User Management Mobile Styles */
    .form-container {
        padding: var(--space-lg);
    }

    .form-header h4 {
        font-size: var(--font-size-lg);
    }

    .form-actions {
        flex-direction: column;
    }

    .btn-large {
        width: 100%;
    }

    .enhanced-users-table {
        font-size: 0.75rem;
    }

    .user-info {
        min-width: 0;
    }

    .user-name,
    .user-email {
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        max-width: 120px;
    }
}