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

:root {
    --primary-color: #00ff88;
    --primary-dark: #00cc6a;
    --primary-light: #33ffaa;
    --secondary-color: #1a1a1a;
    --accent-color: #ff6b6b;
    --accent-dark: #ff4757;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-muted: #666666;
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-card: rgba(26, 26, 26, 0.8);
    --border-color: #333333;
    --border-light: #444444;
    --success-color: #00ff88;
    --warning-color: #ffaa00;
    --error-color: #ff4757;
    --info-color: #3742fa;
    
    --gradient-primary: linear-gradient(135deg, #00ff88 0%, #00cc6a 100%);
    --gradient-secondary: linear-gradient(135deg, #ff6b6b 0%, #ff4757 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a1a 0%, #2a2a2a 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 255, 136, 0.1) 0%, rgba(255, 107, 107, 0.1) 100%);
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
    --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;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --spacing-20: 5rem;
    
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(0, 255, 136, 0.3);
    --shadow-glow-red: 0 0 20px rgba(255, 71, 87, 0.3);
    --shadow-glow-blue: 0 0 20px rgba(55, 66, 250, 0.3);
    
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
    --transition-bounce: 300ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-spring: 400ms cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

body {
    font-family: var(--font-family);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

.animated-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 255, 136, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 136, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: gridMove 20s linear infinite;
}

.bg-particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 255, 136, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 107, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(55, 66, 250, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 60% 60%, rgba(255, 170, 0, 0.05) 0%, transparent 50%);
    animation: particleFloat 30s ease-in-out infinite;
}

@keyframes gridMove {
    0% { transform: translate(0, 0); }
    100% { transform: translate(50px, 50px); }
}

@keyframes particleFloat {
    0%, 100% { 
        transform: translateY(0px) rotate(0deg) scale(1);
        opacity: 0.7;
    }
    25% { 
        transform: translateY(-15px) rotate(90deg) scale(1.1);
        opacity: 1;
    }
    50% { 
        transform: translateY(-20px) rotate(180deg) scale(1);
        opacity: 0.8;
    }
    75% { 
        transform: translateY(-10px) rotate(270deg) scale(1.05);
        opacity: 0.9;
    }
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-4);
    letter-spacing: -0.025em;
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
    margin-bottom: var(--spacing-4);
    color: var(--text-secondary);
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all var(--transition-fast);
    position: relative;
}

a:hover {
    color: var(--primary-light);
    transform: translateY(-1px);
}

.header {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-4) 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-normal);
}

.header:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-8);
}

/* Enhanced Logo */
.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition-bounce);
    position: relative;
}

.logo-link:hover {
    transform: scale(1.05);
}

.logo-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-spring);
}

.logo-link:hover::after {
    width: 100%;
}

.header-logo-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-glow);
    transition: all var(--transition-spring);
}

.header-logo-image {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.logo-link:hover .header-logo-icon {
    transform: rotate(5deg) scale(1.1);
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.5);
}

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

.header-logo-title {
    font-size: var(--font-size-xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.header-logo-subtitle {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Enhanced Navigation */
.main-nav {
    display: flex;
    gap: var(--spacing-2);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-spring);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--transition-spring);
    z-index: -1;
}

.nav-link:hover::before {
    left: 0;
}

.nav-link:hover {
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-link i {
    font-size: var(--font-size-sm);
    transition: transform var(--transition-bounce);
}

.nav-link:hover i {
    transform: scale(1.2);
}

/* Dropdown Navigation */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.nav-dropdown-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-spring);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
    font-size: inherit;
}

.nav-dropdown-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--transition-spring);
    z-index: -1;
}

.nav-dropdown-btn:hover::before {
    left: 0;
}

.nav-dropdown-btn:hover {
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.nav-dropdown-btn i {
    font-size: var(--font-size-sm);
    transition: transform var(--transition-bounce);
}

.nav-dropdown-btn:hover i {
    transform: scale(1.2);
}

.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: var(--spacing-2);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-xl);
    min-width: 220px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-spring);
    z-index: 1000;
    padding: var(--spacing-2);
}

.nav-dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: all var(--transition-spring);
    position: relative;
    overflow: hidden;
}

.nav-dropdown-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--transition-spring);
    z-index: -1;
}

.nav-dropdown-item:hover::before {
    left: 0;
}

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

.nav-dropdown-item i {
    font-size: var(--font-size-sm);
    transition: transform var(--transition-bounce);
}

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

/* Enhanced Header Actions */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.session-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

.session-timer {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(10px);
    transition: all var(--transition-spring);
    cursor: pointer;
}

.session-timer:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary-color);
}

.timer-icon {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-size: var(--font-size-sm);
    animation: pulse 2s infinite;
}

.timer-content {
    display: flex;
    flex-direction: column;
}

.timer-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.timer-value {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.session-timer.warning .timer-icon {
    background: var(--gradient-secondary);
    animation: pulse 1s infinite;
}

.session-timer.normal .timer-icon {
    background: var(--gradient-primary);
}

.session-timer.expired .timer-icon {
    background: var(--gradient-secondary);
    animation: pulse 0.5s infinite;
}

@keyframes pulse {
    0%, 100% { 
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.7);
    }
    50% { 
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(0, 255, 136, 0);
    }
}

/* Enhanced User Menu */
.user-menu {
    position: relative;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-spring);
    backdrop-filter: blur(10px);
}

.user-menu-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    border-color: var(--primary-color);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--bg-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.username {
    font-weight: 600;
    color: var(--text-primary);
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-2);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-xl);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-spring);
    z-index: 1000;
}

.user-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-spring);
    border-bottom: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    margin: var(--spacing-1) var(--spacing-2);
}

.dropdown-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--transition-spring);
    z-index: -1;
    border-radius: var(--radius-lg);
}

.dropdown-item:hover::before {
    left: 0;
}

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

.dropdown-item:hover {
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.dropdown-item i {
    width: 16px;
    text-align: center;
    color: var(--primary-color);
    transition: transform var(--transition-bounce);
}

.dropdown-item:hover i {
    transform: scale(1.2);
}

/* Enhanced Auth Buttons */
.auth-buttons {
    display: flex;
    gap: var(--spacing-3);
}

/* Enhanced Main Content */
.main {
    flex: 1 0 auto;
    padding: var(--spacing-8) 0;
    position: relative;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
}

/* Enhanced Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--spacing-8);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-spring);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    margin-bottom: var(--spacing-6);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-2);
}

.card-subtitle {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
}

/* Enhanced Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-6);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    cursor: pointer;
    transition: all var(--transition-spring);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    transition: left var(--transition-spring);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

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

.btn-primary {
    background: var(--gradient-primary);
    border-color: var(--primary-color);
    color: var(--bg-primary);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow);
    transform: translateY(-3px);
}

.btn-secondary {
    background: var(--gradient-secondary);
    border-color: var(--accent-color);
    color: var(--bg-primary);
}

.btn-secondary:hover {
    box-shadow: var(--shadow-glow-red);
    transform: translateY(-3px);
}

.btn-danger {
    background: var(--gradient-secondary);
    border-color: var(--error-color);
    color: var(--bg-primary);
}

.btn-danger:hover {
    box-shadow: var(--shadow-glow-red);
    transform: translateY(-3px);
}

.btn-sm {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-xs);
}

.btn-lg {
    padding: var(--spacing-4) var(--spacing-8);
    font-size: var(--font-size-base);
}

/* Enhanced Form Elements */
.form-group {
    margin-bottom: var(--spacing-6);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.form-input {
    width: 100%;
    padding: var(--spacing-4);
    background: var(--bg-tertiary);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-xl);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: all var(--transition-spring);
    backdrop-filter: blur(10px);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.1);
    background: var(--bg-secondary);
    transform: translateY(-1px);
}

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

/* Enhanced Flash Messages */
.flash-messages {
    position: fixed;
    top: 100px;
    right: var(--spacing-6);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3);
    max-width: 400px;
}

.flash-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4) var(--spacing-6);
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-lg);
    animation: slideIn var(--transition-spring);
    position: relative;
    overflow: hidden;
}

.flash-message::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-primary);
}

.flash-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.flash-content {
    flex: 1;
}

.flash-message-text {
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--flash-text-color, var(--text-primary));
    transition: color var(--transition-fast);
}

.flash-close {
    background: none;
    border: none;
    color: var(--flash-close-color, var(--text-muted));
    cursor: pointer;
    padding: var(--spacing-1);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.flash-close:hover {
    color: var(--flash-close-hover-color, var(--text-primary));
    background: var(--bg-tertiary);
}

.flash-success {
    border-color: var(--success-color);
}

.flash-success::before {
    background: var(--gradient-primary);
}

.flash-error {
    border-color: var(--error-color);
}

.flash-error::before {
    background: var(--gradient-secondary);
}

.flash-warning {
    border-color: var(--warning-color);
}

.flash-warning::before {
    background: linear-gradient(135deg, var(--warning-color), #ff8c00);
}

.flash-info {
    border-color: var(--info-color);
}

.flash-info::before {
    background: var(--gradient-glow-blue);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Enhanced Grid System */
.grid {
    display: grid;
    gap: var(--spacing-6);
}

.grid-cols-1 { grid-template-columns: repeat(1, 1fr); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

/* Enhanced Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--spacing-2); }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-6 { margin-bottom: var(--spacing-6); }
.mb-8 { margin-bottom: var(--spacing-8); }

.mt-0 { margin-top: 0; }
.mt-2 { margin-top: var(--spacing-2); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-6 { margin-top: var(--spacing-6); }
.mt-8 { margin-top: var(--spacing-8); }

.p-0 { padding: 0; }
.p-4 { padding: var(--spacing-4); }
.p-6 { padding: var(--spacing-6); }
.p-8 { padding: var(--spacing-8); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }

.gap-2 { gap: var(--spacing-2); }
.gap-4 { gap: var(--spacing-4); }
.gap-6 { gap: var(--spacing-6); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* Enhanced Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-6) 0 var(--spacing-4);
    position: relative;
    flex-shrink: 0;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-6);
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
}

.footer-section h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-6);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-4);
}

.footer-logo i {
    font-size: var(--font-size-2xl);
    color: var(--primary-color);
}

.footer-logo span {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.footer-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-4);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-3);
}

.footer-links a {
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

.social-links {
    display: flex;
    gap: var(--spacing-4);
}

.social-link {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-spring);
    backdrop-filter: blur(10px);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: var(--bg-primary);
    transform: translateY(-3px);
    box-shadow: var(--shadow-glow);
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-4) var(--spacing-6) 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
}

/* Enhanced Loading Animation */
.loading {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-light);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Enhanced Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    animation: fadeIn 0.3s ease-out;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-4);
    color: var(--text-primary);
}

.loading-spinner .loading {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-light);
    border-top: 3px solid var(--primary-color);
}

.loading-spinner p {
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin: 0;
}

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

/* Enhanced Header Scroll Effect */
.header {
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--spacing-4) 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    transition: all var(--transition-normal);
}

.header:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

/* Enhanced Navigation Active State */
.nav-link.active {
    background: var(--gradient-primary);
    color: var(--bg-primary);
    box-shadow: var(--shadow-glow);
}

.nav-link.active i {
    transform: scale(1.2);
}

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

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: var(--radius-lg);
}

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

/* Enhanced Responsive Design */
@media (max-width: 1024px) {
    .header-content {
        gap: var(--spacing-4);
    }
    
    .main-nav {
        gap: var(--spacing-1);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-8);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: var(--spacing-4);
        padding: var(--spacing-4) var(--spacing-6);
    }
    
    .header-logo-text {
        display: none;
    }
    
    .session-info {
        flex-direction: column;
        gap: var(--spacing-3);
    }
    
    .main-nav {
        flex-direction: column;
        gap: var(--spacing-2);
        width: 100%;
    }
    
    .nav-dropdown {
        width: 100%;
    }
    
    .nav-dropdown-btn {
        width: 100%;
        justify-content: center;
    }
    
    .nav-dropdown-menu {
        position: static;
        margin-top: var(--spacing-2);
        width: 100%;
        opacity: 1;
        visibility: visible;
        transform: none;
        display: none;
    }
    
    .nav-dropdown-menu.active {
        display: block;
    }
    
    .container {
        padding: 0 var(--spacing-4);
    }
    
    .card {
        padding: var(--spacing-6);
    }
    
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    
    .flash-messages {
        right: var(--spacing-4);
        left: var(--spacing-4);
        max-width: none;
    }
}

@media (max-width: 480px) {
    .card {
        padding: var(--spacing-4);
    }
    
    .btn {
        padding: var(--spacing-3) var(--spacing-4);
        font-size: var(--font-size-xs);
    }
    
    .header-logo-icon {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-lg);
    }
    
    .header-logo-title {
        font-size: var(--font-size-lg);
    }
}