:root {
    --bg-base: #0f172a;
    --bg-surface: rgba(30, 41, 59, 0.7);
    --bg-surface-hover: rgba(30, 41, 59, 0.9);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.5);
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 255, 255, 0.15);
    
    --gradient-1: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-2: linear-gradient(135deg, #ef4444, #f97316);
    --gradient-3: linear-gradient(135deg, #10b981, #3b82f6);
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px var(--accent-glow);
    
    --radius-md: 12px;
    --radius-lg: 20px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* Background Glow Effects */
.glow-bg {
    position: fixed;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.4;
    animation: float 10s infinite alternate ease-in-out;
}

.glow-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: rgba(59, 130, 246, 0.3);
}

.glow-2 {
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: rgba(139, 92, 246, 0.25);
    animation-delay: -5s;
}

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, 50px) scale(1.1); }
}

/* Typography */
h1, h2, h3, h4 {
    font-family: 'Outfit', sans-serif;
    line-height: 1.2;
    margin-bottom: 0.5rem;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

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

/* Navigation */
.navbar {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    font-size: 1.5rem;
    transition: var(--transition);
}

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

.logo-yt {
    color: #ef4444;
}

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

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-links a:hover::after, .nav-links a.active::after {
    width: 100%;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.hero {
    text-align: center;
    padding: 6rem 0 4rem;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Dashboard & Filtering */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.filter-controls {
    display: flex;
    gap: 0.5rem;
    background: rgba(0,0,0,0.2);
    padding: 0.5rem;
    border-radius: 100px;
    border: 1px solid var(--border-color);
}

.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1.25rem;
    border-radius: 100px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    font-size: 0.9rem;
    transition: var(--transition);
}

.filter-btn:hover {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.filter-btn.active {
    background: var(--bg-surface-hover);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-highlight);
}

/* Grid System */
.channels-grid, .videos-list {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    padding-bottom: 4rem;
}

/* Cards (Glassmorphism) */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-1);
    opacity: 0;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
    background: var(--bg-surface-hover);
    border-color: var(--border-highlight);
    box-shadow: var(--shadow-md);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.card-title h3 {
    font-size: 1.25rem;
}

.card-score {
    background: rgba(255,255,255,0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-weight: 700;
    font-size: 1.1rem;
}

.card-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

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

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-neutral { background: rgba(148, 163, 184, 0.2); color: #cbd5e1; }
.badge-left { background: rgba(59, 130, 246, 0.2); color: #93c5fd; }
.badge-right { background: rgba(239, 68, 68, 0.2); color: #fca5a5; }

/* Video Card Specifics */
.video-card {
    padding: 0;
}

.video-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.video-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.video-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-summary {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    flex: 1;
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.metric {
    text-align: center;
    background: rgba(0,0,0,0.2);
    padding: 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.metric-val {
    display: block;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
}

.metric-name {
    font-size: 0.65rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

/* Channel Header Card */
.channel-header-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    text-align: center;
    backdrop-filter: blur(12px);
    margin: 4rem 0 3rem;
    position: relative;
    overflow: hidden;
}

.channel-header-card h1 {
    font-size: 3rem;
}

.channel-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-top: 2rem;
}

.stat-box .stat-label {
    display: block;
    margin-bottom: 0.5rem;
}

.stat-box .stat-value {
    font-size: 2rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    color: var(--text-primary);
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem;
    width: 100%;
    grid-column: 1 / -1;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255,255,255,0.1);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

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

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .channel-header-card h1 { font-size: 2rem; }
    .channels-grid, .videos-list { grid-template-columns: 1fr; }
    .dashboard-header { flex-direction: column; align-items: flex-start; }
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
}