:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --accent-color: #10b981;
    --danger-color: #ef4444;
    --border-color: #334155;
    --font-family: 'Inter', sans-serif;
    --radius: 8px;
    --transition: 0.3s ease;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
}
p {
    color: var(--text-muted);
}
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--primary-hover);
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}
.brand .highlight {
    color: var(--primary-color);
}
.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}
.nav-links a {
    color: var(--text-color);
    font-weight: 500;
}
.nav-links a:hover {
    color: var(--primary-color);
}

/* Layout */
.main-content {
    flex: 1;
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
    width: 100%;
}
footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-muted);
}

/* Buttons */
.btn-primary, .btn-outline, .btn-danger, .btn-success {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
}
.btn-primary {
    background-color: var(--primary-color);
    color: #fff !important;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}
.btn-outline {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color) !important;
}
.btn-outline:hover {
    background-color: var(--border-color);
}
.btn-danger { background-color: var(--danger-color); color: white; }
.btn-success { background-color: var(--accent-color); color: white; }

/* Cards & Forms */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.form-group {
    margin-bottom: 1rem;
}
.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}
.form-control {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-color);
    transition: var(--transition);
}
.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}
.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}
.alert-success {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

/* Grid System */
.grid {
    display: grid;
    gap: 1.5rem;
}
.grid-cols-1 { grid-template-columns: 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); }

@media (max-width: 768px) {
    .grid-cols-2, .grid-cols-3, .grid-cols-4 {
        grid-template-columns: 1fr;
    }
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Dashboard Stats */
.stat-card {
    text-align: center;
}
.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-color);
}

/* Video Grid */
.video-card {
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.video-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    background-color: #000;
    border-bottom: 1px solid var(--border-color);
}
.video-info {
    padding: 1rem;
    flex: 1;
}
.video-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Watch Page */
.watch-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.5rem;
}
.video-player-container {
    background-color: #000;
    border-radius: var(--radius);
    overflow: hidden;
    position: relative;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
}
.video-player-container video,
.video-player-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}
.ad-slot {
    background-color: var(--card-bg);
    border: 1px dashed var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    border-radius: var(--radius);
}
.ad-vertical {
    min-height: 600px;
}
.ad-horizontal {
    min-height: 100px;
    margin: 1.5rem 0;
}

@media (max-width: 992px) {
    .watch-container {
        grid-template-columns: 1fr;
    }
    .ad-vertical {
        min-height: 250px;
    }
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
th {
    font-weight: 600;
    color: var(--text-muted);
}