:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --danger-color: #ef4444;
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(at 0% 0%, rgba(56, 189, 248, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(168, 85, 247, 0.1) 0px, transparent 50%);
    color: var(--text-primary);
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Auth Pages */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex: 1;
    padding: 2rem;
}

.auth-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    border: var(--glass-border);
    padding: 2.5rem;
    border-radius: 1rem;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.brand-title {
    font-size: 1.875rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 2rem;
    background: linear-gradient(to right, #38bdf8, #818cf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.025em;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 0.5rem;
    color: white;
    font-size: 0.95rem;
    transition: all 0.2s;
    box-sizing: border-box;
}

input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.btn {
    display: block;
    width: 100%;
    padding: 0.75rem;
    background: var(--accent-color);
    color: #0f172a;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
    text-decoration: none;
    font-size: 0.95rem;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

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

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Dashboard */
.navbar {
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(8px);
    border-bottom: var(--glass-border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
}

.nav-brand {
    font-weight: 700;
    font-size: 1.25rem;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logout-btn {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    transition: all 0.2s;
}

.logout-btn:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
}

.main-content {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

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

.video-card {
    background: var(--card-bg);
    border: var(--glass-border);
    border-radius: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
    text-decoration: none;
    display: block;
    position: relative;
    group: hover;
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.2);
    border-color: rgba(56, 189, 248, 0.3);
}

.video-thumbnail {
    aspect-ratio: 16/9;
    background: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.video-thumbnail video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
}

.play-icon {
    position: absolute;
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.3s;
    transform: scale(0.8);
}

.video-card:hover .play-icon {
    opacity: 1;
    transform: scale(1);
}

.play-icon svg {
    width: 24px;
    height: 24px;
    fill: white;
    margin-left: 4px; /* Optical adjustment */
}

.video-info {
    padding: 1.25rem;
}

.video-title {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    margin: 0;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.video-meta {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Watch Page */
.player-container {
    max-width: 1000px;
    margin: 0 auto;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: 2rem;
    transition: color 0.2s;
}

.back-link:hover {
    color: var(--accent-color);
}

.video-player-wrapper {
    background: black;
    border-radius: 1rem;
    overflow: hidden;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    border: var(--glass-border);
}

video {
    width: 100%;
    display: block;
}

.now-playing-title {
    margin-top: 1.5rem;
    font-size: 1.5rem;
    font-weight: 700;
}

.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.alert-error {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

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

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}