:root {
    --primary-color: #7c4dff;
    --secondary-color: #ff4081;
    --bg-dark: #0f0f0f;
    --bg-card: #1e1e1e;
    --text-main: #f1f1f1;
    --text-muted: #aaaaaa;
    --accent: #ffd740;
    --glass: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
}

/* Header & Navigation */
header {
    height: 64px;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--glass-border);
    justify-content: space-between;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.search-bar {
    flex: 0 1 600px;
    display: flex;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 40px;
    padding: 4px 16px;
    margin: 0 20px;
}

.search-bar input {
    background: transparent;
    border: none;
    color: white;
    width: 100%;
    padding: 8px;
    font-size: 1rem;
}

.search-bar input:focus {
    outline: none;
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    padding: 24px;
}

.video-card {
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--glass-border);
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.video-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #333;
    background-size: cover;
    background-position: center;
    position: relative;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.8);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.video-info {
    padding: 16px;
}

.video-title {
    font-weight: 600;
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    padding: 10px 24px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

/* Forms */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    background: var(--glass);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: white;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    background: rgba(255,255,255,0.08);
}

/* Wizard / Auth Layout */
.centered-container {
    max-width: 500px;
    margin: 80px auto;
    background: var(--bg-card);
    padding: 40px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

.wizard-step {
    display: none;
}

.wizard-step.active {
    display: block;
    animation: fadeIn 0.4s ease;
}

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