:root {
    --primary: #00a86b;
    --primary-dark: #008f5a;
    --danger: #e53e3e;
    --danger-dark: #c53030;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --text: #2d3748;
    --text-light: #718096;
    --border: #e2e8f0;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navbar */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    gap: 1rem;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--primary);
    text-decoration: none;
    white-space: nowrap;
}

.navbar-links {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.navbar-links a {
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
}

.navbar-links a:hover {
    color: var(--primary);
}

.navbar-user {
    color: var(--text-light);
    font-size: 0.85rem;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
    flex: 1;
    width: 100%;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    background: var(--card-bg);
    color: var(--text);
    transition: all 0.15s;
    line-height: 1.4;
}

.btn:hover {
    background: var(--bg);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
}

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

.btn-danger:hover {
    background: var(--danger-dark);
}

.btn-outline {
    background: transparent;
    color: var(--text);
}

.btn-sm {
    padding: 0.25rem 0.6rem;
    font-size: 0.8rem;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.alert-error {
    background: #fff5f5;
    color: var(--danger);
    border: 1px solid #fed7d7;
}

.alert-success {
    background: #f0fff4;
    color: #276749;
    border: 1px solid #c6f6d5;
}

/* Login */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
}

.login-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
}

.login-card h1 {
    margin-bottom: 0.25rem;
}

.login-subtitle {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
    color: var(--text);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 168, 107, 0.15);
}

.form-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    max-width: 600px;
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* Cards grid */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text);
    transition: box-shadow 0.15s, transform 0.15s;
    border: 1px solid var(--border);
}

.card-thumb {
    width: 100%;
    height: 160px;
    object-fit: cover;
    display: block;
}

.card-thumb + .card-title,
.card-icon + .card-title {
    padding-top: 0;
}

.card-body {
    padding: 1rem 1.25rem 1.25rem;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.card-icon {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 0.75rem;
}

.card-title {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.card-desc {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.card-meta {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* Video grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.25rem;
}

.video-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
    text-decoration: none;
    color: var(--text);
    transition: box-shadow 0.15s, transform 0.15s;
}

.video-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.video-card:hover .video-card-overlay {
    opacity: 1;
}

.video-card-thumb {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #1a202c;
    overflow: hidden;
}

.video-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.video-card-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: #4a5568;
}

.video-card-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: #fff;
    opacity: 0;
    transition: opacity 0.2s;
}

.video-card-info {
    padding: 0.75rem 1rem;
}

.video-card-title {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.video-card-meta {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Player */
.player-wrapper {
    background: #000;
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
}

.video-player {
    width: 100%;
    max-height: 70vh;
    display: block;
}

.video-details {
    background: var(--card-bg);
    padding: 1.25rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 1rem;
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb a:hover {
    text-decoration: underline;
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table th,
.table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 0.9rem;
}

.table th {
    background: var(--bg);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-light);
}

.table tr:last-child td {
    border-bottom: none;
}

.table a {
    color: var(--primary);
    text-decoration: none;
}

.table a:hover {
    text-decoration: underline;
}

.actions {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.inline-form {
    display: inline;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
}

/* Admin header */
.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    gap: 1rem;
    flex-wrap: wrap;
}

.admin-nav {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-admin {
    background: #e6fffa;
    color: #234e52;
}

.badge-viewer {
    background: #ebf8ff;
    color: #2a4365;
}

/* Upload zone */
.upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    text-align: center;
    margin-bottom: 2rem;
    transition: border-color 0.2s, background 0.2s;
}

.upload-zone.dragover {
    border-color: var(--primary);
    background: rgba(0, 168, 107, 0.05);
}

.upload-zone-text {
    color: var(--text-light);
    margin-bottom: 0.75rem;
}

.upload-progress {
    margin-top: 1.5rem;
}

.upload-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
}

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

.upload-item-name {
    flex: 1;
    font-size: 0.9rem;
    text-align: left;
}

.upload-item-status {
    font-size: 0.8rem;
    color: var(--text-light);
    min-width: 80px;
    text-align: right;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
    min-width: 100px;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.2s;
}

/* Empty state */
.empty-state {
    text-align: center;
    color: var(--text-light);
    padding: 3rem 1rem;
    font-size: 1.1rem;
}

/* Error page */
.error-page {
    text-align: center;
    padding: 4rem 1rem;
}

.error-page h1 {
    font-size: 4rem;
    color: var(--text-light);
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-light);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-inner {
        flex-direction: column;
        height: auto;
        padding: 0.75rem 0;
        gap: 0.5rem;
    }

    .navbar-links {
        gap: 0.5rem;
        justify-content: center;
    }

    .container {
        padding: 1rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .table {
        display: block;
        overflow-x: auto;
    }

    .admin-header {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .form-card {
        padding: 1.25rem;
    }

    h1 {
        font-size: 1.5rem;
    }
}