:root {
    --bg: #0f0f0f;
    --surface: #1a1a1a;
    --surface2: #242424;
    --border: #333;
    --text: #e5e5e5;
    --text2: #999;
    --primary: #6366f1;
    --primary-hover: #5558e6;
    --danger: #ef4444;
    --success: #22c55e;
    --radius: 12px;
}

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

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

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 20px 0;
    margin-bottom: 40px;
}
.site-header h1 { font-size: 1.5rem; font-weight: 700; }
.site-header p { color: var(--text2); margin-top: 4px; font-size: 0.9rem; }

.thumb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
    padding-bottom: 40px;
}

.thumb-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: transform 0.2s, border-color 0.2s;
    display: block;
    color: var(--text);
    text-decoration: none;
}
.thumb-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    text-decoration: none;
}

.thumb-image {
    width: 100%;
    height: 120px;
    background: var(--surface2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text2);
    font-size: 0.85rem;
    overflow: hidden;
}
.thumb-image img { width: 100%; height: 100%; object-fit: cover; }

.thumb-body { padding: 10px 12px; }
.thumb-body h3 { font-size: 0.85rem; margin-bottom: 4px; color: var(--text); }
.thumb-body p { color: var(--text2); font-size: 0.85rem; margin-bottom: 10px; }
.thumb-body .url { font-size: 0.8rem; color: var(--primary); word-break: break-all; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text2); }

.admin-login { max-width: 400px; margin: 100px auto; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 40px; }
.admin-login h2 { margin-bottom: 24px; text-align: center; }
.admin-login input { width: 100%; padding: 12px 16px; background: var(--surface2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 1rem; margin-bottom: 16px; }
.admin-login input:focus { outline: none; border-color: var(--primary); }
.admin-login button { width: 100%; padding: 12px; background: var(--primary); color: white; border: none; border-radius: 8px; font-size: 1rem; cursor: pointer; font-weight: 600; }
.admin-login button:hover { background: var(--primary-hover); }

.admin-nav { background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px 0; margin-bottom: 30px; position: sticky; top: 0; z-index: 10; }
.admin-nav .container { display: flex; align-items: center; justify-content: space-between; }
.admin-nav h2 { font-size: 1.1rem; }
.admin-nav .nav-links { display: flex; gap: 20px; flex-wrap: wrap; }
.admin-nav .nav-links a { color: var(--text); font-size: 0.9rem; padding: 6px 12px; border-radius: 6px; }
.admin-nav .nav-links a:hover { background: var(--surface2); text-decoration: none; }
.admin-nav .nav-links a.active { background: var(--primary); color: white; }

.admin-content { padding: 0 0 40px; }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; margin-bottom: 20px; }
.card h3 { margin-bottom: 16px; font-size: 1.1rem; }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 0.9rem; color: var(--text2); }
.form-group input, .form-group textarea, .form-group select {
    width: 100%; padding: 10px 14px; background: var(--surface2);
    border: 1px solid var(--border); border-radius: 8px; color: var(--text);
    font-size: 0.95rem; font-family: inherit;
}
.form-group textarea { min-height: 80px; resize: vertical; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }
.form-group input[type="checkbox"] { width: auto; margin-right: 8px; }

.btn { display: inline-block; padding: 10px 20px; border: none; border-radius: 8px; font-size: 0.9rem; cursor: pointer; font-weight: 600; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { opacity: 0.9; }
.btn-sm { padding: 6px 12px; font-size: 0.8rem; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--surface2); }

table { width: 100%; border-collapse: collapse; }
table th, table td { text-align: left; padding: 12px; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
table th { color: var(--text2); font-weight: 600; }
table tr:hover td { background: var(--surface2); }

.thumb-preview { width: 120px; height: 68px; object-fit: cover; border-radius: 6px; background: var(--surface2); }

.alert { padding: 14px 18px; border-radius: 8px; margin-bottom: 20px; font-size: 0.9rem; }
.alert-success { background: #064e3b; border: 1px solid #065f46; color: #6ee7b7; }
.alert-error { background: #7f1d1d; border: 1px solid #991b1b; color: #fca5a5; }

@media (max-width: 640px) {
    .thumb-grid { grid-template-columns: 1fr; }
    .admin-nav .container { flex-direction: column; gap: 10px; }
}
.category-filter {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}

.filter-btn {
    display: inline-block;
    padding: 8px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 20px;
    color: var(--text2);
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s;
    text-decoration: none;
}
.filter-btn:hover {
    background: var(--surface2);
    color: var(--text);
    border-color: var(--primary);
    text-decoration: none;
}
.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.cat-tag {
    display: inline-block;
    padding: 1px 6px;
    font-size: 0.65rem;
    background: var(--primary);
    color: #fff;
    border-radius: 10px;
    font-size: 0.7rem;
    font-weight: 600;
    margin-top: 6px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text2);
    font-size: 1.1rem;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}
.site-logo {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    object-fit: contain;
}