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

:root {
  --primary: #2c3e50;
  --accent: #e74c3c;
  --bg: #f5f5f5;
  --card-bg: #fff;
  --text: #333;
  --text-light: #777;
  --border: #ddd;
  --success: #27ae60;
  --danger: #e74c3c;
}

body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; }

.navbar { background: var(--primary); color: #fff; padding: 1rem 2rem; display: flex; justify-content: space-between; align-items: center; }
.nav-brand { color: #fff; text-decoration: none; font-size: 1.4rem; font-weight: bold; }
.nav-links a { color: #fff; text-decoration: none; margin-left: 1.5rem; opacity: 0.9; }
.nav-links a:hover { opacity: 1; }

.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }

.hero { text-align: center; padding: 2rem 0; }
.hero h1 { font-size: 2.5rem; color: var(--primary); margin-bottom: 0.5rem; }
.countdown-banner { background: var(--accent); color: #fff; padding: 1rem 2rem; border-radius: 8px; margin-top: 1rem; display: inline-block; }
.countdown-text { font-size: 1.2rem; font-weight: 600; }
.subtitle { color: var(--text-light); font-size: 1.1rem; }

.gallery { margin-top: 2rem; }
.gallery h2 { margin-bottom: 1.5rem; font-size: 1.8rem; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.card { background: var(--card-bg); border-radius: 12px; overflow: hidden; text-decoration: none; color: var(--text); box-shadow: 0 2px 8px rgba(0,0,0,0.1); transition: transform 0.2s, box-shadow 0.2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 6px 20px rgba(0,0,0,0.15); }
.card-img { width: 100%; height: 220px; overflow: hidden; background: #eee; }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 1rem; }
.card-body h3 { font-size: 1.1rem; margin-bottom: 0.3rem; }
.price { color: var(--accent); font-weight: bold; font-size: 1.2rem; }
.bid-count { color: var(--text-light); font-size: 0.9rem; }
.no-img { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--text-light); font-size: 0.9rem; }
.no-img.large { height: 300px; background: #eee; border-radius: 8px; }
.empty-msg { color: var(--text-light); text-align: center; padding: 3rem; }

/* Item detail */
.item-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; margin-bottom: 2rem; }
.item-gallery img { width: 100%; border-radius: 8px; margin-bottom: 0.5rem; }
.item-info h1 { margin-bottom: 0.5rem; }
.description { color: var(--text-light); margin-bottom: 1rem; }
.metadata { background: #f9f9f9; padding: 1rem; border-radius: 8px; margin-bottom: 1rem; }
.metadata p { margin-bottom: 0.3rem; }
.price-box { background: #fff3f3; padding: 1.5rem; border-radius: 8px; margin-bottom: 1rem; border: 2px solid var(--accent); }
.price-box h2 { color: var(--accent); }
.status-ended { color: var(--text-light); font-style: italic; margin-top: 1rem; }
.status-pending { color: var(--text-light); margin-top: 1rem; }

.bid-history { margin-top: 1.5rem; }
.bid-history h3 { margin-bottom: 0.5rem; }
.bid-history table { width: 100%; }

/* Buttons */
.btn { display: inline-block; padding: 0.6rem 1.2rem; border: none; border-radius: 6px; cursor: pointer; text-decoration: none; font-size: 0.95rem; transition: opacity 0.2s; }
.btn:hover { opacity: 0.85; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-secondary { background: var(--primary); color: #fff; }
.btn-danger { background: #c0392b; color: #fff; }
.btn-large { font-size: 1.1rem; padding: 0.8rem 2rem; }
.btn-sm { font-size: 0.85rem; padding: 0.3rem 0.8rem; }

/* Modals */
.modal-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.6); z-index: 1000; align-items: center; justify-content: center; }
.modal-overlay.active { display: flex; }
.modal { background: #fff; padding: 2rem; border-radius: 12px; max-width: 600px; width: 90%; max-height: 90vh; overflow-y: auto; position: relative; }
.modal-close { position: absolute; top: 0.5rem; right: 1rem; background: none; border: none; font-size: 1.8rem; cursor: pointer; color: var(--text-light); }
.modal h2 { margin-bottom: 1rem; color: var(--primary); }
.modal ol { margin: 1rem 0; padding-left: 1.5rem; }
.modal ol li { margin-bottom: 0.8rem; line-height: 1.5; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.3rem; font-weight: 600; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 0.6rem; border: 1px solid var(--border); border-radius: 6px; font-size: 0.95rem; }
.form-group textarea { resize: vertical; }
.form-group small { color: var(--text-light); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.error-msg { color: var(--danger); background: #fde8e8; padding: 0.8rem; border-radius: 6px; margin-bottom: 1rem; }

/* Auth */
.auth-box { max-width: 400px; margin: 4rem auto; background: var(--card-bg); padding: 2rem; border-radius: 12px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.auth-box h2 { margin-bottom: 1rem; text-align: center; }

/* Admin */
.admin-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; flex-wrap: wrap; gap: 1rem; }
.admin-section { margin-bottom: 2rem; }
.admin-section h2 { margin-bottom: 1rem; border-bottom: 2px solid var(--border); padding-bottom: 0.5rem; }
.settings-form { background: var(--card-bg); padding: 1.5rem; border-radius: 8px; }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; }
.stat-card { background: var(--card-bg); padding: 1.5rem; border-radius: 8px; text-align: center; box-shadow: 0 1px 4px rgba(0,0,0,0.08); }
.stat-card h3 { font-size: 2rem; color: var(--accent); }

.admin-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

.filter-tabs { display: flex; gap: 0; margin-bottom: 1.5rem; border-bottom: 2px solid var(--border); }
.tab { padding: 0.6rem 1.2rem; text-decoration: none; color: var(--text-light); border-bottom: 2px solid transparent; margin-bottom: -2px; }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

.table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; background: var(--card-bg); border-radius: 8px; overflow: hidden; }
.admin-table th, .admin-table td { padding: 0.8rem 1rem; text-align: left; border-bottom: 1px solid var(--border); }
.admin-table th { background: var(--primary); color: #fff; }
.admin-table tr:hover { background: #f9f9f9; }
.winning-bid { background: #eafaf1 !important; }

.badge { padding: 0.2rem 0.6rem; border-radius: 4px; font-size: 0.8rem; font-weight: 600; }
.badge-active { background: #d4edda; color: #155724; }
.badge-pending { background: #fff3cd; color: #856404; }
.badge-ended { background: #d6d8db; color: #383d41; }
.badge-cancelled { background: #f8d7da; color: #721c24; }

.admin-detail { margin-bottom: 2rem; }

.item-form { background: var(--card-bg); padding: 2rem; border-radius: 8px; }

table { border-collapse: collapse; }
table th, table td { padding: 0.5rem 0.8rem; text-align: left; border-bottom: 1px solid var(--border); }

.footer { text-align: center; padding: 2rem; color: var(--text-light); margin-top: 2rem; border-top: 1px solid var(--border); }

@media (max-width: 768px) {
  .item-detail { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .navbar { flex-direction: column; gap: 0.5rem; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
}