:root {
  --bg-dark: #0f172a;
  --card-bg: #1e293b;
  --accent: #d97706;
  --accent-hover: #b45309;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: #334155;
  --success: #166534;
  --danger: #991b1b;
  --grade-badge: #0284c7;
}

* { 
  box-sizing: border-box; 
  margin: 0; 
  padding: 0; 
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
}

body { 
  background-color: var(--bg-dark); 
  color: var(--text-main); 
  min-height: 100vh; 
  padding-bottom: 50px; 
}

/* Header & Navigation */
header { 
  background: #020617; 
  border-bottom: 1px solid var(--border); 
  padding: 1rem 2rem; 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  position: sticky; 
  top: 0; 
  z-index: 100; 
}

.logo { 
  font-size: 1.5rem; 
  font-weight: 800; 
  color: var(--accent); 
  letter-spacing: 1px; 
}

nav button { 
  background: transparent; 
  border: none; 
  color: var(--text-muted); 
  font-size: 1rem; 
  margin: 0 10px; 
  cursor: pointer; 
  transition: 0.2s; 
  position: relative; 
}

nav button.active, nav button:hover { 
  color: var(--accent); 
  font-weight: bold; 
}

.nav-badge { 
  background: #ef4444; 
  color: white; 
  font-size: 0.7rem; 
  font-weight: bold; 
  border-radius: 10px; 
  padding: 2px 6px; 
  position: absolute; 
  top: -6px; 
  right: -12px; 
}

.auth-btn { 
  background: var(--accent); 
  color: white; 
  padding: 8px 16px; 
  border-radius: 6px; 
  border: none; 
  cursor: pointer; 
  font-weight: 600; 
}

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

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

/* Modal / Auth Card */
.modal { 
  display: none; 
  position: fixed; 
  top: 0; 
  left: 0; 
  width: 100%; 
  height: 100%; 
  background: rgba(0,0,0,0.8); 
  z-index: 200; 
  justify-content: center; 
  align-items: center; 
}

.modal-content { 
  background: var(--card-bg); 
  padding: 2rem; 
  border-radius: 12px; 
  width: 100%; 
  max-width: 520px; 
  border: 1px solid var(--border); 
  max-height: 90vh; 
  overflow-y: auto; 
}

.modal-content h2 { 
  margin-bottom: 1rem; 
  color: var(--accent); 
}

.input-group { 
  margin-bottom: 1rem; 
}

.input-group label { 
  display: block; 
  margin-bottom: 5px; 
  font-size: 0.85rem; 
  color: var(--text-muted); 
}

.input-group input, .input-group select, .input-group textarea { 
  width: 100%; 
  padding: 10px; 
  background: #0f172a; 
  border: 1px solid var(--border); 
  color: white; 
  border-radius: 6px; 
}

.form-row { 
  display: flex; 
  gap: 10px; 
}

.form-row .input-group { 
  flex: 1; 
}

/* Categories Filter */
.categories { 
  display: flex; 
  gap: 10px; 
  flex-wrap: wrap; 
  margin-bottom: 2rem; 
}

.cat-chip { 
  background: var(--card-bg); 
  border: 1px solid var(--border); 
  padding: 8px 16px; 
  border-radius: 20px; 
  cursor: pointer; 
  color: var(--text-muted); 
}

.cat-chip.active { 
  background: var(--accent); 
  color: white; 
  border-color: var(--accent); 
}

/* Card Grid */
.grid { 
  display: grid; 
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); 
  gap: 1.5rem; 
}

.card-item { 
  background: var(--card-bg); 
  border-radius: 10px; 
  overflow: hidden; 
  border: 1px solid var(--border); 
  transition: transform 0.2s; 
  position: relative; 
}

.card-item:hover { 
  transform: translateY(-5px); 
}

.card-img { 
  width: 100%; 
  height: 280px; 
  object-fit: cover; 
  background: #0f172a; 
}

.card-body { 
  padding: 1rem; 
}

.card-title { 
  font-size: 1.05rem; 
  font-weight: bold; 
  margin-bottom: 6px; 
  line-height: 1.3; 
}

.badge-wrap { 
  display: flex; 
  gap: 6px; 
  flex-wrap: wrap; 
  margin-bottom: 8px; 
}

.card-tag { 
  font-size: 0.75rem; 
  background: #334155; 
  color: var(--accent); 
  padding: 2px 8px; 
  border-radius: 4px; 
  display: inline-block; 
}

.grade-tag { 
  font-size: 0.75rem; 
  background: var(--grade-badge); 
  color: white; 
  padding: 2px 8px; 
  border-radius: 4px; 
  font-weight: bold; 
}

.cond-tag { 
  font-size: 0.75rem; 
  background: #475569; 
  color: #f1f5f9; 
  padding: 2px 8px; 
  border-radius: 4px; 
}

.card-meta { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  margin-top: 10px; 
  font-size: 0.85rem; 
}

.card-owner { 
  color: var(--text-muted); 
}

.card-price { 
  font-weight: bold; 
  color: #4ade80; 
  font-size: 1.1rem; 
}

/* Google Image Matcher Grid */
.image-results { 
  display: grid; 
  grid-template-columns: repeat(5, 1fr); 
  gap: 10px; 
  margin-top: 10px; 
}

.match-option { 
  border: 2px solid transparent; 
  border-radius: 6px; 
  overflow: hidden; 
  cursor: pointer; 
}

.match-option.selected { 
  border-color: var(--accent); 
}

.match-option img { 
  width: 100%; 
  height: 80px; 
  object-fit: cover; 
  display: block; 
}

/* BST Badge */
.bst-status { 
  font-size: 0.75rem; 
  font-weight: bold; 
  padding: 2px 6px; 
  border-radius: 4px; 
  margin-left: 6px; 
}

.status-review { 
  background: #854d0e; 
  color: #fef08a; 
}

.status-active { 
  background: #166534; 
  color: #bbf7d0; 
}

/* Admin Action Buttons */
.admin-controls { 
  display: flex; 
  gap: 8px; 
  margin-top: 12px; 
}

.btn-approve { 
  background: var(--success); 
  color: white; 
  border: none; 
  padding: 8px; 
  border-radius: 6px; 
  width: 50%; 
  cursor: pointer; 
  font-weight: bold; 
}

.btn-reject { 
  background: var(--danger); 
  color: white; 
  border: none; 
  padding: 8px; 
  border-radius: 6px; 
  width: 50%; 
  cursor: pointer; 
  font-weight: bold; 
}

.btn-approve:hover { 
  background: #15803d; 
}

.btn-reject:hover { 
  background: #b91c1c; 
}