/* ========== Reset & Base ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #4F46E5;
  --primary-light: #EEF2FF;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-400: #9CA3AF;
  --gray-500: #6B7280;
  --gray-600: #4B5563;
  --gray-700: #374151;
  --gray-800: #1F2937;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --radius: 8px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--gray-50);
  color: var(--gray-800);
  line-height: 1.6;
  min-height: 100vh;
}

/* ========== Login Page ========== */
#login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-box {
  background: #fff;
  border-radius: 16px;
  padding: 48px 40px;
  width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}

.login-box h1 {
  text-align: center;
  font-size: 24px;
  color: var(--gray-800);
  margin-bottom: 4px;
}

.login-box .subtitle {
  text-align: center;
  color: var(--gray-500);
  margin-bottom: 32px;
}

.login-box .hint {
  text-align: center;
  color: var(--gray-400);
  font-size: 13px;
  margin-top: 20px;
}

/* ========== Header ========== */
.header {
  background: #fff;
  border-bottom: 1px solid var(--gray-200);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header h1 {
  font-size: 18px;
  color: var(--gray-800);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-info {
  color: var(--gray-600);
  font-size: 14px;
}

/* ========== Main Layout ========== */
.main-container {
  display: flex;
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: 200px;
  background: #fff;
  border-right: 1px solid var(--gray-200);
  padding: 16px 0;
  flex-shrink: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  color: var(--gray-600);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}

.nav-item:hover {
  background: var(--gray-50);
  color: var(--primary);
}

.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 500;
}

.nav-icon {
  font-size: 16px;
}

.content {
  flex: 1;
  padding: 24px;
  overflow-y: auto;
}

/* ========== Form Elements ========== */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 14px;
  transition: border-color 0.2s;
  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 var(--primary-light);
}

/* ========== Buttons ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  background: #fff;
  color: var(--gray-700);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  white-space: nowrap;
}

.btn:hover {
  background: var(--gray-50);
  border-color: var(--gray-400);
}

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

.btn-primary:hover {
  background: #4338CA;
  border-color: #4338CA;
}

.btn-success {
  background: var(--success);
  color: #fff;
  border-color: var(--success);
}

.btn-success:hover {
  background: #059669;
}

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

.btn-danger:hover {
  background: #DC2626;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-block {
  width: 100%;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ========== Table ========== */
.table-container {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  background: var(--gray-50);
  padding: 12px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-200);
  white-space: nowrap;
}

td {
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

tr:hover td {
  background: var(--gray-50);
}

/* ========== Page Header ========== */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.page-header h2 {
  font-size: 20px;
  color: var(--gray-800);
}

/* ========== Search Bar ========== */
.search-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.search-bar .form-group {
  margin-bottom: 0;
  min-width: 150px;
}

.search-bar .form-group label {
  margin-bottom: 4px;
  font-size: 12px;
}

/* ========== Pagination ========== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 16px;
}

.pagination .btn {
  min-width: 36px;
  padding: 8px 12px;
}

.pagination .btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.pagination .page-info {
  color: var(--gray-500);
  font-size: 13px;
}

/* ========== Photo Groups ========== */
.photo-groups {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.photo-group h4 {
  font-size: 15px;
  color: var(--gray-700);
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--primary-light);
}

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

.photo-card {
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: all 0.2s;
  background: #fff;
}

.photo-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

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

.photo-card .photo-info {
  padding: 6px 10px;
  font-size: 12px;
  color: var(--gray-500);
}

/* ========== Modal ========== */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1000;
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.6);
}

.modal-content {
  position: relative;
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  max-width: 90vw;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-content.photo-viewer {
  padding: 12px;
  background: transparent;
  max-width: 95vw;
  max-height: 95vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.modal-content.photo-viewer img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 8px;
  object-fit: contain;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  background: rgba(0,0,0,0.5);
  color: #fff;
  font-size: 22px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.modal-close:hover {
  background: rgba(0,0,0,0.7);
}

.photo-nav {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 12px;
}

.photo-nav .btn {
  background: rgba(255,255,255,0.9);
  color: var(--gray-700);
}

#photo-counter {
  color: #fff;
  font-size: 14px;
}

/* ========== Detail Page ========== */
.detail-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.detail-info {
  background: #fff;
  border-radius: var(--radius);
  padding: 16px 20px;
  margin-bottom: 20px;
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  box-shadow: var(--shadow);
}

.detail-info .info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-info .info-label {
  font-size: 12px;
  color: var(--gray-400);
}

.detail-info .info-value {
  font-size: 14px;
  color: var(--gray-700);
  font-weight: 500;
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  padding: 12px 24px;
  border-radius: var(--radius);
  color: #fff;
  font-size: 14px;
  z-index: 2000;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
}

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.warning { background: var(--warning); }

/* ========== Empty State ========== */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--gray-400);
}

.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.empty-state p {
  font-size: 14px;
}

/* ========== Action Buttons in Table ========== */
.action-btns {
  display: flex;
  gap: 6px;
}

/* ========== Badge ========== */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.badge-active {
  background: #D1FAE5;
  color: #065F46;
}

.badge-disabled {
  background: #FEE2E2;
  color: #991B1B;
}

/* ========== Checkbox ========== */
.checkbox-cell {
  width: 40px;
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .sidebar {
    width: 60px;
  }
  .nav-item {
    padding: 12px 16px;
    justify-content: center;
  }
  .nav-item span:not(.nav-icon) {
    display: none;
  }
  .search-bar {
    flex-direction: column;
  }
  .search-bar .form-group {
    min-width: 100%;
  }
  .detail-info {
    flex-direction: column;
    gap: 12px;
  }
}