/* ==========================================================================
   Modern Minimalist Admin Dashboard CSS
   ========================================================================== */

:root {
  --admin-bg: #f8fafc;
  --admin-card: #ffffff;
  --admin-sidebar: #0f172a;
  --admin-sidebar-hover: #1e293b;
  --admin-sidebar-text: #94a3b8;
  --admin-sidebar-active: #38bdf8;
  
  --admin-text: #1e293b;
  --admin-text-muted: #64748b;
  --admin-border: #e2e8f0;
  --admin-primary: #2563eb;
  --admin-primary-hover: #1d4ed8;
  --admin-danger: #ef4444;
  --admin-danger-hover: #dc2626;
  --admin-success: #10b981;
  --admin-warning: #f59e0b;

  --radius: 8px;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--admin-bg);
  color: var(--admin-text);
  font-size: 14px;
  line-height: 1.5;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Layout */
.admin-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar - Fixed independently on the left */
.admin-sidebar {
  width: 240px;
  height: 100vh;
  position: sticky;
  top: 0;
  background-color: var(--admin-sidebar);
  color: #fff;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
  z-index: 100;
}

/* Custom Slim Scrollbars for Admin */
.admin-sidebar::-webkit-scrollbar,
.admin-main::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
.admin-sidebar::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}
.admin-sidebar::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.3);
}
.admin-main::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 3px;
}
.admin-main::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

.admin-brand {
  height: 60px;
  padding: 0 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

.admin-nav {
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex: 1;
}

.admin-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius);
  color: var(--admin-sidebar-text);
  font-weight: 500;
  transition: all 0.2s;
}

.admin-nav a:hover {
  background-color: var(--admin-sidebar-hover);
  color: #fff;
}

.admin-nav a.active {
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--admin-sidebar-active);
  font-weight: 600;
}

.admin-sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--admin-sidebar-text);
  flex-shrink: 0;
}

/* Main Area - Independent Scroll */
.admin-main {
  flex: 1;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  min-width: 0;
  -webkit-overflow-scrolling: touch;
}

.admin-topbar {
  height: 60px;
  background-color: #fff;
  border-bottom: 1px solid var(--admin-border);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
  flex-shrink: 0;
}

.admin-content {
  padding: 28px;
  flex: 1;
}

/* Common UI Components */
.page-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.page-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--admin-text);
  margin: 0;
}

.page-subtitle {
  font-size: 0.88rem;
  color: var(--admin-text-muted);
  margin-top: 4px;
}

.card {
  background-color: var(--admin-card);
  border-radius: var(--radius);
  border: 1px solid var(--admin-border);
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.04), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
  padding: 20px 24px;
  margin-bottom: 24px;
}

.card-flush {
  padding: 0;
  overflow: hidden;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--admin-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.card-body {
  padding: 20px 24px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--admin-text);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-desc {
  font-size: 0.85rem;
  color: var(--admin-text-muted);
  margin: 4px 0 0 0;
}

/* Stats Cards */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
  margin-bottom: 24px;
}

.stat-card {
  background-color: #fff;
  border-radius: var(--radius);
  border: 1px solid var(--admin-border);
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.04);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.stat-val {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--admin-text);
  margin-top: 4px;
}

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

.stat-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background-color: #eff6ff;
  color: var(--admin-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ==========================================================================
   3-Tier Admin Button Hierarchy:
   1. Tier 1: 卡片外全局主按钮 (最大) -> .btn-lg, .page-title-row .btn (Height: 40px)
   2. Tier 2: 卡片上操作按钮 (中等) -> .btn, .btn-md (Height: 34px)
   3. Tier 3: 表单行/表格行内按钮 (更小) -> .btn-sm, .table td .btn, .form-inline-btn (Height: 28px)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 34px;
  padding: 0 14px;
  border-radius: 6px;
  font-size: 0.84rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  box-sizing: border-box;
  white-space: nowrap;
  line-height: 1;
  text-decoration: none;
  transition: all 0.15s ease;
  vertical-align: middle;
}

/* Tier 1: 卡片外页面级按钮 (最大) */
.btn-lg,
.page-title-row .btn {
  height: 40px !important;
  padding: 0 20px !important;
  font-size: 0.92rem !important;
  font-weight: 600 !important;
  border-radius: 8px !important;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

/* Tier 2: 卡片上操作按钮 (中等 - 默认已在 .btn 中设置 height: 34px) */
.btn-md {
  height: 34px !important;
  padding: 0 14px !important;
  font-size: 0.84rem !important;
}

/* Tier 3: 表单行上 / 表格行内按钮 (更小) */
.btn-sm,
.table td .btn,
.form-inline-btn {
  height: 28px !important;
  padding: 0 8px !important;
  font-size: 0.78rem !important;
  font-weight: 500 !important;
  border-radius: 4px !important;
  gap: 4px !important;
}

.table td .btn {
  height: 26px !important;
  padding: 0 7px !important;
  font-size: 0.76rem !important;
}

/* Button Variants */
.btn-primary {
  background-color: var(--admin-primary);
  color: #fff !important;
  border-color: var(--admin-primary);
}
.btn-primary:hover {
  background-color: var(--admin-primary-hover);
  border-color: var(--admin-primary-hover);
}

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

.btn-outline {
  background-color: #fff;
  border-color: var(--admin-border);
  color: var(--admin-text) !important;
}
.btn-outline:hover {
  background-color: #f8fafc;
  border-color: #cbd5e1;
}

.btn-outline-danger {
  background-color: transparent;
  border-color: #fca5a5;
  color: #ef4444 !important;
}
.btn-outline-danger:hover {
  background-color: #fef2f2;
  border-color: #ef4444;
}

/* Forms & Tables */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--admin-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  outline: none;
  background-color: #fff;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--admin-primary);
  box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
  font-family: inherit;
}

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th, .data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--admin-border);
  font-size: 0.88rem;
  text-align: left;
  vertical-align: middle;
}

.data-table td:last-child, .data-table th:last-child {
  white-space: nowrap !important;
}

.action-btn-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  flex-wrap: nowrap;
}

.data-table th {
  background-color: #f8fafc;
  font-weight: 600;
  color: var(--admin-text-muted);
  font-size: 0.82rem;
  text-align: left;
}

.data-table tr:hover td {
  background-color: #f8fafc;
}

/* Nav Table & Setting Form Tables (Spacious & Clean Row Heights) */
.nav-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  text-align: left;
}

.nav-table th {
  background-color: #f8fafc;
  font-weight: 600;
  color: var(--admin-text-muted);
  font-size: 0.82rem;
  padding: 14px 16px;
  border-bottom: 1px solid var(--admin-border);
  letter-spacing: 0.3px;
}

.nav-table td {
  padding: 12px 16px;
  border-bottom: 1px solid #f1f5f9;
  vertical-align: middle;
  font-size: 0.88rem;
}

.nav-table tbody tr {
  transition: background-color 0.15s ease;
}

.nav-table tbody tr:hover td {
  background-color: #fbfcfe;
}

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

.nav-table .form-input,
.nav-table .form-select {
  height: 36px !important;
  padding: 0 12px !important;
  font-size: 0.86rem !important;
  border-radius: 6px !important;
  background-color: #fff;
  border: 1px solid #cbd5e1;
  box-sizing: border-box;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.nav-table .form-input:focus,
.nav-table .form-select:focus {
  border-color: var(--admin-primary) !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12) !important;
}

/* Media Specific Styling */
.media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.media-item {
  border: 1px solid var(--admin-border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  position: relative;
  transition: all 0.2s;
}

.media-item:hover {
  box-shadow: var(--shadow);
  border-color: var(--admin-primary);
}

.media-thumb {
  height: 120px;
  background-color: #f1f5f9;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.media-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-info {
  padding: 10px;
  font-size: 0.8rem;
}

.media-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 4px;
}

.badge-orphan {
  background-color: rgba(239, 68, 68, 0.1);
  color: #dc2626;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.badge-used {
  background-color: rgba(16, 185, 129, 0.1);
  color: #059669;
  font-size: 0.72rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}