/* =============================================
   ADMIN.CSS — 管理后台布局与组件
   ============================================= */

/* ─── Layout ─── */
.admin-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 64px - 80px);
  background: var(--bg);
}

.admin-sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}

.admin-nav { display: flex; flex-direction: column; gap: 4px; padding: 0 12px; }
.admin-nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; border-radius: var(--radius-sm);
  background: transparent; border: none; cursor: pointer;
  font-family: var(--font-body); font-size: .9rem;
  color: var(--text-mid); text-align: left; width: 100%;
  transition: all var(--dur) var(--ease);
}
.admin-nav-item:hover  { background: var(--bg); color: var(--text); }
.admin-nav-item.active { background: var(--teal-light); color: var(--teal-dark); font-weight: 600; }

.admin-main {
  padding: 32px; min-width: 0; overflow-x: auto;
}

/* ─── Page header ─── */
.admin-page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}
.admin-page-title {
  font-family: var(--font-serif); font-size: 1.4rem;
  color: var(--text); font-weight: 700;
}

/* ─── Dashboard ─── */
.dashboard-stats {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px; margin-bottom: 32px;
}
.stat-card {
  background: var(--surface); border-radius: var(--radius-md);
  border: 1px solid var(--border); padding: 20px 24px;
  box-shadow: var(--shadow-sm); text-align: center;
}
.stat-card.accent { border-color: var(--teal); background: var(--teal-light); }
.stat-card.muted  { background: var(--bg); }
.stat-num   { font-family: var(--font-display); font-size: 2.2rem; color: var(--text); line-height: 1; }
.stat-label { font-size: .78rem; color: var(--text-muted); margin-top: 6px; }
.stat-card.accent .stat-num { color: var(--teal-dark); }

.dashboard-quick { background: var(--surface); border-radius: var(--radius-md); border: 1px solid var(--border); padding: 24px; }
.dashboard-quick-title { font-size: .95rem; font-weight: 600; color: var(--text-mid); margin-bottom: 16px; }
.dashboard-quick-btns { display: flex; gap: 12px; flex-wrap: wrap; }

/* ─── Filters ─── */
.admin-filters { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }

/* ─── Table ─── */
.admin-table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--border); }
.admin-table { width: 100%; border-collapse: collapse; background: var(--surface); font-size: .88rem; }
.admin-table thead tr { background: var(--bg); }
.admin-table th { padding: 12px 16px; text-align: left; font-size: .75rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--text-muted); border-bottom: 1px solid var(--border); white-space: nowrap; }
.admin-table td { padding: 12px 16px; border-bottom: 1px solid var(--border); vertical-align: middle; color: var(--text); }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--bg); }
.table-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.table-thumb { width: 48px; height: 36px; object-fit: cover; border-radius: 4px; border: 1px solid var(--border); }
.empty-row { text-align: center; color: var(--text-muted); padding: 40px !important; }

/* ─── Upload zone ─── */
.upload-zone { background: var(--surface); border-radius: var(--radius-md); border: 2px dashed var(--border); padding: 24px; margin-bottom: 28px; }
.upload-title { font-weight: 600; color: var(--text); margin-bottom: 14px; font-size: .95rem; }
.upload-form  { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.upload-result { margin-top: 12px; font-size: .85rem; color: var(--text-mid); }
.upload-result code { background: var(--bg); padding: 2px 6px; border-radius: 4px; word-break: break-all; }

/* ─── Media grid ─── */
.media-section { margin-bottom: 32px; }
.media-section-title { font-size: .95rem; font-weight: 700; color: var(--text-mid); margin-bottom: 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.media-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.media-card { background: var(--surface); border-radius: var(--radius-md); border: 1px solid var(--border); overflow: hidden; }
.media-thumb { width: 100%; height: 130px; object-fit: cover; display: block; border-bottom: 1px solid var(--border); }
.media-card-info { padding: 8px 10px 4px; }
.media-card-name { font-size: .78rem; font-weight: 500; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.media-card-path { font-size: .7rem; color: var(--text-muted); display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; word-break: break-all; }
.media-card-actions { display: flex; gap: 6px; padding: 8px 10px; flex-wrap: wrap; }

.media-list { display: flex; flex-direction: column; gap: 10px; }
.pdf-row { background: var(--surface); border-radius: var(--radius-md); border: 1px solid var(--border); padding: 12px 16px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.pdf-row-info { display: flex; align-items: center; gap: 12px; min-width: 0; flex: 1; }
.pdf-icon { font-size: 1.4rem; flex-shrink: 0; }
.pdf-row-name { font-size: .88rem; font-weight: 500; color: var(--text); }

/* ─── Error ─── */
.admin-error { color: var(--red); padding: 20px; font-size: .9rem; }

@media (max-width: 900px) {
  .admin-layout { grid-template-columns: 1fr; }
  .admin-sidebar { position: static; height: auto; border-right: none; border-bottom: 1px solid var(--border); padding: 12px 0; }
  .admin-nav { flex-direction: row; flex-wrap: wrap; padding: 0 16px; }
  .admin-nav-item { width: auto; padding: 8px 12px; font-size: .82rem; }
  .admin-main { padding: 20px 16px; }
  .dashboard-stats { grid-template-columns: 1fr 1fr; }
}