/* 后台 - 清新简洁，与前台风格一致 */
:root {
  --primary: #0D9488;
  --primary-hover: #0F766E;
  --text: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
  --bg: #F8FAFC;
  --card-bg: #FFFFFF;
  --danger: #DC2626;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
}

.admin-header {
  background: linear-gradient(135deg, #0D9488 0%, #0F766E 100%);
  color: #fff;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 8px rgba(13, 148, 136, 0.2);
}
.admin-header .logo { color: #fff; text-decoration: none; font-weight: 600; font-size: 1.1rem; padding: 16px 0; }
.admin-header .nav { display: flex; align-items: center; gap: 8px; }
.admin-header .nav a { color: rgba(255,255,255,0.9); text-decoration: none; padding: 12px 16px; border-radius: 8px; transition: background 0.2s; }
.admin-header .nav a:hover { background: rgba(255,255,255,0.15); color: #fff; }
.admin-header .nav .user { color: rgba(255,255,255,0.85); margin-right: 8px; font-size: 0.9rem; }

.admin-main { max-width: 1000px; margin: 0 auto; padding: 24px 16px 48px; }
.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.alert-success { background: #D1FAE5; color: #065F46; }
.alert-danger { background: #FEE2E2; color: #991B1B; }

.card { background: var(--card-bg); border-radius: 12px; box-shadow: 0 2px 12px rgba(13, 148, 136, 0.06); padding: 24px; margin-bottom: 24px; }
.card h2 { margin: 0 0 16px; font-size: 1.25rem; }
.toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.toolbar h2 { margin: 0; }
.muted { color: var(--text-muted); font-size: 0.9rem; margin: 0 0 16px; }
.stats { display: flex; gap: 32px; margin: 16px 0; }
.stat-num { font-size: 1.75rem; font-weight: 600; color: var(--primary); display: block; }
.stat-label { font-size: 0.9rem; color: var(--text-muted); }

.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { font-weight: 600; color: var(--text-muted); font-size: 0.85rem; }
.table td a { margin-right: 12px; color: var(--primary); text-decoration: none; }
.table td a:hover { text-decoration: underline; }
.table td a.danger { color: var(--danger); }
.empty-inline { color: var(--text-muted); padding: 16px 0; }

.form { max-width: 560px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: var(--text); }
.form-group input[type="text"], .form-group input[type="url"], .form-group input[type="number"], .form-group select {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; 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 rgba(13, 148, 136, 0.15);
}
.textarea { width: 100%; min-height: 320px; padding: 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; font-family: inherit; resize: vertical; }
.form-row { display: flex; gap: 16px; }
.form-row .form-group { flex: 1; }
.form-actions { margin-top: 24px; display: flex; gap: 12px; align-items: center; }
.cover-upload { margin-top: 8px; }
.cover-preview { margin-bottom: 12px; min-height: 40px; }
.cover-preview img { max-width: 320px; max-height: 180px; object-fit: contain; border-radius: 8px; border: 1px solid var(--border); }
.cover-actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.cover-actions input[type="file"] { display: none; }
.cover-hint { font-size: 0.85rem; color: var(--text-muted); }

.btn {
  display: inline-block; padding: 10px 20px; border-radius: 8px; font-size: 14px; font-weight: 500; text-decoration: none;
  border: 1px solid var(--border); background: #fff; color: var(--text); cursor: pointer; font-family: inherit; transition: all 0.2s;
}
.btn:hover { background: var(--bg); border-color: #cbd5e1; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); border-color: var(--primary-hover); color: #fff; }
.btn-block { display: block; width: 100%; text-align: center; }

.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(180deg, #F0FDFA 0%, #F8FAFC 100%); }
.auth-box { width: 100%; max-width: 400px; background: var(--card-bg); padding: 40px; border-radius: 16px; box-shadow: 0 4px 24px rgba(13, 148, 136, 0.1); }
.auth-box h1 { margin: 0 0 8px; font-size: 1.5rem; }
.auth-box .muted { margin-bottom: 24px; }
.auth-box .form-group { margin-bottom: 16px; }
.auth-box .btn { margin-top: 8px; }