:root {
  /* layers */
  --bg: #070b10;
  --bg-elevated: #0a1016;
  --sidebar: #0c141c;
  --card: rgba(16, 26, 36, 0.93);
  --surface: #091018;

  /* borders / text */
  --border: rgba(56, 189, 248, 0.18);
  --border-strong: rgba(56, 189, 248, 0.4);
  --text: #e8f1f8;
  --muted: #7a93a8;

  /* accent — popadmin cyan */
  --accent: #38bdf8;
  --accent2: #22d3ee;
  --accent-soft: rgba(56, 189, 248, 0.09);
  --accent-glow: rgba(56, 189, 248, 0.16);
  --on-accent: #041018;

  /* semantic */
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;

  /* shape / depth / space */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 4px 18px rgba(0, 0, 0, 0.28);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 36px var(--accent-glow);
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;

  --gradient-accent: linear-gradient(135deg, #0ea5e9, var(--accent2));
  --gradient-page:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(56,189,248,0.15), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 0%, rgba(34,211,238,0.09), transparent 50%),
    var(--bg);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "IBM Plex Sans", "Segoe UI", "PingFang SC", sans-serif;
  background: var(--gradient-page);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.45;
}
.hidden { display: none !important; }

.login-page {
  min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px;
}
.login-card {
  width: 380px; max-width: 100%; padding: 40px; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow), var(--shadow-glow);
  backdrop-filter: blur(10px);
}
.login-card h1 {
  font-size: 24px; font-weight: 700; letter-spacing: -0.02em;
  background: linear-gradient(110deg, var(--accent), #a5f3fc);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.login-sub { color: var(--muted); font-size: 13px; margin: 8px 0 24px; line-height: 1.45; }
.login-card input {
  width: 100%; padding: 12px 14px; margin-bottom: 12px;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text); outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.login-card input:focus {
  border-color: var(--border-strong); box-shadow: 0 0 0 3px var(--accent-soft);
}
.login-card button:not(.secondary) {
  width: 100%; padding: 12px; border: none; border-radius: var(--radius); cursor: pointer;
  background: var(--gradient-accent); color: var(--on-accent); font-weight: 700;
  box-shadow: 0 4px 16px var(--accent-glow);
}
.login-card button.secondary, button.secondary, .btn.secondary {
  width: 100%; padding: 12px;
  background: transparent; border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--muted); cursor: pointer; font-weight: 500;
}
.error { color: var(--danger); font-size: 13px; margin-top: 10px; min-height: 18px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 16px; line-height: 1.5; }
.hint a { color: var(--accent); }

.app { display: flex; min-height: 100vh; }
/* 桌面默认隐藏；≤768px 由 /shared/admin-responsive.css 显示抽屉 */
.sidebar-toggle,
.sidebar-backdrop { display: none; }
.sidebar {
  width: 228px; flex-shrink: 0; background: var(--sidebar); border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
}
.brand {
  padding: 22px 20px; font-weight: 800; letter-spacing: 0.14em;
  color: var(--accent); font-size: 13px; border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, var(--accent-soft), transparent);
  text-shadow: 0 0 16px var(--accent-glow);
}
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a {
  display: block; padding: 10px 20px; margin: 2px 10px;
  color: var(--muted); text-decoration: none; font-size: 13.5px; cursor: pointer;
  border-radius: var(--radius-sm); border-left: 2px solid transparent;
  transition: color .12s, background .12s;
}
.sidebar nav a:hover { color: var(--text); background: rgba(255,255,255,0.03); }
.sidebar nav a.active {
  color: var(--accent); background: var(--accent-soft);
  border-left-color: var(--accent);
  box-shadow: inset 0 0 0 1px rgba(56,189,248,0.1);
}
.logout-btn {
  margin: 12px; padding: 10px; background: transparent; border: 1px solid var(--border);
  color: var(--muted); border-radius: var(--radius); cursor: pointer;
}
.logout-btn:hover { color: var(--text); border-color: var(--border-strong); }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
  padding: 16px 24px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  background: linear-gradient(180deg, rgba(16,26,36,0.8), transparent);
  backdrop-filter: blur(8px);
}
.topbar h2 { font-size: 18px; font-weight: 650; }
.topbar span { color: var(--muted); font-size: 13px; }
.content { padding: 24px; flex: 1; overflow: auto; background: var(--bg-elevated); }

.cards {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 14px; margin-bottom: 20px;
}
.card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 18px; box-shadow: var(--shadow-sm); position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent); opacity: .4;
}
.card .label { color: var(--muted); font-size: 12px; letter-spacing: 0.03em; }
.card .value { font-size: 26px; font-weight: 700; margin-top: 6px; color: var(--accent); }
.note {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 16px; color: var(--muted); font-size: 13px; line-height: 1.6; margin-bottom: 20px;
}

.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; align-items: center; }
.toolbar input, .toolbar select, .form-grid input, .form-grid textarea, .form-grid select {
  padding: 8px 12px; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
}
.toolbar button, .btn {
  padding: 8px 14px; border: none; border-radius: var(--radius); cursor: pointer; font-size: 13px;
  background: var(--gradient-accent); color: var(--on-accent); font-weight: 600; width: auto;
}
.btn.secondary, .toolbar button.secondary {
  background: transparent; border: 1px solid var(--border); color: var(--muted); width: auto;
}
.btn.danger { background: transparent; border: 1px solid rgba(248,113,113,0.4); color: var(--danger); }
.btn.warn { background: transparent; border: 1px solid rgba(251,191,36,0.45); color: var(--warning); }
.section-block { margin-bottom: 16px; }
.section-block h3 { margin: 0 0 8px; font-size: 14px; color: var(--accent); font-weight: 650; }
.action-bar { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0 16px; }
.flag-bad { color: var(--danger); font-weight: 600; }
.flag-warn { color: var(--warning); font-weight: 600; }
.flag-ok { color: var(--success); }

table {
  width: 100%; border-collapse: collapse; background: var(--card);
  border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden;
  box-shadow: var(--shadow-sm);
}
th, td { padding: 9px 12px; text-align: left; border-bottom: 1px solid rgba(122,147,168,0.14); font-size: 13px; }
th { background: var(--accent-soft); color: var(--accent); font-weight: 650; font-size: 12px; }
tr:hover td { background: rgba(255,255,255,0.02); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; max-width: 720px; margin-bottom: 16px; }
.form-grid label { display: flex; flex-direction: column; gap: 6px; font-size: 12px; color: var(--muted); }
.form-grid .full { grid-column: 1 / -1; }
.form-grid textarea { min-height: 80px; resize: vertical; }
.tag {
  display: inline-block; padding: 2px 8px; border-radius: var(--radius-sm); font-size: 12px;
  background: var(--accent-soft); color: var(--accent);
}
.tag.off { background: rgba(122,147,168,0.15); color: var(--muted); }

.btn-sm { padding: 4px 10px; font-size: 12px; margin-right: 4px; }
.media-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; margin-top: 12px;
}
.media-card {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden;
}
.media-card img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; background: var(--surface); }
.media-meta { padding: 8px; font-size: 11px; color: var(--muted); display: flex; flex-direction: column; gap: 4px; }

.switch-row { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-size: 13px; }
.switch-row input { width: 16px; height: 16px; accent-color: var(--accent); cursor: pointer; }

.detail-dl {
  display: grid; grid-template-columns: 110px 1fr; gap: 6px 14px; margin-top: 10px; font-size: 13px;
}
.detail-dl dt { color: var(--muted); }
.detail-dl dd { color: var(--text); margin: 0; word-break: break-all; }

/* 窄屏侧栏/表格/触控见 /shared/admin-responsive.css */