:root {
      --bg: #f0f2f5;
      --panel: #fff;
      --line: #e5e7eb;
      --text: #111827;
      --muted: #6b7280;
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --fox: #ea580c;
      --fox-hover: #c2410c;
      --sidebar: #1e293b;
      --sidebar-text: #94a3b8;
      --danger: #dc2626;
      --ok: #16a34a;
      --wechat: #07c160;
      --douyin: #161823;
      --weibo: #e6162d;
      --radius: 8px;
      --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }
    * { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: var(--font);
      color: var(--text);
      background: var(--bg);
      min-height: 100vh;
    }
    button, input, select, textarea { font: inherit; }
    .hidden { display: none !important; }

    /* login */
    .login-wrap {
      min-height: 100vh;
      display: grid;
      place-items: center;
      background: linear-gradient(160deg, #e2e8f0, #f8fafc 50%, #dbeafe);
    }
    .login-card {
      width: 400px;
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 12px;
      padding: 32px;
    }
    .login-card h1 { margin: 0 0 4px; font-size: 22px; }
    .login-card .muted { color: var(--muted); font-size: 13px; margin: 0 0 20px; }
    .login-card label { display: block; font-size: 13px; color: var(--muted); margin: 14px 0 6px; }
    .login-card input { width: 100%; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; }
    .login-card .btn-primary { width: 100%; margin-top: 20px; }

    /* layout */
    .app { display: flex; min-height: 100vh; }
    .sidebar {
      width: 200px;
      background: var(--sidebar);
      color: var(--sidebar-text);
      padding: 16px 10px;
      flex-shrink: 0;
      display: flex;
      flex-direction: column;
      gap: 4px;
    }
    .brand {
      color: #fff;
      font-weight: 700;
      font-size: 17px;
      padding: 10px 12px 18px;
    }
    .brand small {
      display: block;
      margin-top: 4px;
      font-size: 11px;
      font-weight: 400;
      color: #64748b;
    }
    .nav-group {
      font-size: 11px;
      color: #64748b;
      padding: 12px 12px 6px;
      text-transform: uppercase;
      letter-spacing: 0.04em;
    }
    .nav-btn {
      border: 0;
      background: transparent;
      color: inherit;
      text-align: left;
      padding: 10px 12px;
      border-radius: 8px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .nav-btn:hover { background: rgba(255,255,255,0.06); color: #e2e8f0; }
    .nav-btn.active { background: #2563eb; color: #fff; }
    .nav-dot {
      width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
    }
    .nav-dot.douyin { background: #fff; }
    .nav-dot.weibo { background: var(--weibo); }
    .nav-dot.wechat { background: var(--wechat); }

    .main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
    .topbar {
      height: 52px;
      background: var(--panel);
      border-bottom: 1px solid var(--line);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
    }
    .topbar .title { font-weight: 600; font-size: 16px; }
    .topbar .user { color: var(--muted); font-size: 13px; }
    .content { padding: 20px; }

    .page { display: none; }
    .page.active { display: block; }

    .panel {
      background: var(--panel);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 16px;
    }

    .search-bar {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      align-items: center;
      margin-bottom: 14px;
    }
    .search-bar input[type="text"] {
      flex: 1;
      min-width: 180px;
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 9px 12px;
    }
    .search-bar select {
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 9px 10px;
      background: #fff;
      min-width: 120px;
    }
    .btn {
      border: 1px solid var(--line);
      background: #fff;
      border-radius: 8px;
      padding: 8px 14px;
      cursor: pointer;
      color: var(--text);
      white-space: nowrap;
    }
    .btn:hover { background: #f8fafc; }
    .btn-primary {
      background: var(--primary);
      border-color: var(--primary);
      color: #fff;
    }
    .btn-primary:hover { background: var(--primary-hover); }
    .btn-fox {
      background: var(--fox);
      border-color: var(--fox);
      color: #fff;
    }
    .btn-fox:hover { background: var(--fox-hover); }
    .btn-sm {
      padding: 4px 8px;
      font-size: 12px;
      border-radius: 6px;
    }
    .btn-danger { color: var(--danger); border-color: #fecaca; }
    .btn-ok { color: var(--ok); border-color: #bbf7d0; }
    .btn-muted { color: var(--muted); }

    .banner {
      display: none;
      margin-bottom: 12px;
      padding: 10px 12px;
      border-radius: 8px;
      font-size: 13px;
      background: #fff7ed;
      border: 1px solid #fed7aa;
      color: #9a3412;
    }
    .banner.show { display: block; }
    .banner.ok {
      background: #f0fdf4;
      border-color: #bbf7d0;
      color: #166534;
    }

    table { width: 100%; border-collapse: collapse; font-size: 13px; }
    th, td {
      text-align: left;
      padding: 10px 8px;
      border-bottom: 1px solid var(--line);
      vertical-align: middle;
    }
    th { color: var(--muted); font-weight: 600; font-size: 12px; }
    td.actions {
      white-space: nowrap;
    }
    td.actions .btn { margin: 2px 2px; }

    .tag {
      display: inline-block;
      padding: 2px 8px;
      border-radius: 999px;
      font-size: 12px;
      background: #f3f4f6;
    }
    .tag.used { background: #dcfce7; color: var(--ok); }
    .tag.unused { background: #f3f4f6; color: #4b5563; }
    .tag.ai { background: #dbeafe; color: #1d4ed8; }
    .tag.fox { background: #ffedd5; color: #c2410c; }
    .tag.db { background: #e0e7ff; color: #4338ca; }

    .title-cell { max-width: 320px; }
    .title-cell .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }

    .form-row { margin-bottom: 14px; }
    .form-row label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
    .form-row input, .form-row select, .form-row textarea {
      width: 100%;
      max-width: 480px;
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 9px 12px;
    }
    .form-hint { font-size: 12px; color: var(--muted); margin-top: 6px; }

    /* modal */
    .modal-mask {
      position: fixed; inset: 0;
      background: rgba(15, 23, 42, 0.45);
      display: none;
      align-items: center;
      justify-content: center;
      z-index: 50;
      padding: 20px;
    }
    .modal-mask.show { display: flex; }
    .modal {
      background: #fff;
      border-radius: 12px;
      width: min(900px, 100%);
      max-height: 90vh;
      overflow: auto;
      padding: 20px;
    }
    .modal h3 { margin: 0 0 12px; }
    .modal-actions {
      display: flex;
      gap: 8px;
      justify-content: flex-end;
      margin-top: 16px;
    }
    .split {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
    }
    .box {
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 12px;
      min-height: 220px;
      font-size: 13px;
      line-height: 1.6;
      white-space: pre-wrap;
      background: #f8fafc;
    }
    .box.edit {
      background: #fff;
      outline: none;
    }
    .link-title {
      color: var(--primary);
      cursor: pointer;
      text-decoration: none;
      font-weight: 600;
      background: none;
      border: none;
      padding: 0;
      font: inherit;
      text-align: left;
    }
    .link-title:hover { text-decoration: underline; }
    .detail-meta {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 16px;
      font-size: 13px;
      color: var(--muted);
      margin-bottom: 16px;
    }
    .detail-toolbar {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      align-items: center;
      margin-bottom: 14px;
    }
    .empty-ai {
      color: var(--muted);
      font-size: 13px;
      padding: 24px 12px;
      text-align: center;
    }
    @media (max-width: 900px) {
      .split { grid-template-columns: 1fr; }
      .sidebar { width: 160px; }
    }

.nav-btn { text-decoration: none; color: inherit; }
a.nav-btn:visited { color: inherit; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }