body {
        font-family: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
        color: #0f172a;
      }
      .bg-layer { position: fixed; inset: 0; z-index: -1; background: radial-gradient(circle at 20% 20%, #f1f5ff 0%, #f7f3ff 40%, #f6f7fb 80%); }
      .shell { max-width: 980px; margin: 0 auto; padding: 32px 20px 80px; }
      .card { background: rgba(255, 255, 255, 0.9); border: 1px solid rgba(255, 255, 255, 0.7); backdrop-filter: blur(24px); border-radius: 24px; box-shadow: 0 20px 50px rgba(15, 23, 42, 0.08); }
      .field { width: 100%; border-radius: 12px; border: 1px solid rgba(148, 163, 184, 0.35); background: rgba(255, 255, 255, 0.85); padding: 10px 12px; font-size: 14px; }
      .field:focus { outline: none; border-color: rgba(59, 130, 246, 0.7); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2); }
      .btn { border-radius: 999px; padding: 10px 18px; font-size: 14px; font-weight: 600; transition: transform 0.15s ease, box-shadow 0.2s ease, opacity 0.2s ease; }
      .btn:active { transform: scale(0.98); }
      .btn-primary { background: #2563eb; color: #fff; box-shadow: 0 12px 24px rgba(37, 99, 235, 0.24); }
      .btn-ghost { background: rgba(148, 163, 184, 0.18); color: #334155; }
      .hidden { display: none !important; }
      .admin-nav { display: flex; flex-wrap: wrap; gap: 10px; background: rgba(15, 23, 42, 0.06); border-radius: 999px; padding: 8px; }
      .admin-nav button { padding: 8px 16px; border-radius: 999px; font-size: 13px; font-weight: 600; color: #475569; transition: background 0.2s ease, color 0.2s ease; }
      .admin-nav button.active { background: #111827; color: #fff; box-shadow: 0 10px 20px rgba(15, 23, 42, 0.2); }
      .admin-section { margin-top: 18px; }
      .list-item { display: flex; align-items: center; justify-content: space-between; padding: 12px 14px; border-radius: 16px; background: rgba(248, 250, 252, 0.9); border: 1px solid rgba(226, 232, 240, 0.7); }
      #toastContainer { position: fixed; right: 24px; bottom: 24px; z-index: 9999; }
      .toast { margin-top: 10px; padding: 10px 16px; border-radius: 16px; color: #fff; font-size: 13px; backdrop-filter: blur(8px); box-shadow: 0 12px 24px rgba(15, 23, 42, 0.2); }
      .toast.success { background: rgba(34, 197, 94, 0.85); }
      .toast.error { background: rgba(239, 68, 68, 0.85); }