:root {
      --bg: #0f1117; --surface: #161b27; --card: #1e2535;
      --border: rgba(255,255,255,0.08); --text: #e8ecf4;
      --text-muted: #8a95aa; --accent: #3b82f6; --accent-hover: #2563eb;
      --danger: #ef4444; --radius: 12px;
      color-scheme: dark;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body { font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, 'Apple Color Emoji', 'Segoe UI Emoji', 'Noto Color Emoji', sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }

    /* Top bar */
    .top-bar {
      display: flex; align-items: center; justify-content: space-between;
      padding: 0 32px; height: 56px; background: var(--surface);
      border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100;
    }
    .top-bar-logo { font-size: 16px; font-weight: 700; color: var(--text); text-decoration: none; display: flex; align-items: center; gap: 8px; }
    .top-bar-logo span { color: var(--accent); }
    .top-bar-right { display: flex; align-items: center; gap: 12px; }
    .top-bar-user { font-size: 12px; color: var(--text-muted); }

    /* Page content */
    .page { max-width: 820px; margin: 0 auto; padding: 40px 24px 80px; }
    .page-title { font-size: 26px; font-weight: 700; margin-bottom: 6px; }
    .page-subtitle { font-size: 14px; color: var(--text-muted); margin-bottom: 28px; }

    /* Tab bar */
    .tab-bar { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 28px; }
    .tab-btn {
      padding: 10px 20px; font-size: 14px; font-weight: 500; color: var(--text-muted);
      background: none; border: none; border-bottom: 2px solid transparent;
      cursor: pointer; transition: color 0.15s, border-color 0.15s;
    }
    .tab-btn:hover { color: var(--text); }
    .tab-btn.active { color: var(--text); border-bottom-color: var(--accent); }

    /* Buttons */
    .btn { display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px; font-size: 13px; font-weight: 600; border-radius: 8px; border: 1px solid var(--border); cursor: pointer; transition: background 0.15s, border-color 0.15s; font-family: inherit; }
    .btn-primary { background: var(--accent); color: #fff; border-color: transparent; }
    .btn-primary:hover { background: var(--accent-hover); }
    .btn-secondary { background: var(--card); color: var(--text); }
    .btn-secondary:hover { border-color: rgba(255,255,255,0.15); }

    /* Forms */
    .form-group { margin-bottom: 14px; }
    .form-group label { display: block; font-size: 11px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 5px; }
    .form-group input, .form-group select, .form-group textarea {
      width: 100%; padding: 9px 12px; background: var(--bg); border: 1px solid var(--border);
      border-radius: 8px; color: var(--text); font-size: 14px; font-family: inherit;
    }
    .form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--accent); }
    .form-group textarea { resize: vertical; }

    /* Search */
    .search-wrap { position: relative; margin-bottom: 18px; }
    .search-wrap i { position: absolute; left: 11px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 15px; }
    .search-wrap input { width: 100%; padding: 9px 12px 9px 34px; background: var(--card); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: 13px; font-family: inherit; }
    .search-wrap input:focus { outline: none; border-color: var(--accent); }

    /* Category pills */
    .pill-row { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 18px; }
    .pill { padding: 5px 14px; font-size: 12px; font-weight: 600; border-radius: 20px; border: 1px solid var(--border); background: var(--card); color: var(--text-muted); cursor: pointer; transition: all 0.15s; }
    .pill:hover { color: var(--text); border-color: rgba(255,255,255,0.15); }
    .pill.active { background: rgba(59,130,246,0.15); color: var(--accent); border-color: rgba(59,130,246,0.3); }

    /* FAQ cards */
    .faq-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 8px; cursor: pointer; transition: border-color 0.15s; }
    .faq-card:hover { border-color: rgba(59,130,246,0.28); }
    .faq-card-title { font-size: 14px; font-weight: 600; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
    .faq-card-body { font-size: 13px; color: var(--text-muted); display: none; margin-top: 12px; line-height: 1.7; }
    .faq-card-body p { margin-bottom: 8px; }
    .faq-card-body ul, .faq-card-body ol { margin: 8px 0 8px 20px; }
    .faq-card.open .faq-card-body { display: block; }
    .faq-card .ti-chevron-down { transition: transform 0.2s ease; }
    .faq-card.open .ti-chevron-down { transform: rotate(180deg); }

    /* Ticket cards */
    .ticket-status { display: inline-flex; align-items: center; font-size: 10px; font-weight: 700; padding: 2px 7px; border-radius: 10px; border: 1px solid; }
    .ticket-status.open        { background: rgba(59,130,246,0.1); color: #60a5fa; border-color: rgba(59,130,246,0.25); }
    .ticket-status.in-progress { background: rgba(245,158,11,0.1); color: #fbbf24; border-color: rgba(245,158,11,0.25); }
    .ticket-status.resolved    { background: rgba(34,197,94,0.1);  color: #4ade80; border-color: rgba(34,197,94,0.2); }
    .ticket-card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 8px; }
    .ticket-card-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; }
    .ticket-card-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

    /* Auth gate overlay */
    .auth-gate {
      background: var(--card); border: 1px solid var(--border); border-radius: var(--radius);
      padding: 48px 32px; text-align: center; margin-top: 24px;
    }
    .auth-gate i { font-size: 36px; color: var(--text-muted); margin-bottom: 16px; display: block; }
    .auth-gate p { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; }

    /* Empty state */
    .empty-state { text-align: center; padding: 48px 32px; color: var(--text-muted); }
    .empty-state i { font-size: 36px; display: block; margin-bottom: 12px; }
    .empty-state p { font-size: 13px; }

    /* Toast */
    #toastContainer { position: fixed; bottom: 24px; right: 24px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
    .toast { padding: 10px 16px; border-radius: 8px; font-size: 13px; font-weight: 500; max-width: 320px; animation: fadeIn 0.2s ease; }
    .toast.success { background: #14532d; color: #4ade80; border: 1px solid #166534; }
    .toast.error   { background: #450a0a; color: #f87171; border: 1px solid #991b1b; }
    .toast.info    { background: var(--card); color: var(--text); border: 1px solid var(--border); }
    @keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
    @keyframes spin { to { transform: rotate(360deg); } }
    .spin, .ti-spin { display: inline-block; animation: spin 0.8s linear infinite; }