:root {
      --accent: #087d85;
      --accent-hover: #096f76;
      --accent-soft: #e6f3f2;
      --ink: #172b31;
      --muted: #687a80;
      --line: #e5ebec;
      --page: #f5f7f7;
      --card: #ffffff;
      --shadow: 0 6px 24px rgba(31, 58, 62, 0.045);
      --amber: #9d6825;
      --amber-soft: #f6efe4;
      --amber-border: #ead7bc;
      --red: #c83e3b;
      --red-soft: #fdf2f2;
      --red-border: #f3c6c5;
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    [hidden] { display: none !important; }
    html, body { max-width: 100%; overflow-x: hidden; }
    body {
      font: 400 13px/1.5 'Be Vietnam Pro', system-ui, -apple-system, sans-serif;
      background: var(--page);
      color: var(--ink);
      min-height: 100vh;
      -webkit-font-smoothing: antialiased;
    }
    button, input, select { font: inherit; color: inherit; max-width: 100%; box-sizing: border-box; }
    button { cursor: pointer; }
    a { color: inherit; text-decoration: none; }
    button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, summary:focus-visible {
      outline: 3px solid #89c9c8;
      outline-offset: 3px;
    }
    .svg-sprite {
      position: absolute;
      visibility: hidden;
      pointer-events: none;
    }
    .icon {
      width: 20px;
      height: 20px;
      stroke: currentColor;
      fill: none;
      stroke-width: 1.8;
      stroke-linecap: round;
      stroke-linejoin: round;
      flex: none;
    }
    .app {
      display: grid;
      grid-template-columns: 248px minmax(0, 1fr);
      min-height: 100vh;
      max-width: 100%;
    }
    .sidebar {
      background: var(--card);
      border-right: 1px solid var(--line);
      padding: 28px 16px 20px;
      display: flex;
      flex-direction: column;
      gap: 30px;
    }
    .brand {
      font-size: 15px;
      font-weight: 600;
      padding: 4px 12px;
      color: var(--ink);
    }
    .nav-label {
      font-size: 11px;
      font-weight: 500;
      color: var(--muted);
      padding: 0 12px;
      margin: 0 0 8px;
    }
    .nav-list { display: grid; gap: 4px; }
    .nav-list a {
      min-height: 42px;
      display: flex;
      align-items: center;
      gap: 12px;
      padding: 0 12px;
      border-radius: 10px;
      font-weight: 500;
      color: var(--ink);
    }
    .nav-list a.active {
      background: var(--accent-soft);
      color: var(--accent);
    }
    .nav-list a:not(.active):hover {
      background: var(--page);
    }
    .sidebar-links {
      margin-top: auto;
      border-top: 1px solid var(--line);
      padding: 16px 12px 0;
      display: grid;
      gap: 10px;
      color: var(--muted);
      font-size: 12px;
    }
    .sidebar-links a:hover { color: var(--accent); }

    .main {
      padding: 20px 24px 36px;
      max-width: 1160px;
      width: 100%;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 0;
    }
    .top {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 12px;
      margin-bottom: 4px;
      flex-wrap: wrap;
    }
    h1 {
      font-size: 24px;
      line-height: 1.3;
      font-weight: 600;
      letter-spacing: -0.025em;
      margin-bottom: 4px;
    }
    h2 {
      font-size: 15px;
      line-height: 1.4;
      font-weight: 500;
    }
    .top p { color: var(--muted); font-size: 13px; }

    .card {
      background: var(--card);
      border: 1px solid var(--line);
      border-radius: 14px;
      padding: 14px 16px;
      box-shadow: var(--shadow);
      max-width: 100%;
      min-width: 0;
    }
    .card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 10px;
      gap: 10px;
      flex-wrap: wrap;
    }
    .badge {
      padding: 4px 10px;
      border-radius: 999px;
      font-size: 11px;
      font-weight: 500;
      border: 1px solid var(--line);
      background: var(--page);
      color: var(--muted);
    }
    .badge-tier1, .badge-pass { background: var(--accent-soft); color: var(--accent); border-color: #cce5e3; }
    .badge-tier2 { background: #edf5f6; color: #1d5c63; border-color: #cde0e3; }
    .badge-tier3 { background: var(--amber-soft); color: var(--amber); border-color: var(--amber-border); }
    .badge-fail { background: var(--red-soft); color: var(--red); border-color: var(--red-border); }

    .stack {
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-width: 0;
    }
    .grid-main, .auth-stack {
      display: grid;
      gap: 12px;
      min-width: 0;
    }
    .two-col, .auth-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 12px;
      min-width: 0;
    }

    .muted-compact {
      font-size: 12px;
      color: var(--muted);
      margin-top: 2px;
    }

    .qr-redirect-card {
      background: var(--card);
    }
    .qr-redirect-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
      flex-wrap: wrap;
    }

    .compact-details {
      padding: 12px 16px;
    }
    .details-summary {
      cursor: pointer;
      font-weight: 500;
      font-size: 14px;
      list-style: none;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 10px;
    }
    .details-summary::-webkit-details-marker { display: none; }
    .details-summary::after {
      content: '+';
      font-size: 16px;
      line-height: 1;
      color: var(--muted);
      flex: none;
    }
    .compact-details[open] .details-summary::after {
      content: '−';
    }
    .details-body {
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px solid var(--line);
      display: grid;
      gap: 10px;
      min-width: 0;
    }

    .session-banner {
      background: var(--accent-soft);
      border-color: #cce5e3;
      padding: 12px 16px;
    }
    .session-banner-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 10px;
    }
    .session-summary {
      font-weight: 600;
      color: var(--accent);
      font-size: 14px;
      overflow-wrap: anywhere;
    }
    .session-note {
      font-size: 12px;
      color: var(--ink);
      margin-top: 2px;
    }

    .steps-stack {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .step-panel {
      border: 1px solid var(--line);
      border-radius: 12px;
      padding: 14px 16px;
      background: #ffffff;
    }
    .step-panel summary {
      font-weight: 500;
      font-size: 14px;
      cursor: pointer;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
    }
    .step-panel summary::-webkit-details-marker { display: none; }
    .step-meta {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .step-tag {
      font-size: 11px;
      font-weight: 500;
      color: var(--accent);
    }
    .step-state {
      font-size: 12px;
      font-weight: 400;
      color: var(--muted);
    }
    .step-body {
      margin-top: 14px;
      padding-top: 14px;
      border-top: 1px solid var(--line);
    }

    .form-group { margin-bottom: 10px; }
    .form-group-compact { margin-bottom: 0; }
    .form-group label {
      display: block;
      font-size: 12px;
      color: var(--muted);
      margin-bottom: 5px;
      font-weight: 500;
    }
    .input-row {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      align-items: center;
      min-width: 0;
    }
    .input-row > * { min-width: 0; }
    .tier-select { max-width: 170px; }

    input[type="text"], input[type="password"], input[type="email"], select {
      flex: 1 1 160px;
      min-width: 0;
      min-height: 38px;
      background: var(--card);
      border: 1px solid var(--line);
      color: var(--ink);
      padding: 0 12px;
      border-radius: 10px;
      font-size: 13px;
    }

    .btn {
      min-height: 38px;
      padding: 0 14px;
      border-radius: 10px;
      border: 1px solid var(--line);
      background: #ffffff;
      color: var(--ink);
      font-weight: 500;
      font-size: 13px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      white-space: nowrap;
    }
    .btn:hover { filter: brightness(0.97); }
    .btn-compact { min-height: 36px; padding: 0 14px; font-size: 12.5px; }
    .btn-primary { background: var(--accent); color: #ffffff; border-color: var(--accent); }
    .btn-secondary { background: #ffffff; color: var(--ink); border: 1px solid var(--line); }
    .btn-link-sub {
      background: transparent;
      border: 0;
      color: var(--muted);
      font-weight: 500;
      font-size: 13px;
      padding: 8px 10px;
    }
    .btn-link-sub:hover { color: var(--accent); }
    .btn-danger { background: var(--red-soft); color: var(--red); border-color: var(--red-border); }
    .btn-sm { min-height: 36px; padding: 0 12px; font-size: 12px; border-radius: 8px; }

    .status-box {
      margin-top: 10px;
      padding: 10px 12px;
      border-radius: 10px;
      background: var(--page);
      border: 1px solid var(--line);
      font-size: 12.5px;
      font-weight: 400;
      color: var(--ink);
      overflow-wrap: anywhere;
    }
    .status-box-flush { margin-top: 0; }

    .sample-box {
      padding: 12px 14px;
      border-radius: 10px;
      background: var(--page);
      border: 1px solid var(--line);
      color: var(--ink);
      font-size: 13px;
      font-weight: 400;
      margin: 10px 0 14px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      font-size: 12.5px;
    }
    th, td {
      text-align: left;
      padding: 7px 9px;
      border-bottom: 1px solid var(--line);
      vertical-align: top;
    }
    th {
      color: var(--muted);
      font-weight: 500;
      font-size: 11px;
      background: var(--page);
    }
    .scroll-table {
      max-height: 220px;
      overflow: auto;
      max-width: 100%;
      border: 1px solid var(--line);
      border-radius: 10px;
    }
    .scroll-table-compact {
      max-height: 210px;
      margin-top: 10px;
    }
    .scroll-table-logs {
      max-height: 180px;
    }

    .mobile-nav { display: none; }

    @media (max-width: 700px) {
      html, body, .app, .main, .card { max-width: 100%; }
      .app { display: block; overflow-x: hidden; }
      .sidebar { display: none; }
      .main { padding: 16px 14px 86px; min-width: 0; overflow-x: hidden; }
      .card { overflow-x: hidden; }
      h1 { font-size: 21px; }
      .two-col, .auth-grid { grid-template-columns: 1fr; }
      .qr-redirect-row { flex-direction: column; align-items: stretch; }
      .qr-redirect-row .btn { width: 100%; }
      .input-row > * { min-width: 0; }
      .tier-select { max-width: 100%; flex: 1 1 100%; }
      .input-row .btn { width: 100%; }
      .mobile-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        z-index: 450;
        display: grid;
        grid-template-columns: repeat(5, minmax(0, 1fr));
        background: #ffffff;
        border-top: 1px solid var(--line);
        padding: 6px 4px max(8px, env(safe-area-inset-bottom));
        box-shadow: 0 -3px 16px rgba(31, 58, 62, 0.04);
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2px;
        min-height: 47px;
        color: var(--muted);
        font-size: 10px;
        font-weight: 500;
        border-radius: 9px;
        white-space: nowrap;
        overflow: hidden;
      }
      .mobile-nav a.active {
        background: var(--accent-soft);
        color: var(--accent);
      }
      .mobile-nav .icon { width: 18px; height: 18px; }
    }
    .btn-spinner {
      display: inline-block;
      width: 14px;
      height: 14px;
      border: 2px solid rgba(255, 255, 255, 0.35);
      border-top-color: currentColor;
      border-radius: 50%;
      animation: btn-spin 0.6s linear infinite;
      vertical-align: middle;
      margin-right: 6px;
      box-sizing: border-box;
    }
    @keyframes btn-spin {
      to { transform: rotate(360deg); }
    }
    .btn.loading {
      opacity: 0.85;
      pointer-events: none;
      cursor: not-allowed;
    }