:root {
      --indigo:        oklch(42% 0.20 275);
      --indigo-light:  oklch(55% 0.18 275);
      --indigo-dark:   oklch(24% 0.18 275);
      --indigo-deeper: oklch(16% 0.14 278);
      --amber:         oklch(70% 0.18 72);
      --success:       oklch(55% 0.12 155);
      --danger:        oklch(55% 0.18 25);
      --bg:        oklch(98.5% 0.005 80);
      --bg-2:      oklch(96.5% 0.008 80);
      --surface:   oklch(100% 0 0);
      --border:    oklch(90% 0.008 90);
      --text:      oklch(18% 0.015 270);
      --text-2:    oklch(38% 0.012 270);
      --text-3:    oklch(56% 0.008 270);
      /* AA variant for text under 14px on the page background — the shared
         56% token measures ~4.4:1 there. Mirrors landing's Batch 8 token. */
      --text-3-aa: oklch(50% 0.010 275);
      --r: 10px;
      --ui: 'Inter', ui-sans-serif, system-ui, -apple-system, sans-serif;
    }
    *, *::before, *::after { box-sizing: border-box; }
    body {
      margin: 0;
      font-family: var(--ui);
      font-size: 15px;
      line-height: 1.6;
      color: var(--text);
      background: var(--bg);
      -webkit-font-smoothing: antialiased;
    }

    /* ── Nav ── */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: oklch(16% 0.14 278 / 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid oklch(100% 0 0 / 0.08);
    }
    .nav-inner {
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 24px;
      height: 58px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .nav-brand {
      display: flex; align-items: center; gap: 10px;
      text-decoration: none;
      font-size: 17px; font-weight: 700;
      color: oklch(100% 0 0);
      letter-spacing: -0.02em;
    }
    .logo-mark {
      width: 28px; height: 28px; border-radius: 7px;
      background: var(--amber);
      display: flex; align-items: center; justify-content: center;
      flex-shrink: 0;
    }
    .nav-brand span { color: var(--amber); }
    .nav-back {
      font-size: 13.5px; font-weight: 500;
      color: oklch(100% 0 0 / 0.6);
      text-decoration: none;
      transition: color .15s;
    }
    .nav-back:hover { color: oklch(100% 0 0); }

    /* ── Hero ── */
    .hero {
      background: var(--indigo-deeper);
      padding: 110px 24px 56px;
      text-align: center;
    }
    .hero h1 {
      margin: 0 0 12px;
      font-size: clamp(28px, 5vw, 42px);
      font-weight: 700;
      color: oklch(100% 0 0);
      letter-spacing: -0.03em;
      line-height: 1.15;
      text-wrap: balance;  /* Batch 7 landing type refinement, rolled out */
    }
    .hero p {
      margin: 0 0 28px;
      font-size: 16px;
      color: oklch(100% 0 0 / 0.6);
      max-width: 480px;
      margin-left: auto;
      margin-right: auto;
    }
    .hero-search {
      max-width: 480px;
      margin: 0 auto;
      position: relative;
    }
    .hero-search svg {
      position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
      color: oklch(100% 0 0 / 0.35);
      pointer-events: none;
    }
    .hero-search input {
      width: 100%;
      padding: 12px 16px 12px 42px;
      border-radius: 10px;
      border: 1px solid oklch(100% 0 0 / 0.15);
      background: oklch(100% 0 0 / 0.07);
      color: oklch(100% 0 0);
      font-size: 14px;
      font-family: var(--ui);
      outline: none;
      transition: border-color .15s, background .15s;
    }
    .hero-search input::placeholder { color: oklch(100% 0 0 / 0.35); }
    .hero-search input:focus {
      border-color: oklch(100% 0 0 / 0.3);
      background: oklch(100% 0 0 / 0.1);
    }

    /* ── Layout ── */
    .page-wrap {
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 24px 80px;
    }

    /* ── Category cards ── */
    .categories {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 14px;
      padding: 40px 0 36px;
    }
    .cat-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--r);
      padding: 18px 18px 16px;
      text-decoration: none;
      color: var(--text);
      transition: border-color .15s, box-shadow .15s;
      position: relative;
      overflow: hidden;
    }
    .cat-card::before {
      content: '';
      position: absolute; top: 0; left: 0; right: 0;
      height: 3px;
      background: var(--indigo);
      border-radius: 2px 2px 0 0;
    }
    .cat-card:hover {
      border-color: var(--indigo-light);
      box-shadow: 0 2px 12px oklch(42% 0.20 275 / 0.1);
    }
    .cat-icon { font-size: 20px; margin-bottom: 8px; display: block; }
    .cat-title { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
    .cat-desc { font-size: 12.5px; color: var(--text-3); line-height: 1.5; }
    .cat-count {
      display: inline-block;
      margin-top: 10px;
      font-size: 11.5px;
      color: var(--indigo-light);
      font-weight: 500;
    }

    /* ── Content grid ── */
    .content-grid {
      display: grid;
      grid-template-columns: 1fr 300px;
      gap: 32px;
      align-items: start;
    }

    /* ── FAQ ── */
    .faq-section h2 {
      font-size: 11px;
      font-weight: 600;
      letter-spacing: .08em;
      text-transform: uppercase;
      color: var(--text-3);
      margin: 0 0 4px;
    }
    .faq-section h3 {
      font-size: 20px;
      font-weight: 700;
      letter-spacing: -0.02em;
      color: var(--text);
      margin: 0 0 6px;
    }
    .faq-intro {
      font-size: 13.5px;
      color: var(--text-2);
      margin: 0 0 20px;
    }
    .faq-intro a { color: var(--indigo-light); }

    details.faq-item {
      border: 1px solid var(--border);
      border-radius: var(--r);
      background: var(--surface);
      margin-bottom: 8px;
      overflow: hidden;
    }
    details.faq-item + details.faq-item { }
    summary.faq-q {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 15px 18px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text);
      cursor: pointer;
      list-style: none;
      gap: 12px;
      transition: background .12s;
    }
    summary.faq-q::-webkit-details-marker { display: none; }
    summary.faq-q:hover { background: var(--bg-2); }
    .faq-chevron {
      flex-shrink: 0;
      width: 16px; height: 16px;
      color: var(--text-3);
      transition: transform .2s;
    }
    details[open] .faq-chevron { transform: rotate(180deg); }
    .faq-answer {
      padding: 0 18px 16px;
      font-size: 13.5px;
      color: var(--text-2);
      line-height: 1.65;
    }
    .faq-answer p { margin: 0 0 10px; }
    .faq-answer p:last-child { margin-bottom: 0; }
    .faq-answer a { color: var(--indigo-light); }

    .faq-group-label {
      font-size: 11px;
      font-weight: 600;
      letter-spacing: .08em;
      text-transform: uppercase;
      color: var(--text-3-aa);
      margin: 28px 0 10px;
      padding-left: 2px;
    }

    /* ── Sidebar ── */
    .sidebar { display: flex; flex-direction: column; gap: 14px; }
    .sidebar-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--r);
      padding: 20px;
    }
    .sidebar-card h4 {
      margin: 0 0 6px;
      font-size: 14px;
      font-weight: 600;
    }
    .sidebar-card p {
      margin: 0 0 14px;
      font-size: 13px;
      color: var(--text-2);
      line-height: 1.55;
    }
    .btn-primary {
      display: inline-flex; align-items: center; gap: 7px;
      padding: 9px 16px;
      border-radius: 8px;
      background: var(--indigo);
      color: oklch(100% 0 0);
      font-size: 13.5px; font-weight: 600;
      font-family: var(--ui);
      text-decoration: none;
      border: none; cursor: pointer;
      transition: background .15s;
      width: 100%; justify-content: center;
    }
    .btn-primary:hover { background: var(--indigo-light); }
    .btn-secondary {
      display: inline-flex; align-items: center; gap: 7px;
      padding: 9px 16px;
      border-radius: 8px;
      background: transparent;
      color: var(--text-2);
      font-size: 13.5px; font-weight: 500;
      font-family: var(--ui);
      text-decoration: none;
      border: 1px solid var(--border); cursor: pointer;
      transition: border-color .15s, color .15s;
      width: 100%; justify-content: center;
    }
    .btn-secondary:hover { border-color: var(--indigo-light); color: var(--text); }
    .sla-badge {
      display: flex; align-items: center; gap: 7px;
      margin-top: 10px;
      font-size: 12px; color: var(--text-3);
    }
    .sla-dot {
      width: 7px; height: 7px; border-radius: 50%;
      background: var(--success); flex-shrink: 0;
    }
    .sidebar-links { display: flex; flex-direction: column; gap: 4px; }
    .sidebar-link {
      display: flex; align-items: center; gap: 8px;
      padding: 7px 0;
      font-size: 13px;
      color: var(--text-2);
      text-decoration: none;
      border-bottom: 1px solid var(--border);
      transition: color .12s;
    }
    .sidebar-link:last-child { border-bottom: none; }
    .sidebar-link:hover { color: var(--indigo-light); }
    .sidebar-card-accent {
      background: oklch(42% 0.20 275 / 0.06);
      border-color: oklch(42% 0.20 275 / 0.2);
    }
    .sidebar-card-accent h4 { color: var(--indigo-light); }

    /* ── Footer ── */
    footer {
      border-top: 1px solid var(--border);
      margin-top: 60px;
    }
    .footer-inner {
      max-width: 1100px;
      margin: 0 auto;
      padding: 24px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      flex-wrap: wrap;
    }
    .footer-brand {
      display: flex; align-items: center; gap: 8px;
      font-size: 14px; font-weight: 700;
      color: var(--text);
      text-decoration: none;
      letter-spacing: -0.02em;
    }
    .footer-brand span { color: var(--amber); }
    .footer-copy {
      font-size: 12.5px;
      color: var(--text-3-aa);
    }
    .footer-copy a { color: inherit; } /* .7 opacity dropped: it pushed 12.5px links under AA on the light footer */

    /* ── Contact modal ── */
    #contact-overlay {
      display: none;
      position: fixed; inset: 0; z-index: 1000;
      background: oklch(0% 0 0 / 0.55);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      align-items: center;
      justify-content: center;
      padding: 16px;
    }
    #contact-overlay.open { display: flex; }
    .modal {
      background: var(--surface);
      border-radius: 16px;
      box-shadow: 0 24px 80px oklch(0% 0 0 / 0.25);
      width: 100%;
      max-width: 480px;
      overflow: hidden;
    }
    .modal-head {
      padding: 22px 24px 18px;
      border-bottom: 1px solid var(--border);
      display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
    }
    .modal-head h3 { margin: 0 0 3px; font-size: 17px; font-weight: 700; letter-spacing: -0.02em; }
    .modal-head p { margin: 0; font-size: 13px; color: var(--text-2); }
    .modal-close {
      background: none; border: none; cursor: pointer; padding: 2px;
      color: var(--text-3); font-size: 20px; line-height: 1; flex-shrink: 0;
      transition: color .12s;
    }
    .modal-close:hover { color: var(--text); }
    .modal-body { padding: 20px 24px 24px; }
    .modal-success { padding: 40px 24px; text-align: center; }
    .success-icon {
      width: 56px; height: 56px; border-radius: 50%;
      background: oklch(55% 0.12 155 / 0.12);
      display: flex; align-items: center; justify-content: center;
      margin: 0 auto 16px;
    }
    .success-icon svg { color: var(--success); }
    .modal-success h3 { margin: 0 0 8px; font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
    .modal-success p { margin: 0 0 6px; font-size: 14px; color: var(--text-2); }
    .success-ref {
      display: inline-block;
      margin: 16px 0 24px;
      padding: 6px 14px;
      background: var(--bg-2);
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 12.5px;
      font-weight: 600;
      color: var(--text-3);
      letter-spacing: .05em;
    }
    .field { margin-bottom: 16px; }
    .field label {
      display: block;
      font-size: 12.5px; font-weight: 600;
      color: var(--text-2);
      margin-bottom: 6px;
      letter-spacing: .01em;
    }
    .field input, .field textarea {
      width: 100%;
      padding: 9px 12px;
      border: 1px solid var(--border);
      border-radius: 8px;
      font-size: 14px;
      font-family: var(--ui);
      color: var(--text);
      background: var(--bg);
      outline: none;
      transition: border-color .15s;
    }
    .field input:focus, .field textarea:focus { border-color: var(--indigo-light); }
    .field textarea { resize: vertical; min-height: 110px; line-height: 1.55; }
    .char-count { font-size: 11.5px; color: var(--text-3); text-align: right; margin-top: 4px; }
    .field-error { font-size: 12px; color: var(--danger); margin-top: 4px; display: none; }
    .field-error.visible { display: block; }

    .topic-pills { display: flex; flex-wrap: wrap; gap: 7px; }
    .topic-pill {
      padding: 5px 12px;
      border-radius: 20px;
      border: 1px solid var(--border);
      background: var(--bg);
      font-size: 12.5px; font-weight: 500;
      color: var(--text-2);
      cursor: pointer;
      transition: border-color .12s, background .12s, color .12s;
      user-select: none;
    }
    .topic-pill.selected {
      border-color: var(--indigo);
      background: oklch(42% 0.20 275 / 0.08);
      color: var(--indigo-light);
    }

    .error-banner {
      display: none;
      padding: 11px 14px;
      border-radius: 8px;
      background: oklch(55% 0.18 25 / 0.08);
      border: 1px solid oklch(55% 0.18 25 / 0.2);
      color: var(--danger);
      font-size: 13px;
      margin-bottom: 16px;
    }
    .error-banner.visible { display: block; }
    .error-banner a { color: inherit; font-weight: 600; }

    .modal-actions {
      display: flex; align-items: center; justify-content: flex-end; gap: 10px;
      margin-top: 20px;
    }
    .btn-cancel {
      padding: 9px 16px;
      border-radius: 8px;
      background: transparent;
      color: var(--text-2);
      font-size: 13.5px; font-weight: 500;
      font-family: var(--ui);
      border: 1px solid var(--border); cursor: pointer;
      transition: border-color .12s;
    }
    .btn-cancel:hover { border-color: var(--text-3); }
    .btn-send {
      padding: 9px 20px;
      border-radius: 8px;
      background: var(--indigo);
      color: oklch(100% 0 0);
      font-size: 13.5px; font-weight: 600;
      font-family: var(--ui);
      border: none; cursor: pointer;
      transition: background .15s;
    }
    .btn-send:hover { background: var(--indigo-light); }
    .btn-send:disabled { opacity: .5; cursor: not-allowed; }

    /* ── Responsive ── */
    @media (max-width: 900px) {
      .content-grid { grid-template-columns: 1fr; }
      .sidebar { flex-direction: row; flex-wrap: wrap; }
      .sidebar-card { flex: 1 1 280px; }
    }
    @media (max-width: 700px) {
      .categories { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 480px) {
      .categories { grid-template-columns: repeat(2, 1fr); gap: 10px; }
      .modal { border-radius: 12px; }
      .sidebar { flex-direction: column; }
      .sidebar-card { flex: unset; }
    }