.font-serif { font-family: 'IBM Plex Serif', Georgia, serif; }
  .mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }
  a { color: inherit; text-decoration: none; }
  
  /* ---------- Buttons ---------- */
  .btn-sm { padding: .5rem .875rem; font-size: .8125rem; }

  /* ---------- Page ---------- */
  .page { max-width: 1160px; margin: 0 auto; padding: 0 1.5rem 5rem; }
  @media (min-width: 768px) { .page { padding: 0 2.5rem 6rem; } }

  .crumb {
    display: flex; align-items: center; gap: .5rem;
    padding: 1.5rem 0 1rem; font-size: .8125rem; color: var(--muted);
  }
  .crumb a { color: var(--muted); transition: color .15s ease; }
  .crumb a:hover { color: var(--ink); }
  .crumb .sep { color: var(--border-strong); }
  .crumb .current { color: var(--ink); font-weight: 500; }

  /* ---------- Hero ---------- */
  .help-hero {
    text-align: center;
    padding: 2rem 0 3rem;
    border-bottom: 1px solid var(--border-strong);
    margin-bottom: 3rem;
  }
  @media (min-width: 768px) { .help-hero { padding: 3rem 0 4rem; } }

  .help-eyebrow {
    display: inline-flex; align-items: center; gap: .5rem;
    font-size: .6875rem; font-weight: 600;
    letter-spacing: .1em; text-transform: uppercase;
    color: var(--accent); margin-bottom: 1rem;
  }
  .help-eyebrow::before,
  .help-eyebrow::after {
    content: ''; width: 20px; height: 1px; background: var(--accent);
  }

  .help-title {
    font-family: 'IBM Plex Serif', Georgia, serif;
    font-size: 2rem; font-weight: 500; line-height: 1.15;
    letter-spacing: -.02em; margin: 0 auto 1rem;
    color: var(--ink);
    max-width: 720px;
  }
  @media (min-width: 768px) { .help-title { font-size: 2.75rem; } }

  .help-sub {
    font-size: 1.0625rem; line-height: 1.6;
    color: var(--ink-soft); margin: 0 auto 2rem;
    max-width: 560px;
  }

  /* ---------- Search ---------- */
  .search-wrap {
    max-width: 640px;
    margin: 0 auto;
    position: relative;
  }
  .search-input {
    width: 100%;
    padding: 1rem 1rem 1rem 3rem;
    font-size: 1rem; font-family: inherit;
    color: var(--ink);
    background: #fff;
    border: 1px solid var(--border-strong);
    border-radius: 8px;
    transition: border-color .15s ease, box-shadow .15s ease;
  }
  .search-input:focus {
    outline: none; border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(30,58,95,.08);
  }
  .search-input::placeholder { color: var(--muted-2); }

  .search-icon {
    position: absolute; left: 1rem; top: 50%; transform: translateY(-50%);
    color: var(--muted); pointer-events: none;
  }

  .search-suggestions {
    display: flex; flex-wrap: wrap; gap: .5rem;
    justify-content: center;
    margin-top: 1rem;
    font-size: .8125rem;
    color: var(--muted);
  }
  .search-suggestions span { padding-top: .25rem; }
  .search-tag {
    padding: .3125rem .625rem;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: .75rem;
    color: var(--ink-soft);
    cursor: pointer;
    font-family: inherit;
    transition: background .15s ease, border-color .15s ease, color .15s ease;
  }
  .search-tag:hover {
    background: var(--accent-soft);
    border-color: var(--accent);
    color: var(--accent);
  }

  /* ---------- Category grid ---------- */
  .category-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 4rem;
  }
  @media (min-width: 640px) { .category-grid { grid-template-columns: repeat(2, 1fr); } }
  @media (min-width: 1024px) { .category-grid { grid-template-columns: repeat(3, 1fr); } }

  .category-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem 1.375rem;
    cursor: pointer;
    transition: border-color .15s ease, transform .15s ease;
    text-align: left;
    font-family: inherit;
    color: inherit;
    display: flex; flex-direction: column;
    gap: .625rem;
  }
  .category-card:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
  }

  .category-icon {
    width: 40px; height: 40px;
    border-radius: 8px;
    background: var(--accent-soft); color: var(--accent);
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: .25rem;
  }
  .category-title {
    font-family: 'IBM Plex Serif', Georgia, serif;
    font-size: 1.0625rem; font-weight: 500;
    line-height: 1.35;
    color: var(--ink);
    margin: 0;
    letter-spacing: -.005em;
  }
  .category-desc {
    font-size: .8125rem; color: var(--muted);
    line-height: 1.55;
    margin: 0;
  }
  .category-count {
    font-family: 'IBM Plex Mono', monospace;
    font-size: .6875rem; font-weight: 500;
    letter-spacing: .04em;
    color: var(--muted-2);
    margin-top: auto;
    padding-top: .75rem;
  }

  /* ---------- FAQ section ---------- */
  .faq-section {
    margin-bottom: 3rem;
    scroll-margin-top: 96px;
  }
  .faq-section:last-of-type { margin-bottom: 0; }

  .faq-head {
    display: flex; align-items: baseline;
    gap: 1rem;
    padding-bottom: .75rem; margin-bottom: 1rem;
    border-bottom: 1px solid var(--border-strong);
  }
  .faq-section-title {
    font-family: 'IBM Plex Serif', Georgia, serif;
    font-size: 1.375rem; font-weight: 500;
    line-height: 1.3; letter-spacing: -.01em;
    color: var(--ink); margin: 0;
  }
  @media (min-width: 768px) { .faq-section-title { font-size: 1.5rem; } }
  .faq-section-count {
    font-family: 'IBM Plex Mono', monospace;
    font-size: .75rem; color: var(--muted);
    margin-left: auto;
    font-variant-numeric: tabular-nums;
  }

  /* ---------- FAQ item ---------- */
  .faq-list {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
  }

  .faq-item {
    border-bottom: 1px solid var(--border);
  }
  .faq-item:last-child { border-bottom: none; }

  .faq-question {
    display: flex; align-items: flex-start; gap: 1rem;
    padding: 1.125rem 1.5rem;
    cursor: pointer;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
    color: inherit;
    transition: background .15s ease;
  }
  .faq-question:hover { background: var(--bg-hover); }

  .faq-q-text {
    flex: 1;
    font-size: .9375rem; font-weight: 500;
    color: var(--ink);
    line-height: 1.5;
    padding-right: .5rem;
  }
  @media (min-width: 768px) { .faq-q-text { font-size: 1rem; } }

  .faq-chevron {
    width: 20px; height: 20px; flex-shrink: 0;
    color: var(--muted);
    display: inline-flex; align-items: center; justify-content: center;
    transition: transform .25s ease, color .15s ease;
    margin-top: .125rem;
  }
  .faq-item.open .faq-chevron {
    transform: rotate(180deg);
    color: var(--accent);
  }

  .faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height .3s ease, padding .3s ease;
    padding: 0 1.5rem;
  }
  .faq-item.open .faq-answer {
    max-height: 800px;
    padding: 0 1.5rem 1.5rem;
  }

  .faq-answer-inner {
    padding-top: .25rem;
    padding-left: 0;
    font-size: .9375rem;
    line-height: 1.7;
    color: var(--ink-soft);
    border-top: 1px solid var(--border);
    padding-top: 1rem;
    margin-top: .25rem;
  }
  .faq-answer-inner p { margin: 0 0 .75rem; }
  .faq-answer-inner p:last-child { margin-bottom: 0; }
  .faq-answer-inner strong { color: var(--ink); font-weight: 500; }
  .faq-answer-inner ol, .faq-answer-inner ul {
    margin: .5rem 0 .75rem; padding-left: 1.25rem;
  }
  .faq-answer-inner li { margin-bottom: .375rem; }
  .faq-answer-inner a {
    color: var(--accent);
    border-bottom: 1px solid rgba(30,58,95,.25);
  }
  .faq-answer-inner a:hover { border-bottom-color: var(--accent); }
  .faq-answer-inner code {
    font-family: 'IBM Plex Mono', monospace;
    font-size: .8125rem;
    background: var(--bg-alt);
    padding: .125rem .375rem;
    border-radius: 3px;
  }

  /* ---------- No results ---------- */
  .no-results {
    padding: 3rem 1.5rem;
    text-align: center;
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
  }
  .no-results-icon {
    width: 48px; height: 48px; border-radius: 50%;
    background: var(--bg-alt); color: var(--muted);
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: 1rem;
  }
  .no-results-title {
    font-size: .9375rem; font-weight: 500;
    color: var(--ink); margin: 0 0 .375rem;
  }
  .no-results-desc {
    font-size: .875rem; color: var(--muted);
    line-height: 1.55; margin: 0 0 1.25rem;
    max-width: 400px;
    margin-left: auto; margin-right: auto;
  }

  /* ---------- Contact section ---------- */
  .contact-section {
    margin-top: 4rem;
    padding-top: 3rem;
    border-top: 1px solid var(--border-strong);
  }
  .contact-head {
    text-align: center;
    margin-bottom: 2rem;
  }
  .contact-title {
    font-family: 'IBM Plex Serif', Georgia, serif;
    font-size: 1.5rem; font-weight: 500;
    letter-spacing: -.01em;
    color: var(--ink); margin: 0 0 .5rem;
  }
  @media (min-width: 768px) { .contact-title { font-size: 1.75rem; } }
  .contact-desc {
    font-size: .9375rem; color: var(--muted);
    margin: 0 auto; max-width: 480px;
    line-height: 1.6;
  }

  .contact-grid {
    display: grid; grid-template-columns: 1fr; gap: 1rem;
  }
  @media (min-width: 768px) { .contact-grid { grid-template-columns: repeat(3, 1fr); } }

  .contact-card {
    background: #fff;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem 1.375rem;
    text-align: left;
  }
  .contact-card-icon {
    width: 36px; height: 36px; border-radius: 8px;
    background: var(--accent-soft); color: var(--accent);
    display: inline-flex; align-items: center; justify-content: center;
    margin-bottom: .875rem;
  }
  .contact-card-title {
    font-size: .9375rem; font-weight: 600;
    color: var(--ink); margin: 0 0 .375rem;
  }
  .contact-card-desc {
    font-size: .8125rem; color: var(--muted);
    line-height: 1.55; margin: 0 0 1rem;
  }
  .contact-card-link {
    display: inline-flex; align-items: center; gap: .375rem;
    font-size: .8125rem; font-weight: 500;
    color: var(--accent);
    border-bottom: 1px solid rgba(30,58,95,.3);
    padding-bottom: 1px;
    transition: border-color .15s ease;
  }
  .contact-card-link:hover { border-bottom-color: var(--accent); }

  /* ---------- Toast ---------- */
  .toast {
    position: fixed; bottom: 1.5rem; left: 50%;
    transform: translateX(-50%) translateY(120%);
    background: var(--ink); color: #fff; font-size: .875rem;
    padding: .75rem 1.25rem; border-radius: 6px; z-index: 120;
    box-shadow: 0 4px 16px rgba(0,0,0,.12);
    transition: transform .25s ease;
    display: flex; align-items: center; gap: .625rem;
    max-width: calc(100vw - 2rem);
  }
  .toast.on { transform: translateX(-50%) translateY(0); }
  .toast .check {
    width: 16px; height: 16px; border-radius: 50%; background: var(--success);
    display: inline-flex; align-items: center; justify-content: center; flex-shrink: 0;
  }

  @media (prefers-reduced-motion: reduce) {
    * { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  }