:root {
    --paper: #EFEDE6;
    --ink: #181B18;
    --muted: #6C6A5F;
    --line: #D7D3C5;
    --surface: #E6E2D5;
    --accent: #1E6F5C;
    --accent-ink: #F3F1E9;
    --accent-2: #9C7A3B;
  }

  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      --paper: #14160F;
      --ink: #ECE9DD;
      --muted: #9B9788;
      --line: #2D2F27;
      --surface: #1B1D16;
      --accent: #43AE90;
      --accent-ink: #10130E;
      --accent-2: #D2AD6C;
    }
  }

  :root[data-theme="dark"] {
    --paper: #14160F;
    --ink: #ECE9DD;
    --muted: #9B9788;
    --line: #2D2F27;
    --surface: #1B1D16;
    --accent: #43AE90;
    --accent-ink: #10130E;
    --accent-2: #D2AD6C;
  }

  * { box-sizing: border-box; }

  body {
    background: var(--paper);
    color: var(--ink);
    font-family: "Work Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    padding-inline: 24px;
    -webkit-font-smoothing: antialiased;
  }

  h1, h2, h3 {
    font-family: "Fraunces", Georgia, "Times New Roman", serif;
    font-weight: 480;
    line-height: 1.1;
    margin: 0;
    text-wrap: balance;
    letter-spacing: -0.01em;
  }

  a { color: inherit; }
  a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

  .eyebrow {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
    margin: 0 0 14px;
  }

  .wrap { max-width: 780px; margin-inline: auto; }
  .wrap-wide { max-width: 960px; margin-inline: auto; }

  /* ---- header ---- */
  .site-header {
    position: sticky;
    top: env(safe-area-inset-top, 0px);
    z-index: 10;
    background: color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter: blur(6px);
    border-bottom: 1px solid var(--line);
    padding-block: 16px;
  }
  .site-header .wrap-wide {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
  }
  .wordmark {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.82rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-decoration: none;
    white-space: nowrap;
  }
  .site-nav {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
    font-size: 0.84rem;
  }
  .site-nav a { text-decoration: none; color: var(--muted); transition: color 0.15s ease; }
  .site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }

  /* ---- page intro ---- */
  .page-hero { padding-block: 56px 40px; max-width: 720px; }
  .page-hero h1 { font-size: clamp(1.9rem, 4.6vw, 2.9rem); }
  .page-hero .lede {
    margin: 20px 0 0;
    max-width: 58ch;
    color: var(--muted);
    font-size: 1.05rem;
  }

  /* ---- hero mark (homepage) ---- */
  .page-hero.hero-grid {
    max-width: none;
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(200px, 1fr);
    gap: 32px;
    align-items: center;
  }
  .hero-mark svg { display: block; width: 100%; height: auto; }
  .mark-label {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 11px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
  }

  .cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--accent);
    color: var(--accent-ink);
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 500;
    padding: 13px 22px;
    border-radius: 3px;
    transition: opacity 0.15s ease;
    margin-top: 26px;
  }
  .cta:hover { opacity: 0.86; }
  .cta.ghost {
    background: none;
    border: 1px solid var(--line);
    color: var(--ink);
  }
  .cta.ghost:hover { border-color: var(--accent); opacity: 1; }

  /* ---- index strip ---- */
  .index {
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }
  .index-item {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 20px 18px;
    text-decoration: none;
    color: var(--ink);
    border-left: 1px solid var(--line);
    transition: background 0.15s ease;
  }
  .index-item:first-child { border-left: none; }
  .index-item:hover { background: var(--surface); }
  .index-num {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.08em;
  }
  .index-name { font-family: "Fraunces", serif; font-size: 1.05rem; font-weight: 480; }
  .index-status {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
  }
  .index-status.is-active { color: var(--accent); }

  /* ---- sections ---- */
  .section {
    padding-block: 48px;
    border-bottom: 1px solid var(--line);
    scroll-margin-top: 84px;
  }
  .section.no-border { border-bottom: none; }
  .section h2 { font-size: clamp(1.5rem, 3.2vw, 2rem); margin-bottom: 16px; }
  .section .body-text { max-width: 62ch; color: var(--ink); }
  .section .body-text + .body-text { margin-top: 14px; }

  .services {
    margin: 30px 0 0;
    display: grid;
    gap: 0;
    border-top: 1px solid var(--line);
  }
  .service {
    display: block;
    padding-block: 20px;
    border-bottom: 1px solid var(--line);
    text-decoration: none;
    color: var(--ink);
    transition: background 0.15s ease;
  }
  .service:hover { background: var(--surface); }
  .service .service-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
  }
  .service dt, .service .service-title {
    font-family: "Fraunces", serif;
    font-weight: 480;
    font-size: 1.05rem;
  }
  .service .service-arrow { font-family: "IBM Plex Mono", monospace; font-size: 0.8rem; color: var(--accent); }
  .service dd, .service .service-desc { margin: 6px 0 0; color: var(--muted); max-width: 52ch; }

  /* ---- how we work ---- */
  .principles {
    margin-top: 10px;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border-top: 1px solid var(--line);
  }
  .principle {
    padding: 22px 20px 4px 0;
    border-left: 1px solid var(--line);
    padding-left: 20px;
  }
  .principle:first-child { border-left: none; padding-left: 0; }
  .p-num {
    display: block;
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.72rem;
    color: var(--accent-2);
    letter-spacing: 0.1em;
    margin-bottom: 10px;
  }
  .principle p { margin: 0; color: var(--muted); }

  /* ---- related / cross links ---- */
  .related {
    padding-block: 40px;
  }
  .related h3 {
    font-size: 1rem;
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
    color: var(--muted);
    margin-bottom: 18px;
  }
  .related-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 28px;
    padding: 0;
    margin: 0;
    list-style: none;
  }
  .related-list a {
    text-decoration: none;
    border-bottom: 1px solid var(--line);
    padding-bottom: 2px;
    font-family: "Fraunces", serif;
    font-size: 1rem;
  }
  .related-list a:hover { border-color: var(--accent); color: var(--accent); }

  /* ---- contact ---- */
  .contact-body { max-width: 50ch; color: var(--muted); margin: 20px 0 0; }

  /* ---- footer ---- */
  footer.site-footer {
    padding-block: 40px 48px;
    border-top: 1px solid var(--line);
    margin-top: 20px;
  }
  .footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
    margin-bottom: 32px;
  }
  .footer-col h4 {
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.68rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 12px;
    font-weight: 500;
  }
  .footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
  .footer-col a { text-decoration: none; color: var(--ink); font-size: 0.88rem; }
  .footer-col a:hover { color: var(--accent); }
  .footer-meta {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--muted);
    padding-top: 20px;
    border-top: 1px solid var(--line);
  }

  @media (max-width: 900px) and (min-width: 641px) {
    .principles { grid-template-columns: repeat(2, 1fr); }
    .principle:nth-child(2n+1) { border-left: none; padding-left: 0; }
    .index { grid-template-columns: repeat(2, 1fr); }
    .index-item:nth-child(2n+1) { border-left: none; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .page-hero.hero-grid { grid-template-columns: 1fr; }
    .hero-mark { max-width: 340px; margin: 0 auto; order: -1; }
  }

  @media (max-width: 640px) {
    .site-nav { display: none; }
    .index { grid-template-columns: 1fr; }
    .index-item { border-left: none; border-top: 1px solid var(--line); }
    .index-item:first-child { border-top: none; }
    .principles { grid-template-columns: 1fr; }
    .principle { border-left: none; border-top: 1px solid var(--line); padding-left: 0; padding-top: 22px; }
    .principle:first-child { border-top: none; }
    .footer-grid { grid-template-columns: 1fr; gap: 22px; }
    .page-hero.hero-grid { grid-template-columns: 1fr; }
    .hero-mark { max-width: 280px; margin: 0 auto; order: -1; }
  }

  @media (prefers-reduced-motion: reduce) {
    * { transition: none !important; }
  }