:root {
      --bg: #FAFAF7;
      --bg-card: #FFFFFF;
      --bg-strip: #F2F2EE;
      --bg-tint: #EDF1F0;
      --ink: #0F1419;
      --ink-2: #2D343C;
      --ink-3: #5C6770;
      --ink-4: #9CA5AE;
      --teal: #1B5B5C;
      --teal-2: #2A7878;
      --teal-3: #0E3939;
      --bronze: #8A6A3D;
      --bronze-2: #B0884C;
      --signal: #C2563D;
      --line: rgba(15, 20, 25, 0.10);
      --line-2: rgba(15, 20, 25, 0.20);
      --line-strong: rgba(15, 20, 25, 0.4);

      --sans: "Geist", -apple-system, BlinkMacSystemFont, "Inter", sans-serif;
      --mono: "Geist Mono", "SF Mono", monospace;
    }

    [data-theme="dark"] {
      --bg: #0A0F14;
      --bg-card: #121821;
      --bg-strip: #161D26;
      --bg-tint: #122027;
      --ink: #ECEFF3;
      --ink-2: #BCC2CB;
      --ink-3: #7C848F;
      --ink-4: #4A5260;
      --teal: #5CABA8;
      --teal-2: #7BC4C0;
      --teal-3: #3D8483;
      --bronze: #C49968;
      --bronze-2: #D9B07C;
      --signal: #E07B5F;
      --line: rgba(236, 239, 243, 0.10);
      --line-2: rgba(236, 239, 243, 0.18);
      --line-strong: rgba(236, 239, 243, 0.4);
    }

    *, *::before, *::after { box-sizing: border-box; }
    html {
      background: var(--bg); color: var(--ink);
      font-family: var(--sans);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
      font-feature-settings: "kern", "ss01", "cv11";
      transition: background-color 250ms ease, color 250ms ease;
    }
    body { margin: 0; line-height: 1.5; min-height: 100vh; overflow-x: hidden; }
    a { color: inherit; text-decoration: none; }
    a:focus-visible { outline: 2px solid var(--teal); outline-offset: 4px; border-radius: 4px; }

    .page { max-width: 1320px; margin: 0 auto; padding: 0 clamp(20px, 5vw, 64px); position: relative; }

    /* ─── Header ─────────────────────────── */
    .header {
      display: grid;
      grid-template-columns: auto 1fr auto;
      align-items: center;
      gap: clamp(14px, 2.2vw, 28px);
      padding: 18px 0;
      border-bottom: 1px solid var(--line);
    }
    .brand { display: inline-flex; align-items: flex-end; gap: 10px; color: var(--ink); }
    .brand-sun { width: 30px; height: 30px; color: var(--ink); flex-shrink: 0; }
    /* Two crisp PNG variants rendered from the vector master. The navy wordmark
       is recoloured light for dark mode; swapped by theme, shown bare (no plate). */
    .logo-auto { display: inline-flex; align-items: center; flex-shrink: 0; }
    .logo-auto img { display: block; width: auto; }
    .logo-auto .lg-d { display: none; }
    [data-theme="dark"] .logo-auto .lg-l { display: none; }
    [data-theme="dark"] .logo-auto .lg-d { display: block; }
    .header .brand-mark img { height: 34px; }
    .footer .footer-mark img { height: 22px; }
    .brand-name-wrap {
      display: flex;
      flex-direction: column;
      gap: 3px;
      line-height: 1;
    }
    .brand-name {
      font-family: var(--sans);
      font-weight: 700;
      font-size: 22px;
      letter-spacing: -0.02em;
      line-height: 1;
      color: var(--ink);
    }
    .brand-name sup {
      font-family: var(--mono);
      font-size: 9px; font-weight: 400;
      vertical-align: super;
      color: var(--ink-3);
      letter-spacing: 0; margin-left: 3px;
    }
    .brand-tagline {
      font-family: var(--mono);
      font-size: 9.5px;
      letter-spacing: 0.04em;
      color: var(--ink-3);
      text-transform: uppercase;
      line-height: 1.2;
    }
    .brand-tagline strong {
      color: var(--teal);
      font-weight: 500;
    }
    @media (max-width: 640px) {
      .brand-tagline { display: none; }
    }

    .nav { list-style: none; padding: 0; margin: 0; display: flex; justify-content: center; gap: clamp(10px, 1.4vw, 22px); }
    .nav a {
      font-family: var(--sans);
      font-size: 13px; font-weight: 500;
      color: var(--ink-2);
      padding: 8px 2px;
      border-bottom: 1.5px solid transparent;
      transition: border-color 150ms, color 150ms;
      letter-spacing: -0.005em;
      white-space: nowrap;
    }
    .nav a:hover { color: var(--ink); border-bottom-color: var(--ink); }
    .nav a.is-active { color: var(--ink); border-bottom-color: var(--teal); }

    .header-aux {
      display: inline-flex; align-items: center; gap: 12px;
      font-family: var(--mono);
      font-size: 11px;
      color: var(--ink-3);
    }
    .header-aux a {
      color: var(--ink-2);
      padding: 5px 10px;
      border: 1px solid transparent;
      border-radius: 4px;
      transition: border-color 150ms, color 150ms;
    }
    .header-aux a:hover { color: var(--ink); border-color: var(--line-2); }
    .theme-toggle {
      background: transparent;
      border: 1px solid var(--line-2);
      width: 30px; height: 30px;
      cursor: pointer;
      color: var(--ink-2);
      border-radius: 4px;
      display: inline-flex; align-items: center; justify-content: center;
      padding: 0;
      transition: border-color 150ms, color 150ms;
    }
    .theme-toggle:hover { color: var(--ink); border-color: var(--ink); }
    .theme-toggle svg { width: 14px; height: 14px; }
    .theme-toggle .icon-moon { display: none; }
    [data-theme="dark"] .theme-toggle .icon-sun { display: none; }
    [data-theme="dark"] .theme-toggle .icon-moon { display: block; }

    /* ─── Hero — photo + spec strip ──── */
    .hero {
      padding: clamp(40px, 7vh, 96px) 0 clamp(32px, 5vh, 72px);
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
      gap: clamp(28px, 4vw, 64px);
      align-items: stretch;
      position: relative;
    }
    .hero-text {
      display: flex; flex-direction: column; justify-content: center;
    }

    .hero-tag {
      display: inline-flex; align-items: center; gap: 8px;
      font-family: var(--mono);
      font-size: 10.5px;
      color: var(--teal);
      background: var(--bg-tint);
      padding: 6px 12px;
      border: 1px solid var(--teal);
      border-radius: 999px;
      margin-bottom: 28px;
      align-self: flex-start;
    }
    .hero-tag::before {
      content: ""; width: 6px; height: 6px;
      background: var(--teal); border-radius: 50%;
      animation: pulse 2s ease-in-out infinite;
    }
    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.4; }
    }

    .hero-headline {
      font-family: var(--sans);
      font-weight: 500;
      font-size: clamp(40px, 5.6vw, 76px);
      line-height: 1.0;
      letter-spacing: -0.035em;
      color: var(--ink);
      margin: 0 0 22px;
      text-wrap: balance;
    }
    .hero-headline span.accent { color: var(--teal); }

    .hero-sub {
      font-size: clamp(15px, 0.85vw + 10px, 18px);
      line-height: 1.55;
      color: var(--ink-2);
      max-width: 50ch;
      margin: 0 0 28px;
      font-weight: 400;
    }

    .hero-chips {
      display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 32px;
    }
    .chip {
      font-family: var(--mono);
      font-size: 10.5px;
      color: var(--ink); padding: 5px 11px 5px 10px;
      background: var(--bg-card);
      border: 1px solid var(--line-2);
      border-radius: 4px;
      font-weight: 500;
      display: inline-flex; align-items: center; gap: 6px;
    }
    .chip::before {
      content: ""; width: 6px; height: 6px;
      border-radius: 50%; flex-shrink: 0;
    }
    .chip.heat::before { background: var(--bronze); }
    .chip.renew::before { background: var(--teal); }
    .chip.cycle::before { background: var(--teal-2); }
    .chip-label {
      font-family: var(--mono);
      color: var(--ink-3);
      font-size: 9px;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      margin-right: 3px;
    }

    .cta-row { display: inline-flex; flex-wrap: wrap; gap: 10px; align-items: center; }
    .btn {
      font-family: var(--sans);
      font-size: 14px; font-weight: 500;
      letter-spacing: -0.005em;
      padding: 12px 20px;
      border-radius: 6px;
      border: 1px solid var(--ink);
      cursor: pointer;
      display: inline-flex; align-items: center; gap: 8px;
      transition: background 180ms, color 180ms, border-color 180ms, transform 200ms;
      line-height: 1;
    }
    /* Light mode: primary button uses the dark green (teal) accent, not black */
    .btn-primary { background: var(--teal); color: #FAFAF7; border-color: var(--teal); }
    .btn-primary:hover { background: var(--teal-3); border-color: var(--teal-3); transform: translateY(-1px); }
    /* Dark mode: keep the original light button with teal hover */
    [data-theme="dark"] .btn-primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
    [data-theme="dark"] .btn-primary:hover { background: var(--teal); border-color: var(--teal); }
    .btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
    .btn-ghost:hover { border-color: var(--ink); }
    .btn .arrow { font-family: var(--mono); font-weight: 400; transition: transform 150ms; }
    .btn:hover .arrow { transform: translateX(2px); }

    /* Hero photo */
    .hero-photo {
      position: relative;
      overflow: hidden;
      background: var(--bg-tint);
      min-height: 460px;
      border-radius: 8px;
      border: 1px solid var(--line);
    }
    .hero-photo img {
      position: absolute; inset: 0;
      width: 100%; height: 100%;
      object-fit: cover; display: block;
    }
    .hero-photo::after {
      content: "";
      position: absolute; inset: 0;
      background: linear-gradient(160deg, rgba(15, 20, 25, 0) 40%, rgba(15, 20, 25, 0.65) 100%);
    }
    .hero-photo-meta {
      position: absolute;
      top: 18px; left: 18px;
      z-index: 3;
      font-family: var(--mono);
      font-size: 10px;
      color: #FAFAF7;
      background: rgba(15, 20, 25, 0.55);
      backdrop-filter: blur(6px);
      padding: 5px 10px;
      border-radius: 4px;
      letter-spacing: 0;
    }
    .hero-photo-meta::before {
      content: "● ";
      color: #5CABA8;
      font-size: 8px;
    }
    .hero-photo-caption {
      position: absolute;
      left: 22px; bottom: 22px; right: 22px;
      z-index: 2;
      color: #FAFAF7;
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.04em;
      display: flex; justify-content: space-between; gap: 16px;
      align-items: flex-end;
    }
    .hero-photo-caption .place {
      font-family: var(--sans);
      font-weight: 500;
      font-size: 16px;
      letter-spacing: -0.015em;
      color: #FFF;
      text-transform: none;
    }

    /* ─── Section headers (bigger, no // prefix) ── */
    .section-eyebrow {
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--teal);
      margin: 0 0 14px;
      display: inline-flex;
      align-items: center;
      gap: 12px;
    }
    .section-eyebrow::before {
      content: "";
      width: 32px; height: 1px;
      background: var(--teal);
    }
    .section-title {
      font-family: var(--sans);
      font-size: clamp(30px, 2.6vw + 10px, 46px);
      line-height: 1.04;
      letter-spacing: -0.028em;
      margin: 0 0 18px;
      color: var(--ink);
      font-weight: 500;
      text-wrap: balance;
    }
    .section-title span.accent { color: var(--teal); }

    /* ─── Tech intro ────────────────────── */
    .tech-intro {
      padding: clamp(56px, 8vh, 96px) 0;
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
      gap: clamp(28px, 4vw, 64px);
      align-items: center;
    }
    .tech-text { display: flex; flex-direction: column; }
    .tech-body {
      font-size: 15px; line-height: 1.6;
      color: var(--ink-2); max-width: 56ch;
    }
    .tech-body p { margin: 0 0 14px; }
    .tech-body p:last-child { margin: 0; }
    .tech-body strong { color: var(--ink); font-weight: 600; }

    .tech-diagram {
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 18px 20px;
      display: flex; flex-direction: column;
    }
    .tech-diagram svg.diagram {
      width: 100%; height: auto;
      max-height: 420px;
    }
    .tech-diagram-caption {
      margin-top: 12px;
      padding-top: 10px;
      border-top: 1px solid var(--line);
      font-family: var(--mono);
      font-size: 10px;
      letter-spacing: 0;
      color: var(--ink-3);
      display: flex;
      justify-content: space-between;
      gap: 8px;
    }
    .tech-diagram-caption strong { color: var(--teal); font-weight: 500; }

    /* ─── Thermal stability (chart left, text right) ── */
    .thermal {
      padding: clamp(56px, 8vh, 96px) 0;
      border-bottom: 1px solid var(--line);
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
      gap: clamp(28px, 4vw, 64px);
      align-items: start;
    }
    .thermal-text { display: flex; flex-direction: column; }
    .thermal-body {
      font-size: 15px;
      line-height: 1.6;
      color: var(--ink-2);
      max-width: 56ch;
    }
    .thermal-body p { margin: 0 0 14px; }
    .thermal-body p:last-child { margin: 0; }
    .thermal-body strong { color: var(--ink); font-weight: 600; }

    .thermal-chart {
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 18px 20px;
    }
    .thermal-chart svg { width: 100%; height: auto; max-height: 280px; }
    .thermal-chart-caption {
      margin-top: 12px;
      padding-top: 10px;
      border-top: 1px solid var(--line);
      font-family: var(--mono);
      font-size: 10px;
      color: var(--ink-3);
      display: flex;
      justify-content: space-between;
      gap: 8px;
    }
    .thermal-chart-caption strong { color: var(--teal); font-weight: 500; }

    /* ─── Pillars ──────────────────────── */
    .pillars { padding: clamp(56px, 8vh, 96px) 0; }
    .pillars-head {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
      gap: clamp(24px, 4vw, 72px);
      align-items: end;
      margin-bottom: clamp(32px, 5vh, 48px);
    }
    .pillars-intro {
      font-size: 15px; line-height: 1.55;
      color: var(--ink-2); max-width: 54ch; margin: 0;
    }
    .pillar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }
    .pillar {
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 0;
      display: grid;
      grid-template-rows: 130px auto auto 1fr auto auto;
      transition: border-color 200ms, transform 200ms, box-shadow 200ms;
      color: inherit;
      position: relative;
      overflow: hidden;
    }
    .pillar::before {
      content: "";
      position: absolute;
      top: 0; left: 0; right: 0;
      height: 2px;
      background: var(--teal);
      transform: translateY(-2px);
      transition: transform 200ms;
      z-index: 2;
    }
    .pillar:hover {
      border-color: var(--ink-2);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px -8px rgba(15, 20, 25, 0.12);
    }
    .pillar:hover::before { transform: translateY(0); }
    .pillar-img {
      position: relative;
      overflow: hidden;
      background: var(--bg-tint);
      border-bottom: 1px solid var(--line);
    }
    .pillar-img svg { display: block; width: 100%; height: 100%; }
    .pillar-tag {
      font-family: var(--mono);
      font-size: 10px;
      color: var(--teal);
      background: var(--bg-tint);
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      letter-spacing: 0;
      margin: 16px 16px 0 16px;
    }
    .pillar-flag {
      font-family: var(--mono);
      font-size: 9.5px;
      letter-spacing: 0;
      color: var(--teal);
      background: var(--bg-tint);
      border: 1px solid color-mix(in srgb, var(--teal) 32%, transparent);
      padding: 3px 9px;
      border-radius: 4px;
      align-self: flex-start;
      display: inline-block;
      margin: 0 20px 14px;
    }
    .pillar-flag strong { color: var(--teal); font-weight: 600; }
    .pillar-meta {
      font-family: var(--mono);
      font-size: 10px;
      color: var(--ink-3);
      padding: 8px 20px 0;
    }
    .pillar-name {
      font-family: var(--sans);
      font-size: clamp(20px, 1.2vw + 12px, 26px);
      line-height: 1.15;
      letter-spacing: -0.022em;
      margin: 18px 20px 8px;
      font-weight: 600;
      color: var(--ink);
    }
    .pillar-desc {
      font-size: 13.5px; line-height: 1.5;
      color: var(--ink-2); margin: 0;
      padding: 0 20px;
    }
    .pillar-specs {
      font-family: var(--mono);
      font-size: 10.5px;
      color: var(--ink-3);
      padding: 12px 20px;
      border-top: 1px solid var(--line);
      margin-top: 14px;
    }
    .pillar-specs strong { color: var(--ink); font-weight: 500; }
    .pillar-link {
      display: inline-flex; align-items: center; gap: 6px;
      font-family: var(--mono);
      font-size: 11px;
      color: var(--ink);
      padding: 12px 20px;
      border-top: 1px solid var(--line);
      font-weight: 500;
    }
    .pillar-link .arrow { transition: transform 150ms; }
    .pillar:hover .pillar-link .arrow { transform: translateX(3px); color: var(--teal); }

    /* ─── Field evidence ────────────────── */
    .evidence {
      padding: clamp(56px, 8vh, 96px) 0;
      border-top: 1px solid var(--line);
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
      gap: clamp(32px, 5vw, 80px);
      align-items: start;
    }
    .evidence-body {
      font-size: 15px; line-height: 1.6;
      color: var(--ink-2); max-width: 50ch;
    }
    .evidence-body p { margin: 0 0 12px; }
    .evidence-body strong { color: var(--ink); font-weight: 600; }
    .evidence-cite {
      margin-top: 18px;
      font-family: var(--mono);
      font-size: 11px; color: var(--ink-3);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .evidence-cite::before {
      content: "↳";
      color: var(--teal);
    }
    .evidence-cite a {
      color: var(--ink-2);
      border-bottom: 1px solid var(--line-2);
    }
    .evidence-cite a:hover { border-bottom-color: var(--teal); color: var(--ink); }

    .stats-card {
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 24px 28px;
    }
    .stats-card-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 14px;
      margin-bottom: 14px;
      border-bottom: 1px solid var(--line);
      font-family: var(--mono);
      font-size: 10.5px;
      color: var(--ink-3);
    }
    .stats-card-header .status {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: var(--teal);
    }
    .stats-card-header .status::before {
      content: "";
      width: 6px; height: 6px;
      border-radius: 50%;
      background: var(--teal);
    }
    .stats-row {
      display: grid; grid-template-columns: auto 1fr;
      gap: 16px; align-items: baseline;
      padding: 12px 0;
      border-bottom: 1px solid var(--line);
    }
    .stats-row:last-of-type { border-bottom: none; }
    .stats-big {
      font-family: var(--sans);
      font-size: clamp(36px, 2.4vw + 16px, 52px);
      line-height: 0.95; letter-spacing: -0.03em;
      color: var(--ink);
      font-feature-settings: "tnum";
      font-weight: 500;
    }
    .stats-big sup {
      font-family: var(--mono);
      font-size: 0.3em; vertical-align: 1.4em;
      color: var(--teal); font-weight: 500; margin-left: 4px;
      letter-spacing: 0;
    }
    .stats-desc {
      font-size: 13px; line-height: 1.5; color: var(--ink-2);
    }
    .stats-desc strong { color: var(--ink); font-weight: 600; }

    /* ─── Authority strip ───────────────── */
    .authority {
      padding: clamp(40px, 6vh, 72px) 0;
      background: var(--bg-strip);
      margin: 0 calc(-1 * clamp(20px, 5vw, 64px));
      border-top: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
    }
    .authority-inner {
      max-width: 1320px; margin: 0 auto;
      padding: 0 clamp(20px, 5vw, 64px);
    }
    .authority-head { margin-bottom: clamp(28px, 4.5vh, 48px); }
    .authority-title {
      font-family: var(--sans);
      font-size: clamp(25px, 1.6vw + 14px, 38px);
      line-height: 1.08; letter-spacing: -0.028em;
      margin: 0; color: var(--ink);
      font-weight: 500; text-wrap: balance;
    }
    .authority-title em { font-style: italic; color: var(--teal); }
    .authority-sub { font-size: 15px; color: var(--ink-2); margin: 11px 0 0; }
    .authority-cols {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: clamp(24px, 4vw, 56px);
      align-items: start;
    }
    .authority-col { display: flex; flex-direction: column; gap: clamp(16px, 2.2vh, 24px); }
    .authority-col--book { flex-direction: row; align-items: flex-start; flex-wrap: wrap; gap: clamp(16px, 1.5vw, 22px); }
    .authority-actions { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
    .authority .item .k { font-family: var(--mono); font-size: 10px; color: var(--ink-3); margin: 0 0 3px; }
    .authority .item .v { font-size: 14px; color: var(--ink); margin: 0; line-height: 1.4; }
    .authority .item .v a { color: inherit; border-bottom: 1px solid var(--line-2); }
    .authority .item .v a:hover { border-bottom-color: var(--teal); }
    .authority-cover-link { display: block; align-self: flex-start; }
    .authority-cover {
      width: clamp(82px, 7vw, 104px); height: auto; display: block;
      border-radius: 4px; border: 1px solid var(--line-2);
      box-shadow: 0 10px 26px -12px rgba(15, 20, 25, 0.5);
      transition: transform 200ms;
    }
    .authority-cover-link:hover .authority-cover { transform: translateY(-2px); }
    .authority-download { align-self: flex-start; }
    .authority-link {
      display: inline-flex; align-items: center; gap: 8px; align-self: flex-start;
      font-family: var(--sans); font-weight: 500; font-size: 13px;
      letter-spacing: -0.01em; color: var(--ink-2);
    }
    .authority-link .arrow { font-family: var(--mono); transition: transform 150ms, color 150ms; }
    .authority-link:hover .arrow { transform: translateX(3px); color: var(--teal); }

    /* ─── Contact CTA ───────────────────── */
    .contact {
      padding: clamp(80px, 12vh, 144px) 0 clamp(40px, 6vh, 80px);
      text-align: center;
    }
    .contact-eyebrow {
      font-family: var(--mono);
      font-size: 11px;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--teal);
      margin: 0 0 22px;
      display: inline-block;
    }
    .contact-headline {
      font-family: var(--sans);
      font-size: clamp(38px, 4.6vw, 68px);
      line-height: 1.05; letter-spacing: -0.03em;
      margin: 0 auto 18px; color: var(--ink);
      max-width: 22ch; text-wrap: balance;
      font-weight: 500;
    }
    .contact-headline span.accent { color: var(--teal); }
    .contact-sub {
      font-size: 16px; line-height: 1.5;
      color: var(--ink-2); max-width: 52ch; margin: 0 auto 32px;
    }

    /* ─── Footer ────────────────────────── */
    .footer {
      padding: 28px 0 36px;
      border-top: 1px solid var(--line);
      display: grid;
      grid-template-columns: auto 1fr auto;
      gap: 20px; align-items: center;
      font-family: var(--mono);
      font-size: 10.5px;
      color: var(--ink-3);
    }
    .footer .copy { text-align: center; }
    .footer .legal { display: inline-flex; gap: 14px; }
    .footer .legal a { color: var(--ink-3); }
    .footer .legal a:hover { color: var(--ink); }
    .footer .mark-small {
      display: inline-flex; align-items: center; gap: 6px;
      color: var(--ink);
    }

    /* ─── Responsive ────────────────────── */
    @media (max-width: 1140px) {
      .header { grid-template-columns: auto auto; row-gap: 12px; }
      .nav { order: 3; grid-column: 1 / -1; justify-content: flex-start; flex-wrap: wrap; padding-top: 12px; border-top: 1px dashed var(--line); }
      .hero { grid-template-columns: 1fr; gap: 40px; }
      .hero-photo { min-height: 340px; }
      .tech-intro { grid-template-columns: 1fr; gap: 28px; }
      .thermal { grid-template-columns: 1fr; gap: 28px; }
      .pillars-head { grid-template-columns: 1fr; gap: 14px; align-items: start; }
      .pillar-grid { grid-template-columns: repeat(2, 1fr); }
      .evidence { grid-template-columns: 1fr; gap: 32px; }
      .authority-cols { grid-template-columns: 1fr; gap: 26px; }
    }
    @media (max-width: 640px) {
      .header { padding: 16px 0; }
      .header-aux .nav-utility { display: none; }
      .pillar-grid { grid-template-columns: 1fr; }
      .pillar { grid-template-rows: 160px auto auto 1fr auto auto; }
      .footer { grid-template-columns: 1fr; gap: 14px; text-align: center; }
      .footer .copy, .footer .legal, .footer .mark-small { justify-content: center; }
    }

    /* ════════════════════════════════════════════════════════
       Sub-page (pillar detail) — shared patterns
       ════════════════════════════════════════════════════════ */
    .breadcrumb {
      display: flex; align-items: center; gap: 9px;
      font-family: var(--mono); font-size: 11px; color: var(--ink-3);
      padding: 22px 0 0;
    }
    .breadcrumb a { color: var(--ink-3); border-bottom: 1px solid transparent; }
    .breadcrumb a:hover { color: var(--ink); border-bottom-color: var(--teal); }
    .breadcrumb .sep { color: var(--ink-4); }
    .breadcrumb .current { color: var(--ink-2); }

    /* Sub-page hero (text-led) */
    .subhero {
      padding: clamp(26px, 4.5vh, 52px) 0 clamp(40px, 6vh, 72px);
      border-bottom: 1px solid var(--line);
      display: grid;
      grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
      gap: clamp(28px, 4vw, 60px);
      align-items: center;
    }
    .subhero-text { max-width: 60ch; }
    .subhero-photo { min-height: 400px; height: 100%; }
    .subhero .section-eyebrow { margin-bottom: 18px; }
    .subhero h1 {
      font-family: var(--sans);
      font-weight: 500;
      font-size: clamp(34px, 4vw + 8px, 60px);
      line-height: 1.02; letter-spacing: -0.032em;
      margin: 0 0 22px; color: var(--ink); text-wrap: balance;
    }
    .subhero h1 .accent { color: var(--teal); }
    .subhero-lead {
      font-size: clamp(15px, 0.7vw + 11px, 18px);
      line-height: 1.55; color: var(--ink-2); margin: 0 0 28px;
    }
    .subhero-lead strong { color: var(--ink); font-weight: 600; }
    .subhero .hero-chips { margin-bottom: 30px; }

    /* Why-PDMS split (diagram left, text right) */
    .why-split {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      gap: clamp(28px, 4vw, 60px);
      align-items: center;
      margin-bottom: clamp(28px, 4vh, 44px);
    }
    .why-text .sp-head { margin-bottom: clamp(16px, 2.5vh, 22px); }

    /* Photo + text split (reusable: picture one side, prose the other) */
    .media-split {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
      gap: clamp(28px, 4vw, 56px);
      align-items: center;
    }
    .media-figure {
      margin: 0;
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--line);
      background: var(--bg-tint);
      aspect-ratio: 4 / 3;
    }
    .media-figure img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .media-text .sp-head { margin-bottom: clamp(14px, 2vh, 20px); }
    .media-text .feature-grid { margin-top: clamp(22px, 3.5vh, 36px); }
    @media (max-width: 1040px) {
      .media-split { grid-template-columns: 1fr; gap: 26px; }
      .media-figure { max-height: 360px; }
    }

    /* Sub-hero image gallery (main photo + clickable thumbnail strip) */
    .subhero-gallery { display: flex; flex-direction: column; gap: 10px; }
    .subhero-gallery .gallery-main { min-height: 320px; }
    .gallery-thumbs {
      display: grid;
      grid-auto-flow: column;
      grid-auto-columns: 1fr;
      gap: 10px;
    }
    .gthumb {
      padding: 0; margin: 0;
      border: 1px solid var(--line-2);
      border-radius: 6px;
      overflow: hidden;
      cursor: pointer;
      background: var(--bg-tint);
      aspect-ratio: 4 / 3;
      opacity: 0.6;
      transition: border-color 150ms, opacity 150ms;
    }
    .gthumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .gthumb:hover { opacity: 0.85; }
    .gthumb.is-active { border-color: var(--teal); opacity: 1; }

    /* Swap the two columns of a prose + stats-card split — desktop only */
    @media (min-width: 1141px) { .sp-split.is-swapped .stats-card { order: -1; } }

    /* Generic sub-page section */
    .sp {
      padding: clamp(48px, 7vh, 88px) 0;
      border-bottom: 1px solid var(--line);
    }
    .sp-head { max-width: 60ch; margin-bottom: clamp(24px, 3.5vh, 40px); }
    .sp-head .section-title { margin-bottom: 0; }
    .prose { font-size: 15px; line-height: 1.65; color: var(--ink-2); max-width: 64ch; }
    .prose p { margin: 0 0 14px; }
    .prose p:last-child { margin: 0; }
    .prose strong { color: var(--ink); font-weight: 600; }

    /* Feature grid (advantages) */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 1px;
      background: var(--line);
      border: 1px solid var(--line);
      border-radius: 8px;
      overflow: hidden;
      margin-top: clamp(26px, 4vh, 42px);
    }
    .feature {
      background: var(--bg-card);
      padding: 22px 22px 24px;
      display: flex; flex-direction: column; gap: 7px;
    }
    .feature-num {
      font-family: var(--mono); font-size: 10.5px;
      letter-spacing: 0.03em; color: var(--teal); margin: 0;
    }
    .feature-title {
      font-family: var(--sans); font-weight: 600;
      font-size: 16px; letter-spacing: -0.015em; color: var(--ink); margin: 0;
    }
    .feature-desc { font-size: 13.5px; line-height: 1.5; color: var(--ink-2); margin: 0; }

    /* Comparison table */
    .cmp-wrap {
      margin-top: clamp(8px, 2vh, 18px);
      border: 1px solid var(--line);
      border-radius: 8px; overflow: hidden;
      background: var(--bg-card);
    }
    .cmp-table { width: 100%; border-collapse: collapse; font-size: 14px; }
    .cmp-table thead th {
      font-family: var(--mono); font-size: 10.5px; font-weight: 500;
      letter-spacing: 0.06em; text-transform: uppercase;
      text-align: left; color: var(--ink-3);
      padding: 14px 18px; border-bottom: 1px solid var(--line);
      background: var(--bg-strip);
    }
    .cmp-table thead th.eva { color: var(--signal); }
    .cmp-table thead th.pdms { color: var(--teal); }
    .cmp-table tbody td, .cmp-table tbody th {
      padding: 13px 18px; border-bottom: 1px solid var(--line);
      vertical-align: top; line-height: 1.45; text-align: left;
    }
    .cmp-table tbody tr:last-child td, .cmp-table tbody tr:last-child th { border-bottom: none; }
    .cmp-table tbody th {
      font-family: var(--sans); font-weight: 600; color: var(--ink);
      width: 26%; font-size: 13.5px;
    }
    .cmp-table td.eva { color: var(--ink-2); width: 37%; }
    .cmp-table td.pdms { color: var(--ink); width: 37%; background: color-mix(in srgb, var(--teal) 6%, transparent); }
    .cmp-table td.eva::before { content: "✕ "; color: var(--signal); font-family: var(--mono); font-size: 11px; }
    .cmp-table td.pdms::before { content: "✓ "; color: var(--teal); font-family: var(--mono); font-size: 11px; }
    .cmp-caption {
      font-family: var(--mono); font-size: 10px; color: var(--ink-3);
      padding: 12px 18px; border-top: 1px solid var(--line);
      display: flex; justify-content: space-between; gap: 8px;
    }
    .cmp-caption strong { color: var(--teal); font-weight: 500; }

    /* Split layout (prose + stats card) */
    .sp-split {
      display: grid;
      grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
      gap: clamp(32px, 5vw, 72px);
      align-items: start;
    }

    /* Compact citation strip */
    .cite-strip {
      padding: clamp(26px, 4vh, 40px) 0;
      border-bottom: 1px solid var(--line);
    }
    .cite-strip .evidence-cite { margin-top: 0; }
    .cite-strip .evidence-cite + .evidence-cite { margin-top: 10px; }
    .cite-strip .evidence-cite em { font-style: italic; }

    /* Pull quote (monograph) */
    .pullquote {
      margin: 0;
      padding: clamp(30px, 5vh, 60px) 0;
      border-bottom: 1px solid var(--line);
    }
    .pullquote blockquote {
      margin: 0; max-width: 64ch;
      font-family: var(--sans);
      font-size: clamp(20px, 1.4vw + 12px, 30px);
      line-height: 1.3; letter-spacing: -0.02em;
      color: var(--ink); font-weight: 500; text-wrap: balance;
      border-left: 3px solid var(--teal);
      padding-left: clamp(18px, 2vw, 28px);
    }
    .pullquote cite {
      display: block; margin-top: 16px;
      font-family: var(--mono); font-size: 11px; font-style: normal;
      color: var(--ink-3); letter-spacing: 0.02em;
      padding-left: clamp(18px, 2vw, 28px);
    }

    /* ─── Contact form ──────────────────── */
    .contact-form { max-width: 760px; }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 18px 22px;
      margin-bottom: 24px;
    }
    .form-field { display: flex; flex-direction: column; gap: 7px; }
    .form-field--full { grid-column: 1 / -1; }
    .form-field label {
      font-family: var(--mono); font-size: 11px;
      letter-spacing: 0.04em; text-transform: uppercase; color: var(--ink-3);
    }
    .form-field input,
    .form-field select,
    .form-field textarea {
      font-family: var(--sans); font-size: 15px; color: var(--ink);
      background: var(--bg-card);
      border: 1px solid var(--line-2); border-radius: 6px;
      padding: 11px 13px; width: 100%;
      transition: border-color 150ms;
    }
    .form-field input::placeholder,
    .form-field textarea::placeholder { color: var(--ink-4); }
    .form-field input:focus,
    .form-field select:focus,
    .form-field textarea:focus { outline: none; border-color: var(--teal); }
    .form-field textarea { resize: vertical; min-height: 130px; line-height: 1.55; }
    .form-field .field-validation-error,
    .validation-summary-errors {
      font-family: var(--mono); font-size: 11px; color: var(--signal);
    }
    .validation-summary-errors { margin-bottom: 16px; }
    .validation-summary-errors ul { margin: 0; padding-left: 18px; }
    .form-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
    .form-note { font-family: var(--mono); font-size: 11px; color: var(--ink-3); margin: 0; }

    /* Contact layout: form + details */
    .contact-layout {
      display: grid;
      grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
      gap: clamp(32px, 5vw, 72px);
      align-items: start;
    }
    .contact-layout .contact-form { max-width: none; }
    /* Contact-form honeypot — kept off-screen; bots fill it, humans never see it. */
    .hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
    .contact-details {
      display: flex; flex-direction: column; gap: 22px;
      border-left: 1px solid var(--line);
      padding-left: clamp(24px, 3vw, 44px);
    }
    .contact-detail .k {
      font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em;
      text-transform: uppercase; color: var(--ink-3); margin: 0 0 6px;
    }
    .contact-detail .v { font-size: 15px; line-height: 1.5; color: var(--ink); margin: 0; }
    .contact-detail .v a { color: var(--ink); border-bottom: 1px solid var(--line-2); }
    .contact-detail .v a:hover { border-bottom-color: var(--teal); }
    .contact-profiles {
      list-style: none; margin: 0; padding: 0;
      display: flex; flex-direction: column; gap: 8px;
    }
    .contact-profiles a {
      font-family: var(--sans); font-size: 14px; color: var(--ink-2);
      border-bottom: 1px solid transparent;
    }
    .contact-profiles a:hover { color: var(--teal); }
    @media (max-width: 900px) {
      .contact-layout { grid-template-columns: 1fr; gap: 36px; }
      .contact-details { border-left: none; padding-left: 0; border-top: 1px solid var(--line); padding-top: 28px; }
    }

    /* Confirmation dialog */
    .sent-dialog {
      border: 1px solid var(--line-2); border-radius: 10px;
      padding: clamp(24px, 4vw, 40px); max-width: 460px; width: calc(100% - 40px);
      background: var(--bg-card); color: var(--ink);
      box-shadow: 0 24px 60px -20px rgba(15, 20, 25, 0.5);
    }
    .sent-dialog::backdrop { background: rgba(15, 20, 25, 0.55); backdrop-filter: blur(3px); }
    .sent-dialog-eyebrow {
      font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em;
      text-transform: uppercase; color: var(--teal); margin: 0 0 10px;
    }
    .sent-dialog h3 {
      font-family: var(--sans); font-weight: 600; font-size: 22px;
      letter-spacing: -0.02em; margin: 0 0 12px; color: var(--ink);
    }
    .sent-dialog p { font-size: 14px; line-height: 1.55; color: var(--ink-2); margin: 0 0 10px; }
    .sent-dialog .sent-dialog-note { color: var(--ink-3); margin-bottom: 20px; }
    .sent-dialog strong { color: var(--ink); }

    @media (max-width: 640px) {
      .form-grid { grid-template-columns: 1fr; }
    }

    /* ─── References gallery ────────────── */
    .ref-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }
    .ref-card {
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 8px;
      overflow: hidden;
      transition: border-color 200ms, transform 200ms, box-shadow 200ms;
    }
    .ref-card:hover {
      border-color: var(--ink-2);
      transform: translateY(-2px);
      box-shadow: 0 8px 24px -8px rgba(15, 20, 25, 0.12);
    }
    .ref-card-img { aspect-ratio: 4 / 3; background: var(--bg-tint); overflow: hidden; }
    .ref-card-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
    .ref-card-body { padding: 14px 16px 16px; }
    .ref-card-name {
      font-family: var(--sans); font-weight: 600; font-size: 15.5px;
      letter-spacing: -0.015em; color: var(--ink); margin: 0 0 4px;
    }
    .ref-card-meta {
      font-family: var(--mono); font-size: 11px; color: var(--ink-3); margin: 0;
    }
    @media (max-width: 1140px) { .ref-grid { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 560px) { .ref-grid { grid-template-columns: 1fr; } }

    /* ─── Downloads ─────────────────────── */
    .download-item {
      display: grid;
      grid-template-columns: auto minmax(0, 1fr);
      gap: clamp(20px, 3vw, 40px);
      align-items: start;
      background: var(--bg-card);
      border: 1px solid var(--line);
      border-radius: 10px;
      padding: clamp(20px, 3vw, 32px);
    }
    .download-cover {
      width: 150px; flex-shrink: 0;
      border: 1px solid var(--line);
      border-radius: 4px; overflow: hidden;
      box-shadow: 0 10px 28px -12px rgba(15, 20, 25, 0.35);
    }
    .download-cover img { width: 100%; height: auto; display: block; }
    .download-body { min-width: 0; }
    .download-kicker {
      font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.06em;
      text-transform: uppercase; color: var(--teal); margin: 0 0 8px;
    }
    .download-title {
      font-family: var(--sans); font-weight: 600;
      font-size: clamp(18px, 1vw + 12px, 22px); letter-spacing: -0.02em;
      line-height: 1.2; color: var(--ink); margin: 0 0 10px;
    }
    .download-meta {
      font-family: var(--mono); font-size: 11px; color: var(--ink-3);
      margin: 0 0 14px; line-height: 1.5;
    }
    .download-desc { font-size: 14px; line-height: 1.6; color: var(--ink-2); margin: 0 0 20px; max-width: 60ch; }
    .download-actions { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
    .download-filemeta { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }
    .download-doi { color: var(--ink-3); border-bottom: 1px solid var(--line-2); white-space: nowrap; }
    .download-doi:hover { color: var(--ink); border-bottom-color: var(--teal); }
    @media (max-width: 560px) {
      .download-item { grid-template-columns: 1fr; }
      .download-cover { width: 120px; }
    }

    /* ─── Research: peer-reviewed papers ── */
    .paper-list {
      list-style: none; margin: 0; padding: 0;
      border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
      background: var(--bg-card);
    }
    .paper { padding: 22px 24px; border-bottom: 1px solid var(--line); }
    .paper:last-child { border-bottom: none; }
    .paper-meta {
      font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.05em;
      text-transform: uppercase; color: var(--teal);
      margin: 0 0 9px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap;
    }
    .paper-oa {
      color: var(--bronze); text-transform: none; letter-spacing: 0;
      border: 1px solid color-mix(in srgb, var(--bronze) 40%, transparent);
      border-radius: 3px; padding: 1px 7px; font-size: 9.5px;
    }
    .paper-title {
      font-family: var(--sans); font-weight: 600; font-size: 16.5px;
      line-height: 1.32; letter-spacing: -0.015em; color: var(--ink); margin: 0 0 8px;
    }
    .paper-authors { font-size: 13.5px; color: var(--ink-2); margin: 0 0 9px; }
    .paper-cite { font-family: var(--mono); font-size: 11.5px; color: var(--ink-3); margin: 0; }
    .paper-cite em { font-style: italic; color: var(--ink-2); }
    .paper-cite a { color: var(--ink-2); border-bottom: 1px solid var(--line-2); white-space: nowrap; }
    .paper-cite a:hover { color: var(--ink); border-bottom-color: var(--teal); }

    /* ─── Research: datasheet / report files ── */
    .file-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
    .file-link {
      display: flex; align-items: center; gap: 16px;
      padding: 16px 18px; color: var(--ink);
      background: var(--bg-card); border: 1px solid var(--line); border-radius: 8px;
      transition: border-color 180ms, transform 180ms;
    }
    .file-link:hover { border-color: var(--ink-2); transform: translateY(-1px); }
    .file-ico {
      font-family: var(--mono); font-size: 10.5px; color: var(--teal);
      border: 1px solid var(--line-2); border-radius: 4px; padding: 5px 8px; flex-shrink: 0;
    }
    .file-text { display: flex; flex-direction: column; gap: 3px; flex: 1; min-width: 0; }
    .file-name { font-family: var(--sans); font-weight: 500; font-size: 15px; color: var(--ink); }
    .file-sub { font-family: var(--mono); font-size: 10.5px; color: var(--ink-3); }
    .file-link .arrow { font-family: var(--mono); color: var(--ink-3); transition: transform 150ms, color 150ms; }
    .file-link:hover .arrow { transform: translateY(2px); color: var(--teal); }

    /* ─── Legal pages ───────────────────── */
    .legal-updated {
      font-family: var(--mono); font-size: 11px;
      color: var(--ink-3); margin: 14px 0 0;
    }
    .legal-prose {
      max-width: 70ch; font-size: 15px; line-height: 1.65; color: var(--ink-2);
    }
    .legal-prose h2 {
      font-family: var(--sans); font-weight: 600;
      font-size: 19px; letter-spacing: -0.015em; color: var(--ink);
      margin: 34px 0 10px;
    }
    .legal-prose h2:first-child { margin-top: 0; }
    .legal-prose p { margin: 0 0 12px; }
    .legal-prose ul { margin: 0 0 12px; padding-left: 20px; }
    .legal-prose li { margin: 0 0 6px; }
    .legal-prose strong { color: var(--ink); font-weight: 600; }
    .legal-prose a { color: var(--teal); border-bottom: 1px solid var(--line-2); }
    .legal-prose a:hover { border-bottom-color: var(--teal); }

    @media (max-width: 1140px) {
      .feature-grid { grid-template-columns: repeat(2, 1fr); }
      .sp-split { grid-template-columns: 1fr; gap: 32px; }
      .subhero { grid-template-columns: 1fr; gap: 32px; }
      .subhero-photo { min-height: 300px; }
      .why-split { grid-template-columns: 1fr; gap: 30px; }
      .why-split .why-text { order: -1; }
    }
    @media (max-width: 640px) {
      .feature-grid { grid-template-columns: 1fr; }
      .cmp-table thead { display: none; }
      .cmp-table tbody tr { display: block; border-bottom: 8px solid var(--bg-strip); }
      .cmp-table tbody th { width: auto; display: block; border-bottom: none; padding-bottom: 2px; }
      .cmp-table tbody td { width: auto; display: block; border-bottom: none; padding-top: 2px; }
      .cmp-table tbody td.eva::before { content: "EVA  ✕ "; color: var(--signal); }
      .cmp-table tbody td.pdms::before { content: "PDMS  ✓ "; color: var(--teal); }
      .cmp-table tbody td.pdms { background: transparent; }
    }

    /* ─── Site menu (hamburger) ─────────── */
    .header { position: relative; }
    .header-aux a.is-active { color: var(--ink); border-color: var(--line-2); }
    .menu-toggle {
      background: transparent;
      border: 1px solid var(--line-2);
      width: 30px; height: 30px;
      cursor: pointer;
      color: var(--ink-2);
      border-radius: 4px;
      display: inline-flex; align-items: center; justify-content: center;
      padding: 0;
      transition: border-color 150ms, color 150ms;
    }
    .menu-toggle:hover { color: var(--ink); border-color: var(--ink); }
    .menu-toggle svg { width: 15px; height: 15px; }
    .menu-toggle .icon-close { display: none; }
    .menu-toggle[aria-expanded="true"] { color: var(--ink); border-color: var(--ink); }
    .menu-toggle[aria-expanded="true"] .icon-burger { display: none; }
    .menu-toggle[aria-expanded="true"] .icon-close { display: block; }

    .site-menu {
      position: absolute;
      top: calc(100% + 6px); right: 0;
      z-index: 80;
      min-width: 250px;
      background: var(--bg-card);
      border: 1px solid var(--line-2);
      border-radius: 10px;
      box-shadow: 0 24px 60px -24px rgba(15, 20, 25, 0.45);
      padding: 10px;
    }
    .site-menu a {
      display: block;
      font-family: var(--sans);
      font-size: 14px; font-weight: 500;
      color: var(--ink-2);
      padding: 9px 12px;
      border-radius: 6px;
    }
    .site-menu a:hover { background: var(--bg-tint); color: var(--ink); }
    .site-menu a.is-active { color: var(--teal); }
    .site-menu-label {
      font-family: var(--mono);
      font-size: 9.5px;
      letter-spacing: 0.12em;
      text-transform: uppercase;
      color: var(--ink-4);
      margin: 6px 12px 4px;
    }
    .site-menu-sep { height: 1px; background: var(--line); margin: 8px 4px; }
    .site-menu .menu-primary { display: none; }
    @media (max-width: 640px) {
      .header { grid-template-columns: 1fr auto; }
      .header > nav[aria-label="Primary"] { display: none; } /* primary links move into the site menu */
      .site-menu .menu-primary { display: block; }
      .site-menu { left: 0; right: 0; min-width: 0; }
    }

    /* ─── Original TRAXLE brand logo (footer · about · imprint) ── */
    .logo-plate {
      display: inline-flex; align-items: center; justify-content: center;
      background: #FFFFFF; /* logo artwork has an opaque white ground */
      border: 1px solid var(--line);
      border-radius: 6px;
      padding: 6px 12px;
    }
    .logo-plate img { display: block; height: 30px; width: auto; }
    .logo-plate--lg { padding: 10px 16px; border-radius: 8px; }
    .logo-plate--lg img { height: 46px; }
    /* Contact page: brand mark above the address block in the details column. */
    .contact-details .contact-mark { margin: 0 0 8px; }
    .contact-details .contact-mark img { height: clamp(48px, 5vw, 62px); }
    [data-theme="dark"] .logo-plate { border-color: rgba(236, 239, 243, 0.16); }
    .footer .logo-plate { padding: 4px 9px; }
    .footer .logo-plate img { height: 22px; }
    .card-brand {
      margin-top: 18px; padding-top: 18px;
      border-top: 1px solid var(--line);
      display: flex; align-items: center; gap: 14px;
    }
    .card-brand-note {
      font-family: var(--mono); font-size: 10px; line-height: 1.5;
      color: var(--ink-3); margin: 0; max-width: 26ch;
    }

    /* ════════════════════════════════════════════════════════
       DEFAULT LIGHT LOOK — "PAPER". Applied via data-skin="paper" on
       <html>; scoped with :not([data-theme="dark"]) so dark mode is
       unaffected. (Approved Jun 2026; the off/blueprint variants and the
       reviewer badge were removed once PAPER was chosen.)
       ════════════════════════════════════════════════════════ */
    [data-skin="paper"]:not([data-theme="dark"]) {
      --bg: #F4F0E7;
      --bg-strip: #ECE7D9;
      --bg-tint: #E9EEE7;
      --line: rgba(60, 51, 32, 0.13);
      --line-2: rgba(60, 51, 32, 0.24);
      --line-strong: rgba(60, 51, 32, 0.45);
      background:
        radial-gradient(1100px 540px at 78% -10%, rgba(27, 91, 92, 0.07), transparent 62%),
        radial-gradient(860px 480px at -8% 0%, rgba(176, 136, 76, 0.08), transparent 58%),
        #F4F0E7;
    }
    [data-skin="paper"]:not([data-theme="dark"]) :is(.pillar, .stats-card, .tech-diagram, .thermal-chart, .cmp-wrap, .download-item, .ref-card, .feature-grid) {
      box-shadow: 0 1px 2px rgba(60, 51, 32, 0.05), 0 18px 44px -26px rgba(60, 51, 32, 0.26);
    }
    [data-skin="paper"]:not([data-theme="dark"]) :is(.pillar, .ref-card):hover {
      box-shadow: 0 2px 4px rgba(60, 51, 32, 0.06), 0 26px 56px -24px rgba(60, 51, 32, 0.34);
    }
    [data-skin="paper"]:not([data-theme="dark"]) .hero-photo {
      border-color: var(--line-2);
      box-shadow: 0 28px 64px -30px rgba(60, 51, 32, 0.45);
    }