:root {
  --ink: #121414;
  --graphite: #1a1d1d;
  --graphite-2: #242727;
  --paper: #f1ede3;
  --warm: #ded4c2;
  --amber: #c78a3b;
  --blue: #9fb9c2;
  --muted: #9b9d99;
  --line-dark: rgba(241, 237, 227, 0.18);
  --line-light: rgba(18, 20, 20, 0.24);
  --max: 1500px;
  --pad: clamp(1.25rem, 4vw, 4.5rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-underline-offset: 0.24em; }
a:hover { text-decoration-color: var(--amber); }
a:focus-visible { outline: 2px solid var(--amber); outline-offset: 5px; }
img { display: block; max-width: 100%; height: auto; }
p, h1, h2, ul, ol, figure { margin-top: 0; }
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  background: var(--paper);
  color: var(--ink);
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  width: min(100%, var(--max));
  min-height: 6rem;
  margin: 0 auto;
  padding: 1.2rem var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-bottom: 1px solid var(--line-dark);
}
.brand { text-decoration: none; font-size: 1.05rem; font-weight: 750; letter-spacing: 0.02em; }
.brand span { display: block; color: var(--blue); font-size: 0.58rem; font-weight: 650; letter-spacing: 0.16em; text-transform: uppercase; }
.primary-nav { display: flex; align-items: center; justify-content: flex-end; gap: clamp(0.9rem, 2.6vw, 2.6rem); }
.primary-nav a { color: #d2d0c9; font-size: 0.72rem; letter-spacing: 0.1em; text-decoration: none; text-transform: uppercase; }
.primary-nav a[aria-current="page"] { color: var(--paper); border-bottom: 1px solid var(--amber); }

.eyebrow {
  margin-bottom: 1.15rem;
  color: var(--blue);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.35;
  text-transform: uppercase;
}
.dark-label { color: #596d74; }

.hero {
  width: min(100%, var(--max));
  min-height: 740px;
  margin: 0 auto;
  padding: clamp(4rem, 9vh, 8rem) var(--pad) clamp(4.5rem, 8vw, 7.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(310px, 0.75fr);
  align-items: end;
  gap: clamp(3rem, 8vw, 8.5rem);
}
.hero-copy { align-self: end; max-width: 850px; }
.hero-intro { max-width: 37rem; margin-bottom: clamp(4rem, 9vw, 8rem); color: #b9b7b0; font-size: clamp(0.92rem, 1.35vw, 1.08rem); }
h1 { margin-bottom: 0; font-size: clamp(3.2rem, 7.6vw, 8.2rem); font-weight: 650; letter-spacing: -0.068em; line-height: 0.92; }
.hero-figure { position: relative; align-self: center; margin: 3rem 0 0; padding: 1.5rem 0 0 1.5rem; border-top: 1px solid var(--line-dark); border-left: 1px solid var(--line-dark); }
.hero-figure::before, .hero-figure::after { content: ""; position: absolute; background: var(--blue); opacity: 0.8; }
.hero-figure::before { top: -4px; left: 24%; width: 7px; height: 7px; }
.hero-figure::after { bottom: 3.6rem; left: -4px; width: 7px; height: 7px; }
.hero-figure img { width: 100%; aspect-ratio: 1.56 / 1; object-fit: cover; filter: saturate(0.7) contrast(1.08); }
.hero-figure figcaption, .detail-figure figcaption { margin-top: 0.8rem; color: var(--muted); font-size: 0.66rem; line-height: 1.5; }
.figure-mark { position: absolute; color: var(--blue); font-size: 0.55rem; font-weight: 700; letter-spacing: 0.16em; }
.mark-top { top: -1.6rem; right: 0; }
.mark-side { right: -1.2rem; bottom: 6.2rem; transform: rotate(90deg) translateX(100%); transform-origin: right bottom; }

.section { position: relative; width: 100%; padding: clamp(5.5rem, 10vw, 10rem) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))); }
.light-section, .checklist-section { background: var(--paper); color: var(--ink); }
.dark-section { background: var(--graphite); color: var(--paper); }
.warm-section { background: var(--warm); color: var(--ink); }
.section-heading { max-width: 940px; margin-left: 15%; margin-bottom: clamp(3rem, 6vw, 6rem); }
.section-heading h2, .about-editorial h2, .contact-strip h2, .legal-content h2 {
  margin-bottom: 0;
  font-size: clamp(2.35rem, 5vw, 5.4rem);
  font-weight: 620;
  letter-spacing: -0.055em;
  line-height: 1;
}
.chapter-number {
  position: absolute;
  top: clamp(4rem, 7vw, 7rem);
  left: max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad)));
  color: rgba(18, 20, 20, 0.17);
  font-size: clamp(5rem, 11vw, 11rem);
  font-weight: 730;
  letter-spacing: -0.08em;
  line-height: 0.7;
}
.pale-number { color: rgba(18, 20, 20, 0.1); }
.amber-number { color: rgba(199, 138, 59, 0.35); }
.prose p { margin-bottom: 1.35rem; }
.wide-prose { width: min(760px, 62%); margin-left: 35%; font-size: clamp(1rem, 1.28vw, 1.16rem); }
.opening { display: grid; grid-template-columns: 1.25fr 0.75fr; column-gap: 8vw; }
.opening .section-heading, .opening .wide-prose { grid-column: 1; margin-left: 18%; width: auto; }
.technical-note { grid-column: 2; grid-row: 1 / span 2; align-self: end; padding: 1.4rem 0 0 1.4rem; border-top: 1px solid var(--line-light); border-left: 1px solid var(--line-light); font-size: 0.8rem; }
.technical-note strong { display: block; margin-bottom: 0.8rem; font-size: 0.9rem; }
.technical-note ul { margin-bottom: 0; padding-left: 1.2rem; }
.note-code { display: block; margin-bottom: 2.2rem; color: #5e737b; font-size: 0.6rem; font-weight: 750; letter-spacing: 0.18em; }

.framing-section { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 4vw 9vw; padding-top: 4rem; }
.framing-section .section-heading { grid-column: 1 / -1; }
.narrow-heading { max-width: 790px; }
.offset-prose { grid-column: 1; max-width: 690px; margin-left: 18%; }
.detail-figure { grid-column: 2; width: min(100%, 560px); margin: 5rem 0 0; align-self: center; }
.detail-figure img { filter: saturate(0.68) contrast(1.04); }
.detail-figure figcaption { color: #5f625e; }

.lighting-section { display: grid; grid-template-columns: 1fr 0.27fr; gap: 8vw; }
.lighting-section .section-heading { grid-column: 1; }
.columns-prose { grid-column: 1; columns: 2; column-gap: clamp(2rem, 6vw, 6rem); font-size: clamp(1rem, 1.25vw, 1.14rem); }
.columns-prose p { break-inside: avoid; }
.side-rule-note { grid-column: 2; grid-row: 1 / span 2; align-self: end; padding: 0 0 1rem 1.3rem; border-left: 1px solid var(--blue); color: #b9bbb7; font-size: 0.77rem; }
.side-rule-note .note-code { color: var(--blue); }

.audio-section .section-heading { margin-left: 7%; max-width: 1000px; }
.signal-chain { margin-top: clamp(4rem, 8vw, 7rem); display: grid; grid-template-columns: repeat(5, 1fr); border-top: 1px solid var(--line-light); }
.signal-chain span { min-height: 7rem; padding: 1rem 1.1rem; border-right: 1px solid var(--line-light); font-size: 0.67rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.signal-chain span:last-child { border-right: 0; }

.cable-section { display: grid; grid-template-columns: 1fr 0.42fr; column-gap: 10vw; }
.cable-section .section-heading { grid-column: 1 / -1; }
.cable-note { grid-column: 2; grid-row: 2; }

.coordination-section .section-heading { max-width: 1060px; }
.communication-lines { width: min(900px, 78%); margin: 5rem 0 0 7%; border-top: 1px solid var(--line-dark); }
.communication-lines p { display: grid; grid-template-columns: 8rem 1fr; gap: 1rem; margin: 0; padding: 0.85rem 0; border-bottom: 1px solid var(--line-dark); color: #c5c5bf; font-size: 0.84rem; }
.communication-lines span { color: var(--amber); font-size: 0.62rem; font-weight: 750; letter-spacing: 0.15em; }

.checklist-section { background: #e9e5db; }
.checklist-section .section-heading { margin-left: 22%; }
.final-checklist { width: min(960px, 78%); margin: 0 0 0 22%; padding: 0; list-style: none; border-top: 1px solid var(--line-light); }
.final-checklist li { display: grid; grid-template-columns: 5rem 1fr; gap: 2rem; padding: 1.35rem 0; border-bottom: 1px solid var(--line-light); }
.final-checklist li > span { color: #687d84; font-size: 0.64rem; font-weight: 750; letter-spacing: 0.16em; }
.final-checklist strong { font-size: 1rem; }
.final-checklist p { margin: 0.3rem 0 0; color: #565956; font-size: 0.86rem; }
.closing-note { width: min(630px, 70%); margin: 4rem 0 0 48%; padding-left: 1.2rem; border-left: 2px solid var(--amber); font-size: 0.9rem; }

.site-footer {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 2rem var(--pad);
  display: grid;
  grid-template-columns: 1.45fr 0.85fr 1fr;
  gap: 3rem;
  background: var(--ink);
  color: var(--paper);
  border-top: 1px solid var(--line-dark);
}
.footer-brand strong { display: block; margin-bottom: 0.35rem; font-size: 1rem; }
.footer-brand span { display: block; max-width: 30rem; color: #8f918d; font-size: 0.67rem; }
.footer-contact { padding-left: 1.4rem; border-left: 1px solid var(--line-dark); }
.footer-contact span { display: block; color: var(--blue); font-size: 0.58rem; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; }
.footer-contact a { font-size: 0.78rem; }
.footer-nav { display: flex; flex-wrap: wrap; align-content: start; justify-content: flex-end; gap: 0.45rem 1.1rem; }
.footer-nav a { color: #a8aaa5; font-size: 0.65rem; }
.footer-nav a[aria-current="page"] { color: var(--paper); }

.dossier-page, .legal-page { background: var(--paper); color: var(--ink); }
.dossier-hero {
  min-height: 600px;
  padding: clamp(5rem, 10vw, 9rem) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))) 5rem;
  background: var(--graphite);
  color: var(--paper);
}
.dossier-hero h1 { max-width: 1100px; font-size: clamp(4.5rem, 11vw, 11rem); }
.dossier-lead { width: min(540px, 55%); margin: 5rem 0 0 48%; color: #bcbcb5; font-size: clamp(1rem, 1.5vw, 1.22rem); }
.dossier-grid { padding: clamp(5rem, 10vw, 9rem) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))); display: grid; grid-template-columns: 0.65fr 1.35fr; gap: 12vw; }
.dossier-facts { align-self: start; margin-top: 8rem; border-top: 1px solid var(--line-light); }
.dossier-facts p { margin: 0; padding: 1rem 0; border-bottom: 1px solid var(--line-light); font-size: 0.88rem; }
.dossier-facts span { display: block; color: #667980; font-size: 0.58rem; font-weight: 750; letter-spacing: 0.14em; text-transform: uppercase; }
.dossier-copy { max-width: 740px; }
.dossier-copy h2 { margin-bottom: 3rem; font-size: clamp(2.8rem, 5vw, 5.5rem); letter-spacing: -0.055em; line-height: 1; }
.dossier-copy p { font-size: clamp(1rem, 1.25vw, 1.15rem); }
.about-editorial { padding: clamp(5rem, 9vw, 9rem) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))); display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 9vw; background: var(--warm); }
.about-editorial h2 { max-width: 580px; }
.about-editorial .prose { max-width: 660px; margin-top: 6rem; }
.contact-strip { padding: 5rem max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))); background: var(--graphite); color: var(--paper); }
.contact-strip h2 { margin-bottom: 2rem; }
.contact-strip p:last-child { margin: 0; color: #bbbcb7; }

.legal-hero { min-height: 480px; padding: clamp(5rem, 9vw, 8rem) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))); background: var(--graphite); color: var(--paper); }
.legal-hero h1 { font-size: clamp(4rem, 9vw, 9rem); }
.legal-hero > p:last-child { width: min(600px, 58%); margin: 4rem 0 0 42%; color: #b8b9b4; font-size: 1.05rem; }
.terms-hero { background: #202525; }
.legal-layout { padding: clamp(5rem, 10vw, 10rem) max(var(--pad), calc((100vw - var(--max)) / 2 + var(--pad))); display: grid; grid-template-columns: 0.38fr 1fr; gap: 11vw; }
.legal-index { align-self: start; position: sticky; top: 2rem; display: flex; flex-direction: column; padding: 1.4rem 0 0 1.4rem; border-top: 1px solid var(--line-light); border-left: 1px solid var(--line-light); }
.legal-index span { margin-bottom: 2rem; color: #60757c; font-size: 0.58rem; font-weight: 750; letter-spacing: 0.16em; text-transform: uppercase; }
.legal-index strong { margin-bottom: 0.35rem; font-size: 0.8rem; font-weight: 600; }
.legal-content { max-width: 760px; }
.legal-content section { padding: 0 0 4rem; margin-bottom: 4rem; border-bottom: 1px solid var(--line-light); }
.legal-content section:last-child { margin-bottom: 0; }
.legal-content h2 { margin-bottom: 2rem; font-size: clamp(2rem, 4vw, 4rem); }
.legal-content p { font-size: clamp(1rem, 1.15vw, 1.1rem); }
.numbered-legal h2 { display: flex; gap: 1rem; }
.numbered-legal h2 span { flex: 0 0 auto; padding-top: 0.35rem; color: #617780; font-size: 0.6rem; letter-spacing: 0.15em; }

@media (max-width: 980px) {
  .hero { min-height: auto; grid-template-columns: 1fr 0.62fr; gap: 3rem; }
  .hero-intro { margin-bottom: 4rem; }
  .opening, .framing-section, .lighting-section, .cable-section { grid-template-columns: 1fr; }
  .opening .section-heading, .opening .wide-prose, .section-heading, .wide-prose, .offset-prose { grid-column: 1; margin-left: 16%; width: auto; }
  .technical-note, .detail-figure, .side-rule-note, .cable-note { grid-column: 1; grid-row: auto; width: 52%; margin: 4rem 0 0 48%; }
  .columns-prose { columns: 1; margin-left: 16%; }
  .signal-chain { grid-template-columns: repeat(3, 1fr); }
  .signal-chain span { border-bottom: 1px solid var(--line-light); }
  .dossier-grid { grid-template-columns: 0.7fr 1.3fr; gap: 7vw; }
  .dossier-lead { width: 60%; margin-left: 40%; }
}

@media (max-width: 720px) {
  .site-header { min-height: auto; align-items: flex-start; flex-direction: column; gap: 1rem; }
  .primary-nav { width: 100%; justify-content: flex-start; flex-wrap: wrap; gap: 0.65rem 1.2rem; }
  .hero { padding-top: 4rem; grid-template-columns: 1fr; }
  .hero-copy { display: flex; flex-direction: column; }
  .hero-intro { margin-bottom: 3rem; }
  .hero-figure { width: 78%; margin-left: 22%; }
  .section { padding-top: 6.5rem; padding-bottom: 6rem; }
  .chapter-number { top: 3.2rem; }
  .section-heading, .opening .section-heading, .opening .wide-prose, .wide-prose, .offset-prose, .columns-prose { margin-left: 0; }
  .section-heading { margin-bottom: 3rem; }
  .technical-note, .detail-figure, .side-rule-note, .cable-note { width: 76%; margin-left: 24%; }
  .signal-chain { grid-template-columns: 1fr 1fr; }
  .signal-chain span { min-height: 5.5rem; }
  .communication-lines { width: 100%; margin-left: 0; }
  .communication-lines p { grid-template-columns: 6rem 1fr; }
  .checklist-section .section-heading, .final-checklist { width: 100%; margin-left: 0; }
  .final-checklist li { grid-template-columns: 3rem 1fr; gap: 1rem; }
  .closing-note { width: 85%; margin-left: 15%; }
  .site-footer { grid-template-columns: 1fr; gap: 1.5rem; }
  .footer-contact { padding: 1rem 0 0; border-left: 0; border-top: 1px solid var(--line-dark); }
  .footer-nav { justify-content: flex-start; }
  .dossier-hero { min-height: 520px; }
  .dossier-lead, .legal-hero > p:last-child { width: 82%; margin: 4rem 0 0 18%; }
  .dossier-grid, .about-editorial, .legal-layout { grid-template-columns: 1fr; }
  .dossier-facts { margin-top: 0; width: 75%; }
  .about-editorial .prose { margin-top: 0; }
  .legal-index { position: static; width: 65%; }
}

@media (max-width: 440px) {
  body { font-size: 15px; }
  h1 { font-size: clamp(2.8rem, 15vw, 4.1rem); }
  .hero-figure { width: 92%; margin-left: 8%; }
  .mark-side { display: none; }
  .technical-note, .detail-figure, .side-rule-note, .cable-note { width: 90%; margin-left: 10%; }
  .signal-chain { grid-template-columns: 1fr; }
  .communication-lines p { grid-template-columns: 1fr; gap: 0.25rem; }
  .dossier-hero h1, .legal-hero h1 { font-size: clamp(3.4rem, 19vw, 5rem); }
  .dossier-lead, .legal-hero > p:last-child { width: 92%; margin-left: 8%; }
  .dossier-facts, .legal-index { width: 90%; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}