:root {
  --paper: #e9e7df;
  --paper-soft: #f2f0e9;
  --navy: #14263a;
  --navy-soft: #304153;
  --mustard: #c79a27;
  --forest: #405d4c;
  --line: #b9b8af;
  --white: #fbfaf6;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --serif: Iowan Old Style, Palatino Linotype, Book Antiqua, Palatino, Georgia, serif;
  --step--1: clamp(0.78rem, 0.75rem + 0.14vw, 0.88rem);
  --step-0: clamp(1rem, 0.95rem + 0.2vw, 1.12rem);
  --step-1: clamp(1.18rem, 1.06rem + 0.48vw, 1.48rem);
  --step-2: clamp(1.55rem, 1.3rem + 0.95vw, 2.18rem);
  --step-3: clamp(2.1rem, 1.62rem + 1.75vw, 3.25rem);
  --step-4: clamp(2.75rem, 1.85rem + 3.2vw, 5.05rem);
  --shell: min(1200px, calc(100% - 40px));
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--paper);
  color: var(--navy);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.67;
  text-rendering: optimizeLegibility;
}

img { display: block; max-width: 100%; height: auto; }

a { color: inherit; text-decoration-color: var(--mustard); text-decoration-thickness: 1px; text-underline-offset: 0.22em; }
a:hover { color: var(--forest); }
a:focus-visible { outline: 3px solid var(--mustard); outline-offset: 4px; }

p, ul, ol { margin-top: 0; }
h1, h2, h3 { margin-top: 0; color: var(--navy); }
h1, h2 { font-family: var(--serif); font-weight: 500; letter-spacing: -0.035em; line-height: 1.02; }
h3 { font-size: var(--step-1); line-height: 1.22; }

.shell { width: var(--shell); margin-inline: auto; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  transform: translateY(-180%);
  background: var(--navy);
  color: var(--white);
}
.skip-link:focus { transform: translateY(0); }

.site-header { border-bottom: 1px solid var(--line); }
.header-inner {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}
.brand {
  font-family: var(--serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
}
.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px 25px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: var(--step--1);
}
.nav-list a { text-decoration: none; }
.nav-list a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--mustard); text-underline-offset: 0.5em; }

.eyebrow, .section-index, .footer-label, .edition-note {
  margin-bottom: 1rem;
  color: var(--forest);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.15em;
  line-height: 1.35;
  text-transform: uppercase;
}

.hero { padding-top: clamp(48px, 7vw, 96px); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(280px, 0.72fr);
  gap: clamp(50px, 9vw, 130px);
  align-items: end;
}
.hero h1 { max-width: 9.5ch; margin-bottom: 0; font-size: var(--step-4); }
.hero-intro { max-width: 34rem; padding-bottom: 0.45rem; }
.hero-intro > p:first-child { font-size: var(--step-1); line-height: 1.55; }
.edition-note { margin: 1.7rem 0 0; color: var(--navy-soft); }

.hero-figure {
  position: relative;
  display: grid;
  grid-template-columns: 34px 1fr;
  margin: clamp(44px, 7vw, 90px) 0 0;
}
.hero-figure img {
  width: 100%;
  aspect-ratio: 30 / 13;
  object-fit: cover;
  filter: saturate(0.72) contrast(0.95);
}
.hero-figure figcaption {
  grid-column: 2;
  max-width: 48rem;
  margin-top: 12px;
  color: var(--navy-soft);
  font-size: var(--step--1);
}
.vertical-label {
  align-self: end;
  justify-self: start;
  color: var(--forest);
  font-size: 0.62rem;
  font-weight: 750;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.section { padding-block: clamp(70px, 9vw, 130px); border-top: 1px solid var(--line); }
.hero + #contenu > .section:first-child { margin-top: clamp(70px, 9vw, 130px); }
.section h2 { font-size: var(--step-3); }

.split-intro { display: grid; grid-template-columns: minmax(240px, 0.72fr) minmax(0, 1.28fr); gap: clamp(40px, 8vw, 110px); }
.split-intro h2 { max-width: 10ch; }
.prose-wide { max-width: 49rem; }
.prose-wide p { font-size: var(--step-1); }

.surfaces { display: grid; grid-template-columns: 1.25fr 0.8fr 0.8fr; gap: 0; }
.surface-title { padding-right: clamp(30px, 5vw, 76px); }
.surface-title h2 { max-width: 12ch; }
.surface-column { padding: 8px clamp(24px, 4vw, 56px) 0; border-left: 1px solid var(--line); }
.surface-column::before {
  content: "";
  display: block;
  width: 84px;
  height: 14px;
  margin-bottom: 35px;
  background: repeating-linear-gradient(90deg, currentColor 0 2px, transparent 2px 9px);
  opacity: 0.65;
}
.surface-column.hard { color: var(--mustard); }
.surface-column.soft { color: var(--forest); }
.surface-column p { color: var(--navy); }

.mic-section { display: grid; grid-template-columns: 1.25fr repeat(3, minmax(0, 0.75fr)); gap: clamp(24px, 4vw, 58px); align-items: start; }
.mic-heading h2 { max-width: 12ch; }
.principle { padding-top: 4px; }
.principle-number {
  display: block;
  width: 100%;
  margin-bottom: 28px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--mustard);
  color: var(--forest);
  font-size: 0.78rem;
  font-weight: 750;
}
.principle p { font-size: 0.96rem; }

.detail-layout { display: grid; grid-template-columns: minmax(0, 1.42fr) minmax(260px, 0.58fr); gap: clamp(48px, 10vw, 150px); }
.detail-copy { max-width: 44rem; }
.detail-copy > h2 { max-width: 14ch; }
.detail-copy > p { font-size: var(--step-1); }
.list-note { margin-top: clamp(38px, 6vw, 70px); padding-top: 26px; border-top: 4px solid var(--forest); }
.list-note h3 { max-width: 18ch; }
.lined-list { margin: 0; padding: 0; list-style: none; }
.lined-list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.detail-figure { margin: 82px 0 0; }
.detail-figure img { width: 100%; aspect-ratio: 5 / 7; object-fit: cover; filter: saturate(0.75); }
.detail-figure figcaption { margin-top: 12px; color: var(--navy-soft); font-size: 0.78rem; line-height: 1.55; }

.listening { display: grid; grid-template-columns: minmax(240px, 0.62fr) minmax(0, 1.38fr); gap: clamp(50px, 8vw, 110px); }
.listening-title h2 { max-width: 11ch; }
.prose-columns { columns: 3 210px; column-gap: clamp(28px, 4vw, 55px); column-rule: 1px solid var(--line); }
.prose-columns p { break-inside: avoid; }
.prose-columns.two { columns: 2 280px; }

.practical-grid { display: grid; grid-template-columns: 1.3fr 0.78fr 0.62fr; gap: clamp(32px, 6vw, 90px); align-items: end; }
.practical-main h2 { max-width: 13ch; }
.cable-block, .comfort-block { padding-top: 28px; border-top: 8px solid var(--mustard); }
.comfort-block { border-top-color: var(--forest); }

.vocal-test { display: grid; grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr); gap: clamp(50px, 9vw, 125px); }
.vocal-test h2 { max-width: 10ch; }
.test-copy { max-width: 50rem; }
.test-copy p { font-size: var(--step-1); }

.final-check { display: grid; grid-template-columns: 0.76fr 1.24fr; gap: clamp(48px, 9vw, 130px); }
.check-heading { position: sticky; top: 32px; align-self: start; }
.check-heading h2 { max-width: 10ch; }
.checklist { margin: 0; padding: 0; list-style: none; counter-reset: checks; }
.checklist li {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  font-size: var(--step-1);
}
.checklist span { color: var(--forest); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.12em; }

.contact-band { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(48px, 9vw, 130px); background: var(--mustard); border-top: 0; }
.contact-band::before {
  content: "";
  position: absolute;
  inset: 0 50%;
}
.contact-band h2 { max-width: 11ch; }
.contact-band .section-index { color: var(--navy); }
.email-link { display: inline-block; margin-top: 1rem; font-weight: 700; text-decoration-color: var(--navy); }

.site-footer { padding-block: 55px; background: var(--navy); color: var(--paper-soft); }
.site-footer a { color: inherit; }
.site-footer a:hover { color: #e5bc55; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.82fr 0.88fr; gap: clamp(35px, 7vw, 100px); }
.footer-brand p { margin-top: 14px; color: #c4c9cb; font-size: 0.84rem; }
.footer-label { color: #e5bc55; }
.footer-contact, .footer-nav { font-size: 0.9rem; }
.footer-nav { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; }

.legal-main { min-height: 70vh; }
.page-heading { padding: clamp(70px, 10vw, 145px) 0 clamp(65px, 9vw, 125px); }
.page-heading h1 { max-width: 12ch; margin-bottom: 30px; font-size: var(--step-4); }
.page-lead { max-width: 48rem; font-size: var(--step-1); }

.about-page { padding-bottom: clamp(75px, 10vw, 140px); }
.about-columns { display: grid; grid-template-columns: 1.45fr 0.55fr; gap: clamp(55px, 10vw, 150px); padding-top: 45px; border-top: 1px solid var(--line); }
.about-primary h2 { max-width: 13ch; font-size: var(--step-3); }
.about-primary p { max-width: 50rem; font-size: var(--step-1); }
.about-context { border-top: 7px solid var(--forest); }
.about-context > div { padding: 25px 0 18px; border-bottom: 1px solid var(--line); }
.about-context p:last-child { margin-bottom: 0; }
.about-note { margin-top: clamp(80px, 11vw, 155px); padding-top: 38px; border-top: 1px solid var(--line); }
.about-note h2 { max-width: 16ch; font-size: var(--step-3); }
.about-note .prose-columns { margin-top: 40px; }

.legal-article { padding-bottom: clamp(75px, 10vw, 140px); }
.legal-layout { display: grid; grid-template-columns: 0.5fr 1.5fr; gap: clamp(50px, 9vw, 130px); padding-top: 46px; border-top: 1px solid var(--line); }
.legal-summary { align-self: start; padding-top: 22px; border-top: 7px solid var(--mustard); }
.legal-content { max-width: 52rem; }
.legal-content section { padding-bottom: 42px; margin-bottom: 42px; border-bottom: 1px solid var(--line); }
.legal-content section:last-child { margin-bottom: 0; }
.legal-content h2 { font-size: var(--step-2); }

@media (max-width: 950px) {
  .mic-section { grid-template-columns: 1fr 1fr; }
  .mic-heading { grid-column: 1 / -1; }
  .surfaces { grid-template-columns: 1fr 1fr; }
  .surface-title { grid-column: 1 / -1; padding: 0 0 42px; }
  .surface-column.hard { border-left: 0; padding-left: 0; }
  .practical-grid { grid-template-columns: 1fr 1fr; }
  .practical-main { grid-column: 1 / -1; }
}

@media (max-width: 760px) {
  :root { --shell: min(100% - 28px, 680px); }
  .header-inner { align-items: flex-start; flex-direction: column; gap: 13px; padding-block: 18px; }
  .nav-list { justify-content: flex-start; gap: 8px 18px; }
  .hero-grid, .split-intro, .detail-layout, .listening, .vocal-test, .final-check, .contact-band, .about-columns, .legal-layout { grid-template-columns: 1fr; }
  .hero-grid { gap: 32px; }
  .hero h1 { max-width: 11ch; }
  .hero-intro { max-width: 100%; }
  .hero-figure { grid-template-columns: 22px 1fr; }
  .hero-figure img { min-height: 280px; }
  .vertical-label { font-size: 0.55rem; }
  .section { padding-block: 72px; }
  .prose-wide p, .detail-copy > p, .test-copy p { font-size: var(--step-0); }
  .detail-layout, .listening, .vocal-test, .final-check, .about-columns, .legal-layout { gap: 44px; }
  .detail-figure { width: min(78%, 380px); margin: 0 0 0 auto; }
  .prose-columns { columns: 1; }
  .check-heading { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 520px) {
  .nav-list { font-size: 0.78rem; }
  .surfaces, .mic-section, .practical-grid, .footer-grid { grid-template-columns: 1fr; }
  .surface-column { padding: 28px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .surface-column + .surface-column { margin-top: 34px; }
  .principle { padding-top: 24px; border-top: 1px solid var(--line); }
  .detail-figure { width: 88%; }
  .checklist li { grid-template-columns: 42px 1fr; font-size: 1rem; }
  .footer-brand, .practical-main { grid-column: auto; }
}

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