/* Vigibruit — feuille de style commune FR / EN */
:root {
  --paper: #e9ecea;      /* fond : gris minéral */
  --panel: #fbfcfb;      /* surfaces de mesure */
  --ink: #15191c;
  --ink-2: #4a5258;
  --ink-3: #6d767c;
  --rule: #c5ccc9;
  --signal: #f2c230;     /* jaune signalisation */
  --signal-soft: #f8e7a6;
  --la: #2a78d6;         /* LAeq */
  --la-soft: #86b6ef;    /* L90 (même entité, pondération A) */
  --lc: #eb6834;         /* LCeq */
  --ref: #8b9290;        /* courbe de référence (nuit) */
  --ok: #0f7a3d;
  --err: #b42318;

  --f-display: 'Barlow Condensed', 'Arial Narrow', sans-serif;
  --f-body: 'Barlow', system-ui, sans-serif;
  --f-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --wrap: 1180px;
  --gutter: clamp(16px, 4vw, 40px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 17px/1.55 var(--f-body);
  font-feature-settings: "tnum" 1;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: 3px solid var(--la); outline-offset: 2px; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.mono { font-family: var(--f-mono); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

h1, h2, h3 { font-family: var(--f-display); font-weight: 600; line-height: 1.02; margin: 0; letter-spacing: -0.005em; }
h1 { font-size: clamp(44px, 7.2vw, 92px); text-transform: uppercase; }
h2 { font-size: clamp(34px, 4.6vw, 56px); text-transform: uppercase; }
h3 { font-size: 24px; font-weight: 600; }
p { margin: 0 0 1em; }
.lede { font-size: clamp(18px, 1.6vw, 21px); color: var(--ink-2); max-width: 40em; }
.mark { -webkit-box-decoration-break: clone; box-decoration-break: clone; background: linear-gradient(transparent 58%, var(--signal) 58%, var(--signal) 92%, transparent 92%); padding: 0 .08em; }

/* Étiquette de section : encode le contenu (grandeur mesurée / rubrique), pas une numérotation */
.tag {
  display: inline-block; font: 500 13px/1 var(--f-mono); letter-spacing: .04em;
  text-transform: uppercase; color: var(--ink-2);
  border: 1px solid var(--ink-2); padding: 6px 8px; margin-bottom: 20px;
}

/* ---------- Navigation ---------- */
.nav { position: sticky; top: 0; z-index: 20; background: rgba(233,236,234,.94); backdrop-filter: blur(6px); border-bottom: 1px solid var(--rule); }
.nav .wrap { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; }
.brand b { font: 700 26px/1 var(--f-display); text-transform: uppercase; letter-spacing: .02em; }
.brand b i { font-style: normal; background: var(--signal); padding: 0 4px; margin-left: 1px; }
.brand span { font-size: 13px; color: var(--ink-3); }
.nav ul { display: flex; gap: 22px; list-style: none; margin: 0 0 0 auto; padding: 0; }
.nav ul a { text-decoration: none; font-weight: 500; font-size: 15px; color: var(--ink-2); }
.nav ul a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 4px; }
.lang { font: 500 13px var(--f-mono); color: var(--ink-3); }
.lang a { text-decoration: none; padding: 4px; }
.lang a[aria-current] { color: var(--ink); border-bottom: 2px solid var(--signal); }
.btn {
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  font: 600 16px/1 var(--f-body); text-decoration: none;
  background: var(--ink); color: #fff; border: 2px solid var(--ink);
  padding: 13px 18px;
}
.btn:hover { background: #000; }
.btn.alt { background: transparent; color: var(--ink); }
.btn.alt:hover { background: var(--panel); }
.btn.sig { background: var(--signal); color: var(--ink); border-color: var(--signal); }
.btn.sig:hover { background: #e5b320; border-color: #e5b320; }
.nav .btn { padding: 10px 14px; font-size: 15px; }
@media (max-width: 960px) {
  .nav ul { display: none; }
  .lang { margin-left: auto; }
  .brand span { display: none; }
}
@media (max-width: 420px) { .nav .btn { display: none; } }

/* ---------- Hero ---------- */
.hero { padding: clamp(40px, 7vw, 88px) 0 56px; }
.hero h1 { max-width: 11.5em; margin-bottom: 26px; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 44px; }

/* ---------- Panneau de mesure (graphiques) ---------- */
.panel { background: var(--panel); border: 1px solid var(--rule); }
.panel-head {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px;
  padding: 14px 18px; border-bottom: 1px solid var(--rule);
  font: 500 13px/1.4 var(--f-mono); color: var(--ink-2);
}
.panel-head strong { color: var(--ink); font-weight: 600; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 18px; list-style: none; margin: 0; padding: 0; }
.legend li { display: flex; align-items: center; gap: 7px; }
.legend i { width: 18px; height: 0; border-top: 2px solid; display: inline-block; }
.legend i.dash { border-top-style: dashed; }
.legend i.box { height: 10px; border: 0; }
.chart { position: relative; padding: 8px 8px 4px; }
.chart svg { width: 100%; height: auto; overflow: visible; }
.chart text { font: 12px var(--f-mono); fill: var(--ink-3); }
.chart .grid line { stroke: #e3e7e5; }
.chart .axis line { stroke: var(--rule); }
.chart .annot text { fill: var(--ink); font-size: 12.5px; }
.chart .annot .big { font: 600 15px var(--f-mono); }
.readout {
  position: absolute; pointer-events: none; z-index: 2;
  background: var(--ink); color: #fff; padding: 9px 11px;
  font: 12.5px/1.55 var(--f-mono); white-space: nowrap; opacity: 0; transition: opacity .1s;
}
.readout b { font-weight: 600; }
.readout .sw { display: inline-block; width: 10px; height: 2px; vertical-align: middle; margin-right: 6px; }
.panel-foot {
  display: flex; flex-wrap: wrap; gap: 6px 28px; padding: 12px 18px;
  border-top: 1px solid var(--rule); font: 13px/1.45 var(--f-mono); color: var(--ink-2);
}
.panel-foot b { color: var(--ink); font-weight: 600; }
details.table { border-top: 1px solid var(--rule); }
details.table summary { cursor: pointer; padding: 10px 18px; font: 13px var(--f-mono); color: var(--ink-2); }
details.table .scroll { max-height: 260px; overflow: auto; padding: 0 18px 14px; }
details.table table { border-collapse: collapse; font: 12.5px var(--f-mono); }
details.table td, details.table th { padding: 3px 14px 3px 0; text-align: right; }
details.table th { color: var(--ink-3); font-weight: 500; }

/* ---------- Sections ---------- */
section.block h2 { margin-bottom: 20px; }
section.block { padding: clamp(56px, 8vw, 104px) 0; border-top: 1px solid var(--rule); }
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.split > .intro h2 { margin-bottom: 20px; }
@media (max-width: 900px) { .split { grid-template-columns: minmax(0, 1fr); } }

/* Fiche de mesure */
.specs { margin: 0; border-top: 2px solid var(--ink); }
.specs > div { display: grid; grid-template-columns: 10em 1fr; gap: 16px; padding: 13px 0; border-bottom: 1px solid var(--rule); }
.specs dt { font-weight: 600; }
.specs dd { margin: 0; color: var(--ink-2); }
.specs dd .mono { color: var(--ink); font-size: 15px; }
@media (max-width: 560px) { .specs > div { grid-template-columns: 1fr; gap: 2px; } }
.limits { margin-top: 32px; padding: 20px 22px; background: var(--panel); border-left: 6px solid var(--signal); }
.limits h3 { font-size: 21px; margin-bottom: 10px; text-transform: uppercase; }
.limits ul { margin: 0; padding-left: 1.1em; color: var(--ink-2); }
.limits li { margin: 6px 0; }
.figure-note { font-size: 16px; color: var(--ink-2); margin-top: 14px; max-width: 46em; }

/* Alertes */
.rule {
  background: var(--ink); color: #e9ecea; padding: 22px 24px;
  font: 14.5px/1.75 var(--f-mono); overflow-x: auto;
}
.rule .k { color: var(--signal); }
.rule .c { color: #8fa0a8; }
.sms {
  margin-top: 18px; max-width: 30em; background: var(--panel); border: 1px solid var(--rule);
  padding: 14px 16px; font: 14px/1.55 var(--f-mono);
}
.sms small { display: block; color: var(--ink-3); font-size: 12px; margin-bottom: 6px; }
.features { list-style: none; margin: 32px 0 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 0 32px; }
.features li { padding: 14px 0; border-top: 1px solid var(--rule); }
.features b { display: block; margin-bottom: 2px; }
.features span { color: var(--ink-2); font-size: 16px; }
@media (max-width: 640px) { .rule { font-size: 12.5px; padding: 18px; } .features { grid-template-columns: 1fr; } }

/* Déroulé (séquence réelle → numérotée) */
.steps { list-style: none; margin: 40px 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); counter-reset: s; border-top: 2px solid var(--ink); }
.steps li { counter-increment: s; padding: 18px 20px 0 0; }
.steps li::before { content: counter(s); display: block; font: 600 44px/1 var(--f-display); margin-bottom: 10px; }
.steps b { display: block; font-size: 18px; margin-bottom: 6px; }
.steps span { color: var(--ink-2); font-size: 16px; }
@media (max-width: 860px) { .steps { grid-template-columns: repeat(2, minmax(0,1fr)); row-gap: 24px; } }
@media (max-width: 480px) { .steps { grid-template-columns: 1fr; } }

/* Usages */
.uses { margin-top: 40px; display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.use { background: var(--panel); padding: 24px 24px 22px; }
.use h3 { text-transform: uppercase; margin-bottom: 10px; }
.use p { color: var(--ink-2); font-size: 16px; }
.use dl { margin: 14px 0 0; font-size: 15px; }
.use dl div { display: grid; grid-template-columns: 7.5em 1fr; gap: 10px; padding: 7px 0; border-top: 1px dashed var(--rule); }
.use dt { font: 500 12.5px/1.9 var(--f-mono); text-transform: uppercase; color: var(--ink-3); }
.use dd { margin: 0; }
@media (max-width: 760px) { .uses { grid-template-columns: 1fr; } }

/* Réglementation */
.regs { width: 100%; border-collapse: collapse; margin-top: 36px; font-size: 16px; }
.regs th { text-align: left; font: 500 12.5px var(--f-mono); text-transform: uppercase; color: var(--ink-3); padding: 0 16px 10px 0; border-bottom: 2px solid var(--ink); }
.regs td { vertical-align: top; padding: 16px 16px 16px 0; border-bottom: 1px solid var(--rule); color: var(--ink-2); }
.regs td:first-child { color: var(--ink); font-weight: 600; width: 22%; }
.regs td:nth-child(2) { width: 24%; font-size: 15px; }
.regs .mono { color: var(--ink); font-size: 14.5px; }
@media (max-width: 760px) {
  .regs thead { display: none; }
  .regs tr, .regs td { display: block; width: auto !important; }
  .regs td { padding: 4px 0; border: 0; }
  .regs tr { padding: 14px 0; border-bottom: 1px solid var(--rule); }
}
.disclaimer { font-size: 14px; color: var(--ink-3); margin-top: 18px; }

/* Contact */
.contact { background: var(--ink); color: #e9ecea; border-top: 0; }
.contact h2 { color: #fff; }
.contact .lede { color: #b7c0c4; }
.contact .direct { margin-top: 28px; font: 15px/2 var(--f-mono); }
.contact .direct a { color: #fff; text-decoration: none; border-bottom: 1px solid var(--signal); }
form.quote { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 16px; }
form.quote .full { grid-column: 1 / -1; }
form.quote label { display: block; font: 500 13px var(--f-mono); color: #b7c0c4; margin-bottom: 6px; }
form.quote input, form.quote select, form.quote textarea {
  width: 100%; font: 16px var(--f-body); color: var(--ink); background: #fbfcfb;
  border: 2px solid #fbfcfb; padding: 11px 12px; border-radius: 0;
}
form.quote textarea { min-height: 140px; resize: vertical; }
form.quote input:focus, form.quote select:focus, form.quote textarea:focus { outline: none; border-color: var(--signal); }
form.quote .hp { position: absolute; left: -9999px; }
form.quote .status { font: 14px/1.5 var(--f-mono); min-height: 1.5em; }
form.quote .status.ok { color: #7ee2a8; }
form.quote .status.err { color: #ff9b8f; }
form.quote button[disabled] { opacity: .6; cursor: wait; }
@media (max-width: 560px) { form.quote { grid-template-columns: 1fr; } }

/* Pied de page */
footer { background: var(--ink); color: #8fa0a8; border-top: 1px solid #2b3236; padding: 26px 0 34px; font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between; }
footer a { color: #c9d1d4; }

/* Mentions légales */
.legal { padding: clamp(40px, 6vw, 72px) 0 80px; }
.legal .wrap { max-width: 820px; }
.legal h1 { font-size: clamp(40px, 6vw, 64px); margin-bottom: 28px; }
.legal h2 { font-size: 26px; margin: 36px 0 10px; padding-top: 18px; border-top: 1px solid var(--rule); }
.legal p { color: var(--ink-2); }
.legal strong { color: var(--ink); }