:root {
  --ink: #10231f;
  --muted: #61716d;
  --paper: #f4f2eb;
  --card: #fffef9;
  --forest: #0b6b50;
  --forest-dark: #092f26;
  --lime: #b8d64a;
  --line: rgba(16, 35, 31, .14);
  --shadow: 0 24px 70px rgba(7, 38, 30, .13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 5%, rgba(184, 214, 74, .18), transparent 24rem),
    radial-gradient(circle at 93% 38%, rgba(11, 107, 80, .09), transparent 30rem),
    var(--paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button, input { font: inherit; }
button { width: auto; }
.site-header, main, footer { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.site-header {
  min-height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--ink); text-decoration: none; }
.brand img { width: 52px; height: 52px; object-fit: contain; border-radius: 15px; }
.brand span { display: flex; flex-direction: column; line-height: 1.1; }
.brand b { font-size: 19px; letter-spacing: -.02em; }
.brand small { margin-top: 5px; color: var(--muted); font-size: 11px; }
.public-badge {
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .62);
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.intro { padding: 72px 0 50px; display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 54px; align-items: end; }
.eyebrow { margin: 0 0 10px; color: var(--forest); font-size: 11px; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.intro h1 { max-width: 760px; margin: 0; color: var(--ink); text-align: left; font-size: clamp(40px, 6vw, 76px); line-height: .98; letter-spacing: -.055em; }
.lead { max-width: 720px; margin: 25px 0 0; color: var(--muted); font-size: clamp(17px, 2vw, 21px); line-height: 1.55; }
.benefits { display: grid; gap: 0; border-top: 1px solid var(--line); }
.benefits span { display: flex; gap: 16px; align-items: center; padding: 15px 0; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 750; }
.benefits b { color: var(--forest); font-size: 11px; }

.workspace { display: grid; grid-template-columns: minmax(260px, 340px) minmax(0, 1fr); gap: 24px; align-items: start; }
.guide-card, .calculator-card, .legend {
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 254, 249, .9);
  box-shadow: var(--shadow);
}
.guide-card { position: sticky; top: 18px; padding: 31px; }
.guide-card h2, .calculator-title h2, .legend h2 { margin: 0; color: var(--ink); border: 0; padding: 0; text-align: left; letter-spacing: -.035em; }
.guide-card h2 { font-size: 29px; line-height: 1.08; }
.guide-card ol { list-style: none; margin: 30px 0; padding: 0; display: grid; gap: 19px; }
.guide-card li { display: flex; align-items: flex-start; gap: 13px; }
.guide-card li > span { flex: 0 0 29px; height: 29px; display: grid; place-items: center; border-radius: 50%; background: var(--forest-dark); color: white; font-size: 11px; font-weight: 800; }
.guide-card li div { display: flex; flex-direction: column; gap: 4px; }
.guide-card li b { font-size: 14px; }
.guide-card li small { color: var(--muted); line-height: 1.35; }
.try-block { padding: 17px; border-radius: 17px; background: #eef4dc; font-size: 13px; }
.example { display: block; margin-top: 10px; padding: 10px 13px; border: 0; border-radius: 10px; background: var(--forest); color: white; font-weight: 800; cursor: pointer; }
.safety-note { margin: 18px 0 0; color: var(--muted); font-size: 11px; line-height: 1.55; }

.calculator-card { overflow: hidden; background: #0d1715; border-color: rgba(255,255,255,.08); }
.calculator-title { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 25px 29px; color: white; border-bottom: 1px solid rgba(255,255,255,.1); }
.calculator-title .eyebrow { color: var(--lime); }
.calculator-title h2 { color: white; font-size: 30px; }
.ghost-button { padding: 10px 14px; border: 1px solid rgba(255,255,255,.25); border-radius: 999px; background: transparent; color: white; font-size: 12px; font-weight: 800; cursor: pointer; }
.ghost-button:hover { background: rgba(255,255,255,.08); transform: none; }

.calc-wrapper { padding: 20px; border-radius: 0; background: transparent; }
.calc-wrapper .app-container { max-width: none; padding: 0; background: transparent; box-shadow: none; }
.quick-import { padding: 18px; border: 1px solid rgba(255,255,255,.11); border-radius: 17px; background: rgba(255,255,255,.045); }
.quick-import label { margin-bottom: 9px; color: #dbe6e2; font-size: 13px; }
.calc-wrapper .quick-import .grid { margin-bottom: 0; }
.calc-wrapper .import-input { min-height: 48px; border-color: rgba(255,255,255,.2); border-radius: 10px; background: #07100e; }
.result-zone { position: relative; margin: 16px 0 23px; padding: 18px; border: 1px solid rgba(184,214,74,.3); border-radius: 18px; background: linear-gradient(145deg, #07100e, #10251f); }
.result-label { display: block; margin-bottom: 8px; color: var(--lime); font-size: 10px; font-weight: 850; letter-spacing: .13em; text-transform: uppercase; }
.calc-wrapper .screen { min-height: 74px; margin: 0; padding: 16px; border: 1px solid rgba(0,255,0,.18); border-radius: 11px; background: #020604; line-height: 1.45; white-space: pre-wrap; }
.calc-wrapper .warning { margin: 0 0 8px; border-radius: 10px; }
.result-actions { display: flex; gap: 8px; margin-top: 10px; }
.calc-wrapper .result-button { flex: 1; min-height: 43px; border: 1px solid rgba(255,255,255,.14); background: #24322f; font-size: 13px; }
.calc-wrapper .result-button.primary { background: var(--forest); }
.feedback { min-height: 17px; margin: 7px 0 -7px; color: #b9c8c3; font-size: 11px; text-align: center; }

.calc-wrapper h4 { margin-top: 20px; color: #a8b8b3; }
.calc-wrapper .grid { gap: 10px; }
.calc-wrapper button { min-height: 48px; border-radius: 11px; }
.calc-wrapper button:hover { filter: brightness(1.08); transform: none; }
.calc-wrapper button:focus-visible, .example:focus-visible, .ghost-button:focus-visible, a:focus-visible { outline: 3px solid var(--lime); outline-offset: 3px; }
.calc-wrapper .descent { background: #f57c00; }
.misc-actions { display: flex; gap: 10px; }
.misc-actions .btn-free-text { flex: 1; }
.misc-actions #btn-link-upv { flex: 0 0 62px; }
.utility-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 14px; }
.calc-wrapper .utility-actions button { width: 100%; margin: 0; font-size: 13px; }
.utility-actions .btn-action { grid-column: 1 / -1; }

.legend { margin: 25px 0 75px; padding: 30px; display: grid; grid-template-columns: 240px 1fr; gap: 30px; box-shadow: none; }
.legend h2 { font-size: 28px; }
.legend dl { margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.legend dl div { padding: 13px 15px; border: 1px solid var(--line); border-radius: 14px; background: white; }
.legend dt { color: var(--forest); font-weight: 900; }
.legend dd { margin: 3px 0 0; color: var(--muted); font-size: 11px; }

footer { display: flex; justify-content: space-between; gap: 20px; padding: 0 0 calc(28px + env(safe-area-inset-bottom)); color: var(--muted); font-size: 12px; }
footer a { color: var(--forest); font-weight: 800; }

@media (max-width: 850px) {
  .site-header, main, footer { width: min(100% - 24px, 650px); }
  .site-header { min-height: 72px; }
  .brand small, .public-badge { display: none; }
  .intro { padding: 42px 0 30px; grid-template-columns: 1fr; gap: 28px; }
  .intro h1 { font-size: clamp(39px, 12vw, 62px); }
  .workspace { grid-template-columns: 1fr; }
  .guide-card { position: static; padding: 24px; }
  .guide-card ol { grid-template-columns: 1fr; margin: 22px 0; }
  .calculator-title { padding: 21px 18px; }
  .calculator-title h2 { font-size: 25px; }
  .calc-wrapper { padding: 12px; }
  .result-zone { position: sticky; top: 5px; z-index: 20; box-shadow: 0 10px 35px rgba(0,0,0,.35); }
  .legend { grid-template-columns: 1fr; padding: 24px; }
  .legend dl { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 430px) {
  .brand img { width: 44px; height: 44px; }
  .brand b { font-size: 17px; }
  .intro { padding-top: 30px; }
  .intro h1 { font-size: 42px; }
  .lead { font-size: 16px; }
  .benefits span { padding: 12px 0; }
  .guide-card, .calculator-card, .legend { border-radius: 21px; }
  .guide-card { padding: 21px; }
  .calculator-title { align-items: flex-start; }
  .ghost-button { padding: 8px 10px; }
  .quick-import { padding: 12px; }
  .calc-wrapper .grid-import { grid-template-columns: 1fr; }
  .calc-wrapper .grid-import button { width: 100%; }
  .calc-wrapper .grid { gap: 7px; }
  .calc-wrapper button { min-height: 51px; }
  .calc-wrapper .grid-3 { grid-template-columns: 1fr 1fr; }
  .calc-wrapper .grid-3 .btn-link-plus { grid-column: 1 / -1; }
  .result-zone { margin-top: 12px; padding: 13px; }
  .calc-wrapper .screen { min-height: 67px; padding: 13px; font-size: 16px; }
  .utility-actions { grid-template-columns: 1fr; }
  .utility-actions .btn-action { grid-column: auto; }
  footer { flex-direction: column; }
}

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

/* --- Retour vers la vitrine -------------------------------------------------------------
   /grille et /FE sont des pages autonomes, ouvertes depuis la page Decouvrir ou par un lien
   partage. Seul le logo ramenait quelque part, et il menait a l'application : un visiteur
   arrive depuis la vitrine se retrouvait sans porte de sortie visible. Charge par les deux
   pages (grille/index.html inclut aussi /FE/fe.css). */
.header-actions { display: flex; align-items: center; gap: 12px; }
.back-link {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border: 1px solid var(--line); border-radius: 999px;
  background: var(--card); color: var(--ink);
  font-size: 12px; font-weight: 800; text-decoration: none; white-space: nowrap;
  transition: background .18s ease, border-color .18s ease;
}
.back-link:hover { border-color: var(--forest); background: #fff; }
.back-link span { font-size: 14px; line-height: 1; }

/* Sur telephone le bandeau "Referentiel public" et le bouton ne tiennent pas cote a cote :
   le retour est ce qui compte, le bandeau est decoratif. */
@media (max-width: 640px) {
  .public-badge { display: none; }
  .back-link { padding: 8px 13px; }
}