/* ============================================================
   Immersion Infinite — Design system (Lot 1, site public)
   Palette : immersion profonde (bleu nuit) + cyan diélectrique
   ============================================================ */

:root {
  --bg: #081019;
  --bg-2: #0c1826;
  --surface: #101f31;
  --surface-2: #16283e;
  --border: #22374f;
  --text: #e9f0f6;
  --text-2: #a8bccd;
  --text-3: #7e94a8;
  --accent: #3fd0ee;
  --accent-strong: #6fe0f7;
  --accent-dim: rgba(63, 208, 238, 0.12);
  --ok: #52d99a;
  --warn: #f0b64a;
  --info: #7aa8f0;
  --neutral: #8fa3b5;
  --radius: 12px;
  --radius-sm: 8px;
  --maxw: 1140px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", SFMono-Regular, ui-monospace, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }
[id] { scroll-margin-top: 96px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img, svg { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible, summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--accent-strong);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: #04141c;
  padding: 10px 18px; z-index: 100; font-weight: 600;
  border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(8, 16, 25, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; gap: 18px;
  min-height: 64px; flex-wrap: wrap; padding: 8px 0;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 1.06rem; color: var(--text);
  letter-spacing: 0.02em; white-space: nowrap;
}
.brand:hover { text-decoration: none; }
.brand .infinity {
  color: var(--accent); font-size: 1.5rem; line-height: 1;
  transform: translateY(-1px);
}
.main-nav { display: flex; gap: 2px; flex-wrap: wrap; margin-left: auto; }
.main-nav a {
  color: var(--text-2); padding: 8px 12px; border-radius: 8px;
  font-size: 0.95rem; display: block;
}
.main-nav a:hover { color: var(--text); background: var(--surface); text-decoration: none; }
.main-nav a[aria-current="page"] { color: var(--accent-strong); background: var(--accent-dim); }

/* Menus déroulants */
.nav-item { position: relative; }
.nav-item > a::after {
  content: "▾"; font-size: 0.65em; margin-left: 6px;
  color: var(--text-3); vertical-align: middle;
}
.dropdown {
  display: none; position: absolute; top: 100%; left: 0; z-index: 60;
  min-width: 240px; margin: 4px 0 0; padding: 8px; list-style: none;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.45);
}
.nav-item:hover .dropdown,
.nav-item:focus-within .dropdown { display: block; }
.dropdown li a {
  padding: 9px 12px; font-size: 0.9rem; border-radius: 6px; color: var(--text-2);
}
.dropdown li a:hover { background: var(--accent-dim); color: var(--accent-strong); }

.header-actions { display: flex; align-items: center; gap: 10px; }
.lang-switch {
  display: flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden;
  font-size: 0.85rem;
}
.lang-switch a, .lang-switch span {
  padding: 5px 10px; color: var(--text-3);
}
.lang-switch [aria-current="true"] {
  background: var(--surface-2); color: var(--text); font-weight: 600;
}
.lang-switch a:hover { color: var(--text); text-decoration: none; }

.nav-toggle { display: none; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; padding: 11px 22px; border-radius: 10px;
  font-weight: 600; font-size: 0.97rem; border: 1px solid transparent;
  cursor: pointer; text-align: center;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #04141c; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-secondary { background: transparent; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent-strong); }
.btn-sm { padding: 7px 14px; font-size: 0.88rem; border-radius: 8px; }

/* ---------- Hero ---------- */
.hero {
  padding: 84px 0 64px;
  background:
    radial-gradient(ellipse 900px 420px at 70% -10%, rgba(63, 208, 238, 0.13), transparent),
    radial-gradient(ellipse 600px 400px at 10% 110%, rgba(122, 168, 240, 0.08), transparent);
  border-bottom: 1px solid var(--border);
}
.hero h1 {
  font-size: clamp(1.9rem, 4.2vw, 3.1rem);
  line-height: 1.15; margin: 0 0 18px; letter-spacing: -0.015em;
  max-width: 21ch;
}
.hero h1 .accent { color: var(--accent); }
.hero .lede {
  font-size: 1.16rem; color: var(--text-2); max-width: 62ch; margin: 0 0 30px;
}
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-note { margin-top: 26px; font-size: 0.88rem; color: var(--text-3); max-width: 70ch; }

/* ---------- Sections ---------- */
.section { padding: 64px 0; }
.section-alt { background: var(--bg-2); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 {
  font-size: clamp(1.5rem, 2.8vw, 2.1rem); line-height: 1.2;
  margin: 0 0 10px; letter-spacing: -0.01em;
}
.section .section-intro { color: var(--text-2); max-width: 72ch; margin: 0 0 34px; }
.kicker {
  display: inline-block; font-size: 0.78rem; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 12px;
}

/* ---------- Cards & grids ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
}
.card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--text-2); font-size: 0.94rem; }
.card .card-link { display: inline-block; margin-top: 14px; font-size: 0.9rem; font-weight: 600; }
.card-icon {
  width: 42px; height: 42px; border-radius: 10px;
  background: var(--accent-dim); color: var(--accent);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem; margin-bottom: 14px;
}

/* ---------- Status badges (règle éditoriale : chaque chiffre porte un statut) ---------- */
.badge {
  display: inline-block; padding: 2px 10px; border-radius: 999px;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.05em;
  text-transform: uppercase; vertical-align: middle; white-space: nowrap;
}
.badge-target   { background: rgba(122, 168, 240, 0.15); color: var(--info); border: 1px solid rgba(122,168,240,.35); }
.badge-validate { background: rgba(240, 182, 74, 0.13);  color: var(--warn); border: 1px solid rgba(240,182,74,.35); }
.badge-measured { background: rgba(82, 217, 154, 0.13);  color: var(--ok);   border: 1px solid rgba(82,217,154,.35); }
.badge-legacy   { background: rgba(143, 163, 181, 0.13); color: var(--neutral); border: 1px solid rgba(143,163,181,.3); }
.badge-roadmap  { background: rgba(63, 208, 238, 0.12);  color: var(--accent); border: 1px solid rgba(63,208,238,.3); }

/* ---------- Metric tiles ---------- */
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 18px; }
.metric {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 22px;
}
.metric .value {
  font-size: 2rem; font-weight: 700; color: var(--accent-strong);
  font-family: var(--mono); letter-spacing: -0.02em; line-height: 1.1;
}
.metric .label { color: var(--text-2); font-size: 0.9rem; margin-top: 6px; }
.metric .status { margin-top: 12px; }
.metric .conditions { font-size: 0.78rem; color: var(--text-3); margin-top: 8px; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; min-width: 640px; }
caption { text-align: left; padding: 14px 16px; color: var(--text-3); font-size: 0.85rem; caption-side: bottom; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
thead th { background: var(--surface-2); color: var(--text); font-size: 0.85rem; letter-spacing: 0.04em; text-transform: uppercase; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: rgba(63, 208, 238, 0.04); }
td .sub { display: block; color: var(--text-3); font-size: 0.82rem; margin-top: 3px; }

/* ---------- Progressive disclosure ---------- */
details.disclosure {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 14px;
}
details.disclosure summary {
  cursor: pointer; padding: 18px 22px; font-weight: 600; font-size: 1rem;
  list-style: none; display: flex; align-items: center; gap: 12px;
}
details.disclosure summary::-webkit-details-marker { display: none; }
details.disclosure summary::before {
  content: "+"; color: var(--accent); font-size: 1.25rem; font-weight: 700;
  width: 22px; flex-shrink: 0; text-align: center;
}
details.disclosure[open] summary::before { content: "–"; }
details.disclosure .disclosure-body { padding: 0 22px 20px 56px; color: var(--text-2); font-size: 0.95rem; }
details.disclosure .disclosure-body p:first-child { margin-top: 0; }

/* ---------- Callouts ---------- */
.callout {
  border-left: 4px solid var(--accent); background: var(--surface);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 18px 22px; margin: 26px 0; font-size: 0.94rem; color: var(--text-2);
}
.callout strong { color: var(--text); }
.callout-warn { border-left-color: var(--warn); }
.callout-info { border-left-color: var(--info); }

/* ---------- Timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; position: relative; }
.timeline::before {
  content: ""; position: absolute; left: 8px; top: 8px; bottom: 8px;
  width: 2px; background: var(--border);
}
.timeline li { position: relative; padding: 0 0 30px 40px; }
.timeline li::before {
  content: ""; position: absolute; left: 2px; top: 7px;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--accent);
}
.timeline .tl-date { font-family: var(--mono); font-weight: 700; color: var(--accent-strong); font-size: 0.95rem; }
.timeline h3 { margin: 4px 0 6px; font-size: 1.05rem; }
.timeline p { margin: 0; color: var(--text-2); font-size: 0.93rem; max-width: 70ch; }
.timeline .tl-status { margin-top: 8px; }

/* ---------- Comparison ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 800px) { .compare { grid-template-columns: 1fr; } }
.compare-col {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px;
}
.compare-col.highlight { border-color: rgba(63, 208, 238, 0.45); background: linear-gradient(180deg, rgba(63,208,238,0.06), var(--surface)); }
.compare-col h3 { margin: 0 0 16px; font-size: 1.1rem; }
.compare-col ul { margin: 0; padding: 0; list-style: none; }
.compare-col li { padding: 9px 0 9px 30px; position: relative; color: var(--text-2); font-size: 0.94rem; border-bottom: 1px solid rgba(34,55,79,0.5); }
.compare-col li:last-child { border-bottom: none; }
.compare-col li::before { position: absolute; left: 0; top: 9px; font-weight: 700; }
.compare-col .con::before { content: "✕"; color: var(--warn); }
.compare-col .pro::before { content: "✓"; color: var(--ok); }

/* ---------- Product catalogue ---------- */
.product-card { display: flex; flex-direction: column; }
.product-card .product-photo {
  width: calc(100% + 48px); margin: -24px -24px 18px;
  border-radius: var(--radius) var(--radius) 0 0;
  object-fit: cover; aspect-ratio: 16 / 9; background: #c9d2dc;
}
.media-split { display: grid; grid-template-columns: 1.1fr 1fr; gap: 34px; align-items: center; }
@media (max-width: 860px) { .media-split { grid-template-columns: 1fr; } }
.media-split img { border-radius: var(--radius); border: 1px solid var(--border); width: 100%; }
.figure-note { font-size: 0.85rem; color: var(--text-3); margin-top: 10px; }
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 860px) { .gallery { grid-template-columns: 1fr; } }
.gallery figure { margin: 0; }
.gallery img { border-radius: var(--radius); border: 1px solid var(--border); width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.gallery figcaption { font-size: 0.86rem; color: var(--text-2); margin-top: 10px; }
.product-card .product-name { font-family: var(--mono); font-size: 1.02rem; color: var(--accent-strong); margin: 0 0 4px; }
.product-card .product-segment { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-3); margin-bottom: 10px; }
.product-card p { flex: 1; }
.product-card .product-footer { margin-top: 16px; display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }

/* ---------- Glossary term ---------- */
abbr[title], .term {
  text-decoration: underline dotted var(--accent);
  text-underline-offset: 3px; cursor: help; font-style: normal;
}

/* ---------- Forms (Project Studio demo) ---------- */
.studio-shell { max-width: 780px; margin: 0 auto; }
.studio-progress { display: flex; gap: 6px; margin: 26px 0 8px; }
.studio-progress .seg {
  flex: 1; height: 6px; border-radius: 3px; background: var(--border);
}
.studio-progress .seg.done { background: var(--accent); }
.studio-progress .seg.current { background: var(--accent-strong); }
.studio-progress-label { font-size: 0.85rem; color: var(--text-3); margin-bottom: 22px; }

.studio-step { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; }
.studio-step h2 { font-size: 1.35rem; margin-top: 0; }
.studio-step .why {
  font-size: 0.86rem; color: var(--text-3); background: var(--bg-2);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 10px 14px; margin: 14px 0 22px;
}

fieldset { border: none; margin: 0 0 22px; padding: 0; }
legend, .field-label { font-weight: 600; font-size: 0.97rem; margin-bottom: 10px; display: block; color: var(--text); padding: 0; }
.field-help { font-size: 0.83rem; color: var(--text-3); margin: -6px 0 10px; }

.choice-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
@media (max-width: 620px) { .choice-grid { grid-template-columns: 1fr; } }
.choice {
  position: relative; display: block; border: 1px solid var(--border);
  border-radius: var(--radius-sm); padding: 14px 16px; cursor: pointer;
  background: var(--bg-2); font-size: 0.93rem; color: var(--text-2);
}
.choice:hover { border-color: var(--accent); }
.choice input { position: absolute; opacity: 0; }
.choice input:focus-visible + .choice-label { outline: 3px solid var(--accent-strong); outline-offset: 4px; border-radius: 4px; }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-dim); color: var(--text); }
.choice .choice-label { font-weight: 600; display: block; }
.choice .choice-desc { display: block; font-size: 0.82rem; color: var(--text-3); margin-top: 3px; }

.input-row { display: flex; gap: 14px; flex-wrap: wrap; }
.input-group { flex: 1; min-width: 200px; margin-bottom: 18px; }
.input-group label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; }
input[type="text"], input[type="number"], input[type="email"], select, textarea {
  width: 100%; padding: 11px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-2); color: var(--text);
  font-family: var(--font); font-size: 0.95rem;
}
input::placeholder, textarea::placeholder { color: var(--text-3); }
.unknown-toggle { display: flex; align-items: center; gap: 8px; margin-top: 8px; font-size: 0.83rem; color: var(--text-3); }
.unknown-toggle input { width: auto; accent-color: var(--accent); }

.field-error { color: var(--warn); font-size: 0.85rem; margin-top: 6px; }
.error-summary {
  border: 1px solid var(--warn); border-radius: var(--radius-sm);
  background: rgba(240, 182, 74, 0.08); padding: 16px 20px; margin-bottom: 22px;
}
.error-summary h3 { margin: 0 0 8px; color: var(--warn); font-size: 1rem; }
.error-summary ul { margin: 0; padding-left: 20px; font-size: 0.9rem; }

.studio-nav { display: flex; justify-content: space-between; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.draft-banner {
  display: none; background: var(--accent-dim); border: 1px solid rgba(63,208,238,.35);
  border-radius: var(--radius-sm); padding: 14px 18px; margin-bottom: 22px;
  font-size: 0.92rem; align-items: center; gap: 14px; flex-wrap: wrap;
}
.draft-banner.visible { display: flex; }
.autosave-note { font-size: 0.8rem; color: var(--text-3); margin-top: 14px; text-align: right; }

/* Synthesis */
.synthesis-block { background: var(--bg-2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 20px 24px; margin-bottom: 18px; }
.synthesis-block h3 { margin: 0 0 12px; font-size: 1rem; color: var(--accent-strong); }
.synthesis-block dl { margin: 0; display: grid; grid-template-columns: minmax(140px, 38%) 1fr; gap: 6px 16px; font-size: 0.92rem; }
.synthesis-block dt { color: var(--text-3); }
.synthesis-block dd { margin: 0; color: var(--text); }
.reco-card { border: 1px solid rgba(63,208,238,.4); border-radius: var(--radius-sm); padding: 18px 22px; margin-bottom: 14px; background: linear-gradient(180deg, rgba(63,208,238,0.07), transparent); }
.reco-card h4 { margin: 0 0 6px; font-family: var(--mono); color: var(--accent-strong); }
.reco-card p { margin: 0; font-size: 0.9rem; color: var(--text-2); }
.reco-card .reco-why { margin-top: 10px; font-size: 0.84rem; color: var(--text-3); }

/* ---------- FAQ / Resources ---------- */
.glossary-list dt {
  font-weight: 700; font-family: var(--mono); color: var(--accent-strong);
  margin-top: 18px; font-size: 0.97rem;
}
.glossary-list dd { margin: 4px 0 0; color: var(--text-2); font-size: 0.93rem; max-width: 75ch; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border); background: var(--bg-2);
  padding: 50px 0 36px; margin-top: 60px; font-size: 0.9rem;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 34px; }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.site-footer h4 { margin: 0 0 12px; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--text-3); }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: var(--text-2); }
.site-footer a:hover { color: var(--accent-strong); }
.footer-brand p { color: var(--text-3); max-width: 40ch; font-size: 0.87rem; }
.footer-legal {
  margin-top: 38px; padding-top: 22px; border-top: 1px solid var(--border);
  color: var(--text-3); font-size: 0.8rem; display: flex; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
}

/* ---------- Mobile nav ---------- */
@media (max-width: 900px) {
  .nav-toggle {
    display: block; background: none; border: 1px solid var(--border);
    color: var(--text); border-radius: 8px; padding: 8px 12px; cursor: pointer;
    font-size: 0.9rem; margin-left: auto;
  }
  .main-nav {
    display: none; width: 100%; flex-direction: column; margin: 6px 0 10px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 14px; }
  .dropdown {
    display: block; position: static; box-shadow: none; border: none;
    background: transparent; padding: 0 0 6px 18px; min-width: 0; margin: 0;
  }
  .nav-item > a::after { content: ""; }
  .header-actions { margin-left: 0; }
}

/* ---------- Print ---------- */
@media print {
  body { background: #fff; color: #111; }
  .site-header, .site-footer, .hero-ctas, .studio-nav, .nav-toggle { display: none !important; }
}