:root {
  color-scheme: dark;
  --bg: #0a0d0f;
  --ink: #f2f7f6;
  --soft: #cedad7;
  --muted: #92a19d;
  --panel: #141a1b;
  --panel-2: #1c2425;
  --line: rgba(181, 211, 204, 0.2);
  --accent: #7ce0d0;
  --amber: #e6bf67;
  --green: #93d58c;
  --violet: #c9a9fb;
  --red: #ec7d73;
  --radius: 8px;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.38);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
input { font: inherit; }
.rail {
  position: fixed;
  inset: 0 0 auto;
  z-index: 10;
  min-height: 66px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px max(16px, calc((100vw - 1280px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(10, 13, 15, 0.9);
  backdrop-filter: blur(16px);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 900;
  letter-spacing: 0.04em;
}
.brand span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(124, 224, 208, 0.52);
  border-radius: var(--radius);
  color: var(--accent);
}
.rail nav {
  display: flex;
  gap: 6px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: thin;
}
.rail nav a, .button {
  min-height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 9px 12px;
  background: rgba(255, 255, 255, 0.035);
  color: var(--soft);
  font-size: 13px;
  font-weight: 780;
}
.rail nav a:hover, .button:hover { border-color: rgba(124, 224, 208, 0.6); text-decoration: none; }
.button.primary { border-color: var(--accent); background: var(--accent); color: #06100e; }
main { padding-top: 66px; }
.hero {
  min-height: calc(100svh - 66px);
  display: flex;
  align-items: end;
  max-width: 1280px;
  margin: 0 auto;
  padding: 34px 20px 30px;
  border: 1px solid var(--line);
  border-radius: 0 0 var(--radius) var(--radius);
  background:
    linear-gradient(90deg, rgba(10, 13, 15, 0.98) 0%, rgba(10, 13, 15, 0.86) 44%, rgba(10, 13, 15, 0.34) 78%),
    url("./img/hero-radioprotection-or-v2.jpg") center / cover no-repeat;
}
.card, .source-card, .fiche, .journey, .learn-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.hero-copy {
  max-width: 760px;
  display: flex;
  flex-direction: column;
  justify-content: end;
  padding: 34px 0;
}
.hero-image {
  display: none;
}
.kicker {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 {
  margin: 0 0 18px;
  font-size: clamp(48px, 7vw, 92px);
  line-height: 0.94;
  letter-spacing: 0;
}
.hero-copy p:not(.kicker), .heading p {
  color: var(--muted);
  font-size: 18px;
}
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 54px 20px;
}
.heading {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(280px, 0.68fr);
  gap: 24px;
  align-items: end;
  margin-bottom: 18px;
}
.heading h2 {
  margin: 0;
  font-size: clamp(30px, 4.8vw, 58px);
  line-height: 1;
}
.journey {
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(7, minmax(130px, 1fr));
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
}
.step {
  min-width: 130px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(255, 255, 255, 0.035);
}
.step b {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin-bottom: 12px;
  border-radius: var(--radius);
  background: rgba(124, 224, 208, 0.15);
  color: var(--accent);
}
.step strong { display: block; margin-bottom: 8px; }
.step span, .muted { color: var(--muted); }
.schema-deck {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.card { padding: 18px; min-height: 230px; }
.card h3 { margin: 0 0 10px; font-size: 22px; }
.card p { color: var(--muted); }
.mini-list { margin: 14px 0 0; padding-left: 18px; color: var(--soft); }
.mini-list li { margin: 6px 0; }
.evidence-deck {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}
.source-card { padding: 14px; }
.source-card header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}
.source-card b { color: var(--ink); }
.barline {
  height: 10px;
  margin-top: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
}
.barline span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--violet));
}
.searchline { margin-bottom: 16px; }
input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #090d0e;
  color: var(--ink);
  padding: 13px;
}
input:focus { outline: 2px solid rgba(124, 224, 208, 0.35); border-color: var(--accent); }
.learning-tools {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-bottom: 16px;
}
.chipbar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: thin;
}
.chipbar button {
  flex: 0 0 auto;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.035);
  color: var(--soft);
  padding: 8px 11px;
  font: inherit;
  font-size: 13px;
  font-weight: 780;
  cursor: pointer;
}
.chipbar button.is-active {
  border-color: var(--accent);
  background: rgba(124, 224, 208, 0.16);
  color: var(--ink);
}
.learning-deck {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}
.learn-card {
  padding: 18px;
  min-height: 460px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.learn-card > header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
}
.learn-card h3 {
  margin: 0;
  font-size: 24px;
  line-height: 1.1;
}
.strong-line {
  margin: 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 720;
}
.learn-card details {
  border-top: 1px solid var(--line);
  padding-top: 9px;
}
.learn-card summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 830;
}
.learn-card details ul {
  margin: 9px 0 0;
  padding-left: 18px;
  color: var(--soft);
}
.learn-card li {
  margin: 6px 0;
}
.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}
.detail-grid h4 {
  margin: 10px 0 0;
  color: var(--soft);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.micro-case {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(255, 255, 255, 0.035);
}
.micro-case p { margin: 6px 0; color: var(--soft); }
.source-strip {
  margin-top: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}
.source-strip a, .source-strip > span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 8px;
  color: var(--soft);
  font-size: 11px;
  max-width: 100%;
}
.source-strip span span, .source-strip a span {
  color: var(--muted);
}
.fiche-deck {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}
.fiche { padding: 16px; }
.fiche h3 { margin: 0 0 8px; }
.fiche p { color: var(--muted); }
.tag {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 9px;
  color: var(--soft);
  font-size: 12px;
}
footer {
  max-width: 1280px;
  margin: 0 auto;
  padding: 26px 20px 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}
@media (max-width: 980px) {
  .heading, .schema-deck, .evidence-deck, .fiche-deck, .learning-deck, .detail-grid { grid-template-columns: minmax(0, 1fr); }
  .hero { min-height: calc(100svh - 66px); }
}
@media (max-width: 700px) {
  html { scroll-padding-top: 112px; }
  .rail { min-height: 104px; align-items: flex-start; flex-wrap: wrap; padding: 8px 12px; }
  .rail nav { order: 3; flex-basis: 100%; width: 100%; }
  main { padding-top: 104px; }
  .hero, .section { padding-left: 12px; padding-right: 12px; }
  .hero {
    background:
      linear-gradient(180deg, rgba(10, 13, 15, 0.98) 0%, rgba(10, 13, 15, 0.76) 60%, rgba(10, 13, 15, 0.48)),
      url("./img/hero-radioprotection-or-v2.jpg") center / cover no-repeat;
  }
  .hero-copy { padding: 22px 0; }
  h1 { font-size: clamp(42px, 13vw, 62px); }
  .actions .button { width: 100%; }
}