:root {
  --ink: #15202b;
  --muted: #5b6876;
  --line: #d7dde4;
  --paper: #f6f8f9;
  --panel: #ffffff;
  --blue: #1069a8;
  --cyan: #21a7b8;
  --red: #d44838;
  --green: #16845b;
  --amber: #c77916;
  --shadow: 0 20px 50px rgba(22, 39, 55, .12);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Calibri, "Segoe UI", Arial, sans-serif;
}

a {
  color: inherit;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px clamp(16px, 4vw, 54px);
  background: rgba(246, 248, 249, .94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1.1rem, 2vw, 1.55rem);
}

.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topbar nav a {
  padding: 9px 12px;
  border: 1px solid transparent;
  border-radius: 8px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
}

.topbar nav a:hover,
.topbar nav a:focus-visible {
  border-color: var(--line);
  background: white;
  color: var(--ink);
}

main {
  overflow: hidden;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(320px, 1.1fr);
  gap: clamp(24px, 5vw, 58px);
  align-items: center;
  min-height: calc(100vh - 76px);
  padding: clamp(28px, 6vw, 80px) clamp(16px, 4vw, 54px) 36px;
  background:
    linear-gradient(120deg, rgba(33, 167, 184, .14), transparent 42%),
    linear-gradient(20deg, rgba(212, 72, 56, .12), transparent 52%),
    #eef3f4;
}

.hero-copy {
  max-width: 760px;
}

.kicker {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h2 {
  margin: 0;
  max-width: 760px;
  font-size: clamp(2.4rem, 6vw, 5.6rem);
  line-height: .98;
}

.hero p {
  max-width: 620px;
  color: var(--muted);
  font-size: clamp(1rem, 1.6vw, 1.18rem);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 11px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
}

.button.primary {
  border-color: var(--blue);
  background: var(--blue);
  color: white;
}

.cycle-card {
  min-width: 0;
  padding: clamp(12px, 2vw, 18px);
  border: 1px solid rgba(21, 32, 43, .12);
  border-radius: 8px;
  background: rgba(255, 255, 255, .78);
  box-shadow: var(--shadow);
}

canvas {
  display: block;
  width: 100%;
  aspect-ratio: 720 / 520;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  color: var(--muted);
  font-size: .92rem;
  font-weight: 700;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend i {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.hot {
  background: var(--red);
}

.cold {
  background: var(--blue);
}

.mix {
  background: var(--cyan);
}

.section {
  padding: 70px clamp(16px, 4vw, 54px);
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.section h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 3rem);
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.module {
  min-height: 230px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.module strong {
  display: block;
  margin-bottom: 12px;
  font-size: 1.08rem;
}

.module p {
  color: var(--muted);
  line-height: 1.55;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.tag-row span {
  padding: 6px 8px;
  border-radius: 999px;
  background: #edf4f7;
  color: #315266;
  font-size: .78rem;
  font-weight: 800;
}

.simulator {
  background: #eaf0f1;
}

.sim-layout,
.diagnostic {
  display: grid;
  grid-template-columns: minmax(280px, .9fr) minmax(320px, 1.1fr);
  gap: 18px;
}

.panel,
.case-card,
.quiz-card,
.choices button {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: white;
  box-shadow: 0 8px 26px rgba(22, 39, 55, .06);
}

.panel,
.case-card,
.quiz-card {
  padding: 22px;
}

label {
  display: block;
  margin: 16px 0 8px;
  color: var(--muted);
  font-weight: 800;
}

label:first-child {
  margin-top: 0;
}

.control-row {
  display: grid;
  grid-template-columns: 1fr 76px;
  gap: 12px;
  align-items: center;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--blue);
}

output {
  color: var(--blue);
  font-weight: 900;
  text-align: right;
}

.readings {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.readings div {
  min-height: 112px;
  padding: 14px;
  border-radius: 8px;
  background: #f3f7f8;
}

.readings span,
.score span {
  display: block;
  color: var(--muted);
  font-size: .82rem;
  font-weight: 800;
}

.readings strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(1.3rem, 2.5vw, 2rem);
}

.readings p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.case-label {
  margin: 0;
  color: var(--blue);
  font-weight: 900;
}

.case-card h3,
.quiz-card h3 {
  margin: 8px 0 14px;
  font-size: clamp(1.35rem, 2.3vw, 2.1rem);
}

.case-card li {
  margin: 9px 0;
  color: var(--muted);
}

.choices,
.answer-list {
  display: grid;
  gap: 10px;
}

.choices button,
.answer-list button {
  width: 100%;
  min-height: 56px;
  padding: 14px;
  color: var(--ink);
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.choices button.correct,
.answer-list button.correct {
  border-color: var(--green);
  background: #eaf7f1;
}

.choices button.wrong,
.answer-list button.wrong {
  border-color: var(--red);
  background: #fff0ee;
}

.quiz {
  background: #f4f2ec;
}

.quiz-card {
  max-width: 920px;
}

.score {
  display: inline-block;
  padding: 10px 12px;
  border-radius: 8px;
  background: #eef5f7;
}

.score strong {
  display: block;
  margin-top: 3px;
  font-size: 1.25rem;
}

.answer-list {
  margin: 18px 0;
}

footer {
  padding: 28px clamp(16px, 4vw, 54px);
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: white;
}

@media (max-width: 980px) {
  .hero,
  .sim-layout,
  .diagnostic {
    grid-template-columns: 1fr;
  }

  .module-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .readings {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    min-height: auto;
  }

  .module-grid {
    grid-template-columns: 1fr;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

/* Charte inerWeb Édu : Trebuchet pour les titres, Calibri pour le texte. */
h1, h2, h3 { font-family: "Trebuchet MS", Calibri, Arial, sans-serif; }