/* ============================================================
   Portfolio de Thomas Patout
   Feuille de style unique, sans dépendance externe.
   ============================================================ */

:root {
  --ink: #16202b;
  --mid: #4a5568;
  --light: #8a94a6;
  --accent: #2b4a7a;
  --accent2: #1a6b5a;
  --soft: #f6f8fb;
  --rule: #e3e8ef;
  --radius: 12px;
  --max: 880px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Barre de navigation ---------- */

.nav {
  border-bottom: 1px solid var(--rule);
  padding: 18px 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.nav .brand { font-weight: 700; font-size: 15px; letter-spacing: -0.2px; color: var(--ink); }
.nav .brand span { color: var(--accent); }

.nav ul { display: flex; gap: 20px; list-style: none; }
.nav ul a { font-size: 14px; color: var(--mid); font-weight: 500; }
.nav ul a:hover { color: var(--accent); text-decoration: none; }

/* ---------- En-tête ---------- */

.hero { padding: 72px 0 56px; }

.hero .eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.4px;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 14px;
}

.hero h1 {
  font-size: clamp(32px, 5vw, 46px);
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero .lede {
  font-size: 19px;
  color: var(--mid);
  max-width: 660px;
}

.hero .lede strong { color: var(--ink); }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.btn {
  display: inline-block;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  border: 1px solid transparent;
}

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #23406a; text-decoration: none; }

.btn-ghost { background: #fff; color: var(--accent); border-color: var(--rule); }
.btn-ghost:hover { background: var(--soft); text-decoration: none; }

/* ---------- Sections ---------- */

section { padding: 8px 0 40px; }

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 10px;
  margin-bottom: 28px;
}

.section-head h2 { font-size: 15px; letter-spacing: 1.2px; text-transform: uppercase; color: var(--accent); }

/* ---------- Cartes de projet ---------- */

.cards { display: grid; gap: 18px; }

.card {
  display: block;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 26px 28px;
  color: inherit;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}

.card:hover {
  border-color: #c7d2e0;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(22, 32, 43, .07);
  text-decoration: none;
}

.card .tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .4px;
  color: var(--accent2);
  background: #e8f5f1;
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.card h3 { font-size: 21px; letter-spacing: -.3px; margin-bottom: 8px; }

.card p { color: var(--mid); font-size: 15.5px; }

.card .result {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--rule);
  font-size: 14px;
  color: var(--mid);
}

.card .result strong { color: var(--accent); }

.card .more { display: inline-block; margin-top: 14px; font-size: 14.5px; font-weight: 600; color: var(--accent); }

/* ---------- Étude de cas ---------- */

.article { padding: 48px 0 72px; }

.back { font-size: 14px; color: var(--light); display: inline-block; margin-bottom: 28px; }
.back:hover { color: var(--accent); text-decoration: none; }

.article h1 { font-size: clamp(28px, 4vw, 38px); line-height: 1.2; letter-spacing: -.8px; margin-bottom: 16px; }

.article .lede { font-size: 18.5px; color: var(--mid); margin-bottom: 20px; max-width: 700px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 40px; }

.tags span {
  font-size: 12.5px;
  font-weight: 500;
  color: var(--mid);
  background: var(--soft);
  border: 1px solid var(--rule);
  padding: 4px 11px;
  border-radius: 20px;
}

.article section { padding: 0 0 42px; }

.article h2 {
  font-size: 22px;
  letter-spacing: -.4px;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.article p + p { margin-top: 14px; }
.article p { color: #2c3843; }

.article ul, .article ol { margin: 14px 0 0 22px; }
.article li { margin-bottom: 9px; color: #2c3843; }
.article li strong { color: var(--ink); }

/* Étapes numérotées */

.steps { list-style: none; margin-left: 0; counter-reset: step; }

.steps li {
  position: relative;
  padding-left: 46px;
  margin-bottom: 20px;
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 1px;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps li b { display: block; color: var(--ink); }

/* Métriques */

.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-top: 8px; }

.metric {
  background: var(--soft);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 20px;
  text-align: center;
}

.metric .value { font-size: 27px; font-weight: 700; color: var(--accent); letter-spacing: -.8px; }
.metric .label { font-size: 13px; color: var(--mid); margin-top: 6px; line-height: 1.35; }

/* Encadré */

.callout {
  background: var(--soft);
  border-left: 3px solid var(--accent2);
  border-radius: 0 8px 8px 0;
  padding: 18px 22px;
  margin-top: 20px;
  font-size: 16px;
  color: var(--mid);
}

.callout strong { color: var(--ink); }

/* Limites / pistes */

.limits { list-style: none; margin-left: 0; }
.limits li { position: relative; padding-left: 22px; }
.limits li::before { content: "→"; position: absolute; left: 0; color: var(--accent2); font-weight: 700; }

/* Pied d'article */

.article .footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
}

/* ---------- Pied de page ---------- */

footer {
  border-top: 1px solid var(--rule);
  padding: 34px 0 46px;
  font-size: 14px;
  color: var(--light);
}

footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer a { color: var(--mid); }

/* ---------- Mobile ---------- */

@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { padding: 48px 0 36px; }
  .nav ul { gap: 14px; }
  .nav ul a { font-size: 13px; }
  .card { padding: 22px; }
  .article { padding: 32px 0 56px; }
}