/* Données Fiables, Décisions Solides — feuille de style V0
   Palette extraite de la couverture du livre (couv_v1.pdf) :
   navy #1c252f · orange #ea6724 · blanc #ffffff */

:root {
  --navy: #1c252f;
  --navy-soft: #29343f;
  --orange: #ea6724;
  --orange-dark: #c85719;
  --white: #ffffff;
  --gray-light: #f4f5f7;
  --gray-border: #e2e5e9;
  --text-muted: #5b6470;
  --text-on-navy-muted: rgba(255, 255, 255, 0.78);
  --max-width: 1120px;
  --radius: 10px;
  --font-head: "Poppins", "Segoe UI", Arial, sans-serif;
  --font-body: "Poppins", "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--navy);
  background: var(--white);
  line-height: 1.6;
  font-size: 17px;
}

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.2;
  margin: 0 0 0.6em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.1rem); }
h3 { font-size: 1.15rem; font-weight: 700; }

p { margin: 0 0 1.1em; }

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

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

.eyebrow {
  color: var(--orange);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.82rem;
  margin-bottom: 0.8em;
  display: block;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--white);
  border-bottom: 1px solid var(--gray-border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--navy);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.logo:hover { text-decoration: none; }
.logo span { color: var(--orange); }

nav.main-nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}

nav.main-nav a {
  color: var(--navy);
  font-weight: 500;
  font-size: 0.95rem;
}
nav.main-nav a:hover { color: var(--orange); text-decoration: none; }
nav.main-nav a.active { color: var(--orange); }

#nav-toggle { display: none; }
.nav-toggle-label { display: none; cursor: pointer; }

@media (max-width: 780px) {
  nav.main-nav {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-border);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
  }
  nav.main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 24px 20px;
  }
  nav.main-nav li { padding: 10px 0; border-bottom: 1px solid var(--gray-border); }
  #nav-toggle:checked ~ nav.main-nav { max-height: 400px; }
  .nav-toggle-label {
    display: block;
    font-size: 1.6rem;
    color: var(--navy);
    line-height: 1;
    padding: 4px 8px;
  }
}

/* ---------- Hero ---------- */

.hero {
  background:
    linear-gradient(100deg, var(--navy) 0%, var(--navy) 42%, rgba(28,37,47,0.72) 56%, rgba(28,37,47,0.25) 78%, rgba(28,37,47,0) 100%),
    url("assets/texture-hero.jpg") right bottom / 55% auto no-repeat,
    var(--navy);
  color: var(--white);
  padding: 90px 0 70px;
}

.hero.hero-compact { padding: 56px 0 46px; }

.hero .wrap { max-width: 640px; position: relative; z-index: 1; }

@media (max-width: 700px) {
  .hero {
    background: var(--navy);
    padding: 60px 0 44px;
  }
}

.hero h1 { color: var(--white); }
.hero .lede {
  font-size: 1.15rem;
  color: var(--text-on-navy-muted);
  max-width: 560px;
}

.btn {
  display: inline-block;
  background: var(--orange);
  color: var(--white);
  font-weight: 700;
  padding: 14px 28px;
  border-radius: 6px;
  margin-top: 10px;
}
.btn:hover { background: var(--orange-dark); text-decoration: none; }
.btn-ghost {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.5);
  color: var(--white);
}
.btn-ghost:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }

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

section { padding: 64px 0; }
section.alt { background: var(--gray-light); }

.section-head { max-width: 680px; margin-bottom: 2.2em; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
@media (max-width: 820px) { .grid-3 { grid-template-columns: 1fr; } }

.card {
  background: var(--white);
  border: 1px solid var(--gray-border);
  border-radius: var(--radius);
  padding: 28px 26px;
}
.card h3 { color: var(--navy); }
.card .tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--orange);
  margin-bottom: 8px;
}
.card ul { margin: 0.8em 0 0; padding-left: 1.1em; }
.card li { margin-bottom: 0.5em; }
.card li::marker { color: var(--orange); }

.offer-card { border-top: 4px solid var(--orange); }
.offer-card dl { margin: 1em 0 0; }
.offer-card dt { font-weight: 700; color: var(--navy); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; margin-top: 1em; }
.offer-card dd { margin: 0.2em 0 0; color: var(--text-muted); }

.two-col {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}
@media (max-width: 820px) { .two-col { grid-template-columns: 1fr; } }

.book-cover {
  width: 100%;
  max-width: 320px;
  border-radius: 4px;
  box-shadow: 0 18px 40px rgba(28, 37, 47, 0.25);
}

.quote-block {
  border-left: 3px solid var(--orange);
  padding-left: 1.2em;
  font-style: italic;
  color: var(--navy);
  font-size: 1.05rem;
}

.cta-band {
  background: var(--navy);
  color: var(--white);
  text-align: center;
  padding: 56px 0;
}
.cta-band h2 { color: var(--white); }
.cta-band p { color: var(--text-on-navy-muted); }

.contact-list { list-style: none; padding: 0; margin: 1.4em 0 0; }
.contact-list li {
  padding: 14px 0;
  border-bottom: 1px solid var(--gray-border);
  display: flex;
  gap: 10px;
}
.contact-list strong { min-width: 130px; color: var(--navy); }

/* ---------- Footer ---------- */

footer.site-footer {
  background: var(--navy);
  color: var(--text-on-navy-muted);
  padding: 40px 0;
  font-size: 0.9rem;
}
footer.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
footer.site-footer a { color: var(--white); }
footer.site-footer nav ul {
  list-style: none;
  display: flex;
  gap: 18px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

.note {
  font-size: 0.85rem;
  color: var(--text-muted);
}