:root {
  --primary: #176d9e;
  --primary-dark: #1f3a6b;
  --accent: #f2b705;
  --text: #1f2933;
  --muted: #5f6b7a;
  --bg: #ffffff;
  --bg-alt: #f3f6f9;
  --radius: 10px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { color: var(--primary); }

.container { width: min(1100px, 100% - 32px); margin-inline: auto; }

/* Boutons */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 24px;
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  font-size: 1rem;
  transition: opacity .2s;
}
.btn:hover { opacity: .9; }
.btn-outline { background: transparent; color: #fff; border-color: #fff; }
.hero .btn:not(.btn-outline), .form .btn { color: var(--primary-dark); }
.btn-small { padding: 6px 16px; color: var(--primary-dark) !important; }

/* En-tête */
.header {
  position: sticky; top: 0; z-index: 10;
  background: #fff;
  box-shadow: 0 1px 8px rgba(0,0,0,.08);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo img { height: 56px; width: auto; display: block; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a { color: var(--primary-dark); text-decoration: none; font-weight: 500; }
.nav-toggle { display: none; background: none; border: 0; color: var(--primary-dark); font-size: 1.6rem; cursor: pointer; }

/* Hero */
.hero {
  background:
    linear-gradient(100deg, rgba(31,58,107,.95) 35%, rgba(23,109,158,.55)),
    url("images/hero.webp") center / cover,
    var(--primary-dark);
  color: #fff;
  padding: 130px 0 120px;
}
.hero-tag { color: var(--accent); font-weight: 600; margin-bottom: 12px; }
.hero h1 { font-size: clamp(1.9rem, 5vw, 3rem); line-height: 1.2; max-width: 750px; }
.hero-sub { margin: 18px 0 32px; max-width: 620px; opacity: .9; font-size: 1.1rem; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* Secteurs */
.sectors { background: var(--accent); color: var(--primary-dark); padding: 22px 0; font-weight: 700; }
.sectors-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; text-align: center; }
.sectors span { margin-right: 8px; }

/* Sections */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
h2 { font-size: 2rem; color: var(--primary); margin-bottom: 24px; }
h2::after { content: ""; display: block; width: 60px; height: 4px; background: var(--accent); margin-top: 8px; }
.section p + p { margin-top: 12px; }

.two-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.two-cols.center { align-items: center; }

/* À propos */
.about-img { width: 100%; max-height: 300px; object-fit: cover; border-radius: var(--radius); }
.values { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 24px; }
.values div { border-left: 4px solid var(--accent); padding: 4px 0 4px 14px; }
.values strong { display: block; color: var(--primary-dark); }
.values span { color: var(--muted); font-size: .95rem; }

/* Services */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: #fff; padding: 28px; border-radius: var(--radius);
  box-shadow: 0 2px 10px rgba(0,0,0,.05);
  border-top: 4px solid var(--primary);
}
.card-icon { font-size: 2rem; margin-bottom: 10px; }
.card h3 { color: var(--primary); margin-bottom: 8px; }
.card p { color: var(--muted); }

/* Projets */
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project { border-radius: var(--radius); overflow: hidden; box-shadow: 0 2px 12px rgba(0,0,0,.08); background: #fff; }
.project img { width: 100%; height: 160px; object-fit: cover; display: block; }
.project-body { padding: 20px; }
.project-tag { font-size: .8rem; font-weight: 700; color: #b58700; text-transform: uppercase; }
.project h3 { margin: 4px 0 8px; color: var(--primary); }
.project p { color: var(--muted); }
.project .project-meta { font-size: .9rem; margin-bottom: 6px; }

/* Contact */
.contact-list { list-style: none; margin: 20px 0; }
.contact-list li { margin-bottom: 10px; }
.map { width: 100%; height: 240px; border: 0; border-radius: var(--radius); }
.form { background: #fff; padding: 28px; border-radius: var(--radius); box-shadow: 0 2px 12px rgba(0,0,0,.06); display: grid; gap: 14px; }
.form label { display: grid; gap: 6px; font-weight: 600; font-size: .95rem; }
.form input, .form select, .form textarea {
  font: inherit; padding: 10px 12px; border: 1px solid #cfd8e3; border-radius: 8px; width: 100%;
}
.form input:focus, .form select:focus, .form textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }

/* Pied de page */
.footer { background: var(--primary-dark); color: #cfd8e3; text-align: center; padding: 24px 0; font-size: .9rem; }
.footer .legal { opacity: .7; font-size: .8rem; margin-top: 4px; }

/* Bouton WhatsApp flottant */
.wa-float {
  position: fixed; right: 18px; bottom: 18px;
  width: 56px; height: 56px; border-radius: 50%;
  background: #25d366; color: #fff; font-size: 1.6rem;
  display: grid; place-items: center; text-decoration: none;
  box-shadow: 0 4px 14px rgba(0,0,0,.25);
}

/* Mobile */
@media (max-width: 800px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none; position: absolute; top: 72px; left: 0; right: 0;
    background: #fff; box-shadow: 0 8px 12px rgba(0,0,0,.08); flex-direction: column; padding: 16px 0 24px;
  }
  .nav-links.open { display: flex; }
  .two-cols { grid-template-columns: 1fr; }
  .sectors-grid, .cards { grid-template-columns: 1fr 1fr; }
  .projects { grid-template-columns: 1fr; max-width: 480px; }
  .about-img { max-height: 200px; }
  .values { grid-template-columns: 1fr; }
  .section { padding: 56px 0; }
}

@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
}