/* =========================================================
   GROUPE MONTAIGNE - Feuille de style principale
   Design épuré, moderne, avec effets 3D
   ========================================================= */

/* ---------- Variables ---------- */
:root {
  --color-primary: #1a2845;
  --color-primary-light: #2d4368;
  --color-accent: #c89a5b;
  --color-accent-light: #e3b878;
  --color-bg: #fafaf7;
  --color-surface: #ffffff;
  --color-text: #1f2937;
  --color-text-soft: #4b5563;
  --color-border: #e5e7eb;

  --shadow-sm: 0 2px 8px rgba(26, 40, 69, 0.06);
  --shadow-md: 0 8px 24px rgba(26, 40, 69, 0.10);
  --shadow-lg: 0 20px 50px rgba(26, 40, 69, 0.15);
  --shadow-3d: 0 30px 60px -15px rgba(26, 40, 69, 0.30),
               0 18px 36px -18px rgba(26, 40, 69, 0.22);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;

  --transition: 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter",
               Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent); }

h1, h2, h3, h4 {
  font-family: "Playfair Display", "Georgia", serif;
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.25;
}
h1 { font-size: clamp(2rem, 4vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); margin-bottom: 1rem; }
h3 { font-size: 1.35rem; margin-bottom: 0.6rem; }

p { margin-bottom: 1rem; color: var(--color-text-soft); }

/* ---------- Layout ---------- */
.container {
  width: min(1200px, 92%);
  margin: 0 auto;
}
section { padding: 80px 0; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition), box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: var(--shadow-md); }
.nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0;
}
.brand {
  display: flex; align-items: baseline; gap: 8px;
  font-family: "Playfair Display", "Georgia", serif;
  font-size: 1.5rem; font-weight: 700;
  color: var(--color-primary);
}
.brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-accent);
  display: inline-block;
}
.brand small {
  font-family: -apple-system, "Inter", sans-serif;
  font-size: 0.7rem; letter-spacing: 2px;
  font-weight: 500; color: var(--color-text-soft);
  text-transform: uppercase;
}

.menu {
  display: flex; gap: 28px; list-style: none;
  align-items: center;
}
.menu a {
  font-size: 0.95rem; font-weight: 500;
  color: var(--color-text);
  position: relative; padding: 6px 2px;
}
.menu a::after {
  content: "";
  position: absolute; bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width var(--transition);
}
.menu a:hover::after, .menu a.active::after { width: 100%; }

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  transform: translateZ(0);
}
.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  box-shadow: var(--shadow-md);
}
.btn-primary:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-lg);
  color: #fff;
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-2px);
}

/* ---------- Hamburger ---------- */
.burger { display: none; background: none; border: none; cursor: pointer;
  width: 30px; height: 24px; position: relative; }
.burger span {
  display: block; position: absolute; height: 2px; width: 100%;
  background: var(--color-primary); border-radius: 2px;
  transition: all var(--transition);
}
.burger span:nth-child(1) { top: 0; }
.burger span:nth-child(2) { top: 11px; }
.burger span:nth-child(3) { top: 22px; }
.burger.open span:nth-child(1) { transform: rotate(45deg); top: 11px; }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: rotate(-45deg); top: 11px; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 120px 0 100px;
  overflow: hidden;
  perspective: 1500px;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(200, 154, 91, 0.15), transparent 40%),
    radial-gradient(circle at 85% 70%, rgba(26, 40, 69, 0.10), transparent 45%);
  z-index: -1;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px; align-items: center;
}
.hero-content .eyebrow {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(200, 154, 91, 0.15);
  color: var(--color-accent);
  border-radius: 50px;
  font-size: 0.8rem; font-weight: 600;
  letter-spacing: 1.5px; text-transform: uppercase;
  margin-bottom: 18px;
}
.hero-content h1 { margin-bottom: 20px; }
.hero-content h1 .accent {
  color: var(--color-accent);
  font-style: italic;
}
.hero-content .lede {
  font-size: 1.15rem; margin-bottom: 30px;
  max-width: 540px;
}
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  transform-style: preserve-3d;
  animation: float 6s ease-in-out infinite;
}
.hero-card {
  background: var(--color-surface);
  padding: 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3d);
  transform: rotateY(-12deg) rotateX(6deg);
  transition: transform var(--transition);
}
.hero-card:hover { transform: rotateY(-6deg) rotateX(2deg) scale(1.02); }
.hero-card .stat { display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.hero-card .stat:last-child { margin-bottom: 0; }
.hero-card .stat-num {
  font-family: "Playfair Display", serif;
  font-size: 2rem; font-weight: 700;
  color: var(--color-primary);
}
.hero-card .stat-label {
  font-size: 0.9rem; color: var(--color-text-soft);
}
.hero-blob {
  position: absolute;
  width: 360px; height: 360px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  border-radius: 47% 53% 64% 36% / 41% 51% 49% 59%;
  top: -40px; right: -40px;
  z-index: -1;
  opacity: 0.18;
  filter: blur(40px);
  animation: morph 12s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
@keyframes morph {
  0%, 100% { border-radius: 47% 53% 64% 36% / 41% 51% 49% 59%; }
  50% { border-radius: 60% 40% 36% 64% / 58% 38% 62% 42%; }
}

/* ---------- Section title ---------- */
.section-head {
  text-align: center;
  margin-bottom: 50px;
}
.section-head .eyebrow {
  display: inline-block;
  font-size: 0.8rem; letter-spacing: 2px;
  color: var(--color-accent);
  font-weight: 600; text-transform: uppercase;
  margin-bottom: 12px;
}
.section-head p { max-width: 620px; margin: 12px auto 0; }

/* ---------- Cards 3D ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
  perspective: 1200px;
}
.card {
  background: var(--color-surface);
  padding: 32px 28px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition);
  transform-style: preserve-3d;
  border: 1px solid rgba(26, 40, 69, 0.04);
  position: relative; overflow: hidden;
}
.card::before {
  content: "";
  position: absolute; top: 0; left: 0;
  width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-primary));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}
.card:hover {
  transform: translateY(-8px) rotateX(2deg);
  box-shadow: var(--shadow-3d);
}
.card:hover::before { transform: scaleX(1); }
.card .icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(200, 154, 91, 0.15), rgba(26, 40, 69, 0.08));
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  color: var(--color-primary);
}
.card h3 { margin-bottom: 10px; }
.card p { font-size: 0.95rem; margin-bottom: 0; }
.card .more {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 18px;
  font-size: 0.9rem; font-weight: 600;
  color: var(--color-accent);
}
.card .more::after {
  content: "→";
  transition: transform var(--transition);
}
.card:hover .more::after { transform: translateX(4px); }

/* ---------- Bandeau valeurs ---------- */
.values {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  margin: 0 auto;
  position: relative; overflow: hidden;
}
.values::before {
  content: "";
  position: absolute;
  top: -50%; right: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(200, 154, 91, 0.25), transparent 60%);
  border-radius: 50%;
}
.values h2 { color: #fff; }
.values .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px; margin-top: 30px;
  position: relative;
}
.values .item h3 {
  color: var(--color-accent-light);
  font-size: 1.1rem;
}
.values .item p { color: rgba(255,255,255,0.85); margin-bottom: 0; font-size: 0.95rem; }

/* ---------- Image bloc ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center;
}
.split .visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-3d);
  transform: perspective(1000px) rotateY(-4deg);
  transition: transform var(--transition);
}
.split .visual:hover { transform: perspective(1000px) rotateY(0deg); }
.split .visual img { width: 100%; display: block; }
.split.reverse .visual { transform: perspective(1000px) rotateY(4deg); }
.split.reverse .visual:hover { transform: perspective(1000px) rotateY(0deg); }

.feature-list { list-style: none; margin-top: 20px; }
.feature-list li {
  position: relative;
  padding: 10px 0 10px 32px;
  color: var(--color-text-soft);
}
.feature-list li::before {
  content: "✓";
  position: absolute; left: 0; top: 10px;
  width: 22px; height: 22px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 700;
}

/* ---------- Formulaire / Contact ---------- */
.contact-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-3d);
  overflow: hidden;
}
.contact-info {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  padding: 50px 40px;
  color: #fff;
}
.contact-info h2 { color: #fff; }
.contact-info p { color: rgba(255,255,255,0.85); }
.contact-info .infos { margin-top: 30px; }
.contact-info .infos div { margin-bottom: 18px; display: flex; align-items: flex-start; gap: 12px; }
.contact-info .infos span { color: var(--color-accent-light); font-weight: 600; }
.contact-info .infos a { color: #fff; }

.contact-form { padding: 50px 40px; }
.field { margin-bottom: 18px; }
.field label {
  display: block; font-size: 0.85rem; font-weight: 600;
  margin-bottom: 6px; color: var(--color-text);
}
.field input, .field textarea, .field select {
  width: 100%; padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: inherit; font-size: 0.95rem;
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(200, 154, 91, 0.15);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.75);
  padding: 60px 0 30px;
  margin-top: 80px;
}
.site-footer h4 { color: #fff; margin-bottom: 16px; font-size: 1rem; font-family: inherit; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
}
.footer-grid ul { list-style: none; }
.footer-grid ul li { margin-bottom: 8px; }
.footer-grid a { color: rgba(255,255,255,0.75); font-size: 0.95rem; }
.footer-grid a:hover { color: var(--color-accent-light); }
.footer-brand { font-family: "Playfair Display", serif; font-size: 1.6rem; color: #fff; margin-bottom: 12px; display: block; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 20px; margin-top: 40px;
  text-align: center;
  font-size: 0.85rem;
}

/* ---------- Animations on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .menu {
    display: none;
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: #fff;
    padding: 20px; gap: 14px;
    box-shadow: var(--shadow-md);
  }
  .menu.open { display: flex; }
  .burger { display: block; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .split { grid-template-columns: 1fr; gap: 40px; }
  .split.reverse .visual { transform: none; order: -1; }
  .split .visual { transform: none; order: -1; }
  .contact-card { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
  section { padding: 60px 0; }
}
@media (max-width: 540px) {
  .footer-grid { grid-template-columns: 1fr; }
  .contact-info, .contact-form { padding: 30px 24px; }
  .hero { padding: 60px 0 50px; }
}