/* =========
   Thème & Tokens
   ========= */
:root {
  --surface: #0f0f10;
  --text: #f5f5f7;
  --muted: #a9a9b2;
  --border: #2a2a2d;
  --bg: #1a1a1d;
  --accent: #0a66ff;
  --accent-press: #0043a3;
  --shadow: rgba(0,0,0,0.8);
  --hero: #ffffff;
  --hero2: #cfcfd4;
  --herobox: rgba(0, 0, 0, 0.65);
  --body: linear-gradient(180deg, #0f0f10 0%, #131313 100%);

  --radius: 12px;
  --radius-sm: 10px;
  --container: 900px;
  --space-1: .5rem;
  --space-2: .75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --ts-1: 0.2s ease;
  --ts-2: 0.35s ease;
}

/* Reset & Base */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: var(--body);
  color: var(--text);
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; height: auto; }
a { color: inherit; }

/* Headings */
h1, h2, h3 {
  color: var(--text);
  font-weight: 700;
  margin: 0 0 var(--space-3);
}
h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: 1.15; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2rem); }
h3 { font-size: clamp(1.05rem, 2.2vw, 1.25rem); font-weight: 600; }

/* Utilities */
.container, .container-card {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
}
.text-center { text-align: center; }
.sr-only { position: absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0; }
.skip-link {
  position:absolute; left:-9999px; top:auto; width:1px; height:1px; overflow:hidden;
}
.skip-link:focus {
  left: 1rem; top: 1rem; width:auto; height:auto; padding:.6rem .8rem; background:#000; color:#fff; border-radius:8px; z-index:999;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(140%) blur(6px);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding: .75rem var(--space-4);
}

/* Logo */
.logo img { width: 160px; }

/* Nav */
.main-nav { display: flex; align-items: center; gap: var(--space-5); }
.nav-toggle {
  display: none;
  font-size: 1.75rem;
  background: none; border: none; cursor: pointer; color: var(--text);
}
.nav-links {
  display: flex; gap: var(--space-5); align-items: center;
}
.nav-links a {
  position: relative; color: var(--text); font-weight: 500; text-decoration: none; padding-bottom: 4px; transition: color var(--ts-1);
}
.nav-links a::after {
  content: ""; position: absolute; bottom: 0; left: 0; height: 2px; width: 0;
  background: var(--accent); transition: width var(--ts-1);
}
.nav-links a:hover::after,
.nav-links a:focus::after { width: 100%; }
.nav-links a:hover,
.nav-links a:focus { color: var(--accent); }

/* Mobile Nav */
@media (max-width: 768px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute; right: 1rem; top: 64px; z-index: 200;
    display: grid; gap: 1rem; padding: 1rem 1.25rem;
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    box-shadow: 0 14px 32px rgba(0,0,0,.35);
    transform-origin: top right; transform: scale(.98) translateY(-6px); opacity: 0; pointer-events: none;
    transition: transform var(--ts-2), opacity var(--ts-2);
  }
  .nav-links.active { transform: none; opacity: 1; pointer-events: auto; }
  .logo img { width: 200px; }
}

/* Hero */
.hero {
  /* Fallback PNG */
  background: url('images/background18.png') center/cover no-repeat fixed;

  /* WebP moderne */
  background-image: image-set(
      url('images/background18_optimized.webp') type('image/webp') 1x,
      url('images/background18.png') type('image/png') 1x
  );

  min-height: 55vh;
  padding: var(--space-6) var(--space-4);
  display: grid; place-items: center;
  position: relative; text-align: center; color: white;
}

/* Mobile: image plus légère */
@media (max-width: 768px) {
  .hero {
    background-attachment: scroll;
    background-image: url('images/background18.png');
    background-image: image-set(
      url('images/background18_mobile.webp') type('image/webp') 1x,
      url('images/background18.png') type('image/png') 1x
    );
  }
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, rgba(0,0,0,.78) 0%, rgba(0,0,0,.28) 60%, rgba(0,0,0,.18) 100%),
    radial-gradient(60% 60% at 50% 30%, rgba(0,0,0,.32), transparent);
  z-index: 1;
}

/* Hero box — verre dépoli */
.hero-box {
  position: relative;
  z-index: 2;
  max-width: 860px;
  width: 100%;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(6px) saturate(150%);
  -webkit-backdrop-filter: blur(6px) saturate(150%);
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.18);
  box-shadow: 0 20px 40px rgba(0,0,0,0.6);
}
.hero-box::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.1),
              inset 0 -1px 0 rgba(255,255,255,0.05);
}

.hero-title {
  color: var(--hero);
  font-weight: 800;
  font-size: clamp(2rem, 4.5vw, 2.8rem);
  line-height: 1.12;
  margin: 0 0 0.75rem 0;
}
.hero-subtitle {
  color: var(--hero2);
  max-width: 720px;
  margin: 0 auto 1.6rem;
  font-size: clamp(1.05rem, 2vw, 1.15rem);
  line-height: 1.55;
}

/* Button */
.btn-primary {
  background: var(--accent); color: #fff; padding: 14px 28px; border: 0; border-radius: 10px;
  font-size: 1.05rem; font-weight: 700; cursor: pointer; text-decoration: none; display: inline-block;
  transition: transform var(--ts-1), box-shadow var(--ts-1), background var(--ts-1);
  box-shadow: 1px 1px 2px var(--shadow);
}
.btn-primary:hover { transform: translateY(-2px); background: var(--accent-press); box-shadow: 5px 7px 14px var(--shadow); opacity: 1; }
.btn-primary:active { transform: translateY(0); }

/* Section titles */
.section-title {
  text-align: center;
  margin-bottom: var(--space-6);
}

/* Grid & Cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-5);
}
.card {
  background: var(--bg); padding: var(--space-5) var(--space-4);
  border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: 6px 8px 16px var(--shadow);
  transition: transform .45s ease, box-shadow .35s ease, opacity .4s ease, filter .4s ease;
  opacity: .98;
}
.card:hover { transform: translateY(-4px); box-shadow: 10px 14px 28px var(--shadow); opacity: 1; }

/* Icônes des cartes */
.card-icon {
  margin-bottom: 0.9rem;
  color: var(--text);
  opacity: 0.95;
  transition: color 0.25s ease, opacity 0.25s ease, transform 0.25s ease;
}
.card .icon { width: 40px; height: 40px; display: inline-block; }
.card:hover .card-icon { color: var(--accent); opacity: 1; transform: translateY(-1px); }

@media (max-width: 480px) {
  .card .icon { width: 36px; height: 36px; }
}

/* About */
.about-text {
  max-width: 700px; margin: 0 auto; font-size: clamp(1rem, 1.8vw, 1.125rem);
  color: var(--muted); line-height: 1.75; text-align: center;
}

/* Contact */
.contact-info {
  list-style: none; padding: 0; margin: var(--space-3) 0 var(--space-5);
  color: var(--muted); font-weight: 600; text-align: center;
}
.contact-info li { margin-bottom: .6rem; }
.contact-info a { color: var(--accent); text-decoration: none; }
.contact-info a:hover, .contact-info a:focus { text-decoration: underline; }

.contact-form {
  max-width: 600px; margin: 0 auto; display: flex; flex-direction: column; gap: 1rem;
}
.contact-form input, .contact-form textarea {
  padding: 14px 16px; background: var(--bg); color: var(--text);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm); font: inherit; resize: vertical;
  transition: border-color var(--ts-1), box-shadow var(--ts-1), transform var(--ts-1);
}
.contact-form input:focus, .contact-form textarea:focus {
  border-color: var(--accent); outline: none; box-shadow: 0 0 0 4px rgba(10,102,255,.15);
}
.contact-form button { align-self: center; max-width: 200px; }

/* Footer */
.site-footer {
  background: var(--surface); border-top: 1px solid var(--border);
  color: var(--muted); text-align: center; padding: var(--space-6) var(--space-4);
  font-size: .95rem; user-select: none;
}
.site-footer .made-by {
  font-size: 0.85rem;
  opacity: 0.8;
}

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(10px); filter: blur(2px); }
.reveal-in { opacity: 1; transform: none; filter: none; transition: opacity .6s ease, transform .6s ease, filter .6s ease; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal-in { opacity: 1 !important; transform: none !important; filter: none !important; }
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .container, .container-card { padding: var(--space-5) var(--space-3); }
  .hero { min-height: 45vh; }
  .grid { gap: var(--space-4); }
}
@media (max-width: 480px) {
  .btn-primary { padding: 12px 22px; font-size: 1rem; }
}

/* Apparition douce du hero */
.hero-title,
.hero-subtitle,
.hero .btn-primary {
  opacity: 0;
  transform: translateY(14px);
  animation: fadeUp 0.8s ease forwards;
}
.hero-subtitle { animation-delay: 0.15s; }
.hero .btn-primary { animation-delay: 0.3s; }

@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

/* Accessibilité: réduit la motion */
@media (prefers-reduced-motion: reduce) {
  .hero-title,
  .hero-subtitle,
  .hero .btn-primary {
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}

/* Form helpers */
.form-status { color: var(--muted); text-align: center; }