/* ==========================================================================
   Atelier Ocade — feuille de style
   Palette et reglages globaux en haut, composants ensuite.
   ========================================================================== */

:root {
  --encre:        #1c1a17;
  --encre-douce:  #4f4a43;
  --papier:       #faf8f5;
  --papier-creux: #f1ece5;
  --trait:        #e0d8cd;
  --ocre:         #b4632b;
  --ocre-fonce:   #8c4a1d;

  --largeur: 68rem;
  --rayon: 4px;
  --transition: 180ms ease;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --encre:        #f2ede6;
    --encre-douce:  #b3aa9d;
    --papier:       #171513;
    --papier-creux: #211e1a;
    --trait:        #35302a;
    --ocre:         #d9873f;
    --ocre-fonce:   #e8a468;
  }
}

/* --- Base ---------------------------------------------------------------- */

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--papier);
  color: var(--encre);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.6em;
}

p { margin: 0 0 1em; }

a { color: inherit; }

.wrap {
  width: min(100% - 2.5rem, var(--largeur));
  margin-inline: auto;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  background: var(--encre);
  color: var(--papier);
  padding: 0.6rem 1rem;
  border-radius: var(--rayon);
}

:focus-visible {
  outline: 2px solid var(--ocre);
  outline-offset: 3px;
}

/* --- En-tete ------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--papier) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.site-header.est-defile { border-bottom-color: var(--trait); }

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.01em;
}
.logo-mark {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  background: var(--ocre);
  box-shadow: inset -3px -3px 0 color-mix(in srgb, var(--ocre) 60%, black);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: 0.95rem;
}
.nav a {
  text-decoration: none;
  color: var(--encre-douce);
  transition: color var(--transition);
}
.nav a:hover,
.nav a.est-actif { color: var(--encre); }

.nav-cta {
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--trait);
  border-radius: var(--rayon);
  color: var(--encre) !important;
}
.nav-cta:hover {
  background: var(--encre);
  color: var(--papier) !important;
  border-color: var(--encre);
}

.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  background: none;
  border: 1px solid var(--trait);
  border-radius: var(--rayon);
  cursor: pointer;
}
.burger span {
  display: block;
  height: 1.5px;
  width: 1.1rem;
  margin-inline: auto;
  background: var(--encre);
  transition: transform var(--transition), opacity var(--transition);
}
.burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

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

.hero {
  padding: clamp(4rem, 12vw, 8.5rem) 0 clamp(3rem, 8vw, 6rem);
  background:
    radial-gradient(60rem 30rem at 80% -10%, color-mix(in srgb, var(--ocre) 12%, transparent), transparent 70%);
}

.eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ocre);
  margin-bottom: 1.2rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 4rem);
  max-width: 24ch;
}

.lede {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--encre-douce);
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.4rem;
  border-radius: var(--rayon);
  border: 1px solid transparent;
  font: inherit;
  font-size: 0.98rem;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--ocre);
  color: #fff;
}
.btn-primary:hover { background: var(--ocre-fonce); }

.btn-ghost {
  border-color: var(--trait);
  color: var(--encre);
}
.btn-ghost:hover { border-color: var(--encre); }

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

.section { padding: clamp(3.5rem, 9vw, 6.5rem) 0; }
.section-alt { background: var(--papier-creux); }

.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.3rem);
  margin-bottom: 2rem;
}
.section-title::after {
  content: "";
  display: block;
  width: 2.5rem;
  height: 2px;
  margin-top: 0.9rem;
  background: var(--ocre);
}

.grid { display: grid; gap: 1.5rem; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(24rem, 1fr)); }

.card {
  padding: 1.8rem;
  background: var(--papier);
  border: 1px solid var(--trait);
  border-radius: var(--rayon);
  transition: border-color var(--transition), transform var(--transition);
}
.card:hover {
  border-color: var(--ocre);
  transform: translateY(-2px);
}
.card-num {
  display: block;
  font-family: var(--serif);
  font-size: 0.85rem;
  color: var(--ocre);
  letter-spacing: 0.1em;
  margin-bottom: 0.8rem;
}
.card h3 { font-size: 1.3rem; }
.card p { color: var(--encre-douce); margin: 0; }

/* --- Projets ------------------------------------------------------------- */

.projet {
  background: var(--papier);
  border: 1px solid var(--trait);
  border-radius: var(--rayon);
  overflow: hidden;
  transition: transform var(--transition), border-color var(--transition);
}
.projet:hover {
  transform: translateY(-3px);
  border-color: var(--ocre);
}

.projet-visuel {
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, var(--ocre) 0%, color-mix(in srgb, var(--ocre) 45%, var(--encre)) 100%);
}
.projet-visuel[data-teinte="b"] { background: linear-gradient(135deg, #5b6d5a, #2f3a30); }
.projet-visuel[data-teinte="c"] { background: linear-gradient(135deg, #8a6d8f, #3c2f42); }
.projet-visuel[data-teinte="d"] { background: linear-gradient(135deg, #4a6b7c, #24343d); }

.projet-texte { padding: 1.5rem 1.6rem 1.7rem; }
.projet-texte h3 { font-size: 1.35rem; }
.projet-texte p:last-child { color: var(--encre-douce); margin: 0; }

.meta {
  font-size: 0.78rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ocre);
  margin-bottom: 0.5rem;
}

/* --- L'atelier ----------------------------------------------------------- */

.atelier-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: clamp(2rem, 6vw, 4rem);
  align-items: start;
}
.atelier-inner p { color: var(--encre-douce); max-width: 46ch; }

.chiffres {
  display: grid;
  gap: 1.5rem;
  margin: 0;
  padding: 1.8rem;
  border-left: 2px solid var(--ocre);
}
.chiffres dt {
  font-size: 0.8rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--encre-douce);
}
.chiffres dd {
  margin: 0.2rem 0 0;
  font-family: var(--serif);
  font-size: 2.4rem;
  line-height: 1;
}

/* --- Contact ------------------------------------------------------------- */

.section-contact { background: var(--papier-creux); }

.form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.2rem;
  margin-top: 2rem;
  max-width: 44rem;
}
.champ { display: flex; flex-direction: column; gap: 0.4rem; }
.champ-large { grid-column: 1 / -1; }

.champ label {
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--encre-douce);
}
.champ input,
.champ textarea {
  font: inherit;
  padding: 0.7rem 0.85rem;
  color: var(--encre);
  background: var(--papier);
  border: 1px solid var(--trait);
  border-radius: var(--rayon);
  transition: border-color var(--transition);
}
.champ input:focus,
.champ textarea:focus { border-color: var(--ocre); }
.champ textarea { resize: vertical; }

.champ input[aria-invalid="true"],
.champ textarea[aria-invalid="true"] { border-color: #c0392b; }

.form-pied {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.form-note {
  margin: 0;
  font-size: 0.92rem;
  color: var(--encre-douce);
}
.form-note.est-ok { color: var(--ocre); }

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

.site-footer {
  padding: 2.5rem 0;
  border-top: 1px solid var(--trait);
  font-size: 0.92rem;
  color: var(--encre-douce);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-inner p { margin: 0; }
.footer-liens { display: flex; gap: 1.5rem; }
.footer-liens a { text-decoration: none; }
.footer-liens a:hover { color: var(--encre); }

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

@media (max-width: 46rem) {
  .burger { display: flex; }

  .nav {
    position: absolute;
    inset: 100% 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem 1.25rem 1.25rem;
    background: var(--papier);
    border-bottom: 1px solid var(--trait);
    display: none;
  }
  .nav.est-ouvert { display: flex; }
  .nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--trait);
  }
  .nav-cta {
    margin-top: 0.8rem;
    text-align: center;
  }

  .atelier-inner { grid-template-columns: 1fr; }
  .chiffres {
    grid-template-columns: repeat(3, 1fr);
    padding: 1.2rem 0 1.2rem 1.4rem;
  }
  .form { grid-template-columns: 1fr; }
}