:root {
  --ink: #17191b;
  --muted: #5c6063;
  --paper: #f5f5f2;
  --white: #fff;
  --orange: #e85b13;
  --line: #d8d8d3;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}
a { color: inherit; }
.site-header {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 16px max(24px, calc((100vw - var(--max)) / 2));
  background: rgba(255,255,255,.94);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}
.brand { text-decoration: none; display: flex; align-items: center; }
.brand img { display: block; width: 250px; height: auto; }
nav { display: flex; gap: 28px; align-items: center; }
nav a { text-decoration: none; font-weight: 700; font-size: .94rem; }
.nav-contact { color: var(--orange); }

.hero {
  min-height: 690px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr);
  max-width: var(--max);
  margin: 0 auto;
  background: var(--white);
}
.hero-content { padding: clamp(70px, 9vw, 130px) clamp(32px, 7vw, 95px); }
.eyebrow { color: var(--orange); font-weight: 800; font-size: .78rem; text-transform: uppercase; letter-spacing: .16em; }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 16px; font-size: clamp(4rem, 8vw, 7.2rem); line-height: .83; letter-spacing: -.075em; }
h1 em { color: var(--orange); font-style: normal; }
.lead { font-size: clamp(1.45rem, 2.5vw, 2rem); font-weight: 300; margin-bottom: 30px; }
.intro { max-width: 620px; color: var(--muted); font-size: 1.1rem; }
.button {
  display: inline-block;
  margin-top: 18px;
  padding: 14px 21px;
  border: 0;
  background: var(--orange);
  color: var(--white);
  text-decoration: none;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
.button:hover, .button:focus-visible { background: #bd4307; }
.hero-stone {
  min-height: 100%;
  display: flex;
  align-items: flex-end;
  padding: 54px;
  color: white;
  background:
    linear-gradient(180deg, rgba(0,0,0,.05), rgba(0,0,0,.72)),
    url('assets/silex-hero-lumineux.jpg') center center / cover no-repeat,
    #ddd8cf;
}
.hero-stone span { max-width: 360px; font-size: 1.35rem; font-weight: 700; }
.section { max-width: var(--max); margin: 0 auto; padding: clamp(72px, 9vw, 120px) clamp(24px, 5vw, 72px); }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 30px; }
h2 { font-size: clamp(2.4rem, 5vw, 4.5rem); line-height: .98; letter-spacing: -.055em; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 64px; border-top: 1px solid var(--ink); }
.cards article { padding: 34px 30px 20px 0; border-right: 1px solid var(--line); }
.cards article + article { padding-left: 30px; }
.cards article:last-child { border-right: 0; }
.number { color: var(--orange); font-weight: 800; }
h3 { margin-top: 44px; font-size: 1.45rem; line-height: 1.2; }
.cards p, .approach-panel > p:last-child, .contact-copy > p { color: var(--muted); }
.approach {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  background: linear-gradient(135deg, #ebe9e3 0%, #f8f7f3 58%, #e2ded5 100%);
  color: var(--ink);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.approach-panel > p:last-child { color: var(--muted); max-width: 580px; }
blockquote { margin: 0; border-left: 4px solid var(--orange); padding: 10px 0 10px 36px; }
blockquote p { font-size: clamp(1.5rem, 3vw, 2.45rem); line-height: 1.25; font-weight: 700; }
.origin { background: var(--white); }
.origin-heading { max-width: 850px; margin-bottom: 64px; }
.origin-heading h2 { margin-bottom: 0; }
.origin-content { display: grid; grid-template-columns: .9fr 1.1fr; gap: clamp(48px, 8vw, 110px); align-items: start; }
.origin-content p { color: var(--muted); }
.origin-lead { color: var(--ink) !important; font-size: 1.4rem; line-height: 1.4; font-weight: 700; }
.origin-aside { margin-top: 34px; padding: 22px 24px; border-left: 4px solid var(--orange); background: #f3f1eb; color: var(--ink) !important; font-weight: 700; }
.origin-quote { margin-top: 42px; }
.origin-quote p { margin-bottom: 0; color: var(--ink); font-size: clamp(1.35rem, 2.3vw, 2rem); }
.contact { display: grid; grid-template-columns: .8fr 1.2fr; gap: 90px; background: var(--white); }
.contact-copy a { color: var(--orange); font-weight: 800; }
.contact-form { display: grid; gap: 21px; }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
label { display: grid; gap: 7px; font-weight: 700; }
input, textarea {
  width: 100%;
  border: 1px solid #a9abad;
  border-radius: 0;
  background: #fafaf8;
  padding: 13px 14px;
  font: inherit;
  color: var(--ink);
}
input:focus, textarea:focus { outline: 3px solid rgba(232,91,19,.22); border-color: var(--orange); }
.consent { display: flex; grid-template-columns: auto 1fr; gap: 11px; align-items: flex-start; font-weight: 400; }
.consent input { width: 20px; height: 20px; margin-top: 3px; }
.hp { position: absolute; left: -9999px; }
.form-note { color: var(--muted); font-size: .85rem; }
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 42px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 30px;
  color: var(--muted);
  font-size: .88rem;
}
.footer-brand img { display: block; width: 170px; height: auto; }
.footer-links { display: grid; justify-items: end; align-content: start; gap: 5px; }

@media (max-width: 800px) {
  .site-header { min-height: 72px; }
  .brand img { width: 190px; }
  nav a:not(.nav-contact) { display: none; }
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-content { padding: 72px 24px; }
  h1 { font-size: clamp(4rem, 19vw, 6rem); }
  .hero-stone { min-height: 280px; background-size: auto 100%; padding: 30px 24px; }
  .section-heading, .cards, .approach, .origin-content, .contact { display: grid; grid-template-columns: 1fr; }
  .cards, .approach, .contact { gap: 0; }
  .origin-heading { margin-bottom: 42px; }
  .origin-content { gap: 38px; }
  .cards article, .cards article + article { padding: 28px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .cards article:last-child { border-bottom: 0; }
  h3 { margin-top: 24px; }
  .approach { gap: 52px; }
  .contact { gap: 54px; }
  .field-grid { grid-template-columns: 1fr; }
  footer { grid-template-columns: 1fr; }
  .footer-links { justify-items: start; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }