/* Concept : la page se lit comme une planche de bureau d'études —
   papier quadrillé, cartouche, cotes et repères en police technique. */
:root {
  --paper: #f4f6f7;
  --sheet: #ffffff;
  --ink: #14232f;
  --ink-soft: #4c5d69;
  --line: #d5dde2;
  --grid: rgba(31, 111, 127, 0.07);
  --steel: #1f6f7f;
  --steel-deep: #155462;
  --signal: #d9641e;
  --on-steel: #ffffff;

  --f-display: "Archivo", "Arial Narrow", "Helvetica Neue", Arial, sans-serif;
  --f-body: "Source Sans 3", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --f-tech: "JetBrains Mono", Consolas, "Courier New", monospace;

  --wrap: 1120px;
  --gutter: clamp(16px, 4vw, 40px);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0f1a21;
    --sheet: #15232c;
    --ink: #e6edf0;
    --ink-soft: #a3b3bc;
    --line: #2a3b46;
    --grid: rgba(120, 190, 205, 0.06);
    --steel: #5fb3c3;
    --steel-deep: #8ccad6;
    --signal: #f08a4b;
    --on-steel: #0f1a21;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0f1a21;
  --sheet: #15232c;
  --ink: #e6edf0;
  --ink-soft: #a3b3bc;
  --line: #2a3b46;
  --grid: rgba(120, 190, 205, 0.06);
  --steel: #5fb3c3;
  --steel-deep: #8ccad6;
  --signal: #f08a4b;
  --on-steel: #0f1a21;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: var(--f-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
a { color: var(--steel); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}
h1, h2, h3 { font-family: var(--f-display); line-height: 1.1; margin: 0; text-wrap: balance; }
p { margin: 0; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.tech {
  font-family: var(--f-tech);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* ---------- En-tête ---------- */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 14px;
}
.brand {
  display: flex;
  flex-direction: column;
  line-height: 1;
  text-decoration: none;
  color: var(--ink);
}
.brand b {
  font-family: var(--f-display);
  font-weight: 800;
  font-size: 1.6rem;
  letter-spacing: 0.02em;
  color: var(--steel);
}
.brand span {
  font-family: var(--f-display);
  font-size: 0.72rem;
  letter-spacing: 0.32em;
  margin-top: 3px;
}
.nav { display: flex; align-items: center; gap: clamp(12px, 2.4vw, 28px); }
.nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.nav a:hover { color: var(--steel); }
.nav .btn { color: var(--on-steel); }
@media (max-width: 760px) {
  .nav a:not(.btn) { display: none; }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 3px;
  background: var(--steel);
  color: var(--on-steel);
  font-weight: 700;
  text-decoration: none;
  border: 1px solid var(--steel);
  transition: background 0.15s;
}
.btn:hover { background: var(--steel-deep); border-color: var(--steel-deep); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--paper); }

/* ---------- Accueil ---------- */
.hero .wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: center;
  padding-block: clamp(48px, 8vw, 96px);
}
.hero h1 {
  font-size: clamp(2.2rem, 5.2vw, 3.6rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-top: 14px;
}
.hero h1 em { font-style: normal; color: var(--steel); }
.hero .lead { margin-top: 20px; max-width: 34em; color: var(--ink-soft); font-size: 1.15rem; }
.hero .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

/* Cartouche, comme en bas à droite d'un plan */
.cartouche {
  background: var(--sheet);
  border: 2px solid var(--ink);
  font-size: 0.95rem;
  min-width: 0;
}
.cartouche .ct-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 2px solid var(--ink);
}
.cartouche .ct-head strong { font-family: var(--f-display); font-size: 1.05rem; letter-spacing: 0.04em; }
.cartouche dl { margin: 0; display: grid; grid-template-columns: auto 1fr; }
.cartouche dt, .cartouche dd {
  margin: 0;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
}
.cartouche dt { border-right: 1px solid var(--line); }
.cartouche dd { font-weight: 600; min-width: 0; }
.cartouche dl > :nth-last-child(-n+2) { border-bottom: 0; }
.cartouche .ct-foot {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  border-top: 2px solid var(--ink);
}

/* ---------- Sections ---------- */
section { scroll-margin-top: 80px; }
.section { padding-block: clamp(56px, 8vw, 96px); }
.section + .section { border-top: 1px solid var(--line); }
.section-head { display: grid; gap: 12px; max-width: 46em; margin-bottom: clamp(28px, 4vw, 44px); }
.section-head h2 { font-size: clamp(1.7rem, 3.6vw, 2.4rem); font-weight: 800; }
.section-head p { color: var(--ink-soft); }
.marker { display: inline-flex; align-items: center; gap: 10px; }
.marker::before { content: ""; width: 22px; height: 2px; background: var(--signal); }

/* Services */
.services {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service {
  grid-column: span 2;
  background: var(--sheet);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-width: 0;
}
.service.wide { grid-column: span 3; }
.service h3 { font-size: 1.25rem; font-weight: 700; }
.service p { color: var(--ink-soft); font-size: 1rem; }
.service ul { margin: 0; padding-left: 1.1em; color: var(--ink-soft); font-size: 0.98rem; }
.service .tech { color: var(--steel); }
@media (max-width: 900px) {
  .services { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .service, .service.wide { grid-column: span 1; }
  .service.wide:last-child { grid-column: span 2; }
}
@media (max-width: 600px) {
  .services { grid-template-columns: minmax(0, 1fr); }
  .service, .service.wide, .service.wide:last-child { grid-column: span 1; }
}

/* Livrables */
.deliverables { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.chip {
  font-family: var(--f-tech);
  font-size: 0.85rem;
  padding: 6px 12px;
  border: 1px solid var(--steel);
  color: var(--steel);
  background: var(--sheet);
  border-radius: 2px;
}

/* Méthode : une vraie séquence, donc numérotée */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  counter-reset: step;
}
.steps li {
  counter-increment: step;
  position: relative;
  padding: 44px 18px 0 0;
  min-width: 0;
}
.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  top: 0;
  left: 0;
  font-family: var(--f-tech);
  font-size: 0.8rem;
  color: var(--on-steel);
  background: var(--steel);
  padding: 3px 8px;
}
.steps li::after {
  content: "";
  position: absolute;
  top: 12px;
  left: 44px;
  right: 8px;
  border-top: 1px dashed var(--ink-soft);
}
.steps li:last-child::after { display: none; }
.steps h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
.steps p { color: var(--ink-soft); font-size: 0.95rem; }
@media (max-width: 860px) {
  .steps { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .steps li { padding: 0 0 0 56px; }
  .steps li::after { display: none; }
}

/* Réalisations */
.domains {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}
.domain {
  border-top: 3px solid var(--ink);
  padding-top: 16px;
  display: grid;
  gap: 8px;
  align-content: start;
  min-width: 0;
}
.domain h3 { font-size: 1.1rem; font-weight: 700; }
.domain p { color: var(--ink-soft); font-size: 0.96rem; }
@media (max-width: 860px) { .domains { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 20px; } }
@media (max-width: 480px) { .domains { grid-template-columns: minmax(0, 1fr); } }

/* À propos */
.about {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 64px);
  align-items: start;
}
.about .text { display: grid; gap: 16px; max-width: 38em; }
.about .text p { color: var(--ink-soft); }
.figures { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); }
.figure { background: var(--sheet); padding: 20px 22px; display: grid; gap: 2px; }
.figure b {
  font-family: var(--f-display);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--steel);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
@media (max-width: 860px) { .about { grid-template-columns: minmax(0, 1fr); } }

/* Contact */
.contact {
  background: var(--ink);
  color: var(--paper);
}
.contact .section-head p, .contact .tech { color: color-mix(in srgb, var(--paper) 72%, var(--ink)); }
.contact .marker::before { background: var(--signal); }
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: color-mix(in srgb, var(--paper) 18%, var(--ink));
  border: 1px solid color-mix(in srgb, var(--paper) 18%, var(--ink));
}
.contact-card {
  background: var(--ink);
  padding: 24px;
  display: grid;
  gap: 8px;
  align-content: start;
  min-width: 0;
}
.contact-card a, .contact-card address {
  color: var(--paper);
  font-style: normal;
  font-size: 1.15rem;
  font-weight: 600;
  text-decoration: none;
  overflow-wrap: anywhere;
}
.contact-card a:hover { text-decoration: underline; }
.contact .actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.contact .btn { background: var(--signal); border-color: var(--signal); color: #ffffff; }
.contact .btn:hover { filter: brightness(0.92); }
.contact .btn.ghost { background: transparent; color: var(--paper); border-color: var(--paper); }
.contact .btn.ghost:hover { background: var(--paper); color: var(--ink); filter: none; }
@media (max-width: 760px) { .contact-grid { grid-template-columns: minmax(0, 1fr); } }

/* Pied de page */
.site-footer { border-top: 1px solid var(--line); background: var(--paper); }
.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding-block: 22px;
  font-size: 0.92rem;
  color: var(--ink-soft);
}
.site-footer a { color: var(--ink-soft); }

/* Page texte (mentions légales) */
.page { padding-block: clamp(40px, 6vw, 72px); }
.page .doc {
  max-width: 46em;
  background: var(--sheet);
  border: 1px solid var(--line);
  padding: clamp(22px, 4vw, 44px);
  display: grid;
  gap: 18px;
}
.page h1 { font-size: clamp(1.8rem, 4vw, 2.4rem); font-weight: 800; }
.page h2 { font-size: 1.2rem; font-weight: 700; margin-top: 10px; }
.page p { color: var(--ink-soft); }

@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: minmax(0, 1fr); }
}
.section-title { font-size: clamp(1.7rem, 3.6vw, 2.4rem); font-weight: 800; }