/* Software Factory — vitrine statique. CSS pur, zéro dépendance.
   Sobre, technique, accessible. Thème clair + variante sombre auto. */

:root {
  --bg: #fbfbfa;
  --bg-alt: #f2f2ef;
  --surface: #ffffff;
  --ink: #14171a;
  --ink-soft: #4a5560;
  --line: #e2e2dd;
  --accent: #1f6feb;
  --accent-ink: #ffffff;
  --auto: #1a7f5a;
  --gate: #9a6a00;
  --hitl: #b23a48;
  --radius: 12px;
  --maxw: 72rem;
  --space: clamp(1rem, 2.5vw, 2rem);
  font-synthesis: none;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1216;
    --bg-alt: #151a20;
    --surface: #181d23;
    --ink: #eef1f4;
    --ink-soft: #aab4be;
    --line: #2a3138;
    --accent: #4f93ff;
    --auto: #3fbf8f;
    --gate: #e0a83c;
    --hitl: #ef6b7a;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--space);
}

/* Accessibilité — lien d'évitement + focus visible */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.6rem 1rem;
  border-radius: 0 0 var(--radius) 0;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

a {
  color: var(--accent);
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* En-tête / nav */
.site-header {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  z-index: 50;
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0.75rem var(--space);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand-mark {
  color: var(--accent);
  font-size: 1.2em;
}
.nav-links {
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.95rem;
}
.nav-links a:hover {
  color: var(--ink);
}
@media (max-width: 38rem) {
  .nav-links {
    display: none;
  }
}

/* Héro */
.hero {
  padding: clamp(3rem, 9vw, 6.5rem) 0 clamp(2.5rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 0 0 0.75rem;
}
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
  max-width: 18ch;
}
.lede {
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  color: var(--ink);
  margin: 0 0 0.75rem;
  max-width: 46ch;
}
.hero-sub {
  color: var(--ink-soft);
  max-width: 52ch;
  margin: 0 0 1.75rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: 600;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-primary:hover {
  filter: brightness(1.08);
}
.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover {
  background: var(--bg-alt);
}

/* Sections */
.section {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
}
.section-alt {
  background: var(--bg-alt);
}
.section h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}
.section-intro {
  color: var(--ink-soft);
  max-width: 56ch;
  margin: 0 0 2rem;
}

/* Boucle — étapes */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  counter-reset: none;
}
.step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.step-num {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.step h3 {
  margin: 0 0 0.35rem;
  font-size: 1.1rem;
}
.step p {
  margin: 0;
  color: var(--ink-soft);
}

/* Cartes différenciateurs */
.cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}
.card p {
  margin: 0;
  color: var(--ink-soft);
}

/* Niveaux de permission */
.perms {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  margin-bottom: 2rem;
}
.perm {
  border: 1px solid var(--line);
  border-left-width: 4px;
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--surface);
}
.perm-auto {
  border-left-color: var(--auto);
}
.perm-gate {
  border-left-color: var(--gate);
}
.perm-hitl {
  border-left-color: var(--hitl);
}
.perm-tag {
  font-weight: 700;
  margin: 0 0 0.35rem;
}
.perm-auto .perm-tag {
  color: var(--auto);
}
.perm-gate .perm-tag {
  color: var(--gate);
}
.perm-hitl .perm-tag {
  color: var(--hitl);
}
.perm-body {
  margin: 0;
  color: var(--ink-soft);
}

.safety-notes {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
}
.note {
  padding: 1.25rem;
  border: 1px dashed var(--line);
  border-radius: var(--radius);
}
.note h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}
.note p {
  margin: 0;
  color: var(--ink-soft);
}

/* CTA */
.section-cta {
  text-align: center;
  border-top: 1px solid var(--line);
}
.section-cta .section-intro {
  margin-inline: auto;
}

/* Pied */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}
.site-footer p {
  margin: 0.2rem 0;
}
.footer-fine {
  color: var(--ink-soft);
  font-style: italic;
}
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--bg-alt);
  padding: 0.1em 0.4em;
  border-radius: 5px;
  font-size: 0.9em;
}