/* ASIT — feuille de styles du site vitrine.
   Couleurs tirées du logo : bleu du « A », trois verts des arcs, gris de « SIT ».
   Les arcs du logo sont le motif graphique du site. */

:root {
  --blue: #1469B3;
  --blue-strong: #0E5594;
  --blue-wash: #E8F0F9;
  --green-deep: #129A48;
  --green: #6AB446;
  --green-light: #97C876;
  --green-wash: #EAF4E3;
  --stone: #8E8A85;

  --bg: #F7F8F5;
  --surface: #FFFFFF;
  --surface-2: #EFF2EC;
  --ink: #15211B;
  --ink-soft: #4E5A53;
  --ink-faint: #7A847E;
  --line: #DCE2D8;
  --night: #0B2538;
  --night-ink: #E8EEF2;
  --night-soft: #A7B8C4;
  --focus: #1469B3;

  --font-display: "Lexend", system-ui, sans-serif;
  --font-body: "Public Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius: 10px;
  --radius-lg: 18px;
  --shadow: 0 1px 2px rgba(21, 33, 27, .05), 0 8px 24px -12px rgba(21, 33, 27, .14);
  --wrap: 1180px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --blue: #5B9FE0;
    --blue-strong: #84B8EA;
    --blue-wash: #13283B;
    --green-deep: #3FBF73;
    --green: #86C766;
    --green-light: #A8D58C;
    --green-wash: #15291C;
    --bg: #0C1612;
    --surface: #121F19;
    --surface-2: #182820;
    --ink: #E6EDE8;
    --ink-soft: #A9B6AE;
    --ink-faint: #7F8C85;
    --line: #24362C;
    --night: #08141E;
    --shadow: none;
    --focus: #84B8EA;
    color-scheme: dark;
  }
}

/* ---------- Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 88px; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1.0625rem/1.65 var(--font-body); -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
a { color: var(--blue); text-underline-offset: .18em; }
a:hover { color: var(--blue-strong); }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--ink); line-height: 1.15; letter-spacing: -.015em; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.2rem, 4.6vw, 3.6rem); font-weight: 650; }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 600; }
h3 { font-size: 1.25rem; font-weight: 600; }
p { margin: 0; }
p + p { margin-top: 1em; }
ul { margin: 0; padding: 0; }
.wrap { width: min(var(--wrap), 100% - 40px); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; z-index: 50; background: var(--ink); color: var(--bg); padding: 10px 14px; border-radius: var(--radius); }
.skip:focus { top: 12px; }

.eyebrow { display: inline-flex; align-items: center; gap: 10px; font: 600 .78rem/1 var(--font-display); letter-spacing: .14em; text-transform: uppercase; color: var(--green-deep); }
.eyebrow::before { content: ""; width: 22px; height: 11px; border: 3px solid currentColor; border-bottom: 0; border-radius: 22px 22px 0 0; }
.lead { font-size: clamp(1.1rem, 1.6vw, 1.25rem); color: var(--ink-soft); max-width: 62ch; }
.muted { color: var(--ink-soft); }

/* ---------- Boutons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 0 22px; border-radius: 999px; border: 2px solid transparent; font: 600 1rem/1 var(--font-display); text-decoration: none; cursor: pointer; transition: background-color .2s, color .2s, border-color .2s, transform .2s; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-strong); color: #fff; }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-light { background: #fff; color: var(--night); }
.btn-light:hover { background: var(--green-wash); color: var(--night); }
.btn .arrow { transition: transform .2s; }
.btn:hover .arrow { transform: translateX(3px); }
@media (prefers-color-scheme: dark) { .btn-primary { color: #06121D; } .btn-primary:hover { color: #06121D; } }

/* ---------- En-tête ---------- */
.site-header { position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: saturate(160%) blur(10px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.site-header.is-scrolled { border-bottom-color: var(--line); }
.header-in { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 76px; }
.brand { display: block; flex: none; }
.brand-logo { width: 84px; }
.brand-logo-dark { display: none; }
@media (prefers-color-scheme: dark) { .brand-logo-light { display: none; } .brand-logo-dark { display: block; } }
.nav { display: flex; align-items: center; gap: 28px; }
.nav ul { display: flex; gap: 6px; list-style: none; }
.nav ul a { display: block; padding: 10px 14px; border-radius: 999px; color: var(--ink-soft); font: 500 .98rem/1 var(--font-display); text-decoration: none; }
.nav ul a:hover { color: var(--ink); background: var(--surface-2); }
.nav ul a[aria-current="page"] { color: var(--blue); background: var(--blue-wash); }
.nav-cta { min-height: 44px; padding: 0 18px; font-size: .95rem; }
.nav-toggle { display: none; width: 46px; height: 46px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); cursor: pointer; }
.nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after { display: block; width: 20px; height: 2px; margin: auto; background: var(--ink); border-radius: 2px; position: relative; transition: transform .2s, background-color .2s; }
.nav-toggle-bars::before, .nav-toggle-bars::after { content: ""; position: absolute; left: 0; }
.nav-toggle-bars::before { top: -6px; } .nav-toggle-bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav { position: absolute; inset: 76px 0 auto 0; display: none; flex-direction: column; align-items: stretch; gap: 14px; padding: 16px 20px 24px; background: var(--bg); border-bottom: 1px solid var(--line); box-shadow: var(--shadow); }
  .nav.is-open { display: flex; }
  .nav ul { flex-direction: column; gap: 2px; }
  .nav ul a { padding: 14px 12px; border-radius: var(--radius); font-size: 1.05rem; }
}

/* ---------- Sections ---------- */
.section { padding-block: clamp(64px, 9vw, 112px); }
.section-tight { padding-block: clamp(48px, 6vw, 72px); }
.section-alt { background: var(--surface); border-block: 1px solid var(--line); }
.section-head { display: grid; gap: 16px; max-width: 760px; margin-bottom: clamp(32px, 5vw, 56px); }
.section-head.center { margin-inline: auto; text-align: center; justify-items: center; }

/* ---------- Accueil : héros ---------- */
.hero { position: relative; overflow: hidden; padding-block: clamp(48px, 8vw, 104px) clamp(56px, 8vw, 96px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: clamp(32px, 5vw, 72px); align-items: center; }
.hero-copy { display: grid; gap: 22px; }
.hero-copy h1 em { font-style: normal; color: var(--blue); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 6px; }
.hero-places { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--ink-faint); font-size: .95rem; }
.hero-places span { display: inline-flex; align-items: center; gap: 8px; }
.hero-places span::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--green); }
.hero-visual { position: relative; aspect-ratio: 1 / 1; }
.hero-arcs { width: 100%; height: 100%; }
.hero-arcs path { fill: none; stroke-linecap: round; }
.orbit-chip { position: absolute; display: inline-flex; align-items: center; gap: 8px; padding: 9px 14px; border-radius: 999px; background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow); font: 600 .86rem/1 var(--font-display); color: var(--ink); white-space: nowrap; }
.orbit-chip i { width: 9px; height: 9px; border-radius: 50%; background: var(--c, var(--green)); flex: none; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: minmax(0, 1fr); }
  .hero-visual { max-width: 420px; width: 100%; margin-inline: auto; }
}

/* ---------- Bandeau de preuves ---------- */
.proof { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; }
.proof > div { background: var(--surface); padding: 24px 22px; display: grid; gap: 6px; align-content: start; }
.proof b { font: 650 clamp(1.7rem, 3vw, 2.2rem)/1 var(--font-display); color: var(--blue); font-variant-numeric: tabular-nums; }
.proof span { color: var(--ink-soft); font-size: .95rem; line-height: 1.45; }
@media (max-width: 760px) { .proof { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* ---------- Cartes d'expertise ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(280px, 100%), 1fr)); gap: 18px; }
.card { position: relative; display: grid; gap: 12px; align-content: start; padding: 28px 26px 26px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow); transition: border-color .2s, transform .2s; }
a.card { color: inherit; text-decoration: none; }
a.card:hover { border-color: var(--green); transform: translateY(-2px); }
.card p { color: var(--ink-soft); }
.card-icon { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; background: var(--green-wash); color: var(--green-deep); }
.card-icon svg { width: 24px; height: 24px; }
.card-icon.blue { background: var(--blue-wash); color: var(--blue); }
.card-more { margin-top: 4px; font: 600 .92rem/1 var(--font-display); color: var(--blue); }

/* ---------- Méthode (étapes réelles, dans l'ordre) ---------- */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; counter-reset: step; list-style: none; }
.step { position: relative; padding: 26px 22px 24px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); counter-increment: step; display: grid; gap: 10px; align-content: start; }
.step::before { content: counter(step, decimal-leading-zero); font: 650 .9rem/1 var(--font-display); color: var(--green-deep); letter-spacing: .08em; }
.step p { color: var(--ink-soft); font-size: .98rem; }
@media (max-width: 960px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .steps { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Réalisations ---------- */
.cases { display: grid; gap: 22px; }
.case { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(20px, 4vw, 48px); padding: clamp(24px, 4vw, 40px); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.case-head { display: grid; gap: 14px; align-content: start; }
.case-sector { font: 600 .78rem/1 var(--font-display); letter-spacing: .12em; text-transform: uppercase; color: var(--green-deep); }
.case-head p { color: var(--ink-soft); }
.case-link { font: 600 .95rem/1 var(--font-display); }
.case-body { display: grid; gap: 18px; align-content: start; }
.case-body h4 { font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; color: var(--ink-faint); margin-bottom: 8px; }
.checks { list-style: none; display: grid; gap: 9px; }
.checks li { position: relative; padding-left: 28px; }
.checks li::before { content: ""; position: absolute; left: 0; top: .5em; width: 14px; height: 7px; border-left: 2.5px solid var(--green-deep); border-bottom: 2.5px solid var(--green-deep); transform: rotate(-45deg); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; }
.tags li { padding: 6px 12px; border-radius: 999px; background: var(--surface-2); color: var(--ink-soft); font: 500 .85rem/1.2 var(--font-display); }
.case-fact { display: inline-flex; align-items: baseline; gap: 10px; padding: 14px 16px; border-radius: var(--radius); background: var(--blue-wash); color: var(--ink); }
.case-fact b { font: 650 1.5rem/1 var(--font-display); color: var(--blue); }
@media (max-width: 860px) { .case { grid-template-columns: minmax(0, 1fr); } }

/* Aperçu des réalisations (accueil) */
.case-tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(260px, 100%), 1fr)); gap: 18px; }
.case-tile { display: grid; gap: 10px; align-content: start; padding: 24px; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); text-decoration: none; color: inherit; transition: border-color .2s, transform .2s; }
.case-tile:hover { border-color: var(--blue); transform: translateY(-2px); color: inherit; }
.case-tile p { color: var(--ink-soft); font-size: .97rem; }

/* ---------- Engagements / listes à deux colonnes ---------- */
.split { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
@media (max-width: 860px) { .split { grid-template-columns: minmax(0, 1fr); } }
.pledges { display: grid; gap: 14px; list-style: none; }
.pledges li { display: grid; gap: 4px; padding: 20px 22px; border-left: 4px solid var(--green); background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; }
.pledges li:nth-child(2) { border-left-color: var(--green-deep); }
.pledges li:nth-child(3) { border-left-color: var(--blue); }
.pledges li:nth-child(4) { border-left-color: var(--green-light); }
.pledges b { font: 600 1.05rem/1.3 var(--font-display); }
.pledges span { color: var(--ink-soft); }

/* ---------- Bandeau d'appel (fond nuit + arcs) ---------- */
.cta-band { position: relative; overflow: hidden; background: var(--night); color: var(--night-ink); border-radius: var(--radius-lg); padding: clamp(36px, 6vw, 64px); display: grid; gap: 18px; justify-items: start; }
.cta-band h2 { color: #fff; max-width: 22ch; }
.cta-band p { color: var(--night-soft); max-width: 58ch; }
.cta-band::after { content: ""; position: absolute; right: -120px; bottom: -220px; width: 460px; height: 460px; border-radius: 50%; border: 26px solid var(--green-deep); box-shadow: 0 0 0 26px var(--night), 0 0 0 52px #6AB446, 0 0 0 78px var(--night), 0 0 0 104px #97C876; opacity: .55; pointer-events: none; }
.cta-band > * { position: relative; z-index: 1; }

/* ---------- En-tête de page intérieure ---------- */
.page-hero { padding-block: clamp(48px, 7vw, 88px) clamp(32px, 5vw, 56px); }
.page-hero .wrap { display: grid; gap: 18px; max-width: 860px; margin-left: max(20px, calc((100% - var(--wrap)) / 2)); }

/* ---------- Expertises détaillées ---------- */
.expertise { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: clamp(24px, 5vw, 64px); padding-block: clamp(36px, 5vw, 56px); border-top: 1px solid var(--line); }
.expertise:first-of-type { border-top: 0; }
.expertise-head { display: grid; gap: 14px; align-content: start; }
.expertise-head p { color: var(--ink-soft); }
.expertise-body { display: grid; gap: 22px; }
.expertise-body .proof-line { padding: 16px 18px; border-radius: var(--radius); background: var(--green-wash); color: var(--ink); font-size: .98rem; }
.expertise-body .proof-line b { font-family: var(--font-display); }
@media (max-width: 860px) { .expertise { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Formation ---------- */
.formats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 860px) { .formats { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Contact ---------- */
.contact-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: clamp(24px, 5vw, 56px); align-items: start; }
@media (max-width: 900px) { .contact-grid { grid-template-columns: minmax(0, 1fr); } }
.form { display: grid; gap: 18px; padding: clamp(22px, 4vw, 36px); background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); box-shadow: var(--shadow); }
.form-row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 620px) { .form-row { grid-template-columns: minmax(0, 1fr); } }
.field { display: grid; gap: 7px; }
.field label { font: 600 .92rem/1.3 var(--font-display); color: var(--ink); }
.field .opt { font-weight: 400; color: var(--ink-faint); }
.field input, .field select, .field textarea { width: 100%; min-height: 48px; padding: 12px 14px; border: 1.5px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--ink); font: inherit; }
.field textarea { min-height: 150px; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus { outline: none; border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-wash); }
.field [aria-invalid="true"] { border-color: #C2412D; }
.consent { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: start; font-size: .92rem; color: var(--ink-soft); }
.consent input { width: 20px; height: 20px; margin-top: 2px; accent-color: var(--blue); }
.hp { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }
.form-status { padding: 14px 16px; border-radius: var(--radius); font-weight: 600; }
.form-status[data-state="ok"] { background: var(--green-wash); color: var(--green-deep); }
.form-status[data-state="error"] { background: #FBE9E5; color: #9A2E1D; }
@media (prefers-color-scheme: dark) { .form-status[data-state="error"] { background: #3A1A14; color: #F2A595; } }
.form-status:empty { display: none; }
.contact-aside { display: grid; gap: 16px; }
.contact-aside .card a { font-weight: 600; word-break: break-word; }

/* ---------- Pages légales ---------- */
.prose { max-width: 760px; }
.prose h2 { font-size: 1.35rem; margin: 2em 0 .6em; }
.prose p, .prose li { color: var(--ink-soft); }
.prose ul { padding-left: 1.2em; display: grid; gap: 6px; }
.todo { background: #FFF3C4; color: #5B4500; padding: 0 .3em; border-radius: 4px; }

/* ---------- Pied de page ---------- */
.site-footer { margin-top: clamp(64px, 9vw, 112px); background: var(--night); color: var(--night-soft); padding-top: 56px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: 32px; padding-bottom: 40px; }
.footer-brand img { width: 120px; margin-bottom: 18px; }
.footer-brand p { max-width: 34ch; }
.site-footer h2 { font-size: .8rem; letter-spacing: .14em; text-transform: uppercase; color: #fff; margin-bottom: 14px; }
.site-footer ul { list-style: none; display: grid; gap: 10px; }
.site-footer a { color: var(--night-ink); text-decoration: none; }
.site-footer a:hover { color: #fff; text-decoration: underline; }
.footer-contact span { display: block; font-size: .88rem; color: var(--night-soft); }
.footer-legal { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; padding-block: 22px 28px; border-top: 1px solid rgba(255, 255, 255, .1); font-size: .9rem; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .footer-brand { grid-column: 1 / -1; } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: minmax(0, 1fr); } }

/* ---------- Apparition au défilement (désactivée si mouvement réduit) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.is-visible { opacity: 1; transform: none; }
  .hero-arcs path { stroke-dasharray: var(--len); stroke-dashoffset: var(--len); animation: draw 1.4s cubic-bezier(.3, .7, .2, 1) forwards; }
  .hero-arcs path:nth-child(2) { animation-delay: .15s; } .hero-arcs path:nth-child(3) { animation-delay: .3s; }
  .orbit-chip { animation: float-in .6s ease both; animation-delay: calc(.6s + var(--i, 0) * .08s); }
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes float-in { from { opacity: 0; transform: translateY(8px); } }