/* =========================================================
   ARCOSTE — Landing page
   Palette tirée de la présentation : bleu marine institutionnel,
   orange "poutre de rack", cyan d'accent et gris acier clair.
   ========================================================= */

:root {
  --navy-950: #071a30;
  --navy-900: #0b2545;
  --navy-800: #13335c;
  --navy-700: #1a4173;
  --blue-500: #2a6bb3;
  --orange-500: #ec6f2d;
  --orange-600: #d65d1c;
  --cyan-400: #2fe0e8;
  --steel-50: #f5f7fa;
  --steel-100: #eef2f7;
  --steel-200: #dde4ee;
  --steel-400: #93a3b8;
  --ink-700: #33445a;
  --ink-900: #0f1b2b;
  --white: #ffffff;

  --font-display: "Barlow Condensed", "Arial Narrow", sans-serif;
  --font-body: "Barlow", "Segoe UI", system-ui, sans-serif;

  --radius: 4px;
  --container: 1200px;
  --header-h: 76px;
  --shadow-sm: 0 1px 2px rgba(11, 37, 69, 0.06), 0 2px 8px rgba(11, 37, 69, 0.06);
  --shadow-lg: 0 20px 50px -20px rgba(11, 37, 69, 0.35);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--header-h); }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink-700);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
ul { padding: 0; margin: 0; list-style: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy-900);
  line-height: 1.05;
  margin: 0;
  letter-spacing: -0.005em;
}

p { margin: 0; }

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 768px) { .container { padding-inline: 2rem; } }

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: 1rem; top: -100px; z-index: 100;
  background: var(--orange-500); color: var(--white);
  padding: 0.6rem 1rem; font-weight: 600; text-decoration: none;
}
.skip-link:focus { top: 1rem; }

:focus-visible { outline: 3px solid var(--orange-500); outline-offset: 3px; }

/* ---------- Shared bits ---------- */
.section { padding-block: clamp(4.5rem, 9vw, 7.5rem); }
.section--tint { background: var(--steel-100); }
.section--navy { background: var(--navy-900); color: #c9d6e8; }
.section--navy h2, .section--navy h3 { color: var(--white); }

.eyebrow {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600; font-size: 0.95rem;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--orange-500);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: ""; width: 28px; height: 3px; background: currentColor;
}
.eyebrow--cyan { color: var(--cyan-400); }

.section-title {
  font-size: clamp(2.1rem, 4.6vw, 3.4rem);
  font-weight: 700;
  max-width: 22ch;
}
.section-lead {
  margin-top: 1.25rem;
  font-size: 1.15rem;
  max-width: 60ch;
}
.section-head { margin-bottom: clamp(2.5rem, 5vw, 4rem); }
.section-head--center { text-align: center; }
.section-head--center .section-title,
.section-head--center .section-lead { margin-inline: auto; }
.section-head--center .eyebrow::after {
  content: ""; width: 28px; height: 3px; background: currentColor;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600; font-size: 1.05rem;
  letter-spacing: 0.06em; text-transform: uppercase;
  text-decoration: none;
  padding: 0.95rem 1.6rem;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease),
    border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.btn svg { width: 1.15em; height: 1.15em; transition: transform 0.25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }
.btn--primary { background: var(--orange-500); color: var(--white); }
.btn--primary:hover { background: var(--orange-600); }
.btn--ghost { border-color: rgba(255, 255, 255, 0.55); color: var(--white); }
.btn--ghost:hover { background: var(--white); color: var(--navy-900); border-color: var(--white); }
.btn--block { width: 100%; }

.icon-badge {
  display: grid; place-items: center; flex-shrink: 0;
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--navy-900); color: var(--white);
}
.icon-badge svg { width: 26px; height: 26px; }
.icon-badge--orange { background: var(--orange-500); }

/* ---------- Header ---------- */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--header-h);
  transition: background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.site-header.is-scrolled,
.site-header.is-open {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 1px 0 var(--steel-200), 0 8px 24px -16px rgba(11, 37, 69, 0.3);
  backdrop-filter: saturate(1.4) blur(8px);
}
.header-inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
}
.brand {
  display: inline-flex; align-items: center;
  background: var(--white); padding: 6px 10px; border-radius: var(--radius);
}
.brand img { height: 40px; width: auto; }

.main-nav { display: none; }
.main-nav ul { display: flex; gap: 2rem; }
.main-nav a {
  position: relative;
  font-weight: 600; font-size: 0.98rem; text-decoration: none;
  color: var(--white);
  padding-block: 0.4rem;
  transition: color 0.2s;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 2px; background: var(--orange-500);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.main-nav a:hover::after,
.main-nav a.is-active::after { transform: scaleX(1); }
.is-scrolled .main-nav a { color: var(--navy-900); }

.header-cta { display: none; padding: 0.7rem 1.2rem; font-size: 0.95rem; }

.nav-toggle {
  display: inline-grid; place-items: center;
  width: 46px; height: 46px;
  background: transparent; border: 0; cursor: pointer;
  color: var(--white);
}
.is-scrolled .nav-toggle, .is-open .nav-toggle { color: var(--navy-900); }
.nav-toggle svg { width: 28px; height: 28px; }
.nav-toggle .icon-close { display: none; }
.is-open .nav-toggle .icon-open { display: none; }
.is-open .nav-toggle .icon-close { display: block; }

.mobile-nav {
  position: fixed; inset: var(--header-h) 0 auto 0; z-index: 49;
  background: var(--white);
  border-top: 1px solid var(--steel-200);
  box-shadow: var(--shadow-lg);
  padding: 1rem 1.25rem 1.5rem;
  transform: translateY(-8px); opacity: 0; visibility: hidden;
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease), visibility 0.25s;
}
.mobile-nav.is-open { transform: none; opacity: 1; visibility: visible; }
.mobile-nav a:not(.btn) {
  display: block; padding: 0.85rem 0;
  border-bottom: 1px solid var(--steel-100);
  font-family: var(--font-display); font-weight: 600; font-size: 1.3rem;
  color: var(--navy-900); text-decoration: none;
}
.mobile-nav .btn { margin-top: 1.25rem; width: 100%; }

@media (min-width: 1024px) {
  .main-nav, .header-cta { display: inline-flex; }
  .nav-toggle, .mobile-nav { display: none; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative; isolation: isolate;
  min-height: 100svh;
  display: flex; align-items: flex-end;
  padding-top: calc(var(--header-h) + 4rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
  color: #d5e0ee;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; z-index: -2;
  width: 100%; height: 100%; object-fit: cover;
  transform: scale(1.06);
  animation: heroZoom 14s var(--ease) forwards;
}
.hero::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background:
    linear-gradient(180deg, rgba(7, 26, 48, 0.55) 0%, rgba(11, 37, 69, 0.72) 45%, rgba(7, 26, 48, 0.96) 100%),
    linear-gradient(90deg, rgba(7, 26, 48, 0.75) 0%, rgba(7, 26, 48, 0) 70%);
}
@keyframes heroZoom { to { transform: scale(1); } }

.hero-content { max-width: 880px; }
.hero h1 {
  color: var(--white);
  font-size: clamp(2.8rem, 7.4vw, 5.6rem);
  font-weight: 700;
  line-height: 0.98;
  text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--orange-500); }
.hero-sub {
  margin-top: 1.5rem;
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  max-width: 46ch;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 2.25rem; }

.hero-strip {
  margin-top: clamp(3rem, 6vw, 4.5rem);
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}
.hero-strip li {
  padding: 1.25rem 1rem 0 0;
  font-size: 0.92rem; line-height: 1.35;
}
.hero-strip strong {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  color: var(--white); font-weight: 700;
  margin-bottom: 0.2rem;
}
.hero-strip li + li { padding-left: 1rem; border-left: 1px solid rgba(255, 255, 255, 0.18); }

/* ---------- À propos ---------- */
.about-grid { display: grid; gap: clamp(2.5rem, 6vw, 5rem); align-items: center; }
@media (min-width: 960px) { .about-grid { grid-template-columns: 1.05fr 1fr; } }

.check-list { margin-top: 2rem; display: grid; gap: 1.1rem; }
.check-list li { display: flex; gap: 0.9rem; align-items: flex-start; }
.check-list svg {
  flex-shrink: 0; width: 26px; height: 26px; margin-top: 2px;
  color: var(--orange-500);
}
.check-list strong { color: var(--navy-900); }

.about-media { position: relative; }
.about-media::before {
  content: ""; position: absolute; z-index: -1;
  top: -18px; right: -18px; width: 55%; height: 60%;
  background: repeating-linear-gradient(-45deg, var(--orange-500) 0 2px, transparent 2px 12px);
  opacity: 0.35;
}
.about-media figure { margin: 0; box-shadow: var(--shadow-lg); }
.about-media img { width: 100%; aspect-ratio: 4 / 4.2; object-fit: cover; }
.about-media figcaption {
  background: var(--navy-900); color: var(--white);
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  letter-spacing: 0.04em; text-align: center;
  padding: 1.1rem 1rem;
}
.about-media figcaption span { color: var(--orange-500); margin-inline: 0.5rem; }

/* ---------- Vision ---------- */
.cards-3 { display: grid; gap: 1.5rem; }
@media (min-width: 860px) { .cards-3 { grid-template-columns: repeat(3, 1fr); } }

.vision-card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--steel-200);
  padding: 2.25rem 2rem 2.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.vision-card::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: 4px; background: var(--orange-500);
  transform: scaleX(0); transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.vision-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.vision-card:hover::after { transform: scaleX(1); }
.vision-card-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.vision-num {
  font-family: var(--font-display); font-weight: 700;
  font-size: 3.6rem; line-height: 1; color: var(--orange-500);
}
.vision-card h3 { font-size: 1.8rem; font-weight: 700; margin-bottom: 0.9rem; }

/* ---------- Mission ---------- */
.mission-grid { display: grid; gap: clamp(2.5rem, 6vw, 4.5rem); align-items: center; }
@media (min-width: 960px) { .mission-grid { grid-template-columns: 1fr 1.05fr; } }
.mission-media img {
  width: 100%; aspect-ratio: 1 / 1; object-fit: cover;
  box-shadow: var(--shadow-lg);
}
.feature-list { display: grid; gap: 2rem; margin-top: 2.5rem; }
.feature-list li { display: flex; gap: 1.25rem; align-items: flex-start; }
.feature-list h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: 0.3rem; }

.values-band {
  margin-top: clamp(3rem, 6vw, 4.5rem);
  background: var(--steel-100);
  border-left: 4px solid var(--orange-500);
  padding: 1.25rem 1.5rem;
  display: flex; flex-wrap: wrap; justify-content: center; gap: 0.5rem 1.5rem;
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  color: var(--navy-800); letter-spacing: 0.03em;
}
.values-band span + span::before {
  content: "·"; color: var(--orange-500); margin-right: 1.5rem;
}

/* ---------- Solutions ---------- */
.solutions-grid {
  display: grid; gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr));
}
@media (min-width: 1024px) {
  .solutions-grid { grid-template-columns: repeat(6, 1fr); }
  .solution-card { grid-column: span 2; }
  .solution-card:nth-child(4) { grid-column: 2 / span 2; }
}
.solution-card {
  background: var(--white);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.solution-media { position: relative; overflow: hidden; aspect-ratio: 16 / 10; }
.solution-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.7s var(--ease);
}
.solution-card:hover .solution-media img { transform: scale(1.06); }
.solution-media .icon-badge {
  position: absolute; left: 1.5rem; bottom: -28px;
  border: 4px solid var(--white);
  width: 64px; height: 64px;
}
.solution-body { padding: 2.6rem 1.5rem 1.75rem; }
.solution-body h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: 0.5rem; }

/* ---------- Expertise (chiffres) ---------- */
.expertise { position: relative; overflow: hidden; }
.expertise::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, transparent, #000 30%, #000 70%, transparent);
  pointer-events: none;
}
.expertise .container { position: relative; }
.stat-card {
  background: var(--navy-800);
  border: 1px solid rgba(255, 255, 255, 0.16);
  padding: 2.25rem 2rem 2.5rem;
  transition: border-color 0.3s, transform 0.35s var(--ease);
}
.stat-card:hover { border-color: var(--orange-500); transform: translateY(-4px); }
.stat-card > svg { width: 48px; height: 48px; color: var(--orange-500); margin-bottom: 1.75rem; }
.stat-value {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(2.6rem, 5vw, 3.8rem); line-height: 1;
  color: var(--orange-500);
  margin-bottom: 0.75rem;
}
.stat-value--text { font-size: clamp(2.1rem, 3.8vw, 2.8rem); }
.stat-card p { color: #dbe5f2; font-size: 1.08rem; }

/* ---------- Processus ---------- */
.process {
  position: relative;
  display: grid; gap: 2.5rem;
  counter-reset: step;
}
@media (min-width: 900px) {
  .process { grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
  .process::before {
    content: ""; position: absolute;
    top: 52px; left: 12.5%; right: 12.5%; height: 3px;
    background: var(--orange-500);
    transform: scaleX(var(--progress, 0)); transform-origin: left;
    transition: transform 1.4s var(--ease);
  }
  .process.is-visible { --progress: 1; }
}
.step { position: relative; text-align: center; }
.step-icon {
  position: relative; z-index: 1;
  display: grid; place-items: center;
  width: 104px; height: 104px; margin: 0 auto 1.5rem;
  border-radius: 50%;
  background: var(--navy-900); color: var(--white);
  box-shadow: 0 0 0 8px var(--steel-100);
  transition: background-color 0.3s;
}
.step:hover .step-icon { background: var(--orange-500); }
.step-icon svg { width: 44px; height: 44px; }
.step-num {
  display: block;
  font-family: var(--font-display); font-weight: 700;
  font-size: 1.9rem; color: var(--orange-500);
  margin-bottom: 0.4rem;
}
.step h3 { font-size: 1.55rem; font-weight: 700; margin-bottom: 0.5rem; }
.step p { max-width: 26ch; margin-inline: auto; }

/* ---------- Contact ---------- */
.contact { background: var(--navy-900); color: #c9d6e8; }
.contact-grid { display: grid; }
@media (min-width: 1024px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-info {
  position: relative; isolation: isolate;
  padding: clamp(4rem, 8vw, 6.5rem) clamp(1.25rem, 5vw, 4rem);
  overflow: hidden;
}
.contact-info-bg {
  position: absolute; inset: 0; z-index: -2;
  width: 100%; height: 100%; object-fit: cover;
}
.contact-info::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(160deg, rgba(11, 37, 69, 0.97) 35%, rgba(19, 51, 92, 0.82) 100%);
}
.contact-info h2 { color: var(--white); font-size: clamp(2.3rem, 5vw, 3.6rem); font-weight: 700; }
.contact-info .section-lead { color: #b9cbe2; }
.contact-list { margin-top: 2.5rem; display: grid; gap: 1.25rem; }
.contact-list li { display: flex; align-items: center; gap: 1.1rem; font-size: 1.12rem; color: var(--white); }
.contact-list a { text-decoration: none; }
.contact-list a:hover { color: var(--orange-500); }
.contact-list small { display: block; color: var(--steel-400); font-size: 0.85rem; letter-spacing: 0.08em; text-transform: uppercase; }

.contact-form-wrap {
  background: var(--white); color: var(--ink-700);
  padding: clamp(3rem, 6vw, 5rem) clamp(1.25rem, 5vw, 4rem);
}
.contact-form-wrap h3 { font-size: 2rem; font-weight: 700; }
.contact-form-wrap > p { margin-top: 0.5rem; }

.form { margin-top: 2rem; display: grid; gap: 1.1rem; }
.form-row { display: grid; gap: 1.1rem; }
@media (min-width: 640px) { .form-row { grid-template-columns: 1fr 1fr; } }
.field { display: grid; gap: 0.4rem; }
.field label { font-weight: 600; font-size: 0.92rem; color: var(--navy-900); }
.field label .req { color: var(--orange-500); }
.field input,
.field select,
.field textarea {
  width: 100%;
  font: inherit; font-size: 1rem; color: var(--ink-900);
  background: var(--steel-50);
  border: 1px solid var(--steel-200);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  transition: border-color 0.2s, box-shadow 0.2s, background-color 0.2s;
}
.field textarea { min-height: 130px; resize: vertical; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none; background: var(--white);
  border-color: var(--navy-700);
  box-shadow: 0 0 0 3px rgba(42, 107, 179, 0.18);
}
.field input:user-invalid,
.field textarea:user-invalid { border-color: #c2410c; }
.hidden-field { display: none; }
.form-note { font-size: 0.85rem; color: var(--steel-400); }
.form-status {
  display: none;
  padding: 1rem 1.1rem; border-radius: var(--radius);
  font-weight: 600;
}
.form-status.is-success { display: block; background: #e7f6ee; color: #146c43; border: 1px solid #b7e4c7; }
.form-status.is-error { display: block; background: #fdecec; color: #a12622; border: 1px solid #f5c2c0; }
.btn[disabled] { opacity: 0.7; cursor: wait; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy-950); color: var(--steel-400); padding-top: 4rem; font-size: 0.98rem; }
.footer-grid { display: grid; gap: 2.5rem; padding-bottom: 3rem; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.footer-brand .brand img { height: 46px; }
.footer-brand p { margin-top: 1.25rem; max-width: 38ch; }
.site-footer h4 {
  color: var(--white); font-size: 1.15rem; letter-spacing: 0.12em; text-transform: uppercase;
  margin-bottom: 1.1rem;
}
.site-footer li + li { margin-top: 0.55rem; }
.site-footer a { text-decoration: none; transition: color 0.2s; }
.site-footer a:hover { color: var(--orange-500); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-block: 1.5rem;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 0.75rem;
  font-size: 0.88rem;
}

/* ---------- Floating call button (mobile) ---------- */
.call-fab {
  position: fixed; right: 1rem; bottom: 1rem; z-index: 40;
  display: grid; place-items: center;
  width: 58px; height: 58px; border-radius: 50%;
  background: var(--orange-500); color: var(--white);
  box-shadow: 0 10px 25px -8px rgba(236, 111, 45, 0.7);
  transform: scale(0); transition: transform 0.3s var(--ease);
}
.call-fab.is-visible { transform: scale(1); }
.call-fab svg { width: 26px; height: 26px; }
@media (min-width: 1024px) { .call-fab { display: none; } }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s var(--ease), transform 0.8s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.no-js .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  .process { --progress: 1; }
}