/* =========================================================
   AlphaFlow — Landing page
   Palette dérivée du logo (bleu marine #0F2355)
   ========================================================= */

:root {
  --navy: #0f2355;
  --navy-dark: #081633;
  --navy-mid: #17306b;
  --steel: #5578ab;
  --amber: #e0993d;
  --amber-dark: #c17f28;
  --bg: #f4f6f9;
  --white: #ffffff;
  --text: #1a2438;
  --text-muted: #5b6478;
  --line: #dfe4ec;

  --font-display: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --container: 1140px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--navy);
  line-height: 1.15;
  margin: 0 0 .5em;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--amber-dark);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--amber);
  display: inline-block;
}

p { color: var(--text-muted); margin: 0 0 1em; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 4px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
}
.btn:hover { transform: translateY(-2px); }

.btn-primary {
  background: var(--amber);
  color: var(--navy-dark);
  box-shadow: 0 8px 20px rgba(224,153,61,.28);
}
.btn-primary:hover { background: var(--amber-dark); }

.btn-outline {
  background: transparent;
  border-color: rgba(255,255,255,.35);
  color: var(--white);
}
.btn-outline:hover { border-color: var(--white); }

.btn-outline-navy {
  background: transparent;
  border-color: var(--navy);
  color: var(--navy);
}
.btn-outline-navy:hover { background: var(--navy); color: var(--white); }

/* ---------- Header ---------- */
header.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(8, 22, 51, 0.0);
  transition: background .3s ease, box-shadow .3s ease, backdrop-filter .3s ease;
}
header.site-header.scrolled {
  background: rgba(8, 22, 51, 0.92);
  backdrop-filter: blur(8px);
  box-shadow: 0 4px 24px rgba(0,0,0,.15);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-logo img { height: 38px; width: auto; }
.nav-logo span {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--white);
  letter-spacing: .01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  color: rgba(255,255,255,.82);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color .15s ease;
}
.nav-links a:hover { color: var(--amber); }

.nav-cta { display: flex; align-items: center; gap: 18px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.nav-toggle span {
  width: 24px; height: 2px; background: var(--white); display: block;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: linear-gradient(160deg, var(--navy-dark) 0%, var(--navy) 55%, var(--navy-mid) 100%);
  color: var(--white);
  padding: 168px 0 120px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 40px;
  align-items: center;
  position: relative;
  z-index: 2;
}

.hero h1 {
  color: var(--white);
  font-size: clamp(2.1rem, 4vw, 3.15rem);
  margin-bottom: .45em;
}
.hero h1 em {
  font-style: normal;
  color: var(--amber);
}

.hero .lede {
  color: rgba(255,255,255,.78);
  font-size: 1.08rem;
  max-width: 540px;
  margin-bottom: 2em;
}

.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-visual svg { width: 100%; max-width: 460px; height: auto; }

.hero-bottom-line {
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(224,153,61,.5), transparent);
}

/* stat strip */
.stat-strip {
  background: var(--white);
  border-bottom: 1px solid var(--line);
}
.stat-strip .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding-top: 40px;
  padding-bottom: 40px;
}
.stat {
  text-align: left;
  border-left: 2px solid var(--amber);
  padding-left: 16px;
}
.stat .num {
  font-family: var(--font-display);
  font-size: 1.9rem;
  color: var(--navy);
  font-weight: 700;
  display: block;
}
.stat .label {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .05em;
  text-transform: uppercase;
  color: var(--text-muted);
}

/* ---------- Sections ---------- */
section { padding: 100px 0; }
.section-head {
  max-width: 640px;
  margin-bottom: 56px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* About */
.about { background: var(--bg); }
.about-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 64px;
  align-items: center;
}
.about-figure {
  position: relative;
  background: var(--navy);
  border-radius: 6px;
  aspect-ratio: 4/3.1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.about-figure svg { width: 74%; }

.about-copy h3 { font-size: 1.7rem; }
.about-copy .credential-row {
  display: flex;
  gap: 28px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.credential {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  max-width: 260px;
}
.credential .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--amber);
  margin-top: 7px;
  flex-shrink: 0;
}
.credential strong { display: block; color: var(--navy); font-size: .92rem; }
.credential span { color: var(--text-muted); font-size: .86rem; }

/* Services */
.services { background: var(--white); }
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 30px 26px;
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(15,35,85,.08);
  border-color: var(--amber);
}
.service-card .idx {
  font-family: var(--font-mono);
  color: var(--amber-dark);
  font-size: .8rem;
  margin-bottom: 18px;
  display: block;
}
.service-card h4 { font-size: 1.05rem; margin-bottom: .5em; }
.service-card p { font-size: .92rem; margin: 0; }

/* Why us */
.why { background: var(--navy-dark); color: var(--white); }
.why .section-head h2 { color: var(--white); }
.why .section-head p { color: rgba(255,255,255,.68); }
.why-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 6px;
  overflow: hidden;
}
.why-item {
  background: var(--navy-dark);
  padding: 34px 32px;
}
.why-item h4 {
  color: var(--white);
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 12px;
}
.why-item h4 .mk {
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: .85rem;
}
.why-item p { color: rgba(255,255,255,.62); font-size: .92rem; margin: 0; }

/* Contact */
.contact { background: var(--bg); }
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 56px;
}
.contact-info h3 { font-size: 1.4rem; }
.contact-list { list-style: none; padding: 0; margin: 28px 0 0; }
.contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}
.contact-list li:last-child { border-bottom: 1px solid var(--line); }
.contact-list .lbl {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--amber-dark);
  width: 90px;
  flex-shrink: 0;
  padding-top: 3px;
}
.contact-list a, .contact-list span.val { color: var(--navy); font-weight: 600; font-size: .96rem; }

.contact-form {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 40px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 18px; }
.field label {
  display: block;
  font-size: .82rem;
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 6px;
}
.field input, .field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--line);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: .94rem;
  background: var(--bg);
  color: var(--text);
  transition: border-color .15s ease;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--amber);
}
.field textarea { resize: vertical; min-height: 120px; }

.form-note { font-size: .8rem; color: var(--text-muted); margin-top: 14px; }

/* Footer */
footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,.55);
  padding: 44px 0 30px;
}
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 26px;
  border-bottom: 1px solid rgba(255,255,255,.1);
  margin-bottom: 22px;
}
.footer-logo { display: flex; align-items: center; gap: 10px; }
.footer-logo img { height: 30px; }
.footer-logo span { font-family: var(--font-display); color: var(--white); font-weight: 700; }
.footer-links { display: flex; gap: 26px; list-style: none; padding: 0; margin: 0; }
.footer-links a { font-size: .88rem; color: rgba(255,255,255,.6); }
.footer-links a:hover { color: var(--amber); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: .8rem;
}

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; max-width: 300px; margin: 0 auto 20px; }
  .about-grid { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .stat-strip .container { grid-template-columns: repeat(2, 1fr); row-gap: 24px; }
}

@media (max-width: 720px) {
  .nav-links, .nav-cta .btn-outline { display: none; }
  .nav-toggle { display: flex; }
  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 68px; left: 0; right: 0;
    background: var(--navy-dark);
    padding: 22px 28px;
    gap: 18px;
  }
  section { padding: 70px 0; }
  .hero { padding: 130px 0 80px; }
  .service-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 26px; }
}