/* ============================================================
   YDNOVA GROUP — design tokens (extraits du logo / background)
   ============================================================ */
:root {
  --navy-900: #00152C;
  --navy-800: #002A52;
  --navy-700: #0B3B6B;
  --blue-600: #0B6FB8;
  --cyan-500: #02ABEE;
  --cyan-400: #07C0FF;
  --slate-500: #5A6B80;
  --paper: #F6F9FC;
  --white: #FFFFFF;
  --line: rgba(0, 42, 82, 0.12);

  --font-head: "Space Grotesk", "Segoe UI", sans-serif;
  --font-body: "Inter", "Segoe UI", sans-serif;

  --wrap: 1180px;
  --radius: 4px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--navy-900);
  font-family: var(--font-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
h1, h2, h3 { font-family: var(--font-head); margin: 0; color: var(--navy-800); }

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

/* progress bar */
.progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: linear-gradient(90deg, var(--cyan-500), var(--cyan-400));
  z-index: 1000; transition: width .12s linear;
}

/* ---------------- buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 0.92rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .18s ease, background .18s ease, border-color .18s ease, color .18s ease;
}
.btn-primary {
  background: linear-gradient(120deg, var(--cyan-500), var(--blue-600));
  color: var(--white);
}
.btn-primary:hover { transform: translateY(-2px); }
.btn-ghost {
  color: var(--white);
  border-color: rgba(255,255,255,0.45);
}
.btn-ghost:hover { border-color: var(--white); background: rgba(255,255,255,0.08); }
.btn-outline {
  color: var(--navy-800);
  border-color: var(--line);
  padding: 10px 20px;
}
.btn-outline:hover { border-color: var(--cyan-500); color: var(--cyan-500); }

/* ---------------- header ---------------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  background: rgba(246, 249, 252, 0);
  border-bottom: 1px solid transparent;
  transition: background .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}
.site-header.scrolled,
.site-header.nav-open {
  background: rgba(246, 249, 252, 0.96);
  backdrop-filter: blur(10px);
  border-bottom-color: var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  height: 76px;
}
.brand {
  display: flex; align-items: center; height: 44px;
  background: var(--white);
  border-radius: var(--radius);
  padding: 6px 10px;
  box-shadow: 0 6px 18px -10px rgba(0,0,0,0.35);
}
.brand-logo { height: 100%; width: auto; object-fit: contain; }
.main-nav { display: flex; gap: 32px; margin-left: auto; }
.main-nav a {
  font-family: var(--font-head);
  font-size: 0.92rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  position: relative;
  padding: 4px 0;
  transition: color .2s ease;
}
.main-nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--cyan-400); transition: width .2s ease;
}
.main-nav a:hover::after,
.main-nav a.active::after { width: 100%; }
.main-nav a.active { color: var(--cyan-400); font-weight: 600; }
.nav-cta { margin-left: 12px; white-space: nowrap; color: var(--white); border-color: rgba(255,255,255,0.5); }
.nav-cta:hover { border-color: var(--cyan-400); color: var(--cyan-400); }
.nav-toggle {
  display: none; position: relative; flex-shrink: 0;
  width: 34px; height: 34px; background: none; border: none; cursor: pointer; padding: 0;
}
.nav-toggle span {
  position: absolute; left: 6px; right: 6px; height: 2px;
  background: var(--white); border-radius: 2px;
  transition: top .32s cubic-bezier(.65,0,.35,1), transform .32s cubic-bezier(.65,0,.35,1),
              opacity .2s ease, background .2s ease;
}
.nav-toggle span:nth-child(1) { top: 11px; }
.nav-toggle span:nth-child(2) { top: 16px; }
.nav-toggle span:nth-child(3) { top: 21px; }
.site-header.nav-open .nav-toggle span:nth-child(1) { top: 16px; transform: rotate(45deg); }
.site-header.nav-open .nav-toggle span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.site-header.nav-open .nav-toggle span:nth-child(3) { top: 16px; transform: rotate(-45deg); }

/* once the header has an opaque backdrop (scrolled, or menu open on mobile), switch to dark text */
.site-header.scrolled .main-nav a,
.site-header.nav-open .main-nav a { color: var(--navy-800); }
.site-header.scrolled .main-nav a::after,
.site-header.nav-open .main-nav a::after { background: var(--cyan-500); }
.site-header.scrolled .main-nav a.active,
.site-header.nav-open .main-nav a.active { color: var(--cyan-500); }
.site-header.scrolled .nav-cta { color: var(--navy-800); border-color: var(--line); }
.site-header.scrolled .nav-cta:hover { border-color: var(--cyan-500); color: var(--cyan-500); }
.site-header.scrolled .nav-toggle span,
.site-header.nav-open .nav-toggle span { background: var(--navy-800); }

/* ---------------- hero ---------------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
  background: var(--navy-900);
}
.hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
  opacity: 0.5;
  transform: scale(1.05);
}
.hero-overlay {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(0,21,44,0.55) 0%, rgba(0,21,44,0.86) 68%, var(--navy-900) 100%),
    linear-gradient(100deg, rgba(0,21,44,0.65) 0%, rgba(0,21,44,0.15) 55%, rgba(0,21,44,0.65) 100%);
}
.hero-inner {
  position: relative; z-index: 2;
  padding-top: 96px; padding-bottom: 140px;
  max-width: 780px;
}
.eyebrow {
  font-family: var(--font-head);
  color: var(--cyan-400);
  letter-spacing: 0.06em;
  font-size: 0.85rem;
  font-weight: 600;
  margin: 0 0 18px;
}
.hero-title {
  color: var(--white);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.05;
  font-weight: 700;
  margin-bottom: 22px;
}
.hero-desc {
  color: rgba(255,255,255,0.82);
  font-size: 1.08rem;
  max-width: 560px;
  margin-bottom: 36px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-edge {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 90px;
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 100%, 100% 35%, 62% 100%, 38% 20%, 0 68%);
}

/* reveal animation */
.reveal { opacity: 0; transform: translateY(22px); }
.reveal.in {
  animation: reveal-up .7s cubic-bezier(.22,.68,.36,1) forwards;
}
.hero-title.reveal.in { animation-delay: .08s; }
.hero-desc.reveal.in { animation-delay: .18s; }
.hero-actions.reveal.in { animation-delay: .28s; }
@keyframes reveal-up {
  to { opacity: 1; transform: translateY(0); }
}
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
[data-reveal].in { opacity: 1; transform: translateY(0); }

/* ---------------- sections ---------------- */
.section { padding: 108px 0; }
.section-head {
  display: flex; align-items: baseline; gap: 18px;
  margin-bottom: 18px;
}
.section-index {
  font-family: var(--font-head);
  color: var(--cyan-500);
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px 13px;
}
.section-head h2 {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
}
.section-lede {
  color: var(--slate-500);
  font-size: 1.05rem;
  max-width: 560px;
  margin: 0 0 52px;
}

/* about */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 64px;
  align-items: start;
}
.about-text {
  font-size: 1.2rem;
  color: var(--navy-800);
  line-height: 1.6;
  border-left: 2px solid var(--cyan-500);
  padding-left: 24px;
}
.about-pillars { display: flex; flex-direction: column; gap: 28px; }
.about-pillars li { display: flex; gap: 18px; padding-top: 22px; border-top: 1px solid var(--line); }
.about-pillars li:first-child { padding-top: 0; border-top: none; }
.pillar-num {
  font-family: var(--font-head); font-weight: 700; color: var(--cyan-500);
  font-size: 0.95rem; min-width: 30px;
}
.about-pillars h3 { font-size: 1.05rem; margin-bottom: 6px; }
.about-pillars p { margin: 0; color: var(--slate-500); font-size: 0.96rem; }

/* software */
.software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.software-card {
  background: var(--white);
  padding: 34px 30px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
  transition: background .2s ease, transform .2s ease, box-shadow .2s ease;
}
.software-card:hover { background: linear-gradient(180deg, var(--white), var(--paper)); }
.software-card.is-linked { cursor: pointer; }
.software-card.is-linked:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 34px -22px rgba(0, 42, 82, 0.35);
  z-index: 1;
}
.software-card.is-linked:focus-visible {
  outline: 2px solid var(--cyan-500); outline-offset: -2px;
}
.software-card-top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.software-num {
  font-family: var(--font-head); color: var(--slate-500); font-size: 0.82rem; font-weight: 600;
}
.status-badge {
  font-family: var(--font-head); font-size: 0.72rem; font-weight: 600;
  padding: 4px 10px; border-radius: 999px; letter-spacing: 0.02em;
  border: 1px solid var(--line); color: var(--navy-800);
}
.status-badge[data-status="En ligne"] { color: #0A8A4C; border-color: rgba(10,138,76,0.3); background: rgba(10,138,76,0.06); }
.status-badge[data-status="Bêta"] { color: var(--blue-600); border-color: rgba(11,111,184,0.3); background: rgba(11,111,184,0.06); }
.status-badge[data-status="En développement"] { color: var(--slate-500); }
.software-thumb {
  width: 100%; aspect-ratio: 16/9; border-radius: var(--radius);
  background: linear-gradient(135deg, var(--navy-800), var(--blue-600) 55%, var(--cyan-400));
  object-fit: cover;
}
.software-card h3 { font-size: 1.2rem; }
.software-tagline { color: var(--cyan-500); font-family: var(--font-head); font-size: 0.85rem; font-weight: 600; margin: -8px 0 0; }
.software-desc { color: var(--slate-500); font-size: 0.94rem; margin: 0; flex-grow: 1; }
.software-link {
  font-family: var(--font-head); font-weight: 600; font-size: 0.88rem; color: var(--navy-800);
  display: inline-flex; align-items: center; gap: 6px; margin-top: 6px;
}
.software-link::after { content: "→"; transition: transform .18s ease; }
.software-link:hover::after { transform: translateX(4px); }

/* team */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 40px;
}
.team-card { text-align: left; }
.team-photo-wrap {
  width: 100%; aspect-ratio: 4/5; border-radius: var(--radius);
  overflow: hidden; margin-bottom: 20px;
  background: linear-gradient(160deg, var(--navy-800), var(--blue-600));
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.team-photo-wrap img { width: 100%; height: 100%; object-fit: cover; }
.team-initials {
  font-family: var(--font-head); color: var(--white); font-size: 2.6rem; font-weight: 700;
  opacity: 0.9;
}
.team-photo-wrap::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 4px;
  background: linear-gradient(90deg, var(--cyan-500), var(--cyan-400));
}
.team-card { display: block; transition: transform .2s ease; }
.team-card h3 { font-size: 1.15rem; margin-bottom: 4px; }
.team-role { font-family: var(--font-head); color: var(--cyan-500); font-size: 0.85rem; font-weight: 600; margin-bottom: 12px; }
.team-bio { color: var(--slate-500); font-size: 0.94rem; margin: 0 0 12px; }
.team-card.is-linked { cursor: pointer; }
.team-card.is-linked:hover { transform: translateY(-3px); }
.team-card.is-linked:hover .team-photo-wrap { box-shadow: 0 18px 34px -20px rgba(0, 42, 82, 0.45); }
.team-card.is-linked:focus-visible { outline: 2px solid var(--cyan-500); outline-offset: 4px; }
.team-card .software-link { font-size: 0.85rem; }

/* contact */
.contact { background: var(--navy-900); }
.contact .section-index { border-color: rgba(255,255,255,0.2); color: var(--cyan-400); }
.contact .section-head h2, .contact .about-text { color: var(--white); }
.contact-grid {
  display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 64px; align-items: center;
}
.contact .section-lede { color: rgba(255,255,255,0.65); }
.contact-list { display: flex; flex-direction: column; gap: 20px; margin-bottom: 28px; }
.contact-list li { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 16px; display: flex; flex-direction: column; gap: 4px; }
.contact-list li:first-child { border-top: none; padding-top: 0; }
.contact-label { font-family: var(--font-head); font-size: 0.78rem; color: var(--cyan-400); font-weight: 600; letter-spacing: 0.04em; }
.contact-list a, .contact-list span:not(.contact-label) { color: var(--white); font-size: 1.02rem; }
.contact-list a:hover { color: var(--cyan-400); }
.social-row { display: flex; gap: 14px; }
.social-row a {
  border: 1px solid rgba(255,255,255,0.2); color: var(--white);
  padding: 8px 16px; border-radius: 999px; font-family: var(--font-head); font-size: 0.82rem; font-weight: 600;
}
.social-row a:hover { border-color: var(--cyan-400); color: var(--cyan-400); }
.contact-panel {
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  padding: 48px 36px;
  text-align: center;
  background: linear-gradient(160deg, rgba(11,111,184,0.15), rgba(2,171,238,0.05));
}
.contact-mark { width: 96px; margin: 0 auto 20px; border-radius: 8px; }
.contact-panel p {
  font-family: var(--font-head); color: var(--white); font-size: 1.3rem; font-weight: 600; line-height: 1.35; margin: 0;
}

/* footer */
.site-footer { background: var(--navy-900); border-top: 1px solid rgba(255,255,255,0.1); padding: 32px 0; }
.footer-inner {
  display: flex; align-items: center; gap: 28px; flex-wrap: wrap; justify-content: space-between;
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-logo { height: 34px; width: auto; border-radius: 4px; }
.footer-brand span { font-family: var(--font-head); color: var(--white); font-weight: 600; font-size: 0.95rem; }
.footer-nav { display: flex; gap: 22px; }
.footer-nav a { color: rgba(255,255,255,0.65); font-size: 0.88rem; }
.footer-nav a:hover { color: var(--cyan-400); }
.footer-copy { color: rgba(255,255,255,0.45); font-size: 0.82rem; margin: 0; }

/* ---------------- responsive ---------------- */
@media (max-width: 900px) {
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .contact-panel { order: -1; }
}

@media (max-width: 720px) {
  .nav-cta { display: none; }
  .nav-toggle { display: block; }

  .main-nav {
    flex-direction: column; gap: 0;
    position: absolute; top: 76px; left: 0; right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    padding: 0 28px;
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    pointer-events: none;
    box-shadow: 0 24px 32px -22px rgba(0, 21, 44, 0.28);
    transition: max-height .45s cubic-bezier(.65,0,.35,1),
                opacity .3s ease,
                padding .45s cubic-bezier(.65,0,.35,1);
  }
  .site-header.nav-open .main-nav {
    max-height: 420px;
    opacity: 1;
    pointer-events: auto;
    padding: 8px 28px 20px;
  }
  .main-nav a {
    padding: 14px 0; border-bottom: 1px solid var(--line);
    opacity: 0; transform: translateY(-8px);
    transition: opacity .3s ease, transform .3s ease;
  }
  .site-header.nav-open .main-nav a {
    opacity: 1; transform: translateY(0);
  }
  .site-header.nav-open .main-nav a:nth-child(1) { transition-delay: .08s; }
  .site-header.nav-open .main-nav a:nth-child(2) { transition-delay: .14s; }
  .site-header.nav-open .main-nav a:nth-child(3) { transition-delay: .2s; }
  .site-header.nav-open .main-nav a:nth-child(4) { transition-delay: .26s; }

  .section { padding: 76px 0; }
  .hero-inner { padding-top: 120px; padding-bottom: 110px; }
  .footer-inner { flex-direction: column; align-items: flex-start; gap: 18px; }
}