/* ===================================================================
   Syntacto Vision — feuille de style
   =================================================================== */

:root {
  /* Palette — bleu acier industriel sur ardoise */
  --bg: #0b121c;
  --bg-2: #101a26;
  --panel: rgba(255, 255, 255, .03);
  --panel-solid: #131e2c;
  --border: rgba(148, 170, 200, .12);
  --border-strong: rgba(148, 170, 200, .22);
  --text: #e8eef6;
  --muted: #9aabc0;
  --muted-2: #6c7d92;

  --accent: #2f81d6;        /* bleu acier */
  --accent-2: #1e5fa8;      /* bleu profond */
  --accent-3: #4a90c2;      /* bleu-gris clair */
  --amber: #e0a338;         /* ambre signal (statut) */
  --green: #3f9d6f;         /* vert validation sobre */

  --grad-brand: linear-gradient(120deg, #4a90c2 0%, #2f81d6 50%, #1e5fa8 100%);
  --grad-soft: linear-gradient(135deg, rgba(47, 129, 214, .12), rgba(30, 95, 168, .10));

  --radius: 14px;
  --radius-lg: 20px;
  --shadow: 0 24px 60px -22px rgba(0, 0, 0, .7);
  --shadow-glow: 0 10px 32px -10px rgba(47, 129, 214, .4);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  position: relative;
}

/* Fond global : grille + halos colorés */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 600px at 12% -5%, rgba(47, 129, 214, .14), transparent 60%),
    radial-gradient(800px 600px at 95% 8%, rgba(74, 144, 194, .10), transparent 55%),
    radial-gradient(700px 700px at 60% 110%, rgba(30, 95, 168, .10), transparent 60%),
    var(--bg);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, .025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .025) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 100% 80% at 50% 0%, #000 30%, transparent 80%);
}

.container { width: min(1160px, 91%); margin: 0 auto; }
.container.narrow { width: min(660px, 91%); }

a { color: inherit; text-decoration: none; }
::selection { background: rgba(47, 129, 214, .4); color: #fff; }

/* ===================== Boutons ===================== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .55rem;
  padding: .85rem 1.6rem; border-radius: 12px; font-weight: 600; font-size: .95rem;
  border: 1px solid transparent; cursor: pointer; white-space: nowrap;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
  font-family: inherit;
}
.btn-sm { padding: .55rem 1.1rem; font-size: .88rem; }
.btn-lg { padding: 1.05rem 2.2rem; font-size: 1.05rem; }

.btn-primary {
  position: relative;
  background: var(--grad-brand);
  background-size: 160% 160%;
  color: #050810;
  box-shadow: var(--shadow-glow);
  animation: btnShift 6s var(--ease) infinite;
}
@keyframes btnShift { 0%,100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 44px -12px rgba(47, 129, 214, .55); }
.btn-primary:active { transform: translateY(-1px); }

.btn-ghost {
  background: rgba(255, 255, 255, .04);
  color: var(--text);
  border-color: var(--border-strong);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { background: rgba(255, 255, 255, .09); border-color: var(--accent); transform: translateY(-2px); }

/* ===================== Header ===================== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(6, 9, 18, .55);
  backdrop-filter: blur(16px) saturate(150%);
  border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: .65rem; font-weight: 800; font-size: 1.22rem; letter-spacing: -.02em; }
.brand-mark {
  width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px;
  background: var(--grad-brand); color: #050810; font-weight: 900; font-size: 1.05rem;
  box-shadow: var(--shadow-glow);
}
.brand-accent { background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; align-items: center; gap: 1.8rem; font-size: .94rem; color: var(--muted); }
.nav-links a:not(.btn) { position: relative; transition: color .2s ease; }
.nav-links a:not(.btn)::after {
  content: ""; position: absolute; left: 0; bottom: -5px; height: 2px; width: 0;
  background: var(--grad-brand); transition: width .25s var(--ease);
}
.nav-links a:not(.btn):hover { color: var(--text); }
.nav-links a:not(.btn):hover::after { width: 100%; }

/* ===================== Hero ===================== */
.hero { position: relative; padding: 7rem 0 5.5rem; text-align: center; }
.hero-glow {
  position: absolute; left: 50%; top: -10%; transform: translateX(-50%);
  width: 760px; height: 760px; pointer-events: none; z-index: 0;
  background: radial-gradient(closest-side, rgba(47, 129, 214, .22), transparent 70%);
  filter: blur(20px);
  animation: float 9s ease-in-out infinite;
}
@keyframes float { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(26px); } }

.hero-inner { position: relative; z-index: 1; max-width: 840px; margin: 0 auto; }

.badge {
  display: inline-flex; align-items: center; gap: .55rem; font-size: .82rem; font-weight: 600;
  color: var(--muted); background: rgba(255, 255, 255, .04); border: 1px solid var(--border-strong);
  padding: .45rem 1rem; border-radius: 999px; margin-bottom: 1.7rem; backdrop-filter: blur(8px);
}
.badge-amber { color: var(--amber); border-color: rgba(251, 191, 36, .3); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); position: relative; }
.dot::after {
  content: ""; position: absolute; inset: -4px; border-radius: 50%;
  background: var(--accent); opacity: .5; animation: ping 1.8s var(--ease) infinite;
}
.dot-amber { background: var(--amber); }
.dot-amber::after { background: var(--amber); }
@keyframes ping { 0% { transform: scale(.8); opacity: .6; } 80%,100% { transform: scale(2.4); opacity: 0; } }

.hero h1 {
  font-size: clamp(2.4rem, 6.2vw, 4.4rem); line-height: 1.04; font-weight: 800; letter-spacing: -.035em;
}
.grad { background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.22rem); margin: 1.5rem auto 2.3rem; max-width: 650px; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

.hero-meta {
  display: flex; gap: 3rem; justify-content: center; flex-wrap: wrap; margin-top: 4rem;
  padding-top: 2.2rem; border-top: 1px solid var(--border);
}
.hero-meta div { display: flex; flex-direction: column; gap: .15rem; }
.hero-meta strong { font-size: 1.2rem; background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 800; }
.hero-meta span { font-size: .85rem; color: var(--muted-2); }

/* ===================== Sections ===================== */
.section { padding: 5.5rem 0; position: relative; }
.section-alt { background: linear-gradient(180deg, rgba(255, 255, 255, .015), transparent); border-top: 1px solid var(--border); }
.section-title { font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 800; text-align: center; letter-spacing: -.03em; }
.section-sub { text-align: center; color: var(--muted); margin: 1rem auto 3.4rem; max-width: 580px; font-size: 1.05rem; }

/* ===================== Grilles / cartes ===================== */
.grid { display: grid; gap: 1.5rem; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.7rem;
  backdrop-filter: blur(10px);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
  overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: var(--grad-brand);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  opacity: 0; transition: opacity .3s var(--ease);
}
.card:hover { transform: translateY(-6px); background: rgba(255, 255, 255, .055); }
.card:hover::before { opacity: 1; }
.card-icon {
  width: 52px; height: 52px; display: grid; place-items: center; font-size: 1.6rem;
  border-radius: 13px; background: var(--grad-soft); border: 1px solid var(--border);
  margin-bottom: 1.1rem;
}
.card h3 { font-size: 1.18rem; margin-bottom: .5rem; letter-spacing: -.02em; }
.card p { color: var(--muted); font-size: .95rem; }

.feature {
  position: relative; background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 2rem 1.8rem; overflow: hidden;
  backdrop-filter: blur(10px);
  transition: transform .3s var(--ease), border-color .3s var(--ease), background .3s var(--ease);
}
.feature:hover { transform: translateY(-4px); border-color: var(--border-strong); background: rgba(255, 255, 255, .05); }
.feature-num {
  font-size: 2.6rem; font-weight: 800; line-height: 1;
  background: var(--grad-brand); -webkit-background-clip: text; background-clip: text; color: transparent;
  opacity: .25; position: absolute; top: 1rem; right: 1.3rem;
}
.feature h3 { font-size: 1.12rem; margin-bottom: .5rem; letter-spacing: -.02em; padding-right: 2.5rem; }
.feature p { color: var(--muted); font-size: .95rem; }

/* ===================== Démo box ===================== */
.demo-box {
  display: grid; grid-template-columns: 1.5fr 1fr; gap: 2.8rem; align-items: center;
  position: relative;
  background: linear-gradient(135deg, rgba(255, 255, 255, .05), rgba(255, 255, 255, .015));
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  padding: 3.2rem; overflow: hidden; box-shadow: var(--shadow);
}
.demo-box::before {
  content: ""; position: absolute; width: 420px; height: 420px; right: -120px; top: -140px;
  background: radial-gradient(closest-side, rgba(74, 144, 194, .16), transparent 70%); pointer-events: none;
}
.demo-text { position: relative; z-index: 1; }
.demo-text h2 { font-size: clamp(1.5rem, 3vw, 2rem); margin: 1rem 0; letter-spacing: -.03em; }
.demo-text p { color: var(--muted); }
.check-list { list-style: none; margin-top: 1.5rem; display: grid; gap: .8rem; }
.check-list li { position: relative; padding-left: 2rem; color: var(--text); }
.check-list li::before {
  content: "✓"; position: absolute; left: 0; top: 0; width: 1.4rem; height: 1.4rem;
  display: grid; place-items: center; border-radius: 50%; font-size: .75rem; font-weight: 800;
  color: #050810; background: var(--green);
}

.roadmap {
  position: relative; z-index: 1;
  background: rgba(6, 9, 18, .6); border: 1px solid var(--border-strong); border-radius: var(--radius);
  padding: 1.7rem; backdrop-filter: blur(10px);
}
.roadmap h4 { margin-bottom: 1.1rem; font-size: .82rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted-2); }
.road-item { display: flex; align-items: center; gap: .8rem; padding: .6rem 0; color: var(--muted); font-size: .95rem; }
.road-item span { width: 13px; height: 13px; border-radius: 50%; border: 2px solid var(--border-strong); flex: none; }
.road-item.done { color: var(--text); font-weight: 500; }
.road-item.done span { background: var(--green); border-color: var(--green); box-shadow: 0 0 10px rgba(52, 211, 153, .7); }

/* ===================== Carte de téléchargement ===================== */
.download-card {
  position: relative;
  background: linear-gradient(135deg, rgba(255, 255, 255, .06), rgba(255, 255, 255, .02));
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg);
  padding: 2.5rem; box-shadow: var(--shadow); backdrop-filter: blur(12px);
}
.download-card label { display: block; font-weight: 600; margin-bottom: .8rem; font-size: .98rem; }
.input-row { display: flex; gap: .75rem; }
.input-row input {
  flex: 1; padding: .95rem 1.1rem; border-radius: 12px; border: 1px solid var(--border-strong);
  background: rgba(6, 9, 18, .6); color: var(--text); font-size: 1rem; font-family: inherit;
  transition: border-color .2s ease, box-shadow .2s ease;
}
.input-row input::placeholder { color: var(--muted-2); }
.input-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px rgba(47, 129, 214, .18); }
.input-row input.invalid { border-color: #f87171; box-shadow: 0 0 0 4px rgba(248, 113, 113, .15); }
.form-hint { color: var(--muted-2); font-size: .85rem; margin-top: 1rem; line-height: 1.5; }
.form-msg { margin-top: 1rem; font-size: .92rem; font-weight: 500; min-height: 1.2em; }
.form-msg.error { color: #fca5a5; }
.form-msg.ok { color: var(--green); }

.download-success { text-align: center; margin-top: 1.8rem; padding-top: 2rem; border-top: 1px solid var(--border); animation: rise .45s var(--ease); }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: translateY(0); } }
.success-icon {
  width: 60px; height: 60px; margin: 0 auto 1.1rem; border-radius: 50%; display: grid; place-items: center;
  font-size: 1.7rem; font-weight: 800; color: #050810;
  background: linear-gradient(135deg, var(--green), #6ee7b7);
  box-shadow: 0 0 0 8px rgba(52, 211, 153, .12);
}
.download-success h3 { margin-bottom: .4rem; font-size: 1.25rem; }
.download-success p { color: var(--muted); margin-bottom: 1.4rem; }

/* ===================== Footer ===================== */
.site-footer { border-top: 1px solid var(--border); padding: 3.5rem 0; background: rgba(255, 255, 255, .01); }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: .6rem; text-align: center; }
.footer-inner p { color: var(--muted); font-size: .92rem; }
.muted { color: var(--muted-2); }

/* ===================== Apparition au scroll ===================== */
@media (prefers-reduced-motion: no-preference) {
  .card, .feature, .demo-box, .download-card { animation: fadeUp .6s var(--ease) both; }
  .grid-4 .card:nth-child(2), .grid-3 .feature:nth-child(2) { animation-delay: .08s; }
  .grid-4 .card:nth-child(3), .grid-3 .feature:nth-child(3) { animation-delay: .16s; }
  .grid-4 .card:nth-child(4) { animation-delay: .24s; }
  .grid-3 .feature:nth-child(4) { animation-delay: .1s; }
  .grid-3 .feature:nth-child(5) { animation-delay: .18s; }
  .grid-3 .feature:nth-child(6) { animation-delay: .26s; }
}
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }

/* ===================== Responsive ===================== */
@media (max-width: 900px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .demo-box { grid-template-columns: 1fr; padding: 2.2rem; }
}
@media (max-width: 600px) {
  .nav-links a:not(.btn) { display: none; }
  .grid-4, .grid-3 { grid-template-columns: 1fr; }
  .input-row { flex-direction: column; }
  .hero { padding: 4.5rem 0 3.5rem; }
  .hero-meta { gap: 1.8rem; }
  .download-card { padding: 1.8rem; }
}