/* KERVYNA — landing V1 (coming soon). Palette provisoire : aucune charte graphique dédiée
   n'est gravée à ce jour pour cette marque (docs/strategy/source_de_verite/marques/STOCK-SWING/
   VISION_PRODUIT.md ne fixe aucune couleur). Bleu/gris neutres retenus volontairement pour ne
   pas donner l'impression visuelle d'être le même site que kortixa.com (vert lime signature
   Kortixa). À remplacer dès qu'une charte KERVYNA officielle est gravée. */

:root {
  --kervyna-bg: #0b0e14;
  --kervyna-surface: #131722;
  --kervyna-surface-2: #1a1f2c;
  --kervyna-accent: #4f7cff;
  --kervyna-white: #f2f4f8;
  --kervyna-grey: #8b93a7;
  --kervyna-border: rgba(242, 244, 248, 0.08);

  --container: 1120px;
  --radius: 14px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --space-6: 6rem;

  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--kervyna-bg);
  color: var(--kervyna-white);
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* Subtle brand background: faint grid + radial glow, never a candlestick/arrow motif. */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--kervyna-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--kervyna-border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 90%);
  opacity: 0.5;
}

.bg-glow {
  position: fixed;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 900px;
  height: 900px;
  z-index: -1;
  background: radial-gradient(circle, rgba(79, 124, 255, 0.12) 0%, transparent 65%);
  pointer-events: none;
}

/* ---------- Header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(11, 14, 20, 0.72);
  border-bottom: 1px solid var(--kervyna-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  text-decoration: none;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--kervyna-accent);
  color: var(--kervyna-bg);
  font-weight: 700;
  font-size: 1rem;
}

.brand-name {
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

.nav-links {
  display: none;
  gap: var(--space-4);
  font-size: 0.9rem;
  color: var(--kervyna-grey);
}

.nav-links a {
  text-decoration: none;
  transition: color 0.15s ease;
}

.nav-links a:hover {
  color: var(--kervyna-white);
}

@media (min-width: 900px) {
  .nav-links {
    display: flex;
  }
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease;
  white-space: nowrap;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: var(--kervyna-accent);
  color: var(--kervyna-white);
}

.btn-primary:hover {
  background: #6b91ff;
}

.btn-ghost {
  background: transparent;
  border-color: var(--kervyna-border);
  color: var(--kervyna-white);
}

.btn-ghost:hover {
  border-color: rgba(242, 244, 248, 0.28);
}

.btn-sm {
  padding: 0.6rem 1.1rem;
  font-size: 0.85rem;
}

/* ---------- Hero ---------- */

.hero {
  padding: var(--space-6) 0 var(--space-5);
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--kervyna-border);
  background: transparent;
  color: var(--kervyna-grey);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
  opacity: 0.85;
}

.hero-tag .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--kervyna-accent);
}

.hero-wordmark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: clamp(60px, 8vw, 72px);
  height: clamp(60px, 8vw, 72px);
  border-radius: 16px;
  background: var(--kervyna-accent);
  color: var(--kervyna-white);
  font-weight: 700;
  font-size: clamp(1.8rem, 3.6vw, 2.2rem);
  margin: 0 auto var(--space-2);
}

.hero-subtitle {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  font-weight: 600;
  color: var(--kervyna-grey);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 auto var(--space-3);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 auto var(--space-3);
  max-width: 820px;
  font-weight: 650;
}

.hero p.lead {
  color: var(--kervyna-grey);
  font-size: clamp(1rem, 2vw, 1.15rem);
  max-width: 620px;
  margin: 0 auto var(--space-4);
}

.hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-2);
}

.hero-disclaimer {
  color: var(--kervyna-grey);
  font-size: 0.8rem;
  max-width: 480px;
  margin: var(--space-3) auto 0;
}

/* ---------- Sections ---------- */

section {
  padding: var(--space-5) 0;
}

.section-head {
  max-width: 640px;
  margin: 0 auto var(--space-4);
  text-align: center;
}

.eyebrow {
  color: var(--kervyna-accent);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: var(--space-1);
}

.section-head h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  margin: 0 0 var(--space-1);
  font-weight: 650;
}

.section-head p {
  color: var(--kervyna-grey);
  margin: 0;
}

/* ---------- Card grid (Ce que KERVYNA propose / n'est pas) ---------- */

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 720px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  background: var(--kervyna-surface);
  border: 1px solid var(--kervyna-border);
  border-radius: var(--radius);
  padding: var(--space-4);
}

.card h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.card h3 .marker {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  flex: none;
}

.marker-yes {
  background: var(--kervyna-accent);
}

.marker-no {
  background: var(--kervyna-grey);
}

.card p {
  color: var(--kervyna-grey);
  margin: 0;
  font-size: 0.95rem;
}

.card-full {
  grid-column: 1 / -1;
}

/* ---------- Steps (Comment ça fonctionne) ---------- */

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  counter-reset: step;
}

@media (min-width: 640px) {
  .steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .steps {
    grid-template-columns: repeat(5, 1fr);
  }
}

.step {
  background: var(--kervyna-surface);
  border: 1px solid var(--kervyna-border);
  border-radius: var(--radius);
  padding: var(--space-3);
  position: relative;
}

.step-index {
  counter-increment: step;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--kervyna-accent);
  margin-bottom: var(--space-2);
}

.step-index::before {
  content: "0" counter(step);
}

.step h3 {
  font-size: 0.98rem;
  margin: 0 0 0.4rem;
}

.step p {
  font-size: 0.85rem;
  color: var(--kervyna-grey);
  margin: 0;
}

/* ---------- Univers ---------- */

.note-neutral {
  text-align: center;
  color: var(--kervyna-grey);
  font-size: 0.9rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ---------- Technologie ---------- */

.tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

@media (min-width: 720px) {
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .tech-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.tech-card {
  padding: var(--space-3);
  border: 1px solid var(--kervyna-border);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--kervyna-surface), var(--kervyna-surface-2));
}

.tech-card .num {
  color: var(--kervyna-accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.tech-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.tech-card p {
  margin: 0;
  color: var(--kervyna-grey);
  font-size: 0.85rem;
}

/* ---------- CTA final ---------- */

.cta-final {
  text-align: center;
  padding: var(--space-6) 0;
}

.cta-final .card {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-5) var(--space-4);
}

.cta-final h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 var(--space-2);
}

.cta-final p {
  color: var(--kervyna-grey);
  margin: 0 0 var(--space-3);
}

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--kervyna-border);
  padding: var(--space-4) 0;
  color: var(--kervyna-grey);
  font-size: 0.8rem;
}

.footer-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

@media (min-width: 720px) {
  .footer-grid {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.footer-links a {
  text-decoration: none;
  color: var(--kervyna-grey);
}

.footer-links a:hover {
  color: var(--kervyna-white);
}

/* ---------- Reveal-on-scroll (progressive enhancement, no dependency) ---------- */

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* ---------- Small screens polish ---------- */

@media (max-width: 480px) {
  .hero-ctas .btn {
    width: 100%;
  }

  .hero-ctas {
    flex-direction: column;
  }
}