/* K4sstoo Corporate — Style principal */
:root {
  --bg: #0a0a0a;
  --bg-card: #111111;
  --bg-card-hover: #1a1a1a;
  --text: #e8e8e8;
  --text-muted: #888;
  --accent: #4f8cff;
  --accent-hover: #6da0ff;
  --border: #222;
  --radius: 12px;
  --max-w: 1100px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

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

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-hover); }

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

/* ─── Header / Nav ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,10,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .5px;
  color: var(--text);
}
.logo span { color: var(--accent); }

.nav-links { display: flex; gap: 28px; list-style: none; }
.nav-links a {
  color: var(--text-muted);
  font-size: .9rem;
  font-weight: 500;
  transition: color .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); }

.nav-toggle { display: none; background: none; border: none; color: var(--text); cursor: pointer; font-size: 1.5rem; }

/* ─── Hero ─── */
.hero {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 100px 24px 80px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 32px;
}

.hero-cta {
  display: inline-flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-weight: 600;
  font-size: .95rem;
  transition: all .2s;
  border: none;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); }
.btn-outline { border: 1px solid var(--border); color: var(--text); background: transparent; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ─── Sections ─── */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 24px;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 48px;
  max-width: 560px;
}

.section-divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0 auto;
  max-width: var(--max-w);
}

/* ─── Cards / Grid ─── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all .25s;
}
.card:hover {
  background: var(--bg-card-hover);
  border-color: #333;
  transform: translateY(-2px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.card p {
  color: var(--text-muted);
  font-size: .95rem;
  line-height: 1.5;
  margin-bottom: 16px;
}

.card-links { display: flex; gap: 12px; flex-wrap: wrap; }
.card-link {
  font-size: .85rem;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: all .2s;
}
.card-link:hover { border-color: var(--accent); color: var(--accent); }

/* ─── Activity domains ─── */
.domains {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  text-align: center;
}

.domain-item {
  padding: 40px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color .2s;
}
.domain-item:hover { border-color: #333; }
.domain-item .icon { font-size: 2.4rem; margin-bottom: 16px; }
.domain-item h3 { font-size: 1.1rem; margin-bottom: 8px; }
.domain-item p { color: var(--text-muted); font-size: .9rem; }

/* ─── Page header (sous-pages) ─── */
.page-header {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 80px 24px 40px;
}
.page-header h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-header p { color: var(--text-muted); font-size: 1.1rem; }

/* ─── Product detail ─── */
.product {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
  margin-bottom: 64px;
}
.product-info h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 8px; }
.product-info .tagline { color: var(--accent); font-size: .95rem; margin-bottom: 16px; }
.product-info p { color: var(--text-muted); margin-bottom: 16px; }
.product-features { list-style: none; margin-bottom: 24px; }
.product-features li {
  padding: 6px 0;
  color: var(--text-muted);
  font-size: .92rem;
}
.product-features li::before {
  content: '\2713';
  color: var(--accent);
  margin-right: 10px;
  font-weight: 700;
}

.product-visual {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  font-size: 4rem;
}

/* ─── Contact form ─── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-info h3 { font-size: 1.2rem; margin-bottom: 24px; }
.contact-item { margin-bottom: 20px; }
.contact-item .label { color: var(--text-muted); font-size: .85rem; margin-bottom: 4px; }
.contact-item .value { font-size: 1rem; }

/* ─── Legal ─── */
.legal-content { max-width: 720px; }
.legal-content h2 { font-size: 1.3rem; margin: 32px 0 12px; }
.legal-content p { color: var(--text-muted); margin-bottom: 12px; }

/* ─── Footer ─── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 24px;
  margin-top: 80px;
}

.footer-container {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-copy { color: var(--text-muted); font-size: .85rem; }
.footer-links { display: flex; gap: 20px; list-style: none; }
.footer-links a { color: var(--text-muted); font-size: .85rem; }
.footer-links a:hover { color: var(--text); }

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 16px 24px;
    gap: 16px;
  }
  .nav-toggle { display: block; }

  .domains { grid-template-columns: 1fr; }
  .product { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }

  .hero { padding: 60px 24px 48px; }
  .section { padding: 48px 24px; }
}

@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
}