* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  background: #f6f7fb;
  color: #141824;
}

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

.site-header {
  background: radial-gradient(circle at top right, #dce7ff, transparent 35%), linear-gradient(135deg, #0f172a, #1e293b);
  color: white;
  min-height: 680px;
}

.nav {
  max-width: 1160px;
  margin: 0 auto;
  padding: 28px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.04em;
}

.logo span {
  color: #8dd3ff;
}

.nav-links {
  display: flex;
  gap: 24px;
  color: #dbeafe;
  font-size: 15px;
}

.hero {
  max-width: 1160px;
  margin: 0 auto;
  padding: 90px 24px 120px;
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 44px;
  align-items: center;
}

.eyebrow {
  color: #3b82f6;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 800;
}

.site-header .eyebrow {
  color: #93c5fd;
}

h1 {
  font-size: clamp(42px, 7vw, 76px);
  line-height: 0.95;
  letter-spacing: -0.07em;
  margin: 14px 0 24px;
}

.hero-desc {
  color: #dbeafe;
  max-width: 650px;
  font-size: 19px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  gap: 14px;
  margin-top: 32px;
}

.btn {
  padding: 14px 20px;
  border-radius: 16px;
  font-weight: 700;
}

.primary {
  background: white;
  color: #0f172a;
}

.secondary {
  border: 1px solid rgba(255, 255, 255, 0.26);
  color: white;
}

.hero-card {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 30px;
  padding: 28px;
  backdrop-filter: blur(14px);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.24);
}

.status-row {
  display: flex;
  gap: 10px;
  align-items: center;
  color: #dcfce7;
  font-size: 14px;
}

.status-dot {
  width: 10px;
  height: 10px;
  background: #22c55e;
  border-radius: 50%;
  box-shadow: 0 0 18px #22c55e;
}

.hero-card h3 {
  font-size: 24px;
  margin: 24px 0 14px;
}

.hero-card ul {
  padding-left: 20px;
  color: #e0f2fe;
  line-height: 2;
}

.section {
  max-width: 1160px;
  margin: 0 auto;
  padding: 86px 24px;
}

.section-head {
  max-width: 720px;
  margin-bottom: 34px;
}

.section h2 {
  font-size: clamp(32px, 5vw, 54px);
  letter-spacing: -0.05em;
  margin: 8px 0 12px;
}

.section-head p {
  color: #64748b;
  font-size: 17px;
  line-height: 1.6;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.card {
  background: white;
  padding: 26px;
  border-radius: 26px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 18px 50px rgba(15, 23, 42, 0.06);
}

.card h3 {
  margin-top: 0;
  font-size: 22px;
}

.card p {
  color: #64748b;
  line-height: 1.6;
}

.card span {
  display: block;
  margin-top: 22px;
  color: #2563eb;
  font-size: 14px;
  font-weight: 700;
}

.dark {
  max-width: none;
  background: #0f172a;
  color: white;
  padding-left: max(24px, calc((100vw - 1160px) / 2 + 24px));
  padding-right: max(24px, calc((100vw - 1160px) / 2 + 24px));
}

.dark .section-head p {
  color: #cbd5e1;
}

.model-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  max-width: 1160px;
}

.model-item {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 22px;
  padding: 24px;
}

.model-item strong {
  font-size: 22px;
}

.model-item p {
  color: #cbd5e1;
  line-height: 1.6;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.guide {
  background: white;
  border-radius: 26px;
  padding: 28px;
  border: 1px solid #e5e7eb;
  transition: transform .2s ease, box-shadow .2s ease;
}

.guide:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.08);
}

.guide span {
  color: #2563eb;
  font-weight: 800;
}

.guide h3 {
  font-size: 22px;
}

.guide p {
  color: #64748b;
  line-height: 1.6;
}

.faq details {
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  padding: 22px;
  margin-bottom: 14px;
}

.faq summary {
  cursor: pointer;
  font-weight: 800;
}

.faq p {
  color: #64748b;
  line-height: 1.6;
}

footer {
  text-align: center;
  padding: 36px 24px;
  background: #0f172a;
  color: #cbd5e1;
}

@media (max-width: 900px) {
  .hero,
  .grid,
  .model-list,
  .guide-grid {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    gap: 18px;
    flex-direction: column;
  }

  .nav-links {
    flex-wrap: wrap;
  }

  .site-header {
    min-height: auto;
  }
}