* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f6f8fc;
  color: #132033;
}

.nav {
  height: 76px;
  padding: 0 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
  border-bottom: 1px solid #e3e8f2;
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-mark {
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, #0ea5e9, #2563eb);
  color: white;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 800;
}

.brand span {
  display: block;
  font-size: 12px;
  color: #667085;
}

.nav nav {
  display: flex;
  gap: 22px;
  align-items: center;
}

.nav a {
  text-decoration: none;
  color: #334155;
  font-weight: 600;
  font-size: 14px;
}

.login-btn {
  background: #0f172a;
  color: white !important;
  padding: 10px 16px;
  border-radius: 999px;
}

.hero {
  min-height: 620px;
  padding: 80px 40px;
  display: grid;
  grid-template-columns: 1.4fr 0.8fr;
  gap: 40px;
  align-items: center;
  background:
    radial-gradient(circle at top right, #dbeafe, transparent 30%),
    linear-gradient(180deg, #ffffff, #f6f8fc);
}

.tag,
.section-tag {
  color: #0284c7;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 12px;
}

.hero h1 {
  font-size: 58px;
  line-height: 1.05;
  margin: 14px 0;
  max-width: 850px;
}

.hero p {
  font-size: 18px;
  color: #536173;
  line-height: 1.7;
  max-width: 760px;
}

.hero-actions {
  margin-top: 30px;
  display: flex;
  gap: 14px;
}

.primary,
.secondary {
  text-decoration: none;
  padding: 14px 20px;
  border-radius: 16px;
  font-weight: 800;
}

.primary {
  background: #2563eb;
  color: white;
}

.secondary {
  background: white;
  color: #0f172a;
  border: 1px solid #d8e1ef;
}

.hero-card {
  background: #0f172a;
  color: white;
  border-radius: 28px;
  padding: 28px;
  box-shadow: 0 20px 60px rgba(15, 23, 42, 0.25);
}

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

.metric {
  padding: 18px 0;
  border-top: 1px solid rgba(255,255,255,0.12);
}

.metric span {
  display: block;
  color: #94a3b8;
  font-size: 13px;
}

.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 24px;
}

.section {
  padding: 80px 40px;
  max-width: 1280px;
  margin: 0 auto;
}

.section h2 {
  font-size: 40px;
  margin: 10px 0 30px;
}

.grid {
  display: grid;
  gap: 22px;
}

.cards {
  grid-template-columns: repeat(4, 1fr);
}

.card,
.demo-card,
.blueprint-box {
  background: white;
  border: 1px solid #e3e8f2;
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.05);
}

.card h3,
.demo-card h3,
.blueprint-box h3 {
  margin-top: 0;
}

.card p,
.demo-card p,
.blueprint-box li,
.split p {
  color: #5b6778;
  line-height: 1.6;
}

.dark {
  max-width: none;
  background: #0f172a;
  color: white;
}

.dark h2 {
  max-width: 900px;
}

.demo-grid {
  max-width: 1280px;
  margin: 0 auto;
  grid-template-columns: repeat(3, 1fr);
}

.demo-card {
  background: #111c31;
  color: white;
  border-color: rgba(255,255,255,0.08);
}

.demo-card span {
  color: #38bdf8;
  font-weight: 800;
}

.demo-card p {
  color: #b6c3d8;
}

.demo-card a {
  display: inline-block;
  margin-top: 14px;
  color: white;
  background: #2563eb;
  text-decoration: none;
  padding: 12px 16px;
  border-radius: 14px;
  font-weight: 800;
}

.split {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: start;
}

.blueprint-box {
  border-left: 6px solid #2563eb;
}

footer {
  padding: 40px;
  text-align: center;
  background: #0f172a;
  color: white;
}

footer p {
  color: #94a3b8;
}

@media (max-width: 1000px) {
  .hero,
  .split {
    grid-template-columns: 1fr;
  }

  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 42px;
  }
}

@media (max-width: 700px) {
  .nav {
    height: auto;
    padding: 18px;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .nav nav {
    flex-wrap: wrap;
  }

  .hero,
  .section {
    padding: 48px 20px;
  }

  .cards {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 36px;
  }
}