.header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 72px;

  padding-left: 20px;
  padding-right: 30px;

  display: flex;
  align-items: center;
  justify-content: space-between;

  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);

  z-index: 1000;
}

.logo img {
  height: 350px;
  width: auto;
  display: block;
}

.nav {
  display: flex;
  gap: 30px;
}

.nav a {
  text-decoration: none;
  color: #111827;
  font-size: 15px;
  font-weight: 600;
}
.left-nav {
  display: flex;
  align-items: center;
  gap: 40px;
}
.right-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
.login-link {
  text-decoration: none;
  color: #111827;
  font-weight: 600;
}
.demo-btn {
  text-decoration: none;
  background: #2563eb;
  color: white;

  padding: 12px 20px;
  border-radius: 999px;

  font-weight: 600;
}

.hero {
  position: relative;
  min-height: 100vh;
  padding: 180px 56px 120px;
  background:
    linear-gradient(rgba(5, 12, 25, 0.62), rgba(5, 12, 25, 0.72)),
    url("../images/plant.jpg") center/cover no-repeat;
  color: white;
  overflow: hidden;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.35;
}

.hero::after {
  content: "";
  position: absolute;
  right: -140px;
  bottom: -120px;
  width: 620px;
  height: 620px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 50%;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 980px;
}

.index-eyebrow {
  color: #93c5fd;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2.5px;
  margin-bottom: 24px;
}

h1 {
  font-size: 66px;
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -1px;
  margin-bottom: 28px;
}

.subtitle {
  max-width: 680px;
  font-size: 21px;
  line-height: 1.6;
  color: #dbeafe;
  margin-bottom: 42px;
}

.buttons {
  display: flex;
  gap: 16px;
}

.btn {
  display: inline-block;
  padding: 15px 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}

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

.secondary {
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: white;
}

.section {
  padding: 120px 56px;
  background: white;
}

.section-label {
  color: #2563eb;
  font-weight: 800;
  margin-bottom: 16px;
}

.section h2,
.contact h2 {
  font-size: 44px;
  letter-spacing: -1.5px;
  max-width: 850px;
  margin-bottom: 22px;
}

.section > p {
  max-width: 760px;
  color: #4b5563;
  font-size: 18px;
  line-height: 1.7;
}

.cards {
  margin-top: 56px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.card {
  padding: 34px;
  border: 1px solid #e5e7eb;
  border-radius: 22px;
  background: #f9fafb;
}

.card h3 {
  margin-bottom: 14px;
  font-size: 21px;
}

.card p {
  color: #4b5563;
  line-height: 1.6;
}

.contact {
  padding: 110px 56px;
  background: #0f172a;
  color: white;
}

.contact p {
  color: #cbd5e1;
  font-size: 18px;
  margin-bottom: 32px;
}

@media (max-width: 768px) {
  .header {
    padding: 0 22px;
  }

  .nav {
    display: none;
  }

  .hero {
    padding: 150px 24px 90px;
  }

  h1 {
    font-size: 42px;
  }

  .subtitle {
    font-size: 17px;
  }

  .buttons {
    flex-direction: column;
  }

  .section,
  .contact {
    padding: 80px 24px;
  }

  .section h2,
  .contact h2 {
    font-size: 32px;
  }

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