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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: #0f172a;
  color: #e5e7eb;
  line-height: 1.6;
}

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

.hero {
  min-height: 100vh;
  padding: 28px 8%;
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.35), transparent 35%),
    radial-gradient(circle at bottom right, rgba(168, 85, 247, 0.25), transparent 35%),
    #0f172a;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 130px;
}

.logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 1px;
}

.nav-links {
  display: flex;
  gap: 24px;
  font-size: 15px;
  color: #cbd5e1;
}

.nav-links a:hover {
  color: #ffffff;
}

.hero-content {
  max-width: 760px;
}

.tag {
  display: inline-block;
  padding: 8px 14px;
  margin-bottom: 22px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  border-radius: 999px;
  color: #93c5fd;
  background: rgba(15, 23, 42, 0.55);
}

h1 {
  font-size: clamp(42px, 8vw, 84px);
  line-height: 1.05;
  margin-bottom: 24px;
}

.desc {
  max-width: 660px;
  font-size: 19px;
  color: #cbd5e1;
  margin-bottom: 34px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.btn {
  padding: 13px 22px;
  border-radius: 14px;
  font-weight: 700;
  transition: 0.2s;
}

.btn:hover {
  transform: translateY(-3px);
}

.primary {
  background: #3b82f6;
  color: white;
}

.secondary {
  border: 1px solid rgba(148, 163, 184, 0.45);
  color: #e5e7eb;
}

.section {
  padding: 90px 8%;
}

.section-title {
  margin-bottom: 34px;
}

.section-title p,
.mini-title {
  color: #60a5fa;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-title h2,
.split h2 {
  font-size: 36px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.card {
  padding: 28px;
  border-radius: 24px;
  background: rgba(30, 41, 59, 0.78);
  border: 1px solid rgba(148, 163, 184, 0.18);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
  transition: 0.25s;
}

.card:hover {
  transform: translateY(-8px);
  border-color: rgba(96, 165, 250, 0.7);
}

.icon {
  font-size: 34px;
}

.card h3 {
  margin: 18px 0 10px;
  font-size: 21px;
}

.card p {
  color: #cbd5e1;
  font-size: 15px;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 38px;
  align-items: center;
  background: #111827;
}

.text {
  color: #cbd5e1;
  font-size: 18px;
  margin-top: 16px;
}

.note-box {
  padding: 30px;
  border-radius: 24px;
  background: #020617;
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.note-box h3 {
  margin-bottom: 16px;
}

.note-box ul {
  padding-left: 20px;
  color: #cbd5e1;
}

.note-box li {
  margin-bottom: 10px;
}

.timeline {
  display: grid;
  gap: 18px;
}

.timeline-item {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 20px;
  padding: 24px;
  border-radius: 22px;
  background: rgba(30, 41, 59, 0.72);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.timeline-item span {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: #2563eb;
  font-weight: 800;
}

.timeline-item h3 {
  margin-bottom: 6px;
}

.timeline-item p {
  color: #cbd5e1;
}

footer {
  padding: 26px 8%;
  text-align: center;
  color: #94a3b8;
  border-top: 1px solid rgba(148, 163, 184, 0.16);
}

@media (max-width: 1000px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 640px) {
  .navbar {
    margin-bottom: 90px;
  }

  .nav-links {
    display: none;
  }

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

  .section {
    padding: 70px 6%;
  }

  .timeline-item {
    grid-template-columns: 1fr;
  }
}