* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: #1f2937;
  background: #f8fafc;
  line-height: 1.6;
}

a {
  color: #0f766e;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255,255,255,0.96);
  border-bottom: 1px solid #e5e7eb;
  backdrop-filter: blur(8px);
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  min-height: 72px;
}

.brand {
  font-size: 24px;
  font-weight: 700;
  color: #0f172a;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

nav a {
  font-weight: 600;
  color: #334155;
}

.hero {
  padding: 88px 0 72px;
  background: linear-gradient(135deg, #ecfeff 0%, #eff6ff 100%);
  border-bottom: 1px solid #e5e7eb;
}

.hero-content {
  display: grid;
  gap: 24px;
}

.badge {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 999px;
  background: #ccfbf1;
  color: #115e59;
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 14px;
}

.hero h1 {
  margin: 0 0 14px;
  font-size: 44px;
  line-height: 1.1;
  color: #0f172a;
}

.hero p {
  max-width: 700px;
  font-size: 18px;
  color: #334155;
  margin: 0;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.section {
  padding: 72px 0;
}

.section.alt {
  background: #eef2f7;
}

.section h2 {
  margin: 0 0 12px;
  font-size: 34px;
  color: #0f172a;
}

.section-intro {
  margin: 0 0 28px;
  max-width: 820px;
  color: #475569;
}

.grid {
  display: grid;
  gap: 20px;
}

.grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.05);
}

.card h3 {
  margin-top: 0;
  margin-bottom: 10px;
  color: #0f172a;
}

.notice {
  background: #fff;
  border-left: 5px solid #0f766e;
  padding: 18px 20px;
  border-radius: 12px;
  margin-bottom: 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 12px;
  font-weight: 700;
  transition: transform 0.15s ease, opacity 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
  opacity: 0.95;
}

.btn.primary {
  background: #0f766e;
  color: #fff;
}

.btn.secondary {
  background: #fff;
  color: #0f172a;
  border: 1px solid #cbd5e1;
}

.footer {
  padding: 28px 0;
  border-top: 1px solid #e5e7eb;
  background: #fff;
  color: #475569;
}

@media (max-width: 900px) {
  .grid.two,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 34px;
  }

  .nav {
    flex-direction: column;
    justify-content: center;
    padding: 14px 0;
  }
}