:root {
  --bg: #f8fbfb;
  --paper: #ffffff;
  --ink: #111517;
  --muted: #5c6770;
  --line: #d8e0df;
  --accent: #0f766e;
  --blue: #255f85;
  --max: 1080px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.8;
}

a { color: inherit; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(248, 251, 251, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.nav {
  width: min(var(--max), calc(100% - 40px));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  font-weight: 850;
  font-size: 21px;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 20px;
  font-size: 14px;
  color: var(--muted);
}

.nav-links a {
  flex: 0 0 auto;
  text-decoration: none;
  white-space: nowrap;
}

.hero {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 86px 0 64px;
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 56px;
  align-items: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(38px, 7vw, 76px);
  line-height: 1.02;
  letter-spacing: 0;
}

.hero p {
  margin: 24px 0 0;
  font-size: 18px;
  color: var(--muted);
}

.hero img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
}

.section,
.page {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
  padding: 70px 0;
}

.page {
  max-width: 880px;
}

.section h2,
.page h1 {
  margin: 0 0 18px;
  font-size: clamp(30px, 5vw, 52px);
  line-height: 1.14;
}

.lead {
  color: var(--muted);
  font-size: 18px;
  max-width: 800px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 34px;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  text-decoration: none;
}

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

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  margin: 28px 0;
}

th,
td {
  border: 1px solid var(--line);
  padding: 14px;
  text-align: left;
  vertical-align: top;
}

th {
  background: #eaf3f2;
}

.note {
  border-left: 4px solid var(--accent);
  background: #eaf3f2;
  padding: 18px 20px;
  margin: 28px 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 30px 0;
  font-size: 14px;
}

.footer-inner {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

@media (max-width: 820px) {
  .nav,
  .hero {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: flex-start;
  }

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

  .nav-links {
    width: 100%;
    flex-wrap: wrap;
    overflow-x: visible;
    column-gap: 16px;
    row-gap: 4px;
  }
}