:root {
  --ink: #243236;
  --muted: #5d7177;
  --soft: #eef7f6;
  --line: #dbe9e7;
  --brand: #2f8794;
  --brand-dark: #17616d;
  --leaf: #4f9f6b;
  --sun: #f6b44b;
  --paper: #ffffff;
  --page: #f7fbfa;
}

* {
  box-sizing: border-box;
}

html {
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

body {
  margin: 0;
  background: var(--page);
}

a {
  color: var(--brand-dark);
  font-weight: 700;
  text-decoration-color: rgba(23, 97, 109, 0.28);
  text-underline-offset: 3px;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(246, 180, 75, 0.72);
  outline-offset: 3px;
}

.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner,
.main,
.footer-inner {
  margin: 0 auto;
  max-width: 960px;
  padding: 0 24px;
}

.header-inner {
  align-items: center;
  display: flex;
  gap: 20px;
  justify-content: space-between;
  min-height: 76px;
}

.brand {
  align-items: center;
  color: var(--ink);
  display: inline-flex;
  gap: 12px;
  text-decoration: none;
}

.brand img {
  border-radius: 14px;
  height: 44px;
  width: 44px;
}

.brand-title {
  display: block;
  font-size: 18px;
  font-weight: 800;
}

.brand-subtitle {
  color: var(--muted);
  display: block;
  font-size: 13px;
  font-weight: 650;
}

.nav {
  align-items: center;
  display: flex;
  gap: 8px;
}

.nav a {
  border-radius: 8px;
  color: var(--brand-dark);
  padding: 8px 10px;
  text-decoration: none;
}

.nav a:hover {
  background: var(--soft);
}

.main {
  padding-bottom: 56px;
  padding-top: 40px;
}

.intro {
  margin-bottom: 32px;
  max-width: 760px;
}

.intro h1 {
  font-size: clamp(32px, 5vw, 52px);
  letter-spacing: 0;
  line-height: 1.05;
  margin: 0 0 16px;
}

.intro p {
  color: var(--muted);
  font-size: 18px;
  margin: 0;
  max-width: 680px;
}

.section {
  margin-top: 32px;
}

.section h2 {
  font-size: 24px;
  margin: 0 0 14px;
}

.grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}

.card h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.card p,
.card li {
  color: var(--muted);
}

.card p {
  margin: 0;
}

.card ul {
  margin: 0;
  padding-left: 20px;
}

.notice {
  background: #fff8ec;
  border: 1px solid #f5d9a7;
  border-radius: 8px;
  margin-top: 22px;
  padding: 18px;
}

.notice h2 {
  font-size: 18px;
  margin: 0 0 8px;
}

.notice p {
  color: #6e5731;
  margin: 0;
}

.steps {
  counter-reset: step;
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.step {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 6px;
  grid-template-columns: 36px minmax(0, 1fr);
  padding: 16px;
}

.step::before {
  align-items: center;
  background: var(--leaf);
  border-radius: 999px;
  color: white;
  content: counter(step);
  counter-increment: step;
  display: flex;
  font-weight: 800;
  height: 30px;
  justify-content: center;
  width: 30px;
}

.step h3 {
  font-size: 16px;
  margin: 2px 0 0;
}

.step p {
  color: var(--muted);
  grid-column: 2;
  margin: 0;
}

.site-footer {
  background: var(--paper);
  border-top: 1px solid var(--line);
}

.footer-inner {
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
  padding-bottom: 24px;
  padding-top: 24px;
}

.footer-links {
  display: flex;
  gap: 14px;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
    padding-bottom: 16px;
    padding-top: 16px;
  }

  .nav {
    flex-wrap: wrap;
  }

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

  .main {
    padding-top: 28px;
  }
}