:root {
  --ink: #17202a;
  --muted: #52606d;
  --line: #d9e2ec;
  --paper: #ffffff;
  --mist: #f5f8fb;
  --teal: #0f766e;
  --deep: #0b2437;
  --radius: 8px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--mist);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", "Noto Sans JP", sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

a { color: inherit; }

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

.nav {
  max-width: 960px;
  margin: 0 auto;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-weight: 800;
  color: var(--deep);
  text-decoration: none;
}

.nav a:not(.brand) {
  color: var(--muted);
  font-size: 14px;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 40px 18px 56px;
}

.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px;
}

.eyebrow {
  display: inline-flex;
  border-radius: 999px;
  background: #e6fffb;
  color: #075e57;
  padding: 4px 10px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 14px;
}

h1 {
  margin: 0;
  color: var(--deep);
  font-size: 32px;
  line-height: 1.35;
  letter-spacing: 0;
}

h2 {
  margin: 34px 0 10px;
  color: var(--deep);
  font-size: 22px;
  line-height: 1.45;
  letter-spacing: 0;
}

p {
  margin: 12px 0 0;
  color: var(--muted);
}

ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 12px;
  background: white;
}

th, td {
  border: 1px solid var(--line);
  padding: 12px;
  text-align: left;
  vertical-align: top;
}

th {
  width: 30%;
  background: #eef5f7;
  color: var(--deep);
}

.notice {
  margin-top: 20px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fbfdff;
}

.fine-print {
  font-size: 13px;
  color: var(--muted);
}

.footer {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 18px 36px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 640px) {
  .nav {
    display: grid;
    align-items: start;
  }

  .panel {
    padding: 24px 16px;
  }

  h1 {
    font-size: 26px;
  }

  table {
    display: block;
    overflow-x: auto;
  }
}