:root {
  --brand: #0a6ebd;
  --brand-dark: #073b6f;
  --accent: #00a5a5;
  --bg: #f3f7fb;
  --card: #ffffff;
  --stroke: #e1e9f1;
  --text: #0e1b26;
  --muted: #5a6b7b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #4fb6f5;
    --brand-dark: #0b1420;
    --accent: #3fd7d0;
    --bg: #0b1420;
    --card: #16232f;
    --stroke: #263647;
    --text: #f2f7fb;
    --muted: #9fb2c2;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

header.hero {
  background: linear-gradient(160deg, #073b6f 0%, #0a6ebd 55%, #00a5a5 100%);
  color: #fff;
  padding: 56px 24px 48px;
  text-align: center;
}

header.hero .mark {
  width: 84px; height: 84px;
  border-radius: 22px;
  background: rgba(255,255,255,0.16);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 40px; margin-bottom: 16px;
}

header.hero h1 { margin: 0 0 8px; font-size: 2rem; font-weight: 800; letter-spacing: -0.02em; }
header.hero p  { margin: 0 auto; max-width: 620px; opacity: 0.92; }

nav {
  background: var(--card);
  border-bottom: 1px solid var(--stroke);
  padding: 12px 24px;
  text-align: center;
  position: sticky; top: 0; z-index: 10;
}
nav a {
  color: var(--brand);
  text-decoration: none;
  font-weight: 600;
  margin: 0 12px;
  font-size: 0.94rem;
}
nav a:hover { text-decoration: underline; }

main {
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 24px 72px;
}

section.card {
  background: var(--card);
  border: 1px solid var(--stroke);
  border-radius: 16px;
  padding: 24px 28px;
  margin-bottom: 20px;
}

h2 { margin-top: 0; font-size: 1.35rem; letter-spacing: -0.01em; }
h3 { font-size: 1.05rem; margin-bottom: 6px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 0.92rem; }

ul { padding-left: 20px; }
li { margin-bottom: 6px; }

a { color: var(--brand); }

table { width: 100%; border-collapse: collapse; margin: 12px 0; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--stroke); font-size: 0.94rem; }
th { color: var(--muted); font-weight: 600; }

.pill {
  display: inline-block;
  background: rgba(10,110,189,0.12);
  color: var(--brand);
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.78rem;
  font-weight: 700;
}

.notice {
  background: rgba(232,106,75,0.10);
  border-left: 4px solid #e86a4b;
  padding: 14px 18px;
  border-radius: 10px;
  margin: 18px 0;
}

footer {
  text-align: center;
  padding: 32px 24px 48px;
  color: var(--muted);
  font-size: 0.86rem;
}
footer a { color: var(--muted); }