:root {
  color-scheme: light;
  --background: #f4f7fb;
  --surface: #ffffff;
  --text: #182230;
  --muted: #526173;
  --accent: #2457a6;
  --border: #d7e0ea;
  --todo-bg: #fff8dd;
  --todo-border: #d49b00;
}

* { box-sizing: border-box; }

html { font-size: 16px; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.75;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 3px solid #f2b400; outline-offset: 3px; }

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

.header-inner,
main,
.footer-inner {
  width: min(100% - 32px, 760px);
  margin-inline: auto;
}

.header-inner { padding: 18px 0; }
.brand { margin: 0 0 10px; font-size: 1.2rem; font-weight: 700; }
.site-nav { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.site-nav a[aria-current="page"] { color: var(--text); font-weight: 700; text-decoration: none; }

main {
  margin-block: 28px;
  padding: clamp(22px, 5vw, 48px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 8px 28px rgb(28 45 67 / 7%);
}

h1 { margin: 0 0 8px; font-size: clamp(1.7rem, 5vw, 2.35rem); line-height: 1.35; }
h2 { margin-top: 2.2em; font-size: 1.35rem; line-height: 1.45; }
h3 { margin-top: 1.7em; font-size: 1.1rem; }
p, li { overflow-wrap: anywhere; }
.plain-url { overflow-wrap: anywhere; }
.updated { margin-top: 0; color: var(--muted); }
.todo {
  margin: 20px 0;
  padding: 14px 16px;
  background: var(--todo-bg);
  border-left: 5px solid var(--todo-border);
}
.contact-list { padding-left: 1.2rem; }
.page-links { margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--border); }
.site-footer { color: var(--muted); }
.footer-inner { padding: 0 0 32px; }

@media (max-width: 520px) {
  .header-inner, main, .footer-inner { width: min(100% - 20px, 760px); }
  main { margin-block: 12px; padding: 20px 16px 28px; border-radius: 12px; }
  .site-nav { gap: 10px 14px; }
}

@media print {
  body { background: #fff; }
  .site-header, .site-footer { display: none; }
  main { width: 100%; margin: 0; padding: 0; border: 0; box-shadow: none; }
  a { color: inherit; }
}