@import url('https://fonts.googleapis.com/css2?family=Shippori+Mincho+B1:wght@600;800&family=Noto+Sans+JP:wght@400;500&family=Tiny5&display=swap');

:root {
  --brand: #1C3FD4;
  --ink: #0F0F0E;
  --ink-muted: #5F5F59;
  --surface: #F4F1E9;
  --border: #E0E0D8;
  --font-serif: 'Shippori Mincho B1', serif;
  --font-sans: 'Noto Sans JP', sans-serif;
  --font-logo: 'Tiny5', monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --brand: #D4FF00;
    --ink: #F0F0E8;
    --ink-muted: #A3A39A;
    --surface: #111110;
    --border: #282826;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding-inline: 20px;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.9;
}

a { color: var(--brand); text-underline-offset: 3px; }
a:hover { text-decoration: none; }

.wrap { max-width: 720px; margin: 0 auto; }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 20px;
  border-bottom: 1px solid var(--border);
}

.logo {
  font-family: var(--font-logo);
  font-size: 1.05rem;
  letter-spacing: 0.05em;
  color: var(--surface);
  background: var(--brand);
  padding: 0 0.5em;
  text-decoration: none;
}

.nav { display: flex; gap: 20px; font-size: 0.875rem; }
.nav a { color: var(--ink); text-decoration: none; }
.nav a:hover { color: var(--brand); }

main { padding-block: 56px 72px; }

h1, h2, h3 { font-family: var(--font-serif); line-height: 1.5; }
h1 { font-size: clamp(1.75rem, 6vw, 2.25rem); font-weight: 800; margin: 0 0 16px; }
h2 { font-size: 1.25rem; font-weight: 600; margin: 48px 0 12px; }
h3 { font-size: 1rem; font-weight: 600; margin: 28px 0 8px; }

p { margin: 0 0 16px; }
ul { margin: 0 0 16px; padding-left: 1.4em; }
li { margin-bottom: 6px; }

.lead { color: var(--ink-muted); }
.meta { color: var(--ink-muted); font-size: 0.8125rem; }

.card {
  display: block;
  margin-top: 16px;
  padding: 20px 24px;
  border: 1px solid var(--border);
  color: var(--ink);
  text-decoration: none;
}
.card:hover { border-color: var(--brand); }
.card-title { font-family: var(--font-serif); font-weight: 600; font-size: 1.125rem; }
.card-desc { color: var(--ink-muted); margin: 4px 0 0; }

.table-scroll { overflow-x: auto; }
.examples { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
.examples th, .examples td {
  text-align: left;
  padding: 8px 12px 8px 0;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.examples th { font-weight: 500; font-size: 0.8125rem; color: var(--ink-muted); }
.examples .kanji { font-family: var(--font-serif); font-size: 1.125rem; font-weight: 600; }

.button {
  display: inline-block;
  margin-top: 8px;
  padding: 10px 20px;
  background: var(--brand);
  color: var(--surface);
  font-weight: 500;
  text-decoration: none;
}
.button:hover { opacity: 0.85; }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 24px 40px;
  border-top: 1px solid var(--border);
  font-size: 0.8125rem;
  color: var(--ink-muted);
}
.site-footer a { color: var(--ink-muted); }
.footer-links { display: flex; gap: 20px; }