:root { color-scheme: light; --ink: #18233b; --muted: #586477; --paper: #fbfaf5; --line: #d9d8cf; --accent: #244d70; --soft: #f1f4f3; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.85 system-ui, -apple-system, "Hiragino Kaku Gothic ProN", "Noto Sans JP", sans-serif; }
a { color: #174f80; text-underline-offset: .18em; }
.site-head, main, footer { width: min(100% - 36px, 780px); margin-inline: auto; }
.site-head { padding: 22px 0 14px; border-bottom: 1px solid var(--line); }
.site-head a { font-weight: 700; text-decoration: none; }
main { padding: 34px 0 52px; }
.eyebrow { color: var(--muted); font-size: .8rem; letter-spacing: .08em; }
h1 { margin: .2em 0 .35em; font-size: clamp(1.8rem, 5vw, 2.55rem); line-height: 1.4; }
h2 { margin: 2em 0 .5em; font-size: 1.35rem; line-height: 1.5; }
h3 { margin: 0 0 .35em; font-size: 1.04rem; }
.lead { color: #344057; font-size: 1.08rem; }
.note, .sample, .steps, .limit { margin: 1.2rem 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: #fff; }
.note { border-left: 4px solid var(--accent); background: var(--soft); }
.sample { overflow-wrap: anywhere; }
.sample pre { margin: .6em 0; white-space: pre-wrap; font: inherit; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { width: 9em; }
.steps ol { padding-left: 1.4em; margin-bottom: 0; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 2rem; }
.button { display: inline-block; padding: 10px 16px; border: 1px solid var(--accent); border-radius: 8px; color: white; background: var(--accent); font-weight: 700; text-decoration: none; }
.button.secondary { color: var(--accent); background: transparent; }
.article-list { display: grid; gap: 14px; padding: 0; list-style: none; }
.article-list li { padding: 18px 20px; border: 1px solid var(--line); border-radius: 12px; background: white; }
.article-list a { font-weight: 700; }
.article-list p { margin: .35em 0 0; color: var(--muted); }
footer { padding: 18px 0 28px; border-top: 1px solid var(--line); color: var(--muted); font-size: .92rem; }
footer p { margin: .35em 0; }
@media (max-width: 520px) { .site-head, main, footer { width: min(100% - 28px, 780px); } main { padding-top: 24px; } .note, .sample, .steps, .limit { padding: 14px; } th { width: 7em; } }