:root { color-scheme: dark; --bg: #161826; --surface: #232532; --text: #e9e9ed; --muted: #b2b6ca; --accent: #d2cefd; --line: rgba(233,233,237,.16); }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.9 system-ui, -apple-system, "Noto Sans JP", "Meiryo", sans-serif; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: #fff; }
:focus-visible { outline: 2px solid #9184d9; outline-offset: 4px; }
.wrap { width: min(920px, calc(100% - 40px)); margin-inline: auto; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; justify-content: space-between; align-items: center; min-height: 68px; gap: 20px; font-size: 13px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); font-size: 18px; font-weight: 600; text-decoration: none; }
.brand img { width: 28px; height: 28px; object-fit: contain; }
main { padding: 44px 0 72px; overflow-wrap: anywhere; }
h1 { margin: 0 0 12px; font-size: clamp(25px, 4.5vw, 36px); line-height: 1.5; }
.lead { margin: 0 0 32px; color: var(--muted); }
.toc { display: flex; flex-wrap: wrap; gap: 8px 20px; padding: 20px; border: 1px solid var(--line); border-radius: 10px; font-size: 13px; }
h2 { margin: 48px 0 16px; padding-bottom: 10px; border-bottom: 1px solid var(--line); font-size: 22px; line-height: 1.6; }
h3 { margin: 30px 0 10px; font-size: 18px; line-height: 1.7; }
p, ul, ol { margin: 0 0 16px; }
ul, ol { padding-left: 1.6em; }
li + li { margin-top: 6px; }
li > ol, li > ul { margin-top: 8px; }
hr { margin: 36px 0; border: 0; border-top: 1px solid var(--line); }
table { display: block; width: 100%; overflow-x: auto; border-collapse: collapse; margin-bottom: 24px; font-size: 13px; }
th, td { min-width: 130px; padding: 12px; text-align: left; vertical-align: top; border: 1px solid var(--line); }
th { background: var(--surface); }
.contact-card { padding: 24px; border-radius: 12px; background: var(--surface); }
.contact-card h2 { margin-top: 0; }
.email { display: inline-block; margin: 8px 0 20px; font-size: clamp(19px, 4vw, 26px); }
dl { display: grid; grid-template-columns: 110px minmax(0, 1fr); gap: 12px 24px; }
dt { color: var(--muted); }
dd { margin: 0; }
footer { padding: 26px 0 38px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
footer nav { display: flex; flex-wrap: wrap; gap: 10px 22px; }
footer p { margin: 20px 0 0; }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; padding: 8px 12px; background: var(--surface); }
@media (max-width: 480px) { .wrap { width: calc(100% - 32px); } main { padding-top: 30px; } h2 { font-size: 20px; } .contact-card { padding: 18px; } dl { grid-template-columns: 1fr; gap: 4px; } dd { margin-bottom: 12px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }