/* layout: single readable column (max 720px), sticky slim header, figures centered at phone width */
:root {
  --bg: #F3F5F8; --surface: #FFFFFF; --ink: #17202B; --muted: #5E6B7A; --line: #DCE2E9;
  --ai: #1F3A5F; --ai-soft: #E3EAF3; --on-ai: #FFFFFF;
  --red: #B8321F; --red-soft: #FBE7E3; --amber: #9A5B00; --amber-soft: #FDF0D9;
  --violet: #5B3F99; --violet-soft: #ECE6F7; --green: #2E6B46; --green-soft: #E3F1E8;
  --f-body: "Zen Kaku Gothic New", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;
  --f-display: "Shippori Mincho B1", "Hiragino Mincho ProN", "Yu Mincho", serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F1520; --surface: #182130; --ink: #E7ECF2; --muted: #9AA7B6; --line: #2A3546;
    --ai: #8FB2DE; --ai-soft: #22334A; --on-ai: #0F1520;
    --red: #F08A78; --red-soft: #3A1E1B; --amber: #F2B65B; --amber-soft: #352914;
    --violet: #B9A2EC; --violet-soft: #2A2340; --green: #7FC79A; --green-soft: #17301F; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 72px; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--f-body); font-size: 16px; line-height: 1.8; }
a { color: var(--ai); }
.bar { position: sticky; top: 0; z-index: 5; background: var(--surface); border-bottom: 1px solid var(--line); }
.bar-in { max-width: 720px; margin: 0 auto; padding: calc(10px + env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left)); display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; color: inherit; text-decoration: none; }
.brand-mark { width: 36px; height: 36px; border-radius: 9px; background: var(--ai); color: var(--on-ai); display: grid; place-items: center; font-family: var(--f-display); font-size: 20px; }
.brand b { font-family: var(--f-display); font-size: 19px; letter-spacing: .06em; display: block; line-height: 1.2; }
.brand small { font-size: 12px; color: var(--muted); display: block; line-height: 1.2; }
.open { flex: none; background: var(--ai); color: var(--on-ai); text-decoration: none; font-weight: 700; font-size: 14px; padding: 8px 14px; border-radius: 9px; }
main { max-width: 720px; margin: 0 auto; padding: 24px max(16px, env(safe-area-inset-right)) 64px max(16px, env(safe-area-inset-left)); display: grid; gap: 14px; }
h1 { font-family: var(--f-display); font-size: 30px; line-height: 1.35; margin: 0; text-wrap: balance; letter-spacing: .02em; }
h2 { font-size: 21px; line-height: 1.4; margin: 28px 0 0; padding-top: 18px; border-top: 1px solid var(--line); text-wrap: balance; }
h3 { font-size: 17px; margin: 10px 0 0; }
p, ul, ol, dl { margin: 0; }
ul, ol { padding-left: 1.4em; display: grid; gap: 6px; }
.lead { font-size: 17px; }
.ui { display: inline-block; padding: 0 7px; margin: 0 1px; border-radius: 6px; background: var(--surface); border: 1px solid var(--line); font-weight: 700; font-size: .92em; line-height: 1.6; white-space: nowrap; }
.tip { background: var(--amber-soft); border-radius: 10px; padding: 10px 14px; font-size: 15px; }
.note { background: var(--ai-soft); border-radius: 10px; padding: 10px 14px; font-size: 15px; }
.toc { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; }
.toc ol { gap: 2px; }
.rolecards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 10px; }
.rolecards a { display: grid; gap: 4px; padding: 14px 16px; border-radius: 12px; border: 2px solid var(--ai); color: inherit; text-decoration: none; background: var(--surface); line-height: 1.6; }
.rolecards b { font-size: 17px; color: var(--ai); }
.rolecards span { font-size: 14px; color: var(--muted); }
.steps { list-style: none; padding: 0; display: grid; gap: 10px; counter-reset: s; }
.steps > li { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px 12px 52px; position: relative; counter-increment: s; }
.steps > li::before { content: counter(s); position: absolute; left: 14px; top: 13px; width: 26px; height: 26px; border-radius: 13px; background: var(--ai); color: var(--on-ai); display: grid; place-items: center; font-weight: 700; font-size: 14px; line-height: 1; }
.steps > li > b:first-child { display: block; }
figure { margin: 6px 0; display: grid; justify-items: center; gap: 6px; }
figure img { display: block; width: 100%; max-width: 300px; height: auto; border: 1px solid var(--line); border-radius: 14px; }
figcaption { font-size: 13px; color: var(--muted); text-align: center; }
.figs { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.figs figure { flex: 1 1 220px; max-width: 300px; }
.tbl { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; background: var(--surface); border-radius: 12px; overflow: hidden; font-size: 15px; line-height: 1.6; }
th, td { border-bottom: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
th { background: var(--bg); font-size: 13px; color: var(--muted); }
td.c, th.c { text-align: center; white-space: nowrap; }
.chip { display: inline-block; padding: 1px 9px; border-radius: 99px; font-size: 13px; font-weight: 700; }
.c-red { background: var(--red-soft); color: var(--red); } .c-amber { background: var(--amber-soft); color: var(--amber); }
.c-violet { background: var(--violet-soft); color: var(--violet); } .c-green { background: var(--green-soft); color: var(--green); }
.c-grey { background: var(--bg); color: var(--muted); border: 1px solid var(--line); }
dl { display: grid; gap: 4px; }
dt { font-weight: 700; margin-top: 10px; }
dd { margin: 0; color: var(--ink); }
.next { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; margin-top: 18px; }
.next a { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; text-decoration: none; font-weight: 700; }
footer { max-width: 720px; margin: 0 auto; padding: 0 max(16px, env(safe-area-inset-right)) calc(32px + env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left)); font-size: 13px; color: var(--muted); }
:focus-visible { outline: 3px solid var(--ai); outline-offset: 2px; }