:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --text: #1d1f22;
  --muted: #646a73;
  --border: #e0ddd6;
  --accent: #b5562a;
  --accent-soft: #fbeee6;
  --accent-text: #ffffff;
  --code-bg: #efece6;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #16181b;
    --surface: #1f2226;
    --text: #e9eaec;
    --muted: #a0a6ae;
    --border: #353a41;
    --accent: #e58a57;
    --accent-soft: #2e231c;
    --accent-text: #16181b;
    --code-bg: #2a2e33;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #16181b;
  --surface: #1f2226;
  --text: #e9eaec;
  --muted: #a0a6ae;
  --border: #353a41;
  --accent: #e58a57;
  --accent-soft: #2e231c;
  --accent-text: #16181b;
  --code-bg: #2a2e33;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.85 system-ui, -apple-system, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", sans-serif;
}
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
img { max-width: 100%; }

.wrap { max-width: 760px; margin: 0 auto; padding-inline: 16px; }

.site-head { border-bottom: 1px solid var(--border); background: var(--surface); }
.site-head .wrap { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding-block: 12px; }
.logo { font-weight: 700; color: var(--text); text-decoration: none; letter-spacing: .02em; }
.logo span { color: var(--accent); }
.site-nav { margin-left: auto; display: flex; gap: 14px; font-size: 14px; }
.site-nav a { color: var(--muted); text-decoration: none; }
.site-nav a:hover { color: var(--text); }

main { padding-block: 28px 56px; }
h1 { font-size: clamp(24px, 5vw, 32px); line-height: 1.4; margin: 0 0 12px; text-wrap: balance; letter-spacing: .01em; }
h2 { font-size: 20px; line-height: 1.5; margin: 40px 0 10px; padding-top: 12px; border-top: 1px solid var(--border); text-wrap: balance; }
p, ul, ol, table { margin: 0 0 16px; }
li { margin: 4px 0; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .9em; background: var(--code-bg); padding: 1px 6px; border-radius: 4px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; display: block; overflow-x: auto; }
th, td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; }
thead th { background: var(--code-bg); }
tbody th, thead th { white-space: nowrap; }

.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.meta { font-size: 13px; color: var(--muted); margin-bottom: 20px; }
.lead { font-size: 17px; color: var(--muted); }

.cta {
  margin: 28px 0; padding: 18px; border-radius: 12px;
  background: var(--accent-soft); border: 1px solid var(--accent);
}
.cta p { margin: 0 0 12px; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 10px; font-weight: 700;
  background: var(--accent); color: var(--accent-text); text-decoration: none;
}
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }

ul.check { list-style: none; padding-left: 0; }
ul.check li { padding-left: 1.6em; position: relative; }
ul.check li::before { content: "□"; position: absolute; left: 0; color: var(--accent); }

.guide-list { list-style: none; padding: 0; display: grid; gap: 10px; }
.guide-list a {
  display: block; padding: 14px 16px; border-radius: 12px; text-decoration: none;
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
}
.guide-list a:hover { border-color: var(--accent); }
.guide-list strong { display: block; line-height: 1.5; }
.guide-list span { display: block; font-size: 13px; color: var(--muted); margin-top: 4px; line-height: 1.6; }

.hero { padding-block: 8px 12px; }
.hero .actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.steps { counter-reset: s; list-style: none; padding: 0; display: grid; gap: 10px; }
.steps li { counter-increment: s; padding: 12px 14px 12px 52px; position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.steps li::before {
  content: counter(s); position: absolute; left: 14px; top: 12px; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: var(--accent-text); font-weight: 700; font-size: 14px; display: grid; place-items: center;
  font-variant-numeric: tabular-nums;
}

.sources { font-size: 14px; }
.note { font-size: 14px; color: var(--muted); padding: 12px 14px; border-radius: 10px; background: var(--code-bg); }

.site-foot { border-top: 1px solid var(--border); background: var(--surface); font-size: 13px; color: var(--muted); }
.site-foot .wrap { padding-block: 24px; display: grid; gap: 10px; }
.site-foot nav { display: flex; gap: 14px; flex-wrap: wrap; }
.site-foot a { color: var(--muted); }

.story { max-width: 34em; padding-block: 12px 8px; }
.story .eyebrow { font-size: 13px; letter-spacing: .12em; color: var(--accent); font-weight: 700; margin: 0 0 8px; }
.story h1 { margin-bottom: 36px; }
.story p { font-size: 17px; line-height: 2.1; margin: 0 0 1.8em; }
.story .sign { text-align: right; color: var(--muted); font-size: 15px; margin-top: 8px; }
.hero-title { border-top: 1px solid var(--border); font-size: clamp(20px, 4.4vw, 26px); }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; } }