/* ============================================================
   HANRIA — 和 design system
   墨 sumi ink · 朱 shu vermillion · 生成り kinari washi ground
   Tate-gaki vertical labels · hanko seal · mincho display type
   ============================================================ */

:root{
  --washi:#f4f1ea;         /* 生成り kinari — unbleached paper */
  --washi-2:#eae5d9;
  --sumi:#1a1714;          /* 墨 sumi — ink */
  --sumi-2:#5c574e;
  --hairline:#d6cfc0;
  --card:#fbf9f4;
  --shu:#b7410e;           /* 朱 shu-iro — traditional vermillion */
  --shu-ink:#8f3209;
  --ai:#274a78;            /* 藍 ai — indigo, used sparingly */
  --mono:ui-monospace,SFMono-Regular,Menlo,monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Noto Sans JP","Yu Gothic",system-ui,sans-serif;
  --tone:rgba(26,23,20,.16);
  --mincho:"Hiragino Mincho ProN","Yu Mincho","Noto Serif JP","Songti SC",Georgia,serif;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --washi:#131110; --washi-2:#1a1715; --sumi:#ece7dc; --sumi-2:#9a938a;
  --hairline:#2f2a24; --card:#191614; --tone:rgba(236,231,220,.13); --shu:#d4633a; --shu-ink:#e07b52; --ai:#7d9dc4;}}
:root[data-theme="dark"]{--washi:#131110;--washi-2:#1a1715;--sumi:#ece7dc;--sumi-2:#9a938a;--hairline:#2f2a24;--card:#191614;--tone:rgba(236,231,220,.13);--shu:#d4633a;--shu-ink:#e07b52;--ai:#7d9dc4}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--washi);color:var(--sumi);
  font:16px/1.9 var(--sans);-webkit-font-smoothing:antialiased;
}

/* ============================================================
   Background: 青海波 seigaiha waves + manga screentone (網点)
   Translucent, layered, behind everything. No external assets.
   ============================================================ */
body::before{
  content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
  /* seigaiha wave field, fading toward the top so headings stay clean */
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='60' viewBox='0 0 120 60'><g fill='none' stroke='%23b7410e' stroke-width='1.1'><circle cx='0' cy='60' r='56'/><circle cx='0' cy='60' r='42'/><circle cx='0' cy='60' r='28'/><circle cx='0' cy='60' r='14'/><circle cx='60' cy='60' r='56'/><circle cx='60' cy='60' r='42'/><circle cx='60' cy='60' r='28'/><circle cx='60' cy='60' r='14'/><circle cx='120' cy='60' r='56'/><circle cx='120' cy='60' r='42'/><circle cx='120' cy='60' r='28'/><circle cx='120' cy='60' r='14'/><circle cx='30' cy='0' r='56'/><circle cx='30' cy='0' r='42'/><circle cx='30' cy='0' r='28'/><circle cx='30' cy='0' r='14'/><circle cx='90' cy='0' r='56'/><circle cx='90' cy='0' r='42'/><circle cx='90' cy='0' r='28'/><circle cx='90' cy='0' r='14'/></g></svg>");
  background-size:150px 75px;
  opacity:.16;
  -webkit-mask-image:linear-gradient(to bottom, transparent 0, rgba(0,0,0,.5) 22%, #000 60%);
  mask-image:linear-gradient(to bottom, transparent 0, rgba(0,0,0,.5) 22%, #000 60%);
}
body::after{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  /* 網点 manga screentone — halftone dots, denser at the corners */
  background-image:
    radial-gradient(circle at center, var(--tone) 0 1.5px, transparent 1.6px),
    radial-gradient(circle at center, var(--tone) 0 1.1px, transparent 1.2px);
  background-size:9px 9px, 14px 14px;
  background-position:0 0, 4px 6px;
  opacity:.5;
  -webkit-mask-image:radial-gradient(130% 90% at 50% 8%, transparent 42%, #000 100%);
  mask-image:radial-gradient(130% 90% at 50% 8%, transparent 42%, #000 100%);
}
/* 麻の葉 asanoha lattice behind the hero block only */
main.wrap::after{
  content:"";position:absolute;top:-40px;right:-40px;width:340px;height:420px;z-index:-1;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='80' height='139' viewBox='0 0 80 139'><g fill='none' stroke='%231a1714' stroke-width='1'><path d='M40 0 L80 23 L80 69 L40 92 L0 69 L0 23 Z'/><path d='M40 0 L40 92 M0 23 L80 69 M80 23 L0 69'/><path d='M40 46 L0 23 M40 46 L80 23 M40 46 L0 69 M40 46 L80 69'/><path d='M40 92 L80 115 L80 139 M40 92 L0 115 L0 139'/></g></svg>");
  background-size:110px 191px;
  opacity:.07;pointer-events:none;
  -webkit-mask-image:radial-gradient(70% 70% at 80% 20%, #000, transparent 72%);
  mask-image:radial-gradient(70% 70% at 80% 20%, #000, transparent 72%);
}

/* ---------- layout: asymmetric, with a vertical rule in the left margin ---------- */
.wrap{max-width:74ch;margin:0 auto;padding:0 30px}
@media(min-width:860px){
  .wrap{max-width:78ch;padding-left:78px}
  main.wrap::before{
    content:"";position:absolute;left:calc(50% - 39ch - 2px);top:0;bottom:0;
    width:1px;background:linear-gradient(to bottom,transparent,var(--hairline) 8%,var(--hairline) 92%,transparent);
  }
  main.wrap{position:relative}
}

/* ---------- 判子 hanko seal ---------- */
.seal{
  display:inline-flex;align-items:center;justify-content:center;
  width:52px;height:52px;flex:0 0 52px;
  background:var(--shu);color:#fdf8f2;border-radius:5px;
  font:700 10px/1.1 var(--mono);letter-spacing:.08em;
  writing-mode:vertical-rl;text-orientation:upright;
  padding:5px 2px;box-shadow:0 0 0 1px rgba(0,0,0,.06) inset;
  position:relative;
}
.seal::after{
  content:"";position:absolute;inset:3px;border:1px solid rgba(253,248,242,.42);border-radius:2px;
}

/* ---------- header ---------- */
header.site{padding:30px 0 0}
header.site .row{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.mark{font:600 20px/1 var(--mono);letter-spacing:.3em;padding-left:.3em}
.status{
  font:500 10.5px/1 var(--mono);letter-spacing:.2em;text-transform:uppercase;
  color:var(--shu);border:1px solid var(--shu);padding:6px 9px;border-radius:2px;
}
.langs{margin-left:auto;display:flex;gap:16px;font-size:13.5px}
.langs a{color:var(--sumi-2);text-decoration:none;padding-bottom:3px;border-bottom:2px solid transparent}
.langs a:hover{color:var(--sumi)}
.langs a[aria-current]{color:var(--shu);border-bottom-color:var(--shu)}
.rule{height:1px;background:var(--hairline);margin-top:26px}

/* ---------- banner: noren-like band ---------- */
.banner{
  background:var(--washi-2);border-block:1px solid var(--hairline);
  padding:15px 0;font-size:14.5px;
}
.banner strong{color:var(--shu-ink)}

/* ---------- 縦書き tate-gaki section labels in the left margin ---------- */
main{padding-top:20px;position:relative;z-index:1}
header.site,.banner,footer.site{position:relative;z-index:1}
section{position:relative;padding-bottom:8px}
.kicker{
  color:var(--shu);font:500 11.5px/1 var(--mono);letter-spacing:.26em;
  text-transform:uppercase;margin:5.2em 0 1.1em;
  display:flex;align-items:center;gap:12px;
}
/* narrow: a vermillion tick stands in for the vertical rule */
.kicker::before{
  content:"";flex:0 0 22px;height:1px;background:var(--shu);
}
@media(min-width:860px){
  .kicker{
    position:absolute;left:-78px;top:5.6em;margin:0;
    writing-mode:vertical-rl;text-orientation:mixed;
    letter-spacing:.34em;text-transform:none;font-size:11px;
    max-height:22em;white-space:nowrap;
  }
  .kicker::before{
    content:"";display:block;width:1px;height:26px;background:var(--shu);
    margin:0 auto 14px;
  }
  section,main>p.kicker{scroll-margin-top:40px}
}

/* ---------- display type: mincho ---------- */
h1{
  font-family:var(--mincho);font-weight:400;
  font-size:clamp(32px,5.8vw,52px);line-height:1.45;letter-spacing:.03em;
  margin:.55em 0 .5em;
}
h2{
  font-family:var(--mincho);font-weight:400;
  font-size:clamp(21px,3.2vw,30px);line-height:1.55;letter-spacing:.02em;margin:0 0 .65em;
}
h3{font-size:16px;font-weight:600;margin:1.9em 0 .28em;letter-spacing:.02em}
.lede{font-size:18px;color:var(--sumi-2);line-height:1.95}
p{margin:.9em 0}

/* ---------- 一二三四五 — kanji-numbered steps ---------- */
ol.steps{list-style:none;counter-reset:s;padding:0;margin:1.8em 0}
ol.steps li{
  counter-increment:s;display:grid;grid-template-columns:38px 1fr;gap:0 22px;
  padding:0 0 1.9em 0;align-items:start;
}
ol.steps li::before{
  content:counter(s,cjk-decimal);
  font-family:var(--mincho);font-size:26px;line-height:1.15;color:var(--shu);
  text-align:center;border-right:1px solid var(--hairline);padding-right:22px;
  grid-row:span 2;
}
ol.steps h3{margin:0 0 .22em;grid-column:2}
ol.steps p{margin:0;color:var(--sumi-2);font-size:15px;grid-column:2}

/* ---------- cards: shoji grid ---------- */
.grid{display:grid;gap:1px;background:var(--hairline);border:1px solid var(--hairline);margin:1.9em 0}
@media(min-width:620px){.grid{grid-template-columns:1fr 1fr}}
.card{background:var(--card);padding:22px 24px}
.card h3{margin:0 0 .38em}
.card p{margin:0;font-size:15px;color:var(--sumi-2)}

/* ---------- bounds ---------- */
.bounds{list-style:none;padding:0;margin:1.6em 0;border-top:1px solid var(--hairline)}
.bounds li{
  border-bottom:1px solid var(--hairline);padding:15px 0 15px 26px;
  font-size:15px;color:var(--sumi-2);position:relative;
}
.bounds li::before{content:"・";position:absolute;left:2px;color:var(--shu);font-size:15px}
.bounds strong{color:var(--sumi)}

/* ---------- details ---------- */
details{border-bottom:1px solid var(--hairline);padding:17px 0}
details summary{cursor:pointer;font-weight:600;font-size:16px;list-style:none}
details summary::-webkit-details-marker{display:none}
details summary::before{content:"＋";color:var(--shu);margin-right:12px;font-size:13px}
details[open] summary::before{content:"−"}
details p{color:var(--sumi-2);font-size:15px;margin:.75em 0 0 26px}

/* ---------- footer ---------- */
footer.site{
  border-top:1px solid var(--hairline);margin-top:5.5em;
  padding:34px 0 64px;font-size:13.5px;color:var(--sumi-2);
}
footer.site .row{display:flex;align-items:center;gap:14px;margin-bottom:1.1em}
footer.site .mark{font-size:15px;color:var(--sumi)}

/* ---------- links ---------- */
main a,footer.site a,.bounds a{
  color:var(--shu);text-decoration:none;
  border-bottom:1px solid color-mix(in srgb,var(--shu) 28%,transparent);
}
main a:hover,footer.site a:hover,.bounds a:hover{border-bottom-color:var(--shu)}

/* ---------- code ---------- */
pre.code{
  background:var(--card);border:1px solid var(--hairline);border-left:2px solid var(--shu);
  padding:17px 19px;overflow-x:auto;font:13.5px/1.75 var(--mono);margin:1.5em 0;
}
code{font:.92em/1 var(--mono);background:var(--card);border:1px solid var(--hairline);padding:2px 5px;border-radius:3px}
pre.code code{background:none;border:0;padding:0}

/* ---------- CJK pages ---------- */
:lang(ja),:lang(zh),:lang(ko){line-height:2.05}
:lang(ja) h1,:lang(zh) h1,:lang(ko) h1{letter-spacing:.06em;line-height:1.62}
:lang(ja) h2,:lang(zh) h2,:lang(ko) h2{letter-spacing:.05em;line-height:1.7}
:lang(ja) .kicker,:lang(zh) .kicker,:lang(ko) .kicker{text-transform:none;letter-spacing:.2em}
.open-q{color:var(--sumi-2);font-weight:400}

/* ---------- three-column maturity map ---------- */
@media(min-width:900px){.grid.three{grid-template-columns:1fr 1fr 1fr}}
.grid.three .card p{font-size:14.5px}
.meta{font-size:15px;color:var(--sumi-2);margin:.9em 0 0}