:root{
  --ink:#14161C; --ink-2:#4A505B; --ink-3:#8A919C; --line:#E8EAEE; --mist:#F6F7FA;
  --night:#0A0D18; --cyan:#17B4D8; --pink:#FF5A7E;
  --grad:linear-gradient(115deg,#FF7A9A 0%,#C79BE0 48%,#5ED3FF 100%);
  --jp:"Zen Kaku Gothic New","Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  --en:"Outfit","Zen Kaku Gothic New",sans-serif;
  --gutter:clamp(20px,5vw,64px);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:88px}
body{font-family:var(--jp);color:var(--ink);background:#fff;line-height:1.9;font-feature-settings:"palt";-webkit-font-smoothing:antialiased}
h1,h2,h3,p,li{word-break:auto-phrase}
a{color:inherit}
img{display:block;max-width:100%}

.hdr{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.85);backdrop-filter:saturate(1.6) blur(16px);-webkit-backdrop-filter:saturate(1.6) blur(16px);border-bottom:1px solid var(--line)}
.hdr .in{max-width:1240px;margin:0 auto;padding:12px var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:18px;letter-spacing:.04em;text-decoration:none}
.logo img{width:32px;height:32px;border-radius:9px}
.back{font-size:13px;font-weight:700;text-decoration:none;color:var(--ink-2);display:inline-flex;align-items:center;gap:6px;padding:8px 14px;border-radius:99px;border:1px solid var(--line);transition:border-color .2s,color .2s}
.back:hover{color:var(--ink);border-color:var(--ink-3)}

.hero{position:relative;overflow:hidden;background:var(--night);color:#fff;padding:clamp(64px,9vw,110px) 0 clamp(56px,7vw,84px)}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(55% 70% at 85% 20%,rgba(255,90,126,.25),transparent 70%),radial-gradient(50% 70% at 5% 100%,rgba(23,180,216,.22),transparent 70%)}
.hero .in{position:relative;max-width:1120px;margin:0 auto;padding:0 var(--gutter)}
.eyebrow{font-family:var(--en);font-weight:600;font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:#9FE6F7;display:inline-flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:28px;height:1px;background:currentColor;opacity:.6}
.hero h1{font-size:clamp(34px,5.4vw,60px);font-weight:900;line-height:1.25;letter-spacing:-.01em;margin:16px 0 18px}
.hero p{color:rgba(255,255,255,.72);font-size:15px;max-width:40em}
.dates{margin-top:24px;display:flex;flex-wrap:wrap;gap:8px}
.dates span{font-size:12px;padding:6px 12px;border-radius:99px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.8)}

.layout{max-width:1120px;margin:0 auto;padding:clamp(48px,7vw,80px) var(--gutter) clamp(80px,10vw,120px);display:grid;grid-template-columns:240px 1fr;gap:clamp(32px,5vw,72px);align-items:start}
.toc{position:sticky;top:96px;font-size:13px}
.toc b{display:block;font-family:var(--en);font-size:11px;letter-spacing:.2em;color:var(--ink-3);margin-bottom:12px}
.toc ol{list-style:none;counter-reset:t;border-left:1px solid var(--line)}
.toc li{counter-increment:t}
.toc a{display:block;padding:6px 0 6px 16px;margin-left:-1px;border-left:2px solid transparent;color:var(--ink-2);text-decoration:none;line-height:1.6;transition:color .2s,border-color .2s}
.toc a::before{content:counter(t) ". ";font-family:var(--en);color:var(--ink-3)}
.toc a:hover,.toc a.on{color:var(--ink);border-left-color:var(--pink)}

.doc{max-width:720px;font-size:15px;color:var(--ink-2)}
.summary{background:var(--mist);border-radius:22px;padding:26px 28px;margin-bottom:48px;position:relative;overflow:hidden}
.summary::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--grad)}
.summary h2{font-size:16px;font-weight:900;color:var(--ink);margin-bottom:12px}
.summary ul{list-style:none;display:grid;gap:8px}
.summary li{padding-left:22px;position:relative;font-size:14px;line-height:1.8}
.summary li::before{content:"";position:absolute;left:2px;top:.62em;width:8px;height:8px;border-radius:50%;background:var(--grad)}
.doc section{padding-top:8px;margin-bottom:44px}
.doc h2{font-size:clamp(19px,2vw,22px);font-weight:900;color:var(--ink);line-height:1.5;margin-bottom:16px;display:flex;gap:12px;align-items:baseline}
.doc h2 .n{font-family:var(--en);font-weight:800;font-size:.85em;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;min-width:1.6em}
.doc h3{font-size:15.5px;font-weight:900;color:var(--ink);margin:22px 0 8px}
.doc p+p{margin-top:12px}
.doc ol,.doc ul{margin:12px 0 0 1.4em;display:grid;gap:6px}
.doc ol ol{margin-top:6px}
.doc strong{color:var(--ink)}
.tbl{width:100%;border-collapse:collapse;margin-top:14px;font-size:13.5px;line-height:1.75}
.tbl th,.tbl td{border-bottom:1px solid var(--line);padding:12px 10px;text-align:left;vertical-align:top}
.tbl th{color:var(--ink);font-weight:700;white-space:nowrap;background:var(--mist)}
.tbl thead th{background:#fff;font-size:12px;color:var(--ink-3)}
.note{margin-top:14px;font-size:13px;padding:14px 16px;border-radius:14px;border:1px solid var(--line);background:#fff}
.end{margin-top:56px;padding-top:24px;border-top:1px solid var(--line);font-size:13px;text-align:right;line-height:2}
.ph{background:#FFF4D6;color:#8A5A00;padding:0 4px;border-radius:4px;font-weight:700}

footer{background:var(--night);color:rgba(255,255,255,.6);padding:44px 0 36px;font-size:12px}
footer .in{max-width:1240px;margin:0 auto;padding:0 var(--gutter);display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center}
footer .logo{color:#fff}
footer nav{display:flex;gap:22px;flex-wrap:wrap}
footer nav a{text-decoration:none}
footer nav a:hover{color:#fff}

@media (max-width:900px){
  .layout{grid-template-columns:1fr}
  .toc{position:static;background:var(--mist);border-radius:18px;padding:20px 20px 14px}
  .toc ol{border-left:0;columns:2;column-gap:16px}
  .toc a{padding-left:0;border-left:0}
}
@media (max-width:520px){
  .toc ol{columns:1}
  .summary{padding:22px 20px}
  .tbl th{white-space:normal}
  .tbl,.tbl tbody,.tbl tr,.tbl th,.tbl td{display:block;width:100%}
  .tbl thead{display:none}
  .tbl th{border-bottom:0;padding-bottom:4px}
  .tbl td{padding-top:4px}
}