:root{
  --brand:#1677ff;--brand-d:#0958d9;--ink:#1f2733;--muted:#5b6675;--bg:#fff;
  --soft:#f5f8ff;--line:#e7eef7;--ok:#16a34a;--warn:#b7791f;--code:#0b1220;
  --sidebar:280px;--toc:220px;--radius:12px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:'Noto Sans JP','Hiragino Sans','Meiryo',system-ui,sans-serif;color:var(--ink);background:var(--bg);line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}
/* topbar */
.topbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:16px;height:60px;padding:0 20px;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:16px;color:var(--ink)}
.brand .mark{width:30px;height:30px;border-radius:8px;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:15px}
.brand .bsub{font-weight:600;color:var(--muted);font-size:13px}
.search{position:relative;flex:1;max-width:460px}
.search input{width:100%;height:38px;border:1px solid var(--line);border-radius:9px;padding:0 14px;font-size:14px;background:var(--soft)}
.search input:focus{outline:none;border-color:var(--brand);background:#fff}
.results{position:absolute;top:44px;left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 30px rgba(0,0,0,.1);overflow:hidden;display:none;max-height:60vh;overflow-y:auto}
.results.show{display:block}
.results a{display:block;padding:10px 14px;border-bottom:1px solid var(--line);color:var(--ink)}
.results a:hover{background:var(--soft);text-decoration:none}
.results .rc{font-size:12px;color:var(--muted)}
.results .empty{padding:12px 14px;color:var(--muted);font-size:14px}
.top-links a{margin-left:16px;color:var(--muted);font-weight:600;font-size:14px}
.top-links .cta{color:var(--brand)}
.menu-btn{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:5px 10px;font-size:18px;cursor:pointer}
/* layout */
.layout{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr) var(--toc);max-width:1480px;margin:0 auto}
.sidebar{position:sticky;top:60px;align-self:start;height:calc(100vh - 60px);overflow-y:auto;border-right:1px solid var(--line);padding:22px 16px 60px}
.side-nav .home-link{display:block;font-weight:700;padding:8px 10px;border-radius:8px;color:var(--ink)}
.side-nav .home-link:hover,.side-nav .home-link.active{background:var(--soft);color:var(--brand);text-decoration:none}
.side-nav .cat{font-size:12px;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin:18px 0 6px;padding:0 10px}
.side-nav ul{list-style:none;margin:0;padding:0}
.side-nav li a{display:block;padding:6px 10px;border-radius:8px;color:var(--ink);font-size:14px;font-weight:500}
.side-nav li a:hover{background:var(--soft);text-decoration:none}
.side-nav li a.active{background:#e9f2ff;color:var(--brand);font-weight:700}
/* content */
.content{min-width:0;padding:30px 44px 90px;max-width:860px}
.crumbs{font-size:13px;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}.crumbs span{margin:0 6px;color:#c2ccd8}
.content h1{font-size:31px;margin:0 0 10px;letter-spacing:-.01em}
.content .lead{font-size:17px;color:var(--muted);margin:0 0 26px}
.content h2{font-size:23px;margin:38px 0 12px;padding-top:10px;border-top:1px solid var(--line)}
.content h3{font-size:17px;margin:24px 0 6px}
.content h2.anchored .ah,.content h3.anchored .ah{opacity:0;margin-left:8px;color:var(--muted);font-weight:400;text-decoration:none}
.content h2.anchored:hover .ah,.content h3.anchored:hover .ah{opacity:.6}
.content p,.content li{font-size:15.5px}
.content ul,.content ol{padding-left:22px}.content li{margin:5px 0}
.steps{counter-reset:s;list-style:none;padding-left:0;margin:14px 0}
.steps>li{position:relative;padding:8px 0 8px 44px;border-bottom:1px dashed var(--line)}
.steps>li:last-child{border-bottom:none}
.steps>li::before{counter-increment:s;content:counter(s);position:absolute;left:0;top:7px;width:27px;height:27px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:13px;font-weight:700}
code{background:var(--soft);border:1px solid var(--line);border-radius:5px;padding:1px 6px;font-size:13px;font-family:ui-monospace,Menlo,monospace}
pre{background:var(--code);color:#e6edf6;border-radius:10px;padding:14px 16px;overflow:auto;font-size:13px}
pre code{background:none;border:none;color:inherit;padding:0}
.note,.tip,.warn{border-radius:10px;padding:12px 16px;margin:16px 0;font-size:14.5px;border:1px solid}
.note{background:var(--soft);border-color:var(--line)}
.tip{background:#f0fdf4;border-color:#bbf7d0}.tip b{color:var(--ok)}
.warn{background:#fff7e6;border-color:#ffe7ba}.warn b{color:var(--warn)}
.acct{background:#f7f4ff;border:1px solid #e4dcff;border-radius:10px;padding:12px 16px;margin:16px 0;font-size:14.5px}
.acct b{color:#6d28d9}
table{border-collapse:collapse;width:100%;margin:16px 0;font-size:14px}
th,td{border:1px solid var(--line);padding:8px 12px;text-align:left;vertical-align:top}
th{background:var(--soft);font-weight:700}
.pill{display:inline-block;font-size:11px;font-weight:700;border-radius:999px;padding:2px 9px;margin-left:6px;vertical-align:middle}
.pill.free{background:#eef2ff;color:#4338ca}.pill.paid{background:#fff7e6;color:var(--warn)}
.related{margin:30px 0 0;background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.related .rh{font-weight:700;font-size:14px;margin-bottom:6px}
.related a{display:inline-block;margin:3px 10px 3px 0;font-size:14px}
.prevnext{display:flex;justify-content:space-between;gap:14px;margin-top:40px}
.pn{flex:1;border:1px solid var(--line);border-radius:12px;padding:12px 16px;color:var(--ink)}
.pn:hover{border-color:var(--brand);text-decoration:none}
.pn span{display:block;font-size:12px;color:var(--muted)}.pn b{font-size:15px}
.pn.next{text-align:right}
/* on this page */
.toc{position:sticky;top:60px;align-self:start;height:calc(100vh - 60px);overflow-y:auto;padding:30px 18px;font-size:13px}
.toc-h{font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.04em;font-size:11px;margin-bottom:8px}
.toc a{display:block;color:var(--muted);padding:4px 0 4px 10px;border-left:2px solid var(--line)}
.toc a:hover{color:var(--brand);text-decoration:none}
.toc a.lvl3{padding-left:22px}
.toc a.active{color:var(--brand);border-left-color:var(--brand);font-weight:600}
/* home */
.hero{padding:14px 0 8px}
.hero h1{font-size:34px;margin:0 0 8px}
.hero p{font-size:17px;color:var(--muted);max-width:640px}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:28px 0}
.card{display:block;border:1px solid var(--line);border-radius:14px;padding:20px;color:var(--ink)}
.card:hover{border-color:var(--brand);text-decoration:none;box-shadow:0 8px 22px rgba(22,119,255,.08)}
.card .ic{font-size:22px}.card h3{margin:8px 0 4px;font-size:16px}.card p{margin:0;color:var(--muted);font-size:13.5px}
.card .links{margin-top:8px;font-size:13px}
.docfoot{border-top:1px solid var(--line);padding:24px 20px;color:var(--muted);font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;max-width:1480px;margin:0 auto}
.scrim{display:none}
@media(max-width:1180px){.layout{grid-template-columns:var(--sidebar) minmax(0,1fr)}.toc{display:none}}
@media(max-width:860px){
  .layout{grid-template-columns:1fr}.content{padding:24px 20px 70px}
  .cards{grid-template-columns:1fr}.top-links{display:none}.menu-btn{display:block}
  .sidebar{position:fixed;top:60px;left:0;width:300px;background:#fff;z-index:35;transform:translateX(-100%);transition:transform .2s;box-shadow:0 10px 40px rgba(0,0,0,.12)}
  .sidebar.open{transform:translateX(0)}
  .scrim.show{display:block;position:fixed;inset:60px 0 0 0;background:rgba(0,0,0,.3);z-index:34}
}