@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');
:root{
  --bg:#ffffff; --panel:#f1f5f9; --panel2:#e8edf3; --ink:#0f172a; --muted:#475569;
  --line:#e2e8f0; --accent:#1d4ed8; --accent-soft:#dbeafe; --code-bg:#0f172a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:'Inter',system-ui,sans-serif;line-height:1.7;font-size:16.5px}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
/* layout: fixed left sidebar + content + on-this-page rail */
.layout{display:flex;align-items:stretch}
.sidebar{position:fixed;top:0;left:0;bottom:0;width:280px;background:var(--panel);border-right:1px solid var(--line);padding:22px 20px;overflow-y:auto;z-index:60}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);margin-bottom:26px}
.brand svg{width:34px;height:34px}
.brand-name{font-weight:800;font-size:20px;letter-spacing:-.3px}
.brand-name em{font-style:normal;color:var(--accent)}
.side-nav{display:flex;flex-direction:column;gap:2px}
.side-nav .side-label{font-size:11.5px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;color:var(--muted);margin:16px 0 8px}
.side-nav a{text-decoration:none;color:var(--ink);font-size:14.5px;font-weight:500;padding:9px 12px;border-radius:8px;border-left:3px solid transparent}
.side-nav a:hover{background:var(--panel2)}
.side-nav a.active{background:var(--accent-soft);border-left-color:var(--accent);color:var(--accent);font-weight:600}
.side-nav a.tool-link{background:var(--ink);color:#fff;font-weight:700;margin-top:14px;text-align:center;border-left:none}
.side-nav a.tool-link:hover{background:var(--accent)}
.side-foot{margin-top:28px;padding-top:16px;border-top:1px solid var(--line);font-size:12.5px;color:var(--muted)}
.content{margin-left:280px;flex:1;min-width:0}
.doc{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:44px;max-width:1020px;margin:0 auto;padding:44px 40px 20px}
.doc-main{min-width:0}
.breadcrumb{font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--muted);margin:0 0 14px}
.breadcrumb a{color:var(--accent);text-decoration:none}
.breadcrumb a:hover{text-decoration:underline}
h1{font-size:clamp(30px,3.6vw,42px);line-height:1.2;letter-spacing:-.8px;margin:0 0 14px}
.lede{font-size:18px;color:var(--muted);margin:0 0 26px;max-width:62ch}
.lede strong{color:var(--ink)}
h2{font-size:24px;letter-spacing:-.4px;margin:40px 0 12px;padding-top:8px;border-top:1px solid var(--line);scroll-margin-top:20px}
h2:first-of-type{border-top:none}
h3{font-size:18.5px;margin:28px 0 8px;scroll-margin-top:20px}
p{margin:0 0 15px;color:var(--muted)}
p strong,li strong{color:var(--ink)}
ul,ol{color:var(--muted);margin:0 0 16px;padding-left:24px}
li{margin-bottom:8px}
code{font-family:'JetBrains Mono',monospace;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:2px 7px;font-size:.88em;color:var(--ink)}
/* tool panel */
.tool-panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:26px 0}
.tool-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:15px 20px;border-bottom:1px solid var(--line);background:#fff}
.tool-head .t{font-weight:700;font-size:16px;font-family:'JetBrains Mono',monospace}
.chip{margin-left:auto;display:inline-flex;align-items:center;gap:7px;background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;border-radius:999px;padding:5px 13px;font-weight:600;font-size:12.5px}
.chip svg{width:15px;height:15px}
.tool-body{padding:22px 20px}
.opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(215px,1fr));gap:14px;margin-bottom:18px}
.opt{background:#fff;border:1px solid var(--line);border-radius:10px;padding:14px}
.opt-label{display:block;font-weight:700;font-size:12px;text-transform:uppercase;letter-spacing:1.2px;color:var(--muted);margin-bottom:10px}
.opt-hint{font-size:12.5px;color:var(--muted);margin:8px 0 0}
.seg{display:flex;flex-wrap:wrap;gap:7px}
.seg button{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:7px;padding:7px 11px;font-weight:600;font-size:13px;cursor:pointer;font-family:'JetBrains Mono',monospace}
.seg button[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.num-row{display:flex;align-items:center;gap:10px}
.num-row input[type=range]{flex:1;accent-color:var(--accent)}
.num-row input[type=number]{width:64px;border:1px solid var(--line);border-radius:7px;padding:6px 8px;font-size:14px;font-family:'JetBrains Mono',monospace}
.actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:9px;padding:10px 18px;font-weight:600;font-size:14.5px;cursor:pointer;font-family:inherit;display:inline-flex;align-items:center;gap:8px;text-decoration:none}
.btn:hover{border-color:var(--ink)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:#1e40af}
.btn svg{width:16px;height:16px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.copy-note{font-size:13px;font-weight:600;color:#047857}
.output{margin-top:16px;border:1px solid var(--line);border-radius:10px;background:#fff;min-height:110px;padding:16px}
.output ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.output li{display:flex;align-items:center;gap:11px;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:9px 13px;cursor:pointer;font-weight:500;font-size:14.5px}
.output li:hover{border-color:var(--accent)}
.output li .idx{font-family:'JetBrains Mono',monospace;color:var(--accent);font-size:12.5px;min-width:28px}
.output li .mini-copy{margin-left:auto;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:1px;color:var(--muted);border:1px dashed var(--muted);border-radius:6px;padding:2px 8px;font-family:'JetBrains Mono',monospace}
.output .placeholder{color:var(--muted);text-align:center;margin:26px 0;font-size:14.5px}
.output-meta{margin-top:9px;font-size:12.5px;color:var(--muted);font-family:'JetBrains Mono',monospace}
/* callouts */
.callout{border:1px solid var(--line);border-left:4px solid var(--accent);background:var(--accent-soft);border-radius:0 10px 10px 0;padding:14px 18px;margin:20px 0;font-size:14.5px}
.callout.warning{border-left-color:#d97706;background:#fef3c7}
.callout h4{margin:0 0 6px;font-size:15px}
.callout p{margin:0}
.cards2{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:14px;margin:18px 0}
.mini-card{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px}
.mini-card .k{font-family:'JetBrains Mono',monospace;font-size:12px;font-weight:700;color:var(--accent);letter-spacing:1px;text-transform:uppercase}
.mini-card h3{margin:6px 0 8px;font-size:17px;border:none;padding:0}
.mini-card p{font-size:14px;margin:0}
a.mini-card{color:inherit;text-decoration:none;display:block}
a.mini-card:hover{border-color:var(--accent)}
.mini-card .go{display:inline-block;margin-top:12px;font-weight:600;color:var(--accent);font-size:14px}
/* faq */
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:10px;margin-bottom:10px;padding:0 18px}
.faq summary{cursor:pointer;font-weight:600;font-size:16px;padding:15px 0;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq .plus{color:var(--accent);font-size:20px;flex:none;font-family:'JetBrains Mono',monospace}
.faq .answer{padding:0 0 16px;font-size:15px}
.faq .answer p{margin:0 0 8px}
/* on this page rail */
.otp{position:sticky;top:30px;align-self:start;font-size:13.5px}
.otp .otp-title{font-size:11.5px;font-weight:700;letter-spacing:1.6px;text-transform:uppercase;color:var(--muted);margin-bottom:10px}
.otp a{display:block;color:var(--muted);text-decoration:none;padding:5px 0 5px 12px;border-left:2px solid var(--line);font-size:13px}
.otp a:hover{color:var(--accent);border-left-color:var(--accent)}
/* example list */
.ex-list{margin:16px 0}
.ex-list .ex{border:1px solid var(--line);border-radius:8px;padding:12px 16px;margin-bottom:10px;background:#fff;display:flex;gap:14px;align-items:baseline}
.ex-list .ex .tag{font-family:'JetBrains Mono',monospace;font-size:11.5px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:6px;padding:3px 9px;white-space:nowrap}
.ex-list .ex .t{font-weight:600;font-size:15px}
/* footer */
footer{margin-left:280px;border-top:1px solid var(--line);background:var(--panel);margin-top:50px}
footer .wrap{padding-top:30px;padding-bottom:22px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:24px}
.foot-col h4{margin:0 0 10px;font-size:14px;text-transform:uppercase;letter-spacing:1px}
.foot-col a{display:block;text-decoration:none;color:var(--muted);font-size:14px;margin-bottom:7px}
.foot-col a:hover{color:var(--accent)}
.foot-brand p{color:var(--muted);font-size:14px;max-width:36ch}
.foot-base{grid-column:1/-1;border-top:1px solid var(--line);padding-top:14px;display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:12.5px;color:var(--muted);font-family:'JetBrains Mono',monospace}
.menu-toggle{display:none}
/* mobile */
@media(max-width:1100px){.doc{grid-template-columns:1fr}.otp{display:none}}
@media(max-width:820px){
  .sidebar{transform:translateX(-100%);transition:transform .25s ease;width:280px}
  body.nav-open .sidebar{transform:none}
  .content,footer{margin-left:0}
  .doc{padding:24px 20px}
  .menu-toggle{display:inline-flex;position:fixed;top:14px;left:14px;z-index:70;background:var(--ink);color:#fff;border:none;border-radius:8px;padding:10px 14px;font-weight:700;font-size:14px;cursor:pointer}
  footer .wrap{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}