:root{
  --bg:#f7f8fb;
  --paper:#fffdf8;
  --ink:#372733;
  --muted:#72636d;
  --line:#d9d0d6;
  --violet:#9a80ff;
  --violet-dark:#6f55df;
  --lavender:#eadfff;
  --mint:#4edfa6;
  --mint-soft:#dff9ee;
  --sun:#ffd45f;
  --sky:#79dfff;
  --peach:#ff9f82;
  --danger:#b84255;
  --radius:8px;
  --shadow:0 12px 30px rgba(55,39,51,.08);
  --mono:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono",monospace;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}

*{box-sizing:border-box;letter-spacing:0}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.68;overflow-x:hidden}
[hidden]{display:none!important}
body.modal-open{overflow:hidden}
a{color:var(--violet-dark);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:#4933aa}
button,input,select{font:inherit}
img{max-width:100%;height:auto}
code,pre{font-family:var(--mono)}
.wrap{width:min(1120px,calc(100% - 40px));margin-inline:auto}
.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.skip-link{position:fixed;left:12px;top:12px;z-index:200;transform:translateY(-160%);background:var(--ink);color:#fff;padding:10px 14px;border-radius:6px}
.skip-link:focus{transform:none;color:#fff}

.site-header{position:sticky;top:0;z-index:50;background:rgba(247,248,251,.96);border-bottom:1px solid rgba(55,39,51,.1);backdrop-filter:blur(14px)}
.topbar{min-height:72px;display:flex;align-items:center;gap:22px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;flex:0 0 auto}
.brand img{width:46px;height:46px;object-fit:contain}
.brand span{display:flex;flex-direction:column;line-height:1.1}
.brand strong{font-size:16px;font-weight:900}
.brand small{font-family:var(--mono);font-size:10px;color:var(--muted);margin-top:4px}
.primary-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.primary-nav a{padding:9px 11px;color:var(--ink);font-size:14px;font-weight:750;text-decoration:none;border-radius:6px}
.primary-nav a:hover{background:#fff}
.icon-button{width:40px;height:40px;padding:0;display:inline-grid;place-items:center;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink);cursor:pointer;text-decoration:none;flex:0 0 40px}
.icon-button:hover{background:var(--lavender);color:var(--ink);border-color:var(--violet)}

.hero-section,.core-hero{padding:64px 0 34px;text-align:center}
.section-kicker,.tool-label{display:inline-flex;align-items:center;font-family:var(--mono);font-size:11px;font-weight:900;color:var(--violet-dark);text-transform:uppercase}
.hero-section h1,.core-hero h1{max-width:900px;margin:14px auto 18px;font-size:54px;line-height:1.06;font-weight:950}
.hero-lede,.core-hero>p{max-width:820px;margin:0 auto;color:var(--muted);font-size:19px;line-height:1.65}
.hero-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:11px 16px;border:1px solid var(--ink);border-radius:7px;font-size:14px;font-weight:850;text-decoration:none;cursor:pointer;text-align:center}
.btn-primary{background:var(--ink);color:#fff;box-shadow:4px 4px 0 var(--mint)}
.btn-primary:hover{background:#22171f;color:#fff;transform:translateY(-1px)}
.btn-secondary{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-secondary:hover{background:var(--lavender);color:var(--ink);border-color:var(--violet)}
.fact-strip{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:28px}
.fact-strip span,.tool-state{display:inline-flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid var(--line);border-radius:999px;background:#fff;font-family:var(--mono);font-size:11px;font-weight:750}
.fact-strip span:nth-child(1){background:var(--mint-soft)}
.fact-strip span:nth-child(2){background:var(--lavender)}
.fact-strip span:nth-child(3){background:#e8f7ff}
.fact-strip span:nth-child(4){background:#fff5cd}

.tool-section{padding:18px 0 54px;scroll-margin-top:82px}
.tool-card{background:#fff;border:1px solid var(--line);border-top:4px solid var(--ink);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}
.tool-card-header{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.tool-card-header h2{font-size:27px;line-height:1.2;margin:5px 0 6px}
.tool-card-header p{margin:0;color:var(--muted);max-width:720px}
.version-tool-grid,.bit-tool-grid{display:grid;grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:24px;padding-top:24px}
.control-panel{padding:18px;background:var(--paper);border:1px solid var(--line);border-radius:7px}
.control-panel label{display:block;font-size:13px;font-weight:850;margin-bottom:7px}
select,input[type="search"]{width:100%;min-height:48px;border:1px solid #bdb1b8;border-radius:6px;background:#fff;color:var(--ink);padding:10px 12px;outline:none}
select:focus,input[type="search"]:focus{border-color:var(--violet-dark);box-shadow:0 0 0 3px rgba(154,128,255,.2)}
.field-help{font-size:13px;color:var(--muted);margin:12px 0 0}
.inline-alert{display:flex;gap:9px;align-items:flex-start;margin-top:16px;padding:11px;border-left:3px solid var(--sun);background:#fff9df;font-size:13px}
.result-panel{padding:21px;background:#21161f;color:#fff;border-radius:7px;min-height:315px;display:flex;flex-direction:column}
.result-top{display:flex;justify-content:space-between;align-items:center;gap:12px;font-family:var(--mono);font-size:11px;color:#d7cbd4}
.status{display:inline-flex;align-items:center;padding:4px 8px;border-radius:999px;font-family:var(--mono);font-size:11px;font-weight:900}
.status-good{background:var(--mint-soft);color:#135b40}
.status-warn{background:#fff1b8;color:#704e00}
.result-version{font-size:29px;line-height:1.2;margin:21px 0 16px;color:#fff}
.result-panel dl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:0 0 20px}
.result-panel dl div{padding:9px 10px;border:1px solid rgba(255,255,255,.14);border-radius:6px}
.result-panel dt{font-family:var(--mono);font-size:10px;color:#bfb0ba}
.result-panel dd{margin:2px 0 0;font-size:13px;font-weight:800;overflow-wrap:anywhere}
.result-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:auto}
.result-panel .btn-primary{background:var(--mint);color:#14261f;border-color:var(--mint);box-shadow:none}
.result-panel .btn-secondary{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}
.version-detail-link{display:inline-block;margin-top:14px;color:var(--sky);font-size:13px}

.section-intro,.content-heading{margin-bottom:22px}
.section-intro h2,.content-heading h2,.split-band h2{font-size:36px;line-height:1.16;margin:8px 0 10px}
.section-intro p,.content-heading p{max-width:780px;color:var(--muted);margin:0}
.structure-controls{display:grid;gap:8px}
.structure-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 14px;border:1px solid var(--line);border-radius:7px;background:var(--paper)}
.structure-row>div:first-child{display:flex;flex-direction:column}
.structure-row strong{font-size:14px}
.structure-row span{font-family:var(--mono);font-size:10px;color:var(--muted)}
.stepper{display:grid;grid-template-columns:34px 36px 34px;align-items:center;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:#fff;flex:0 0 auto}
.stepper button{height:34px;border:0;background:#fff;color:var(--ink);cursor:pointer}
.stepper button:hover{background:var(--lavender)}
.stepper output{text-align:center;font-family:var(--mono);font-weight:900}
.bit-results{display:grid;gap:13px;align-content:start}
.meter-block,.recommendation-panel{padding:16px;border:1px solid var(--line);border-radius:7px;background:#fff}
.meter-label{display:flex;justify-content:space-between;gap:14px;font-size:14px}
.meter-label strong{font-family:var(--mono)}
.meter{height:12px;margin:12px 0 8px;background:#e7e2e6;border-radius:999px;overflow:hidden}
.meter span{display:block;width:0;height:100%;background:var(--mint);transition:width .25s ease}
.meter-violet span{background:var(--violet)}
.meter-block p,.recommendation-panel p{margin:0;color:var(--muted);font-size:13px}
.recommendation-panel{border-left:4px solid var(--sun);background:#fffbeb}
.recommendation-panel strong{display:block;margin:5px 0 4px}
.center-link{text-align:center;margin-top:17px;font-weight:800}

.content-band,.split-band,.faq-section,.related-section,.article-body{padding:54px 0}
.intro-band{padding-top:34px}
.prose-columns{columns:2;column-gap:48px}
.prose-columns p{margin:0 0 18px;break-inside:avoid}
.process-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.process-grid article{padding:20px;border-right:1px solid var(--line)}
.process-grid article:last-child{border-right:0}
.process-grid b{font-family:var(--mono);color:var(--violet-dark)}
.process-grid h3{font-size:17px;margin:8px 0 7px}
.process-grid p{font-size:14px;color:var(--muted);margin:0}
.split-band{display:grid;grid-template-columns:1.05fr .95fr;gap:42px;align-items:center}
.text-link{font-weight:850}
.terminal-panel{background:#21161f;color:#fff;border-radius:8px;box-shadow:7px 7px 0 var(--violet);overflow:hidden}
.terminal-top{display:flex;align-items:center;gap:7px;padding:10px 13px;border-bottom:1px solid rgba(255,255,255,.12)}
.terminal-top span{width:9px;height:9px;border-radius:50%;background:var(--peach)}
.terminal-top span:nth-child(2){background:var(--sun)}
.terminal-top span:nth-child(3){background:var(--mint)}
.terminal-top b{font-family:var(--mono);font-size:10px;color:#cbbfc7;margin-left:5px}
.terminal-panel pre{margin:0;padding:23px;overflow:auto;font-size:13px;line-height:1.65;color:#d9fff0}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{text-align:left;padding:13px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#f1edf8;font-family:var(--mono);font-size:11px;color:#5f4a59}
td{font-size:14px}
tbody tr:last-child td{border-bottom:0}
.source-band{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.source-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}
.source-links a{display:inline-flex;align-items:center;gap:8px;padding:9px 12px;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--ink);text-decoration:none;font-size:13px;font-weight:800}

.faq-list{display:grid;gap:9px}
.faq-list details{background:#fff;border:1px solid var(--line);border-radius:7px;padding:0 17px}
.faq-list summary{list-style:none;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:15px 0;font-weight:850;cursor:pointer}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:"+";font-family:var(--mono);font-size:18px;color:var(--violet-dark)}
.faq-list details[open] summary::after{content:"−"}
.faq-list p{margin:0;padding:0 0 16px;color:var(--muted);max-width:900px}
.related-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}
.related-grid a{min-height:150px;display:flex;flex-direction:column;align-items:flex-start;padding:17px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--ink);text-decoration:none}
.related-grid a:hover{border-color:var(--violet);box-shadow:var(--shadow)}
.related-grid i{font-size:21px;color:var(--violet-dark);margin-bottom:auto}
.related-grid strong{margin-top:18px}
.related-grid span{font-size:13px;color:var(--muted);margin-top:4px}

.breadcrumbs{display:flex;justify-content:center;align-items:center;gap:8px;font-size:12px;color:var(--muted);margin-bottom:20px}
.breadcrumbs a{color:var(--muted)}
.core-hero{padding-bottom:26px}
.core-hero h1{font-size:47px}
.hero-note{max-width:820px;margin:22px auto 0;display:flex;align-items:flex-start;gap:10px;text-align:left;padding:12px 14px;background:#fff9df;border-left:3px solid var(--sun);font-size:13px}
.core-tool{padding-top:8px}
.article-body{max-width:900px}
.article-section{padding:42px 0;border-top:1px solid var(--line);scroll-margin-top:90px}
.article-section:first-child{border-top:0}
.article-section h2{font-size:34px;line-height:1.2;margin:8px 0 14px}
.article-section p{margin:0 0 17px}
.section-lead{font-size:19px;color:var(--muted)}
.check-list{padding:0;list-style:none;display:grid;gap:9px;margin:18px 0}
.check-list li{position:relative;padding:11px 13px 11px 39px;background:#fff;border:1px solid var(--line);border-radius:6px}
.check-list li::before{content:"✓";position:absolute;left:14px;color:#13704d;font-weight:900}
.guide-figure{margin:26px 0 0}
.guide-figure img{display:block;width:100%;border:1px solid var(--line);border-radius:7px;background:#fff}
.guide-figure figcaption{font-size:12px;color:var(--muted);margin-top:8px}

.search-field{position:relative;display:block;margin:20px 0}
.search-field i{position:absolute;left:14px;top:16px;color:var(--muted)}
.search-field input{padding-left:40px}
.command-list{display:grid;gap:8px}
.command-row{display:flex;justify-content:space-between;align-items:center;gap:18px;padding:14px;border:1px solid var(--line);border-radius:7px;background:var(--paper)}
.command-row code{font-weight:900;color:var(--violet-dark);overflow-wrap:anywhere}
.command-row p{margin:4px 0 0;font-size:13px;color:var(--muted)}
.empty-state{text-align:center;padding:24px;color:var(--muted)}
.segmented-control{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin:22px 0}
.segmented-control button{min-height:44px;border:1px solid var(--line);border-radius:6px;background:#fff;font-weight:850;cursor:pointer}
.segmented-control button[aria-pressed="true"]{background:var(--ink);color:#fff;border-color:var(--ink)}
.loader-result{display:flex;gap:15px;padding:19px;border-radius:7px;border:1px solid var(--line)}
.loader-result>i{font-size:24px;margin-top:3px}
.loader-result strong{font-size:18px}
.loader-result p{margin:5px 0 7px;color:var(--muted)}
.loader-supported{background:var(--mint-soft);border-color:#9adfc5}
.loader-supported>i{color:#13704d}
.loader-unsupported{background:#fff0f2;border-color:#efb7c0}
.loader-unsupported>i{color:var(--danger)}
.check-progress{font-family:var(--mono);font-size:25px;color:var(--violet-dark)}
.checklist-items{display:grid;gap:8px;margin-top:20px}
.checklist-items label{display:flex;align-items:flex-start;gap:12px;padding:13px;border:1px solid var(--line);border-radius:7px;background:var(--paper);cursor:pointer}
.checklist-items input{width:20px;height:20px;accent-color:var(--violet-dark);margin-top:3px}
.checklist-items span{display:flex;flex-direction:column}
.checklist-items b{font-size:14px}
.checklist-items span{font-size:13px;color:var(--muted)}
.check-complete{display:flex;align-items:center;gap:9px;margin-top:13px;padding:12px;background:var(--mint-soft);border-radius:6px;color:#135b40;font-weight:800}

.legal-panel{max-width:900px;margin:0 auto 70px;padding:34px;background:#fff;border:1px solid var(--line);border-radius:8px}
.legal-panel section+section{border-top:1px solid var(--line);margin-top:28px;padding-top:22px}
.legal-panel h2{font-size:25px}
.legal-meta{display:inline-block;padding:5px 9px;background:var(--lavender);border-radius:999px;font-family:var(--mono);font-size:11px}
.error-hero{min-height:60vh;display:flex;flex-direction:column;align-items:center;justify-content:center}

.download-gate{position:fixed;inset:0;z-index:150;display:grid;place-items:center;padding:20px;background:rgba(31,21,29,.74)}
.download-gate[hidden]{display:none}
.download-gate-dialog{position:relative;width:min(520px,100%);padding:28px;background:#fff;border-radius:8px;box-shadow:0 24px 80px rgba(0,0,0,.32)}
.download-gate-dialog h2{font-size:25px;margin:7px 0 9px}
.download-gate-close{position:absolute;right:12px;top:12px}
.countdown-track{height:10px;background:#e6e0e4;border-radius:999px;overflow:hidden;margin:18px 0 9px}
.countdown-track span{display:block;width:100%;height:100%;background:var(--violet);transition:width .2s linear}
.download-status{font-size:13px;color:var(--muted)}

.site-footer{margin-top:30px;padding:46px 0 24px;background:#21161f;color:#fff}
.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:36px}
.footer-logo{display:flex;align-items:center;gap:9px;color:#fff;text-decoration:none}
.footer-brand-block p{max-width:400px;color:#cbbfc7;font-size:13px}
.footer-brand-block .independent-note{color:#968791;font-size:11px}
.footer-links{display:flex;flex-direction:column;gap:7px}
.footer-links strong{font-size:13px;margin-bottom:4px;color:#fff}
.footer-links a{color:#cbbfc7;text-decoration:none;font-size:12px}
.footer-links a:hover{color:var(--mint)}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;margin-top:35px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);font-family:var(--mono);font-size:10px;color:#968791}

@media (max-width:900px){
  .primary-nav{display:none}
  .hero-section h1,.core-hero h1{font-size:42px}
  .version-tool-grid,.bit-tool-grid,.split-band{grid-template-columns:1fr}
  .process-grid{grid-template-columns:repeat(2,1fr)}
  .process-grid article:nth-child(2){border-right:0}
  .process-grid article:nth-child(-n+2){border-bottom:1px solid var(--line)}
  .related-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:repeat(2,1fr)}
  .footer-brand-block{grid-column:1/-1}
}

@media (max-width:620px){
  .wrap{width:min(calc(100% - 24px),1120px)}
  .topbar{min-height:64px}
  .brand img{width:40px;height:40px}
  .brand small{display:none}
  .hero-section,.core-hero{padding:42px 0 24px}
  .hero-section h1,.core-hero h1{font-size:36px;overflow-wrap:anywhere}
  .hero-lede,.core-hero>p{font-size:16px}
  .hero-actions .btn{width:100%}
  .tool-card{padding:15px}
  .tool-card-header{flex-direction:column;gap:12px}
  .tool-card-header h2{font-size:23px}
  .result-panel dl{grid-template-columns:1fr}
  .result-actions .btn{width:100%}
  .structure-row{align-items:flex-start}
  .section-intro h2,.content-heading h2,.split-band h2,.article-section h2{font-size:29px}
  .prose-columns{columns:1}
  .process-grid,.related-grid,.footer-grid{grid-template-columns:1fr}
  .process-grid article{border-right:0;border-bottom:1px solid var(--line)}
  .process-grid article:last-child{border-bottom:0}
  .segmented-control{grid-template-columns:repeat(2,1fr)}
  .command-row{align-items:flex-start}
  .footer-brand-block{grid-column:auto}
  .footer-bottom{flex-direction:column}
}