:root{
  --bg:#f7f8fb; --surface:#fff; --surface2:#eef1f7; --text:#161b2e; --muted:#5a6480; --line:#d9deea;
  --brand:#3b5bfd; --brand-ink:#fff; --brand-soft:#e8ecff; --ok:#0f9d6b; --ok-ink:#fff; --warn-bg:#fff6df; --warn-ink:#6b4b00; --err-bg:#ffe9ea; --err-ink:#8a1822;
  --radius:14px; --shadow:0 1px 2px rgba(20,30,70,.06),0 8px 28px rgba(20,30,70,.07);
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0e1220; --surface:#161c30; --surface2:#1d2540; --text:#eef1fb; --muted:#9aa5c7; --line:#2a3454;
  --brand:#7b92ff; --brand-ink:#0b1030; --brand-soft:#1f2850; --ok:#2dd4a0; --ok-ink:#052a1e; --warn-bg:#3a2e0d; --warn-ink:#ffe3a1; --err-bg:#3d151a; --err-ink:#ffc3c8;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 8px 28px rgba(0,0,0,.35);}}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
img,svg{max-width:100%;height:auto}
a{color:var(--brand);text-underline-offset:2px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:4px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:8px;top:-60px;background:var(--brand);color:var(--brand-ink);padding:10px 14px;border-radius:8px;z-index:50}
.skip:focus{top:8px}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
.narrow{max-width:860px}

/* header / footer */
.site-header{background:var(--surface);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:62px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--text);text-decoration:none;font-size:18px}
.brand img{width:30px;height:30px}
.brand-accent{color:var(--brand)}
/* collapsible navigation: hamburger below 860px, Guides dropdown above */
.site-header{position:relative;z-index:20}
.nav-toggle{display:none;background:transparent;border:1px solid var(--line);border-radius:10px;width:44px;height:44px;cursor:pointer;color:var(--text);align-items:center;justify-content:center}
.nav-toggle .bars,.nav-toggle .bars::before,.nav-toggle .bars::after{display:block;width:20px;height:2px;background:currentColor;border-radius:2px;position:relative;transition:transform .2s}
.nav-toggle .bars::before,.nav-toggle .bars::after{content:"";position:absolute;left:0}
.nav-toggle .bars::before{top:-6px}.nav-toggle .bars::after{top:6px}
.nav-toggle[aria-expanded=true] .bars{background:transparent}
.nav-toggle[aria-expanded=true] .bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded=true] .bars::after{top:0;transform:rotate(-45deg)}
.nav{display:flex;gap:4px 22px;align-items:center;font-size:15px}
.nav a{color:var(--muted);text-decoration:none;padding:8px 0}
.nav-group{position:relative;display:flex;align-items:center}
.sub-toggle{background:transparent;border:0;width:28px;height:32px;cursor:pointer;color:var(--muted);padding:0;margin-left:2px}
.sub-toggle::before{content:"";display:block;width:7px;height:7px;margin:-3px auto 0;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .2s}
.sub-toggle[aria-expanded=true]::before{transform:rotate(-135deg);margin-top:3px}
.nav-panel{display:none;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 20px;box-shadow:0 12px 32px rgba(10,16,40,.14)}
.nav-group.open .nav-panel{display:grid}
.nav-col ul{list-style:none;margin:0;padding:0}
.nav-col li a{display:block;padding:5px 0;font-size:14.5px}
.nav-h{margin:0 0 6px;font-size:12px;text-transform:uppercase;letter-spacing:.07em;color:var(--text);font-weight:700}
.nav-all{margin:12px 0 0;grid-column:1/-1;border-top:1px solid var(--line);padding-top:10px}
.nav-all a{font-weight:600;color:var(--brand)}
.nav-group.is-current>a{color:var(--text)}
@media (min-width:861px){
  .nav-panel{position:absolute;top:100%;right:-60px;width:min(760px,92vw);grid-template-columns:repeat(3,1fr);gap:8px 28px;margin-top:6px}
}
@media (max-width:860px){
  .nav-toggle{display:inline-flex}
  .nav{display:none;flex-direction:column;align-items:stretch;gap:0;width:100%;padding:6px 0 14px;border-top:1px solid var(--line)}
  .nav.open{display:flex}
  .nav>a,.nav-group>a{padding:12px 4px;font-size:16px;border-bottom:1px solid var(--line)}
  .nav-group{flex-wrap:wrap;align-items:stretch}
  .nav-group>a{flex:1}
  .sub-toggle{width:48px;height:auto;border-bottom:1px solid var(--line)}
  .nav-panel{width:100%;box-shadow:none;border:0;border-radius:0;padding:4px 4px 8px;grid-template-columns:1fr;gap:10px;background:var(--surface2)}
  .nav-col li a{padding:9px 6px}
}
.nav a:hover,.nav a[aria-current=page]{color:var(--text)}
.nav a[aria-current=page]{font-weight:600}
.site-footer{margin-top:64px;background:var(--surface);border-top:1px solid var(--line);padding:36px 0 28px;font-size:15px;color:var(--muted)}
.foot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:28px}
.site-footer h2{font-size:14px;text-transform:uppercase;letter-spacing:.06em;color:var(--text);margin:0 0 10px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:6px 0}
.site-footer a{color:var(--muted)}
.site-footer a:hover{color:var(--text)}
.fine{margin-top:26px;padding-top:18px;border-top:1px solid var(--line);font-size:13.5px}

/* hero */
.hero{padding:40px 0 8px;text-align:center}
.crumbs{font-size:14px;color:var(--muted);margin:18px 0 0}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0;padding:0}
.crumbs li+li::before{content:"›";margin-right:6px;color:var(--muted)}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(28px,4.6vw,44px);line-height:1.15;margin:.2em 0 .35em;letter-spacing:-.02em}
.lead{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:720px;margin:0 auto 22px}
.badges{display:flex;flex-wrap:wrap;gap:8px 10px;justify-content:center;list-style:none;margin:0 0 26px;padding:0}
.badges li{background:var(--brand-soft);color:var(--text);border-radius:999px;padding:6px 14px;font-size:14px;font-weight:600}

/* tool */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;max-width:860px;margin:0 auto;text-align:left}
.dz-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:700px){.dz-grid{grid-template-columns:1fr}}
.dz{position:relative;display:block;border:2px dashed var(--line);border-radius:12px;padding:20px 16px;background:var(--surface2);cursor:pointer;transition:border-color .15s,background .15s;min-height:132px}
.dz:hover,.dz.drag{border-color:var(--brand);background:var(--brand-soft)}
.dz:focus-within{outline:3px solid var(--brand);outline-offset:2px}
.dz.has-file{border-style:solid;border-color:var(--ok)}
.dz input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%}
.dz-step{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--brand);color:var(--brand-ink);font-weight:700;font-size:14px;margin-right:8px}
.dz-title{font-weight:700;display:block;margin-bottom:6px}
.dz-name{display:block;font-size:14.5px;color:var(--muted);word-break:break-all}
.dz-hint{display:block;font-size:13.5px;color:var(--muted);margin-top:8px}
.actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:18px}
.btn{font:inherit;font-weight:700;border:0;border-radius:10px;padding:13px 26px;cursor:pointer;background:var(--brand);color:var(--brand-ink)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn-ok{background:var(--ok);color:var(--ok-ink)}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--line);font-weight:600;padding:11px 18px}
.status{font-size:14.5px;color:var(--muted);min-height:1.4em}
.bar{height:8px;background:var(--surface2);border-radius:6px;overflow:hidden;margin-top:14px}
.bar>i{display:block;height:100%;width:0;background:var(--brand);transition:width .2s}
.msg{border-radius:10px;padding:12px 14px;margin-top:14px;font-size:15px}
.msg.err{background:var(--err-bg);color:var(--err-ink)}
.msg.info{background:var(--brand-soft);color:var(--text)}
.msg.warn{background:var(--warn-bg);color:var(--warn-ink)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:18px 0 14px}
.stat{background:var(--surface2);border-radius:10px;padding:12px 14px}
.stat strong{display:block;font-size:19px}
.stat span{font-size:13px;color:var(--muted)}
.small{font-size:14px;color:var(--muted)}
details.logbox{margin-top:16px;border:1px solid var(--line);border-radius:10px;padding:8px 14px}
details.logbox summary{cursor:pointer;font-weight:600;font-size:15px}
pre.log{font:13px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--surface2);padding:12px;border-radius:8px;max-height:220px;overflow:auto;white-space:pre-wrap;margin:10px 0 6px}
.privacy-line{margin:16px 0 0;font-size:14px;color:var(--muted);display:flex;gap:8px;align-items:flex-start}
.privacy-line b{color:var(--text)}

/* content */
main section{margin:0}
.content{padding-top:48px}
.content h2{font-size:clamp(23px,3vw,30px);line-height:1.25;margin:2.2em 0 .6em;letter-spacing:-.01em}
.content h2:first-child{margin-top:0}
.content h3{font-size:19px;margin:1.6em 0 .4em}
.content p,.content li{max-width:75ch}
.content ul,.content ol{padding-left:1.3em}
.content li{margin:.4em 0}
.steps{counter-reset:s;list-style:none;padding:0}
.steps>li{counter-increment:s;position:relative;padding:14px 16px 14px 62px;background:var(--surface);border:1px solid var(--line);border-radius:12px;margin:12px 0;max-width:none}
.steps>li::before{content:counter(s);position:absolute;left:16px;top:14px;width:32px;height:32px;display:grid;place-items:center;background:var(--brand);color:var(--brand-ink);font-weight:700;border-radius:50%}
.steps strong{display:block}
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:14px;margin:18px 0;padding:0;list-style:none}
.cards li{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px;margin:0;max-width:none}
.cards b{display:block;margin-bottom:4px}
.callout{background:var(--brand-soft);border-radius:12px;padding:16px 18px;margin:20px 0}
.callout.warn{background:var(--warn-bg);color:var(--warn-ink)}
table.cmp{width:100%;border-collapse:collapse;font-size:15.5px;margin:18px 0;background:var(--surface);border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.cmp th,.cmp td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.cmp thead th{background:var(--surface2)}
.tbl-scroll{overflow-x:auto}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:4px 16px;margin:10px 0}
.faq summary{cursor:pointer;font-weight:600;padding:12px 0;list-style-position:outside}
.faq details[open] summary{margin-bottom:2px}
.faq p{margin:.2em 0 1em}
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:12px;list-style:none;padding:0}
.related li{margin:0;max-width:none}
.related a{display:block;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;text-decoration:none;color:var(--text);font-weight:600}
.related a small{display:block;color:var(--muted);font-weight:400;margin-top:2px}
.related a:hover{border-color:var(--brand)}
code{background:var(--surface2);padding:2px 6px;border-radius:5px;font-size:.92em}
.updated{font-size:14px;color:var(--muted)}
.ad{margin:34px 0;min-height:280px;text-align:center;background:var(--surface2);border-radius:12px;padding:8px}
.ad-label{display:block;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
[hidden]{display:none!important}
@media print{.site-header,.site-footer,.tool{display:none}}

.hero-cta{margin:18px 0 0}.hero-cta .btn,.cta-box .btn{display:inline-block;text-decoration:none}
.cta-box{display:flex;flex-wrap:wrap;gap:12px 18px;align-items:center;margin:34px 0}.cta-box .btn{margin-left:auto}
.guide-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:14px;list-style:none;padding:0}
.tool-h{font-size:22px;text-align:center;margin:0 0 14px}
figure.shot{margin:24px 0}figure.shot img{display:block;max-width:100%;height:auto;border:1px solid var(--line);border-radius:12px}figure.shot figcaption{font-size:14px;color:var(--muted);margin-top:8px}
pre.out{background:var(--surface2);border-radius:10px;padding:12px 14px;overflow:auto;font:13px/1.55 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:pre-wrap}

.brand-img{display:block;width:100%;max-width:460px;height:auto;margin:28px auto;background:#fff;border-radius:16px;border:1px solid var(--line)}