:root{
  --bg:#f7f8fa;--surface:#fff;--surface-2:#f0f2f5;--text:#14171f;--muted:#5b6475;
  --border:#e2e5ea;--brand:#2459e0;--brand-ink:#fff;--brand-soft:#e8eefc;
  --ok:#137a43;--ok-soft:#e5f5ec;--warn:#9a5b00;--warn-soft:#fff4e0;--err:#b42318;--err-soft:#fdecea;
  --radius:12px;--shadow:0 1px 2px rgba(16,24,40,.06),0 1px 3px rgba(16,24,40,.08);
  --font:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans",sans-serif;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#0f1218;--surface:#171b23;--surface-2:#1f2430;--text:#e8ebf1;--muted:#9aa3b5;
  --border:#2a303c;--brand:#6d93ff;--brand-ink:#0b1020;--brand-soft:#1c2540;
  --ok:#4cc38a;--ok-soft:#14291f;--warn:#f0b357;--warn-soft:#2c2414;--err:#ff8a80;--err-soft:#2e1816;}
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:16px/1.6 var(--font)}
img,canvas{max-width:100%;height:auto}
a{color:var(--brand)}
a:hover{text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 16px}
.skip{position:absolute;left:-999px}.skip:focus{left:16px;top:8px;background:var(--surface);padding:8px;z-index:10}

/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:5}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;min-height:60px;gap:12px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem;color:var(--text);text-decoration:none}
.logo-mark{width:30px;height:30px;border-radius:8px;background:var(--brand);color:var(--brand-ink);display:grid;place-items:center;font-size:.9rem}
.nav{display:flex;gap:4px}
.nav a{color:var(--text);text-decoration:none;padding:8px 12px;border-radius:8px;font-size:.95rem}
.nav a:hover,.nav a[aria-current="page"]{background:var(--surface-2)}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:8px;padding:6px 10px;color:var(--text);font:inherit}
@media (max-width:760px){
  .nav-toggle{display:block}
  .nav{display:none;position:absolute;top:60px;left:0;right:0;background:var(--surface);flex-direction:column;padding:8px 16px 16px;border-bottom:1px solid var(--border)}
  .nav.open{display:flex}
}

/* page */
main{padding:20px 0 48px}
.crumbs{font-size:.85rem;color:var(--muted);margin:0 0 12px;padding:0;list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li::before{content:"›";margin-right:6px}
.crumbs a{color:var(--muted)}
h1{font-size:clamp(1.6rem,4vw,2.2rem);line-height:1.2;margin:0 0 8px}
h2{font-size:1.35rem;line-height:1.3;margin:36px 0 12px}
h3{font-size:1.05rem;margin:20px 0 6px}
.lead{color:var(--muted);font-size:1.05rem;margin:0 0 20px;max-width:760px}
.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 20px}
.badge{font-size:.8rem;background:var(--ok-soft);color:var(--ok);padding:4px 10px;border-radius:999px;font-weight:600}

/* tool card */
.tool{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.drop{display:block;position:relative;overflow:hidden;border:2px dashed var(--border);border-radius:var(--radius);padding:32px 16px;text-align:center;cursor:pointer;background:var(--surface-2);transition:border-color .15s,background .15s}
.drop:hover,.drop.over{border-color:var(--brand);background:var(--brand-soft)}
.drop strong{display:block;font-size:1.1rem;margin-bottom:4px}
.drop span{color:var(--muted);font-size:.9rem}
.drop input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;background:var(--brand);color:var(--brand-ink);border:0;border-radius:10px;padding:11px 18px;font:600 1rem var(--font);cursor:pointer;text-decoration:none;min-height:44px}
.btn:hover{filter:brightness(1.08)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.secondary{background:var(--surface-2);color:var(--text);border:1px solid var(--border)}
.btn.small{padding:6px 10px;font-size:.85rem;min-height:34px}
.row{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-top:16px}
.field{display:flex;flex-direction:column;gap:4px;min-width:120px;flex:1}
.field label{font-size:.85rem;font-weight:600;color:var(--muted)}
.field input,.field select,.field textarea{font:inherit;color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:10px;min-height:44px;width:100%}
.field textarea{min-height:90px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:2px solid var(--brand);outline-offset:1px}
.check{display:flex;align-items:center;gap:8px;font-size:.95rem}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chip{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:999px;padding:6px 12px;font:inherit;font-size:.9rem;cursor:pointer}
.chip.active,.chip:hover{border-color:var(--brand);background:var(--brand-soft)}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.msg{margin-top:14px;padding:10px 14px;border-radius:8px;font-size:.95rem;display:none}
.msg.show{display:block}
.msg.ok{background:var(--ok-soft);color:var(--ok)}
.msg.warn{background:var(--warn-soft);color:var(--warn)}
.msg.err{background:var(--err-soft);color:var(--err)}
.progress{height:6px;background:var(--surface-2);border-radius:99px;overflow:hidden;margin-top:14px;display:none}
.progress.show{display:block}
.progress i{display:block;height:100%;width:0;background:var(--brand);transition:width .2s}

/* file list */
.files{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}
.files li{display:flex;align-items:center;gap:10px;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:8px 10px}
.files .thumb{width:44px;height:44px;border-radius:6px;object-fit:cover;background:var(--surface);flex:none}
.files .meta{flex:1;min-width:0;font-size:.9rem}
.files .name{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:600}
.files .sub{color:var(--muted);font-size:.8rem}
.files .ctrl{display:flex;gap:4px;flex:none}
.icon-btn{background:var(--surface);border:1px solid var(--border);border-radius:6px;width:34px;height:34px;cursor:pointer;color:var(--text);font-size:1rem}

/* results */
.result{margin-top:18px;display:none}
.result.show{display:block}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:560px){.compare{grid-template-columns:1fr}}
.compare figure{margin:0;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:10px;text-align:center}
.compare img{max-height:260px;object-fit:contain}
.compare figcaption{font-size:.85rem;color:var(--muted);margin-top:6px}
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px;margin-top:16px}
.stat{background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:12px}
.stat b{display:block;font-size:1.35rem;line-height:1.2;font-variant-numeric:tabular-nums}
.stat span{font-size:.82rem;color:var(--muted)}
.stat.hero{background:var(--brand-soft);border-color:transparent}
.thumb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px;margin-top:14px}
.thumb-grid figure{margin:0;background:var(--surface-2);border:1px solid var(--border);border-radius:8px;padding:6px;text-align:center;font-size:.8rem}
.thumb-grid img{display:block;margin:0 auto 6px;max-height:160px}
table.data{width:100%;border-collapse:collapse;font-size:.9rem;margin-top:12px;font-variant-numeric:tabular-nums}
table.data th,table.data td{border-bottom:1px solid var(--border);padding:8px;text-align:right}
table.data th:first-child,table.data td:first-child{text-align:left}
.table-scroll{overflow-x:auto}
.donut{width:150px;height:150px;border-radius:50%;margin:0 auto;position:relative}
.donut::after{content:"";position:absolute;inset:28px;background:var(--surface);border-radius:50%}
.legend{display:flex;justify-content:center;gap:16px;font-size:.85rem;margin-top:10px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:2px;margin-right:6px;vertical-align:middle}
.qr-out{display:flex;flex-direction:column;align-items:center;gap:12px}
.qr-out canvas{background:#fff;border:1px solid var(--border);border-radius:8px;max-width:280px}
.two-col{display:grid;grid-template-columns:1.2fr 1fr;gap:20px}
@media (max-width:760px){.two-col{grid-template-columns:1fr}}

/* content */
.content{max-width:780px}
.content p,.content li{color:var(--text)}
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{counter-increment:s;position:relative;padding:0 0 12px 44px}
.steps li::before{content:counter(s);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;font-weight:700;font-size:.9rem}
.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}
.feature-grid div{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:14px}
.feature-grid h3{margin:0 0 4px;font-size:1rem}
.feature-grid p{margin:0;font-size:.92rem;color:var(--muted)}
.faq details{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:12px 16px;margin-bottom:8px}
.faq summary{font-weight:600;cursor:pointer}
.faq details p{margin:8px 0 0;color:var(--muted)}
.note{background:var(--warn-soft);color:var(--warn);padding:10px 14px;border-radius:8px;font-size:.92rem}

/* tool grids */
.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.tool-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;text-decoration:none;color:var(--text);transition:border-color .15s,transform .15s}
.tool-card:hover{border-color:var(--brand);transform:translateY(-2px)}
.tool-card .ico{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;font-size:1.1rem;margin-bottom:8px;background:var(--brand-soft)}
.tool-card b{display:block}
.tool-card span{font-size:.88rem;color:var(--muted)}
.home-hero{padding:28px 0 8px}
.home-hero h1{font-size:clamp(1.8rem,5vw,2.6rem)}
.search{margin:16px 0 8px;max-width:520px}
.search input{width:100%;font:inherit;padding:12px 14px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--text);min-height:48px}

/* ads */
.ad{margin:28px 0;min-height:100px;text-align:center}
.ad-label{font-size:.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}

/* footer */
.site-footer{border-top:1px solid var(--border);background:var(--surface);padding:32px 0;font-size:.9rem;color:var(--muted)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:20px}
.site-footer h4{color:var(--text);margin:0 0 8px;font-size:.95rem}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:4px 0}
.site-footer a{color:var(--muted);text-decoration:none}
.site-footer a:hover{color:var(--brand)}
.copy{margin-top:24px;border-top:1px solid var(--border);padding-top:16px}
.prose{max-width:760px}
.prose h2{font-size:1.2rem}