:root{--soft:#f4f6fb;--ink:#14213d;--mute:#5b6478;--line:#e0e5f0;--brand:#2563eb;--brand2:#1d4ed8;--sun:#f59e0b}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,Tahoma,sans-serif;color:var(--ink);line-height:1.7;background:#fff;-webkit-text-size-adjust:100%}
a{color:var(--brand)}
h1,h2,h3,p{margin:0}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
header.top{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:20}
.bar{display:flex;align-items:center;gap:18px;padding:12px 0}
.logo{font-weight:800;font-size:22px;color:var(--ink);text-decoration:none;margin-inline-end:auto}
.logo b{color:var(--brand)}
.nav{display:flex;gap:16px;align-items:center;font-size:15px}
.nav a{color:var(--ink);text-decoration:none}
.nav a:hover{color:var(--brand)}
.nav .langsw{border:1px solid var(--line);padding:3px 12px;border-radius:999px}
.toolbar{background:var(--soft);border-bottom:1px solid var(--line)}
.toolbar .wrap{display:flex;gap:8px;overflow-x:auto;padding-top:10px;padding-bottom:10px}
.chip{white-space:nowrap;padding:6px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink);text-decoration:none;font-size:14px;font-weight:600}
.chip:hover{border-color:var(--brand)}
.chip[aria-current=page]{background:var(--brand);color:#fff;border-color:var(--brand)}
.hero{background:linear-gradient(180deg,#eef3ff,#fff);padding:34px 0 18px;text-align:center}
.hero h1{font-size:clamp(28px,4.4vw,42px);line-height:1.2;margin-bottom:10px}
.lead{color:var(--mute);font-size:18px;max-width:700px;margin:0 auto 22px}
.app{max-width:720px;margin:0 auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:12px;box-shadow:0 10px 30px rgba(20,33,61,.08)}
.state{display:none;flex-direction:column;align-items:center;justify-content:center;gap:12px;min-height:240px;padding:26px 16px;border:2px dashed #b9c6ea;border-radius:12px;text-align:center}
.app[data-state=idle] .s-idle,.app[data-state=busy] .s-busy,.app[data-state=done] .s-done,.app[data-state=error] .s-error{display:flex}
.state.over{background:#eef3ff;border-color:var(--brand)}
.state svg{width:48px;height:48px}
.big{font-size:20px;font-weight:700}
.small{font-size:14px;color:var(--mute)}
.btn{font:inherit;font-weight:700;font-size:18px;border:0;border-radius:10px;padding:12px 30px;cursor:pointer;background:var(--brand);color:#fff;text-decoration:none;display:inline-block}
.btn:hover{background:var(--brand2)}
.btn.ghost{background:#fff;color:var(--ink);border:1px solid var(--line);font-size:16px;padding:9px 20px}
input[type=file]{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.progress{width:min(380px,100%);height:10px;border-radius:99px;background:var(--soft);overflow:hidden}
.progress i{display:block;height:100%;width:0;background:var(--brand);transition:width .2s}
.s-done svg{color:#0f8a5f}.s-error svg{color:#c2272d}
#errMsg{max-width:460px}
.quota{margin-top:12px;font-size:14px;color:var(--mute)}
.note{margin:6px 0 0;font-size:13px;color:var(--mute)}
.content{max-width:820px;margin:0 auto;padding:24px 18px 10px}
.content h2{font-size:24px;line-height:1.3;margin:30px 0 10px}
.content p{margin:0 0 14px}
.content ul,.content ol{margin:0 0 14px;padding-inline-start:24px}
.content li{margin-bottom:6px}
.content .card{background:var(--soft);border-radius:12px;padding:16px 18px;margin:0 0 14px}
details{border-bottom:1px solid var(--line);padding:12px 2px}
summary{cursor:pointer;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:22px;line-height:1;color:var(--brand)}
details[open] summary::after{content:"\2212"}
details p{margin:8px 0 0;color:var(--mute)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.tcard{display:block;border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;color:var(--ink);background:#fff}
.tcard:hover{border-color:var(--brand);box-shadow:0 6px 18px rgba(37,99,235,.12)}
.tcard b{display:block;font-size:18px;margin-bottom:4px}
.tcard span{color:var(--mute);font-size:15px}
.feats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.feats div{background:var(--soft);border-radius:12px;padding:16px 18px}
.feats b{display:block;margin-bottom:4px}
.feats span{color:var(--mute);font-size:15px}
.wide{max-width:1040px}
footer.foot{margin-top:40px;background:#0f1a33;color:#c3cde6;padding:30px 0 22px;font-size:14px}
footer.foot a{color:#fff;text-decoration:none}
footer.foot a:hover{text-decoration:underline}
.fcols{display:flex;flex-wrap:wrap;gap:24px 60px}
.fcols h3{font-size:14px;color:#fff;margin-bottom:8px}
.fcols a{display:block;margin-bottom:4px}
.fine{margin-top:18px;font-size:12.5px;opacity:.8}
@media (max-width:760px){.grid{grid-template-columns:repeat(2,1fr)}.feats{grid-template-columns:1fr}.nav .hide-s{display:none}}
@media (max-width:480px){.grid{grid-template-columns:1fr}.state{min-height:210px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}