/* 1. Tokens */
:root{--bg:#f7f8fb;--card:#fff;--ink:#14171f;--mute:#5b6270;--line:#d9dde6;--accent:#1d4ed8;--accent-ink:#fff;--ok:#067647;--err:#b42318;--sans:"Inter",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
@media (prefers-color-scheme:dark){:root{--bg:#0f1218;--card:#171b24;--ink:#eef0f5;--mute:#9aa3b2;--line:#2a3140;--accent:#6b9bff;--accent-ink:#0b1020;--ok:#47cd89;--err:#f97066}}
/* 2. Base */
*,*::before,*::after{box-sizing:border-box;margin:0}
html{-webkit-text-size-adjust:100%}
body{font-family:var(--sans);background:var(--bg);color:var(--ink);line-height:1.6;overflow-x:clip}
a{color:var(--accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
.skip-link{position:fixed;top:-100px;left:1rem;padding:.6rem 1rem;background:var(--card);z-index:9;border-radius:8px}
.skip-link:focus{top:1rem}
.wrap{max-width:760px;margin:0 auto;padding:0 1rem}
/* 3. Header / footer */
header{border-bottom:1px solid var(--line);background:var(--card)}
header .wrap{display:flex;justify-content:space-between;align-items:center;height:52px}
.brand{font-weight:700;text-decoration:none;color:var(--ink)}
header nav a{font-size:.9rem;color:var(--mute);text-decoration:none}
footer{margin-top:3rem;padding:1.5rem 0;border-top:1px solid var(--line);color:var(--mute);font-size:.85rem}
footer a{margin-right:1rem}
/* 4. Tool */
h1{font-size:clamp(1.6rem,5vw,2.3rem);line-height:1.15;letter-spacing:-.02em;margin:1.5rem 0 .4rem}
.sub{color:var(--mute);margin-bottom:1rem}
.tool-card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:1rem}
.drop{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.4rem;min-height:170px;border:2px dashed var(--line);border-radius:10px;cursor:pointer;text-align:center;padding:1rem}
.drop.over,.drop:hover{border-color:var(--accent)}
.drop strong{font-size:1.1rem}
.drop small{color:var(--mute)}
.btn{display:inline-block;background:var(--accent);color:var(--accent-ink);font-weight:600;padding:.8rem 1.2rem;border-radius:10px;font-size:1rem;border:0;cursor:pointer}
.btn.big{width:100%;font-size:1.15rem;padding:1rem}
.panel{display:none;text-align:center;padding:1.2rem .5rem}
[data-state=idle] .p-idle,[data-state=loading] .p-busy,[data-state=working] .p-busy,[data-state=done] .p-done,[data-state=error] .p-err{display:block}
.bar{height:6px;background:var(--line);border-radius:3px;overflow:hidden;margin:.8rem auto 0;max-width:320px}
.bar i{display:block;height:100%;width:40%;background:var(--accent);animation:slide 1.1s ease-in-out infinite}
@keyframes slide{0%{margin-left:-40%}100%{margin-left:100%}}
.p-done .meta{color:var(--ok);font-weight:600;margin-bottom:.8rem}
.p-err .meta{color:var(--err);margin-bottom:.8rem}
.p-done .notes{color:var(--mute);font-size:.85rem;margin-top:.6rem}
.link{display:inline-block;margin-top:.8rem;font-size:.9rem;color:var(--mute)}
.badge{margin-top:.8rem;font-size:.88rem;color:var(--mute)}
.badge b{color:var(--ink)}
.ad-slot{min-height:90px;margin:1.5rem 0;border:1px dashed var(--line);border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--mute);font-size:.75rem}
/* 5. Content */
section h2{font-size:1.3rem;margin:2rem 0 .6rem}
section p,section li{color:var(--mute);margin-bottom:.6rem}
ol.steps{padding-left:1.2rem}
details{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:.7rem 1rem;margin-bottom:.5rem}
summary{cursor:pointer;font-weight:600}
details p{margin:.5rem 0 0}
.noscript{padding:1rem;color:var(--err)}