:root{--bg:#f6f7fb;--fg:#1b1f2a;--mut:#5b6475;--card:#fff;--line:#dfe3ec;--pri:#3b5bdb;--hot:#e03131;--r:12px}
@media(prefers-color-scheme:dark){:root{--bg:#12141a;--fg:#eceff6;--mut:#9aa3b5;--card:#1b1e27;--line:#2c3140;--pri:#7c93ff}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
.bar{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;max-width:760px;margin:auto}
.brand{display:flex;gap:8px;align-items:center;font-weight:700;color:inherit;text-decoration:none}
main{max-width:760px;margin:0 auto;padding:0 16px 32px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;margin-bottom:16px}
h1{font-size:1.6rem;margin:0 0 8px}h2{font-size:1.2rem;margin:0 0 8px}
.lead{color:var(--mut);margin-top:0}.muted{color:var(--mut);font-size:.9rem}
.err{color:var(--hot)}
label{display:block;margin:12px 0;font-weight:600;font-size:.9rem}
input,textarea,select{width:100%;margin-top:4px;padding:10px;border:1px solid var(--line);border-radius:8px;background:var(--bg);color:var(--fg);font:inherit}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}.row>label{flex:1;min-width:160px}
button,.btn{font:inherit;padding:10px 18px;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--fg);cursor:pointer;text-decoration:none;display:inline-block}
.primary{background:var(--pri);border-color:var(--pri);color:#fff;font-weight:600}
.ghost{background:transparent}
button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,.drop:focus-visible{outline:3px solid var(--pri);outline-offset:2px}
.drop{display:flex;flex-direction:column;gap:4px;align-items:center;text-align:center;padding:36px 16px;border:2px dashed var(--line);border-radius:var(--r);cursor:pointer}
.drop.over{border-color:var(--pri);background:var(--bg)}.drop span{color:var(--mut);font-size:.9rem}
.stage{position:relative;line-height:0;border:1px solid var(--line);border-radius:8px;overflow:hidden;touch-action:none;cursor:crosshair;user-select:none}
.stage img{width:100%;height:auto;display:block;-webkit-user-drag:none}
.box{position:absolute;border:3px solid var(--hot);background:rgba(224,49,49,.14);border-radius:4px;box-shadow:0 0 0 2px #fff8}
.box b{position:absolute;top:-1px;left:-1px;background:var(--hot);color:#fff;font:700 12px/1 system-ui;padding:4px 6px;border-radius:3px}
.list{list-style:none;padding:0;margin:0}.list li{display:flex;justify-content:space-between;gap:8px;padding:8px 0;border-top:1px solid var(--line)}
dl{display:grid;grid-template-columns:max-content 1fr;gap:4px 14px;margin:0}dt{color:var(--mut)}dd{margin:0;word-break:break-word}
pre{background:var(--bg);padding:10px;border-radius:8px;overflow:auto;font-size:.85rem;white-space:pre-wrap}
footer{text-align:center;color:var(--mut);font-size:.85rem;padding:16px}footer a{color:inherit}
dialog{border:1px solid var(--line);border-radius:var(--r);background:var(--card);color:var(--fg);max-width:420px}
@media(prefers-reduced-motion:no-preference){.card{animation:in .25s ease}@keyframes in{from{opacity:0;transform:translateY(6px)}}}
a{color:var(--pri)}
.brand,.btn{color:inherit}