:root{color-scheme:light dark;--bg:#f3f5f8;--card:#fff;--fg:#14202e;--line:#d6dde6;--muted:#5b6b7c;--accent:#1b57bb;--danger:#c0352b}
@media (prefers-color-scheme:dark){:root{--bg:#0f1720;--card:#17212d;--fg:#e8eef5;--line:#2c3b4c;--muted:#9cadbf;--accent:#6ea2f5;--danger:#ef6a5e}}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--fg);font:15px/1.5 -apple-system,"PingFang SC","Microsoft YaHei",sans-serif}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:24px}
.narrow{max-width:380px;margin:12vh auto 0}
h1{font-size:20px;margin:0 0 14px}h2{font-size:15px;margin:0}
label{display:block;margin:0 0 12px}label span{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
input,select{width:100%;height:38px;padding:0 10px;border-radius:8px;border:1px solid var(--line);background:transparent;color:inherit;font:inherit}
button{height:38px;padding:0 14px;border:0;border-radius:8px;background:var(--accent);color:#fff;font:inherit;cursor:pointer}
button:disabled{opacity:.5;cursor:default}button.plain{background:transparent;color:var(--muted);margin-top:8px;padding:0}button.danger{background:var(--danger)}
.error{color:var(--danger);min-height:1.5em;margin:8px 0 0;font-size:13px}.note{color:var(--muted);font-size:12px;margin:4px 0 0}
#stage{display:grid;grid-template-columns:minmax(0,1fr) 320px;height:100vh}
.view{background:#000;display:flex;align-items:center;justify-content:center;position:relative;min-width:0}
video{width:100%;height:100%;max-height:100vh;object-fit:contain;outline:none}.view p{position:absolute;color:#cdd7e2}
.side{background:var(--card);border-left:1px solid var(--line);padding:16px;display:flex;flex-direction:column;gap:10px;min-height:0}
.row{display:flex;flex-wrap:wrap;gap:6px}.row button{flex:1 1 auto;height:34px;font-size:13px;padding:0 8px}
pre{flex:1;min-height:80px;margin:0;overflow:auto;background:var(--bg);border-radius:8px;padding:8px;font-size:12px;white-space:pre-wrap;word-break:break-word}
.check{display:flex;gap:8px;align-items:center}.check input{width:auto;height:auto}.check span{margin:0;color:inherit}
@media (max-width:820px){#stage{grid-template-columns:1fr;grid-template-rows:55vh 1fr;height:auto;min-height:100vh}.side{border-left:0}}