:root { --fg: #1f2328; --muted: #6a737d; --line: #d0d7de; --bg: #f6f8fa; --card: #fff;
        --accent: #0969da; --err: #cf222e; --ok: #1a7f37; --hl: #fff8c5; }
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
       color: var(--fg); background: var(--bg); }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px 20px;
          background: var(--card); border-bottom: 1px solid var(--line); }
.topbar nav a { margin-right: 16px; color: var(--fg); text-decoration: none; }
.topbar nav a.active { color: var(--accent); font-weight: 600; }
.who { display: flex; gap: 12px; align-items: center; color: var(--muted); }
main { max-width: 980px; margin: 20px auto; padding: 0 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 16px 20px; margin-bottom: 16px; }
h2 { font-size: 17px; margin: 0 0 8px; }
button { font: inherit; padding: 5px 14px; border-radius: 6px; border: 1px solid var(--accent); background: var(--accent);
         color: #fff; cursor: pointer; }
button.secondary { background: #fff; color: var(--fg); border-color: var(--line); }
button.link { background: none; border: none; color: var(--accent); padding: 0; }
button:disabled { opacity: .5; cursor: not-allowed; }
input, select, textarea { font: inherit; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; }
.hint { color: var(--muted); }
.error { color: var(--err); }
.money-neg { color: var(--err); }
.drop-zone { border: 2px dashed var(--line); border-radius: 8px; padding: 24px; text-align: center; }
.drop-zone.over { border-color: var(--accent); background: #f0f7ff; }
.progress { height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; margin: 8px 0; }
.progress > div { height: 100%; width: 0; background: var(--accent); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 8px 0; }
.segments { list-style: none; padding: 0; margin: 12px 0 0; }
.segments li { padding: 8px 4px; border-bottom: 1px solid var(--bg); }
.segments li.active { background: var(--hl); }
.segments .time { color: var(--muted); font-variant-numeric: tabular-nums; margin-right: 6px; }
.segments .play { padding: 0 8px; margin-right: 6px; }
.segments .lang { display: inline-block; min-width: 1.5em; color: var(--muted); }
.segments .zh { color: var(--ok); padding-left: 6em; }
table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 6px 8px; border-bottom: 1px solid var(--bg); vertical-align: top; }
tr.clickable { cursor: pointer; }
tr.clickable:hover { background: var(--bg); }
.login-card { max-width: 360px; margin: 12vh auto; }
.login-card label { display: block; margin: 10px 0; }
.login-card input { width: 100%; }
.notice { text-align: center; margin-top: 20vh; }
textarea { width: 100%; }
.pieces { list-style: none; padding: 0; }
.piece { border-bottom: 1px solid var(--bg); padding: 8px 0; }
.piece-src { color: var(--muted); white-space: pre-wrap; }
.piece-out { white-space: pre-wrap; }
.form-row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin: 8px 0; }