:root { --fg: #e8eef5; --dim: #93a4b8; --bg: #10151c; --panel: #171e28; --line: #2a3543; --acc: #6cc4ff; }
* { box-sizing: border-box; }
body { margin: 0; font: 14px/1.6 "Segoe UI", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--fg); }
header { padding: 18px 22px 10px; border-bottom: 1px solid var(--line); }
h1 { margin: 0 0 4px; font-size: 19px; }
.sub { margin: 0; color: var(--dim); font-size: 12.5px; }
nav { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px 22px; border-bottom: 1px solid var(--line); }
nav button { background: var(--panel); color: var(--fg); border: 1px solid var(--line); border-radius: 6px; padding: 7px 13px; cursor: pointer; font-size: 13px; }
nav button:hover { border-color: var(--acc); }
main { display: grid; grid-template-columns: 1fr 340px; gap: 0; align-items: stretch; }
#stage { position: relative; min-height: 520px; }
#view { width: 100%; height: 100%; display: block; }
#hud { position: absolute; left: 0; right: 0; bottom: 0; display: flex; align-items: center; gap: 10px; padding: 8px 12px; background: rgba(10,14,20,.78); border-top: 1px solid var(--line); }
#hud button { background: #22303f; color: var(--fg); border: 1px solid var(--line); border-radius: 5px; padding: 5px 10px; cursor: pointer; }
#seek { flex: 1; }
#clock, #fps { font-variant-numeric: tabular-nums; color: var(--dim); font-size: 12px; white-space: nowrap; }
aside { border-left: 1px solid var(--line); padding: 14px 16px; background: var(--panel); max-height: 78vh; overflow: auto; }
aside h2 { font-size: 15px; margin: 0 0 10px; }
aside h3 { font-size: 12.5px; margin: 18px 0 6px; color: var(--dim); text-transform: uppercase; letter-spacing: .04em; }
dl { display: grid; grid-template-columns: 88px 1fr; gap: 3px 10px; margin: 0; font-size: 12.5px; }
dt { color: var(--dim); }
dd { margin: 0; word-break: break-all; }
ul { margin: 0; padding-left: 16px; font-size: 12.5px; color: var(--dim); }
#notes p { margin: 0 0 8px; font-size: 12.5px; }
.warn { color: #ffd479; }
footer { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; padding: 10px 22px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--dim); }
.chk { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.tip code, code { background: #0c1118; border: 1px solid var(--line); border-radius: 4px; padding: 1px 5px; font-size: 12px; }
@media (max-width: 900px) { main { grid-template-columns: 1fr; } aside { border-left: 0; border-top: 1px solid var(--line); } }

.approx-banner {
  margin: 8px 0 0;
  padding: 6px 10px;
  display: inline-block;
  background: #3a2a12;
  border: 1px solid #c9a227;
  color: #ffd479;
  border-radius: 6px;
  font-size: 12.5px;
}
footer select {
  background: #0c1118;
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2px 6px;
  margin-left: 4px;
}