:root {
  --bg: #ffffff; --fg: #1d1d1f; --fg2: #555a60; --fg3: #80868d; --line: #e3e5e8; --card: #f6f7f9;
  --accent: #2f6fdf; --good: #1f8a5b; --bad: #c2453d; --warn: #b7791f; --view: #e9ecf0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141518; --fg: #ececee; --fg2: #b4b8be; --fg3: #8a9097; --line: #2a2d33; --card: #1c1e22;
    --accent: #6aa0ff; --good: #4cc08a; --bad: #ef7a72; --warn: #e3b25a; --view: #202329;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.7 -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
a { color: var(--accent); }
main { max-width: 1440px; margin: 0 auto; padding: 32px 24px 80px; }
.back { font-size: 14px; text-decoration: none; margin-right: 16px; }
h1 { font-size: 32px; line-height: 1.25; margin: 18px 0 10px; }
h2 { font-size: 24px; margin: 56px 0 14px; padding-top: 8px; border-top: 1px solid var(--line); }
h3 { font-size: 18px; margin: 0 0 6px; }
p { margin: 8px 0; }
.sub { font-size: 18px; color: var(--fg2); margin: 0 0 14px; max-width: 1120px; }
.meta { color: var(--fg3); font-size: 14px; }
.muted { color: var(--fg2); }
.small { font-size: 14px; }
.mono { font: 13px/1.5 ui-monospace, "Cascadia Code", Consolas, monospace; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.box { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; }
.box ul { margin: 6px 0 0; padding-left: 20px; }
ul li { margin: 6px 0; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 13px; background: var(--card); border: 1px solid var(--line); border-radius: 6px; padding: 2px 9px; }
.chip b { color: var(--accent); }
footer { margin-top: 64px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--fg3); font-size: 13px; }

/* scene strip */
.strip { display: flex; gap: 10px; overflow-x: auto; padding: 14px 2px 10px; margin-top: 10px; scrollbar-width: thin; }
.strip button { flex: 0 0 auto; width: 150px; padding: 0; border: 2px solid var(--line); border-radius: 10px; background: var(--card);
  color: var(--fg); cursor: pointer; overflow: hidden; text-align: left; font: inherit; }
.strip button img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; background: #888; }
.strip button span { display: block; padding: 3px 8px 5px; font-size: 13px; line-height: 1.35; }
.strip button span em { display: block; font-style: normal; color: var(--fg3); font-size: 12px; }
.strip button.on { border-color: var(--accent); }
.strip button.extra span { color: var(--accent); }

/* panel */
.panel-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 14px; margin: 26px 0 12px; padding-top: 8px; border-top: 1px solid var(--line); }
.panel-head h2 { margin: 0; padding: 0; border: 0; }
.cols { display: grid; grid-template-columns: minmax(300px, 400px) minmax(0, 1fr); gap: 18px; align-items: start; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; margin-bottom: 14px; }
.card-h { font-weight: 600; margin-bottom: 8px; }
.card-h .small { font-weight: 400; }
.refimg { width: 100%; display: block; border-radius: 6px; border: 1px solid var(--line); aspect-ratio: 16 / 9; object-fit: cover; background: #888; }
video#vid { width: 100%; display: block; border-radius: 6px; background: #000; margin-top: 8px; aspect-ratio: 16 / 9; }
.toggle { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; margin-top: 6px; cursor: pointer; }
.toggle input { margin-top: 5px; }
#syncInfo { min-height: 1.5em; color: var(--fg3); margin: 4px 0 0; }
.dl { list-style: none; padding: 0; margin: 0; font-size: 14px; }
.dl li { margin: 4px 0; display: flex; justify-content: space-between; gap: 10px; }
.dl li span { color: var(--fg3); white-space: nowrap; }

/* segmented buttons */
.seg { display: inline-flex; flex-wrap: wrap; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--bg); }
.seg button, button.plain { font: inherit; font-size: 13px; padding: 4px 10px; border: 0; border-right: 1px solid var(--line); background: transparent;
  color: var(--fg); cursor: pointer; white-space: nowrap; }
.seg button:last-child { border-right: 0; }
.seg button:hover, button.plain:hover { background: var(--card); }
.seg button.on { background: var(--accent); color: #fff; }
.seg button:disabled { color: var(--fg3); cursor: default; background: transparent; }
button.plain { border: 1px solid var(--line); border-radius: 8px; background: var(--bg); }
#methodBar button { padding: 3px 8px; }
.variantbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
#variantNote { margin: 4px 0 8px; min-height: 1.4em; }
.toolbar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
.range { font-size: 13px; color: var(--fg2); display: inline-flex; align-items: center; gap: 6px; }
.range input { width: 110px; }

/* viewer */
.viewer { position: relative; width: 100%; aspect-ratio: 16 / 10; min-height: 360px; max-height: 78vh; background: var(--view);
  border: 1px solid var(--line); border-radius: 10px; overflow: hidden; touch-action: none; user-select: none; }
.viewer:fullscreen { max-height: none; border-radius: 0; }
.viewer canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; outline: none; }
.refover, .refside { position: absolute; pointer-events: none; object-fit: fill; }
.refside { border-left: 2px solid #fff; }
.crosshair { position: absolute; left: 50%; top: 50%; width: 14px; height: 14px; margin: -7px 0 0 -7px; pointer-events: none; }
.crosshair::before, .crosshair::after { content: ""; position: absolute; background: #fff; box-shadow: 0 0 2px #000; }
.crosshair::before { left: 6px; top: 0; width: 2px; height: 14px; }
.crosshair::after { top: 6px; left: 0; height: 2px; width: 14px; }
.loading { position: absolute; inset: 0; display: grid; place-content: center; justify-items: center; gap: 10px;
  background: color-mix(in srgb, var(--view) 82%, transparent); font-size: 14px; color: var(--fg2); }
.loading[hidden] { display: none; }
.lbar { width: 260px; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.lbar i { display: block; height: 100%; width: 0; background: var(--accent); transition: width .15s; }
.hint { position: absolute; left: 10px; bottom: 8px; right: 10px; font-size: 12px; color: #fff; text-shadow: 0 1px 2px rgba(0,0,0,.8);
  pointer-events: none; }
.info { position: absolute; right: 10px; top: 10px; width: min(300px, 60%); background: color-mix(in srgb, var(--bg) 92%, transparent);
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 12px; font-size: 13px; line-height: 1.55; }
.info b.t { display: block; font-size: 14px; word-break: break-all; margin-bottom: 2px; }
.info table { width: 100%; border-collapse: collapse; }
.info td { padding: 1px 0; vertical-align: top; }
.info td:first-child { color: var(--fg3); white-space: nowrap; padding-right: 10px; }
.info .x { position: absolute; right: 6px; top: 2px; border: 0; background: none; color: var(--fg3); cursor: pointer; font-size: 16px; }
.frameinfo { position: absolute; left: 10px; top: 10px; background: rgba(0,0,0,.55); color: #fff; padding: 2px 8px; border-radius: 6px; }
#status { min-height: 1.5em; margin: 6px 0; }
.joints .jrow { display: grid; grid-template-columns: minmax(140px, 1fr) auto minmax(100px, 200px); gap: 10px; align-items: center; font-size: 14px; margin: 4px 0; }

/* overview */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.ov { background: var(--card); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; display: flex; flex-direction: column; }
.ov img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; background: #888; }
.ov .b { padding: 10px 12px 12px; font-size: 13px; display: flex; flex-direction: column; gap: 6px; flex: 1; }
.ov .b h3 { font-size: 16px; margin: 0; }
.ov .b .row { color: var(--fg2); }
.ov .b .row a { margin-right: 8px; }
.ov .b button { align-self: flex-start; margin-top: auto; }

@media (max-width: 980px) {
  .cols { grid-template-columns: 1fr; }
  .two { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  h1 { font-size: 26px; }
  main { padding: 20px 14px 60px; }
  .viewer { aspect-ratio: 4 / 3; }
  .joints .jrow { grid-template-columns: 1fr; }
}