:root{
  --bg:#ffffff;--ink:#0b0b0d;--ink2:#3a3a40;--mut:#6b6b72;--mut2:#8a8a91;
  --line:#e9e9ec;--line2:#dcdce0;--tile:#111114;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --user:#3567c9;--assistant:#b8541a;--accent:#367c3c;
  --user-s:#eaf0fb;--assistant-s:#fdefe4;--accent-s:#eaf6ec;
  --navH:51px;--filterH:53px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Inter","Segoe UI","PingFang SC",system-ui,sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
button{font:inherit}.wrap{max-width:1220px;margin:0 auto;padding:0 30px}
.nav{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.85);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border-bottom:1px solid var(--line);display:flex;align-items:center;gap:16px;padding:14px 30px}
.brand{font-weight:700;font-size:14px;letter-spacing:.02em;display:flex;align-items:center;gap:9px}
.brand .sq{width:18px;height:18px;background:var(--ink);border-radius:4px;display:inline-block;flex-shrink:0}
.brand small{font-weight:500;color:var(--mut);font-size:11.5px}
.filter{position:sticky;top:var(--navH);z-index:50;background:rgba(255,255,255,.88);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 0;border-bottom:1px solid var(--line)}
#scene-nav{display:contents}
.fl-lab{font-family:var(--mono);font-size:10.5px;color:var(--mut2);text-transform:uppercase;letter-spacing:.06em;margin-right:4px}
.nav-chip{font-size:12px;font-weight:600;color:var(--ink2);border:1px solid var(--line2);background:#fff;border-radius:20px;padding:5px 14px;cursor:pointer;transition:.12s;white-space:nowrap;line-height:1.4}
.nav-chip:hover{border-color:#b7b7bd;color:var(--ink)}
.nav-chip.on{background:var(--ink);color:#fff;border-color:var(--ink)}
.master-progress:focus-visible,.nav-chip:focus-visible{outline:2px solid var(--ink);outline-offset:2px}
.legend{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 0 0}
#role-legend{display:contents}
.role-key{display:flex;align-items:center;gap:5px;font-family:var(--mono);font-size:10.5px;color:#55555c}
.role-key i,.cdot,.ldot{width:9px;height:9px;border-radius:50%;display:inline-block;flex-shrink:0}
.bg-user{background:var(--user)}.bg-assistant{background:var(--assistant)}
.load-state{font-family:var(--mono);font-size:12px;color:var(--mut);padding:36px 0}
.load-state.error{color:#a12c2c;background:#fff3f3;border:1px solid #f0caca;border-radius:10px;padding:14px 16px;margin-top:22px}
#scenes{padding-top:22px}
.scene-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:0 1px 3px rgba(10,10,14,.04),0 6px 24px rgba(10,10,14,.05);margin-bottom:26px;scroll-margin-top:calc(var(--navH) + var(--filterH) + 14px)}
.card-hdr{padding:14px 22px 12px;display:flex;align-items:center;gap:10px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.scene-badge{font-family:var(--mono);font-size:11px;font-weight:700;padding:2px 9px;border-radius:6px;background:var(--user-s);color:var(--user);letter-spacing:.04em}
.scene-name{font-size:14px;font-weight:700}.scene-sess{font-family:var(--mono);font-size:11px;color:var(--mut)}
.ready{margin-left:auto;font-family:var(--mono);font-size:9.5px;font-weight:700;color:var(--accent);background:var(--accent-s);padding:2px 8px;border-radius:5px;letter-spacing:.03em}
.videos-row{display:flex;gap:12px;flex-wrap:wrap;padding:18px 22px 8px;background:#0c0f16}
.vid-cell{flex:1 1 300px;min-width:240px;max-width:560px;position:relative}
.vid-cap{display:flex;align-items:center;gap:6px;font-size:11px;font-weight:650;color:#dfe3ea;padding:0 2px 5px;font-family:var(--mono)}
.p-video{width:100%;display:block;border-radius:9px;background:#000;aspect-ratio:16/9;object-fit:contain}
.master-bar{display:flex;align-items:center;gap:12px;padding:13px 22px;background:#fafafa;border-bottom:1px solid var(--line)}
.master-bar button{border:1px solid transparent;padding:6px 15px;border-radius:8px;font-size:12px;font-weight:600;cursor:pointer;transition:.12s}
.play-btn{background:var(--user);color:#fff;border-color:var(--user)}.play-btn:hover{opacity:.88}.play-btn:disabled{opacity:.4;cursor:not-allowed}
.restart-btn{background:#fff!important;border-color:var(--line2)!important;color:var(--ink)}.restart-btn:hover{background:#f3f3f4!important}
.master-tc{font-family:var(--mono);font-size:12px;font-variant-numeric:tabular-nums;color:var(--mut);min-width:128px}
.master-progress{position:relative;flex:1;height:12px;background:#e6e6ea;border-radius:7px;cursor:pointer;overflow:visible}
.mp-fill{position:absolute;left:0;top:0;bottom:0;width:0;background:linear-gradient(90deg,var(--user),#6fa0e0);border-radius:7px}
.mp-head{position:absolute;top:-3px;bottom:-3px;width:3px;left:0;background:var(--ink);border-radius:2px;pointer-events:none}
.tracks{padding:10px 22px 18px}
.lane{display:grid;grid-template-columns:160px 1fr;gap:0 14px;align-items:center;padding:46px 0 8px}
.lane-label{display:flex;align-items:center;gap:7px;font-size:12px;font-weight:650;align-self:flex-end;padding-bottom:2px;font-family:var(--mono);min-width:0}
.lane-tag{font-size:9px;color:var(--mut);background:#f0f0f2;padding:1px 5px;border-radius:3px;font-weight:600;border:1px solid var(--line)}
.track-wrap{position:relative;height:22px;cursor:pointer}
.track-bg{position:absolute;inset:0;background:#eeeef1;border-radius:5px;overflow:hidden}
.seg-block{position:absolute;top:0;bottom:0;border-radius:2px;opacity:.72;min-width:1px}
.seg-block.user{background:var(--user)}.seg-block.assistant{background:var(--assistant)}
.playhead{position:absolute;top:-4px;bottom:-4px;width:2px;left:0;background:var(--ink);border-radius:1px;pointer-events:none;will-change:left;z-index:3}
.ph-cap{position:absolute;bottom:100%;left:0;transform:translate3d(0,0,0);margin-bottom:10px;will-change:transform;padding:5px 11px;border-radius:9px;font-size:13.5px;line-height:1.45;color:#fff;text-align:left;white-space:normal;width:max-content;max-width:440px;box-shadow:0 6px 22px rgba(10,10,14,.22);display:none;pointer-events:none;z-index:6;font-weight:500}
.ph-cap::after{content:'';position:absolute;top:100%;left:var(--ax,50%);transform:translateX(-50%);border:6px solid transparent;border-top-color:inherit}
.ph-cap.user{background:var(--user);border-top-color:var(--user)}.ph-cap.assistant{background:var(--assistant);border-top-color:var(--assistant)}
footer{margin:56px 0 0;padding:26px 0 70px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--mut)}
@media(max-width:640px){
  .wrap{padding:0 16px}.nav{padding:12px 16px}.brand small{display:none}.filter{position:static}
  .videos-row{flex-direction:column}.vid-cell{max-width:none;min-width:0;flex:0 0 auto}
  .lane{grid-template-columns:74px 1fr;gap:0 10px}.lane-label{font-size:10px}.lane-tag{display:none}
  .master-bar{flex-wrap:wrap;gap:10px 12px}.master-progress{flex-basis:100%;order:4;height:16px}
  .master-tc{min-width:100px;font-size:11px;margin-left:auto}.track-wrap{height:30px}.ph-cap{max-width:78vw;font-size:12.5px}.ready{margin-left:0}
}