.ds-sim{
  --ds-brand:#4d4dd6;--ds-brand2:#6a6ae6;--ds-ice:#d6daf2;--ds-fg:#e8ecef;--ds-dim:#9aa6ad;
  --ds-mute:#69737c;--ds-green:#8a8af2;--ds-amber:#6a6ae6;--ds-cyan:#7e82c8;--ds-line:rgba(150,156,210,.14);
  position:relative;width:100%;max-width:1180px;margin:0 auto;
  background:#06071a;border:1px solid var(--ds-line);
  font-family:"Sora",system-ui,sans-serif;color:var(--ds-fg);overflow:hidden;
  box-shadow:0 40px 120px -50px rgba(70,76,200,.45);
}
.ds-frame{position:absolute;inset:0;pointer-events:none;z-index:5}
.ds-frame i{position:absolute;width:18px;height:18px;border:1.5px solid var(--ds-brand);opacity:.7}
.ds-frame i.a{top:12px;left:12px;border-right:0;border-bottom:0}
.ds-frame i.b{top:12px;right:12px;border-left:0;border-bottom:0}
.ds-frame i.c{bottom:12px;left:12px;border-right:0;border-top:0}
.ds-frame i.d{bottom:12px;right:12px;border-left:0;border-top:0}

.ds-top{position:absolute;top:0;left:0;right:0;z-index:4;display:flex;justify-content:space-between;
  align-items:center;gap:1rem;padding:.95rem 1.25rem;font-family:"JetBrains Mono",monospace;font-size:.64rem;
  letter-spacing:.16em;text-transform:uppercase;color:var(--ds-dim);
  background:linear-gradient(180deg,rgba(6,8,11,.9),transparent)}
.ds-top .hl{color:var(--ds-brand2)}
.ds-top .live{display:inline-flex;align-items:center;gap:.45rem;color:var(--ds-green)}
.ds-top .live i{width:7px;height:7px;border-radius:50%;background:var(--ds-green);box-shadow:0 0 8px var(--ds-green);
  animation:ds-pulse 1.6s infinite}
@keyframes ds-pulse{0%,100%{opacity:1}50%{opacity:.25}}

.ds-stage{position:relative;width:100%;aspect-ratio:16/9;min-height:340px;max-height:74vh}
.ds-canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.ds-vig{position:absolute;inset:0;pointer-events:none;z-index:2;
  background:radial-gradient(120% 100% at 50% 45%,transparent 50%,rgba(3,4,7,.78) 100%)}

/* narration */
.ds-narr{position:absolute;left:1.25rem;bottom:1.25rem;z-index:4;max-width:min(60%,460px)}
.ds-narr .tag{font-family:"JetBrains Mono",monospace;font-size:.66rem;letter-spacing:.24em;text-transform:uppercase;
  color:var(--ds-brand);margin-bottom:.55rem}
.ds-narr .ttl{font-family:"Chakra Petch",sans-serif;font-weight:700;text-transform:uppercase;
  font-size:clamp(1.35rem,3.2vw,2.3rem);line-height:1.02}
.ds-narr .desc{margin-top:.55rem;color:var(--ds-dim);font-weight:300;font-size:.95rem;line-height:1.5}
.ds-narr .chips{margin-top:.9rem;display:flex;flex-wrap:wrap;gap:.45rem}
.ds-narr .chip{font-family:"JetBrains Mono",monospace;font-size:.6rem;letter-spacing:.06em;text-transform:uppercase;
  padding:.3rem .55rem;border:1px solid rgba(150,156,210,.22);color:var(--ds-brand2);background:rgba(8,11,17,.55)}
.ds-narr .chip.ok{color:var(--ds-green);border-color:rgba(95,208,138,.4)}
.ds-narr .chip.warn{color:var(--ds-amber);border-color:rgba(245,166,35,.4)}
.ds-swap{transition:opacity .3s ease,transform .3s cubic-bezier(.2,.7,.2,1)}
.ds-swap.out{opacity:0;transform:translateY(7px)}

/* controls */
.ds-ctl{position:relative;z-index:4;display:flex;align-items:center;gap:.9rem;padding:.7rem 1.1rem;
  border-top:1px solid var(--ds-line);background:rgba(6,8,11,.6)}
.ds-btn{flex:none;width:34px;height:34px;border:1px solid rgba(150,156,210,.22);background:rgba(12,16,22,.6);
  color:var(--ds-ice);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:border-color .2s,color .2s}
.ds-btn:hover{border-color:var(--ds-brand);color:#fff}
.ds-btn svg{width:14px;height:14px}
.ds-bar{flex:1;height:3px;background:rgba(150,156,210,.16);cursor:pointer;position:relative}
.ds-fill{position:absolute;left:0;top:0;bottom:0;width:0%;background:var(--ds-brand);box-shadow:0 0 10px var(--ds-brand)}
.ds-fill::after{content:"";position:absolute;right:-3px;top:50%;transform:translateY(-50%);width:7px;height:7px;
  border-radius:50%;background:var(--ds-ice);box-shadow:0 0 8px var(--ds-brand)}
.ds-tabs{display:flex;gap:.2rem;flex:none}
.ds-tabs button{background:none;border:0;cursor:pointer;padding:.4rem .55rem;font-family:"JetBrains Mono",monospace;
  font-size:.6rem;letter-spacing:.1em;text-transform:uppercase;color:var(--ds-mute);transition:color .2s;position:relative}
.ds-tabs button:hover{color:var(--ds-dim)}
.ds-tabs button.on{color:var(--ds-ice)}
.ds-tabs button.on::after{content:"";position:absolute;left:.55rem;right:.55rem;bottom:.15rem;height:2px;background:var(--ds-brand)}
.ds-tabs button.done{color:var(--ds-green)}

@media(max-width:720px){
  .ds-stage{aspect-ratio:1/1;min-height:340px;max-height:66vh}
  .ds-narr{left:1rem;right:1rem;bottom:1rem;max-width:none}
  .ds-narr .desc{display:none}
  .ds-ctl{flex-wrap:wrap;gap:.6rem;padding:.7rem .85rem}
  .ds-bar{order:3;flex-basis:100%}
  .ds-tabs{flex-basis:100%;justify-content:space-between}
  .ds-tabs button{padding:.35rem .15rem;font-size:.5rem;letter-spacing:.02em}
}
@media(prefers-reduced-motion:reduce){
  .ds-top .live i{animation:none}
}