:root{font-family:"Microsoft YaHei","Segoe UI",sans-serif;color:#283237;background:#f4f6f8;font-synthesis:none;font-size:14px;--safe-top:env(safe-area-inset-top,0px);--safe-right:env(safe-area-inset-right,0px);--safe-bottom:env(safe-area-inset-bottom,0px);--safe-left:env(safe-area-inset-left,0px)}
*{box-sizing:border-box}
html,body{width:100%;height:100%;margin:0;overflow:hidden;overscroll-behavior:none}
#app{width:100%;height:100%;height:100dvh;position:relative;overflow:hidden}
#viewport{position:absolute;inset:0}
canvas{display:block;width:100%;height:100%;touch-action:none;outline:none}
.heading{position:absolute;left:max(32px,var(--safe-left));top:calc(26px + var(--safe-top));pointer-events:none}
.heading h1{font-size:23px;font-weight:600;letter-spacing:.055em;margin:0 0 8px}
.heading p{font-size:12px;letter-spacing:.1em;color:#7b858b;margin:0}
.status{position:absolute;left:max(32px,var(--safe-left));top:calc(108px + var(--safe-top));font-size:13px;display:flex;align-items:center;gap:8px;color:#596970;pointer-events:none}
.status-dot{width:6px;height:6px;border-radius:50%;background:#7f909b;flex:none}
.status[data-phase="capture"] .status-dot{background:#2b736d}
.status[data-phase="capture"]{color:#2b736d}
.view-controls,.transport-controls{display:flex;align-items:center;gap:3px;padding:6px;background:rgba(255,255,255,.94);border:1px solid rgba(71,89,102,.12);border-radius:11px;box-shadow:0 3px 18px rgba(26,40,52,.04)}
.view-controls{position:absolute;right:max(28px,var(--safe-right));top:calc(28px + var(--safe-top))}
.separator{height:20px;width:1px;background:#e0e5e8;margin:0 5px;flex:none}
button,select{font:inherit;color:inherit;border:0;border-radius:6px;background:transparent;min-width:44px;min-height:44px;padding:0 12px;cursor:pointer;white-space:nowrap;transition:background .15s;touch-action:manipulation;-webkit-tap-highlight-color:transparent}
@media(hover:hover){button:hover,select:hover{background:#f0f3f5}.primary:hover{background:#243f4d}}
button[aria-pressed="true"]{background:#e9eff2;color:#22475a}
button:focus-visible,select:focus-visible{outline:2px solid #57829b;outline-offset:2px}
button:disabled{cursor:wait;opacity:.48}
.primary{background:#304e5e;color:white;min-width:92px}
.speed-label{font-size:12px;color:#829097;margin-left:5px}
select{padding:0 8px}
.bottom{position:absolute;bottom:calc(25px + var(--safe-bottom));left:50%;transform:translateX(-50%);display:flex;align-items:center;flex-direction:column;gap:9px;max-width:calc(100% - var(--safe-left) - var(--safe-right) - 16px)}
.hint{font-size:11px;color:#74828a;margin:0;white-space:nowrap;pointer-events:none}
.touch-hint{display:none}
.loading{position:absolute;inset:0;display:flex;justify-content:center;align-items:center;gap:12px;background:rgba(244,246,248,.92);color:#74828a;font-size:14px}
.loading[hidden],.error[hidden],.display-notice[hidden]{display:none}
.spinner{width:20px;height:20px;border:2px solid #d8e0e4;border-top-color:#57717e;border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.error{position:absolute;top:40%;left:50%;transform:translate(-50%,-50%);width:min(600px,90vw);max-height:70%;overflow:auto;background:white;border:1px solid #d8dfe4;border-radius:12px;padding:22px;line-height:1.8;white-space:pre-line;overflow-wrap:anywhere;z-index:4}
.display-notice{position:absolute;top:calc(92px + var(--safe-top));left:50%;transform:translateX(-50%);width:min(540px,calc(100% - 32px));padding:10px 14px;border:1px solid #d8dfe4;border-radius:9px;background:rgba(255,255,255,.96);font-size:12px;line-height:1.7;z-index:3;pointer-events:none}
/* The fallback fills the dynamic viewport; browser chrome remains browser-controlled. */
.immersive #app{position:fixed;inset:0;z-index:20;height:100%;height:100dvh;background:#f4f6f8}
.immersive .heading,.immersive .hint{display:none}
.immersive .status{top:calc(30px + var(--safe-top))}
.immersive .view-controls{top:calc(16px + var(--safe-top))}
.immersive .bottom{bottom:calc(12px + var(--safe-bottom))}
@media(pointer:coarse){.mouse-hint{display:none}.touch-hint{display:inline}}
@media(max-width:760px){
  .heading{left:calc(16px + var(--safe-left));top:calc(15px + var(--safe-top))}
  .heading h1{font-size:18px;margin-bottom:0}
  .heading p{display:none}
  .status{left:calc(16px + var(--safe-left));top:calc(46px + var(--safe-top));font-size:12px}
  .view-controls{left:calc(8px + var(--safe-left));right:calc(8px + var(--safe-right));top:calc(76px + var(--safe-top));display:grid;grid-template-columns:repeat(5,minmax(44px,1fr)) minmax(64px,1.35fr);gap:2px;padding:3px}
  .desktop-label,.separator,.speed-label{display:none}
  button,select{padding:0 5px;font-size:12px}
  #viewport{top:calc(135px + var(--safe-top));bottom:calc(132px + var(--safe-bottom));left:var(--safe-left);right:var(--safe-right)}
  .bottom{left:calc(8px + var(--safe-left));right:calc(8px + var(--safe-right));bottom:calc(10px + var(--safe-bottom));transform:none;max-width:none;gap:7px}
  .transport-controls{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));width:100%;gap:3px;padding:4px}
  .transport-controls #play,.transport-controls #restart,.transport-controls #speed{grid-column:span 2}
  .transport-controls #loop,.transport-controls #auto-rotate{grid-column:span 3}
  .primary{min-width:44px}
  .hint{font-size:11px}
  .display-notice{top:calc(130px + var(--safe-top))}
  .immersive .status{top:calc(13px + var(--safe-top))}
  .immersive .view-controls{top:calc(40px + var(--safe-top))}
  .immersive #viewport{top:calc(99px + var(--safe-top));bottom:calc(115px + var(--safe-bottom))}
  .immersive .display-notice{top:calc(100px + var(--safe-top))}
}
@media(max-height:520px) and (min-width:480px){
  .heading{display:none}
  .status,.immersive .status{left:calc(12px + var(--safe-left));top:calc(25px + var(--safe-top));font-size:11px;max-width:160px}
  .view-controls,.immersive .view-controls{left:auto;right:calc(8px + var(--safe-right));top:calc(7px + var(--safe-top));display:flex;gap:2px;padding:3px;transform:none}
  .view-controls button{padding:0 9px;font-size:12px}
  .desktop-label,.separator,.speed-label,.hint{display:none}
  #viewport,.immersive #viewport{top:calc(65px + var(--safe-top));bottom:calc(66px + var(--safe-bottom));left:var(--safe-left);right:var(--safe-right)}
  .bottom,.immersive .bottom{left:50%;right:auto;transform:translateX(-50%);bottom:calc(7px + var(--safe-bottom));width:auto;max-width:calc(100% - 16px - var(--safe-left) - var(--safe-right))}
  .transport-controls{display:flex;width:auto;gap:3px;padding:3px}
  .transport-controls button,.transport-controls select{padding:0 12px;font-size:12px}
  .display-notice,.immersive .display-notice{top:calc(66px + var(--safe-top))}
}
.presentation .heading,.presentation .view-controls,.presentation .bottom,.presentation .status,.presentation .display-notice{display:none}
.presentation #viewport{inset:0}
@media(prefers-reduced-motion:reduce){button,select{transition:none}.spinner{animation-duration:2s}}