:root{
    --bg:var(--gray-0); --bg-2:var(--gray-20); --panel:var(--gray-0);
    --text:var(--gray-750); --text-2:var(--gray-500); --text-3:var(--gray-300);
    --brand:var(--violet-400);
    --line:color-mix(in srgb, var(--gray-900) 8%, transparent); --line-strong:color-mix(in srgb, var(--gray-900) 13%, transparent);
    --hover:color-mix(in srgb, var(--gray-750) 4.5%, transparent);
    --shadow-float:0 0 0 1px color-mix(in srgb, var(--gray-900) 5%, transparent), 0 2px 6px color-mix(in srgb, var(--gray-900) 5%, transparent), 0 12px 32px color-mix(in srgb, var(--gray-900) 10%, transparent);
    --ease-exit:cubic-bezier(.215,.61,.355,1);
    --ease-out:cubic-bezier(.16,1,.3,1);
    --ease-spring:cubic-bezier(.34,1.26,.64,1);
    --ok:var(--green-300); --warn:var(--orange-300);
    --bp-bg:var(--gray-870); --bp-line:var(--violet-700); --bp-text:var(--violet-250);
  }
  html[data-theme="dark"]{
    --bg:var(--gray-900); --bg-2:var(--gray-880); --panel:var(--gray-870);
    --text:var(--gray-20); --text-2:var(--gray-350); --text-3:var(--gray-550);
    --brand:var(--violet-450);
    --line:color-mix(in srgb, var(--gray-0) 8%, transparent); --line-strong:color-mix(in srgb, var(--gray-0) 15%, transparent);
    --hover:color-mix(in srgb, var(--gray-0) 5.5%, transparent);
    --shadow-float:0 0 0 1px color-mix(in srgb, var(--gray-0) 8%, transparent), 0 2px 6px color-mix(in srgb, var(--gray-900) 40%, transparent), 0 12px 32px color-mix(in srgb, var(--gray-900) 55%, transparent);
  }
  *{margin:0;padding:0;box-sizing:border-box}
  html{color-scheme:light dark}
  body{
    font-family:var(--font);
    font-feature-settings:"cv01","ss03";
    background:var(--bg); color:var(--text);
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  button{font:inherit;color:inherit;background:none;border:0;cursor:default}
  ::selection{background:color-mix(in srgb, var(--brand) 25%, transparent)}
  .tab{font-variant-numeric:tabular-nums}
  .mono{font-family:var(--font-mono)}

  section{position:relative;padding:120px 24px}
  .wrap{max-width:1080px;margin:0 auto}
  .tag{position:absolute;top:26px;left:28px;font-size:11px;font-weight:550;letter-spacing:.5px;color:var(--text-3);text-transform:none}
  .kick{font-size:12px;font-weight:550;letter-spacing:.4px;text-transform:none;color:var(--text-3);margin-bottom:16px}
  h2{font-size:clamp(32px,3.8vw,48px);font-weight:500;letter-spacing:-0.02em;line-height:1.08;max-width:20ch;text-wrap:balance}
  .sub{margin-top:14px;font-size:15px;line-height:1.55;color:var(--text-2);max-width:56ch;text-wrap:pretty}


  .pu-head{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:16px}
  .pu-head b{font-size:15px;font-weight:550}
  .pu-head span{font-size:11px;color:var(--text-3)}
  .pu-row{
    display:grid;grid-template-columns:52px 1fr 90px 60px;gap:14px;align-items:center;
    padding:11px 12px;border-radius:8px;margin:0 -12px;
  }
  .pu-row:is(:hover, [data-hover]){background:var(--hover)}
  .pu-d{font-size:11px;color:var(--text-3);font-weight:550}
  .pu-n{font-size:13px;font-weight:550}
  .pu-n small{display:block;font-weight:450;color:var(--text-2);font-size:11px;margin-top:1px}
  .pu-bar{height:4px;border-radius:2px;background:var(--bg-2);overflow:hidden}
  .pu-bar i{display:block;height:100%;background:var(--brand);border-radius:2px}
  .pu-w{font-size:12px;color:var(--text-2);text-align:right}
  /* ================= F · EXPLODED ================= */
  #ff{background:var(--bg-2)}
  #ex-stage{
    margin-top:10px;height:460px;position:relative;
    perspective:1400px;
    display:grid;place-items:center;
  }
  #ex-pivot{
    position:relative;width:min(560px,80vw);height:320px;
    transform-style:preserve-3d;
    transform:rotateX(56deg) rotateZ(-34deg);
  }
  .ex-layer{
    position:absolute;inset:0;border-radius:12px;
    transform:translateZ(calc(var(--z) * var(--gap,0) * 1px));
    transition:transform .6s var(--ease-out), box-shadow .4s;
    background:var(--panel);
    box-shadow:0 0 0 1px var(--line), 0 30px 60px color-mix(in srgb, var(--gray-900) 10%, transparent);
    padding:16px;overflow:hidden;
  }
  .ex-lab{
    position:absolute;left:calc(100% + 26px);top:50%;
    transform:rotateZ(34deg) rotateX(-56deg);
    transform-origin:left center;
    font-size:11px;font-weight:550;letter-spacing:.4px;text-transform:none;
    color:var(--text-3);white-space:nowrap;
    opacity:0;transition:opacity .35s var(--ease-exit) .15s;
  }
  #ex-stage.open .ex-lab{opacity:1}
  .ex-lab::before{content:'';position:absolute;right:100%;top:50%;width:20px;height:1px;background:var(--text-3);margin-right:5px}
  /* layer contents */
  .exl-data{font-family:var(--font-mono);font-size:9px;line-height:1.9;color:var(--text-3);columns:3;column-gap:14px}
  .exl-model svg{width:100%;height:100%}
  .exl-plan .pu-row{grid-template-columns:44px 1fr 70px;padding:8px 10px}
  #ex-ctl{display:flex;align-items:center;gap:14px;justify-content:center;margin-top:8px}
  #ex-ctl span{font-size:11px;color:var(--text-3)}
  #exRange{-webkit-appearance:none;width:220px;height:3px;border-radius:2px;background:var(--line-strong);outline:none}
  #exRange::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:9999px;background:var(--text);cursor:default}

  @media (max-width:900px){
    #c-grid{grid-template-columns:1fr}
  }
  @media (prefers-reduced-motion: reduce){
    *{transition-duration:.01ms !important;animation-duration:.01ms !important}
  }

section{min-height:100vh}