: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);
    --ok:var(--green-300); --warn:var(--orange-300);
  }
  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}

  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}
  .note{font-size:11px;color:var(--text-3);margin-top:10px}

  .card{
    background:var(--panel);border-radius:12px;
    box-shadow:inset 0 0 0 1px var(--line);
    padding:18px;
  }
  .card h4{font-size:12px;font-weight:550;display:flex;justify-content:space-between;align-items:baseline}
  .card h4 span{font-size:11px;font-weight:500;color:var(--text-3)}


  /* ================= B · LIVING BOARD ================= */
  .board{display:grid;grid-template-columns:repeat(7,1fr);gap:10px;margin-top:36px}
  .b-col{
    background:var(--panel);border-radius:12px;
    box-shadow:inset 0 0 0 1px var(--line);
    padding:10px;min-height:210px;
    display:flex;flex-direction:column;gap:8px;
    transition:box-shadow .2s;
  }
  .b-col.over{box-shadow:inset 0 0 0 1.5px var(--brand)}
  .b-col h5{font-size:11px;font-weight:550;color:var(--text-3);text-transform:none;letter-spacing:.4px;display:flex;justify-content:space-between}
  .b-col h5 .tab{color:var(--text-2)}
  .b-load{height:3px;border-radius:2px;background:var(--bg-2);overflow:hidden}
  .b-load i{display:block;height:100%;border-radius:2px;background:var(--text-2);transition:width .35s var(--ease-out), background .3s}
  .b-col.heavy .b-load i{background:var(--warn)}
  .chip{
    padding:9px 10px;border-radius:8px;
    background:var(--bg-2);box-shadow:inset 0 0 0 1px var(--line);
    font-size:12px;font-weight:550;
    cursor:grab;user-select:none;-webkit-user-select:none;
    touch-action:none;
    transition:box-shadow .15s;
  }
  .chip small{display:block;font-weight:500;color:var(--text-3);font-size:11px;margin-top:1px}
  .chip.hard{box-shadow:inset 0 0 0 1px var(--line), inset 3px 0 0 var(--brand)}
  .chip.drag{position:fixed;z-index:400;pointer-events:none;box-shadow:var(--shadow-float);transform:rotate(2.5deg) scale(1.04);opacity:.95}
  .b-note{
    margin-top:16px;font-size:12px;color:var(--text-2);
    display:flex;align-items:center;gap:8px;
    min-height:20px;
    opacity:0;transform:translateY(4px);
    transition:opacity .25s var(--ease-exit), transform .3s var(--ease-out);
  }
  .b-note.on{opacity:1;transform:none}
  .b-note i{width:7px;height:7px;border-radius:9999px;background:var(--warn);flex:none}

  @media (max-width:900px){
    #a-grid{grid-template-columns:1fr}
    .board{grid-template-columns:repeat(2,1fr)}
    #e-grid{grid-template-columns:1fr;gap:26px}
  }
  @media (prefers-reduced-motion: reduce){
    *{transition-duration:.01ms !important;animation-duration:.01ms !important}
  }

section{min-height:100vh}