:root{
  --bg:#F9F4EE;--surface:#FFFFFF;--surface-sunken:#F1E8DE;--line:#E4D6C8;--line-strong:#C9B8A6;
  --ink:#2A1E15;--ink-2:#54463A;--ink-3:#6B5C4E;
  --accent:#A8501A;--accent-hover:#8A3F12;--accent-soft:#F7E4D3;--accent-weak:#DDB08C;--on-accent:#FFFFFF;
  --pop:0 8px 24px rgb(0 0 0 / .08);
  --font:"Inter","Noto Sans JP",system-ui,-apple-system,"Hiragino Sans","Yu Gothic UI",sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#1C1611;--surface:#241C16;--surface-sunken:#2C231B;--line:#362C23;--line-strong:#4A3C30;
    --ink:#F0E6DC;--ink-2:#C2B4A6;--ink-3:#9C8E80;
    --accent:#EDAA7A;--accent-hover:#F3BE96;--accent-soft:#3B2A1D;--accent-weak:#80593A;--on-accent:#1C1611;
    --pop:0 8px 24px rgb(0 0 0 / .35);color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#1C1611;--surface:#241C16;--surface-sunken:#2C231B;--line:#362C23;--line-strong:#4A3C30;
  --ink:#F0E6DC;--ink-2:#C2B4A6;--ink-3:#9C8E80;
  --accent:#EDAA7A;--accent-hover:#F3BE96;--accent-soft:#3B2A1D;--accent-weak:#80593A;--on-accent:#1C1611;
  --pop:0 8px 24px rgb(0 0 0 / .35);color-scheme:dark;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;background:var(--bg);color:var(--ink);font:400 15px/1.7 var(--font);-webkit-font-smoothing:antialiased;display:flex;flex-direction:column}
button,input,select{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ic{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.ic.big{width:34px;height:34px;stroke-width:1.5;color:var(--accent)}

/* header */
.hdr,.privacy,main{width:100%;max-width:1480px;margin-left:auto;margin-right:auto}
.hdr{display:flex;justify-content:space-between;align-items:center;padding:18px 28px 6px}
.logo{display:inline-flex;align-items:center;gap:.42em;font:500 19px/1 Inter,sans-serif;letter-spacing:.06em;color:var(--ink);text-decoration:none}
.logo svg{width:1.2em;height:1.2em;flex-shrink:0}
.icon-btn{width:36px;height:36px;border-radius:8px;border:1px solid var(--line);background:var(--surface);cursor:pointer;display:inline-grid;place-items:center;color:var(--ink-2);transition:border-color .15s var(--ease),color .15s var(--ease)}
.icon-btn:hover{border-color:var(--line-strong);color:var(--ink)}
.privacy{display:flex;gap:6px;align-items:center;font-size:12px;color:var(--ink-3);padding:0 28px 12px;margin:0 auto}
.privacy .ic{width:14px;height:14px}
.privacy .short{display:none}

main{flex:1;padding:0 28px;display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:18px;align-items:start}

/* stage */
.stage{min-width:0}
.stagebar{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;padding:0 0 10px}
.hist{display:flex;gap:4px}
.tb{min-width:34px;height:32px;padding:0 12px 0 9px;border:1px solid var(--accent-weak);border-radius:8px;background:var(--accent-soft);color:var(--accent);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:5px;font-size:13px;font-weight:600;line-height:1;transition:background .12s var(--ease),color .12s var(--ease)}
.tb:hover:not(:disabled){background:var(--accent);color:var(--on-accent)}
.tb:disabled{opacity:.5;cursor:default;background:transparent;border-color:var(--line-strong);color:var(--ink-3)}
.seg{display:inline-flex;border:1px solid var(--line-strong);border-radius:8px;overflow:hidden;background:var(--surface)}
.seg button{height:30px;padding:0 12px;border:0;background:transparent;color:var(--ink-2);cursor:pointer;font-size:13px;white-space:nowrap}
.seg button+button{border-left:1px solid var(--line)}
.seg button:hover{color:var(--ink)}
.seg button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
.hover{margin-left:auto;display:inline-flex;align-items:center;gap:6px;font-size:12px;color:var(--ink-3);font-variant-numeric:tabular-nums;min-height:20px}
.hover i{width:16px;height:16px;border-radius:4px;border:1px solid var(--line-strong);display:none}
.viewport{position:relative;height:calc(100dvh - 250px);min-height:340px;border:1px solid var(--line);border-radius:12px;background:var(--surface-sunken);overflow:auto;display:flex}
.viewport[data-fit="fit"]{overflow:hidden}
.cv-wrap{margin:auto;line-height:0;flex-shrink:0;border-radius:2px;box-shadow:0 0 0 1px var(--line-strong)}
.cv-wrap canvas{display:block;cursor:crosshair}
.viewport[data-bg="checker"] .cv-wrap{background-color:#fff;background-image:conic-gradient(#cfcfcf 25%,#fff 0 50%,#cfcfcf 0 75%,#fff 0);background-size:16px 16px}
.viewport[data-bg="white"] .cv-wrap{background:#fff}
.viewport[data-bg="black"] .cv-wrap{background:#000}
.empty{margin:auto;width:min(520px,calc(100% - 32px));padding:44px 24px;border:2px dashed var(--accent-weak);border-radius:14px;background:transparent;display:flex;flex-direction:column;align-items:center;gap:8px;text-align:center;cursor:pointer;color:var(--ink-2);line-height:1.6}
.empty b{font-size:15px;color:var(--ink);font-weight:600}
.empty span{font-size:12.5px;color:var(--ink-3)}
.empty:hover,.viewport.dragover .empty{border-color:var(--accent);background:var(--accent-soft)}
.viewport.dragover{outline:2px solid var(--accent);outline-offset:-2px}
.hint{margin:10px 2px 0;font-size:12.5px;color:var(--ink-3)}

/* panel */
.panel{display:flex;flex-direction:column;gap:12px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 16px;display:flex;flex-direction:column;gap:10px}
.card-head{display:flex;justify-content:space-between;align-items:center;gap:8px;min-height:28px}
.card h2{margin:0;font-size:14px;font-weight:600}
.card h2 label{cursor:default}
.meta{margin:0;font-size:12.5px;color:var(--ink-3);line-height:1.6}
.btn{height:34px;padding:0 14px;border-radius:8px;border:1px solid var(--line-strong);background:transparent;font-size:13px;font-weight:500;cursor:pointer;color:var(--ink);white-space:nowrap;display:inline-flex;align-items:center;justify-content:center;gap:6px;transition:background .15s var(--ease),border-color .15s var(--ease),color .15s var(--ease)}
.btn:hover:not(:disabled){border-color:var(--ink-3)}
.btn:disabled{opacity:.45;cursor:default}
.btn-wide{width:100%}
.btn-primary{background:var(--accent);border-color:var(--accent);color:var(--on-accent);height:38px;font-size:14px}
.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover)}
.btn-text{border-color:transparent;color:var(--ink-2);font-weight:400;padding:0 6px;height:28px;font-size:12.5px}
.btn-text:hover:not(:disabled){border-color:transparent;color:var(--ink)}
.picker{position:relative;overflow:hidden}
.picker input{position:absolute;inset:0;opacity:0;cursor:pointer;width:100%;height:100%;border:0;padding:0}
.chips{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}
.chips:empty{display:none}
.chip{display:flex;align-items:center;gap:10px;padding:5px 6px 5px 8px;border:1px solid var(--line);border-radius:8px;background:var(--bg);font-size:13px;font-variant-numeric:tabular-nums}
.chip i{width:22px;height:22px;border-radius:5px;border:1px solid var(--line-strong);flex-shrink:0}
.chip span{flex:1;letter-spacing:.04em}
.chip button{width:26px;height:26px;border-radius:6px;border:0;background:transparent;color:var(--ink-3);cursor:pointer;display:grid;place-items:center}
.chip button:hover{background:var(--accent-soft);color:var(--accent)}
.chip .ic{width:14px;height:14px}
output{font:500 14px/1 Inter,sans-serif;color:var(--accent);font-variant-numeric:tabular-nums}
input[type="range"]{width:100%;accent-color:var(--accent);margin:2px 0}
.chk{display:flex;align-items:center;gap:8px;font-size:13.5px;cursor:pointer;color:var(--ink-2)}
.chk input{accent-color:var(--accent);width:16px;height:16px;margin:0}

/* tsuzura footer */
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom));transform:translateX(-50%);background:var(--ink);color:var(--bg);padding:8px 18px;border-radius:999px;font-size:13px;box-shadow:var(--pop);z-index:50;max-width:calc(100vw - 32px)}

@media (max-width:900px){
  .hdr{padding:14px 16px 4px}
  .privacy{padding:0 16px 8px}
  .privacy .long{display:none}
  .privacy .short{display:inline}
  main{grid-template-columns:minmax(0,1fr);padding:0 14px}
  .viewport{height:min(70dvh,520px);min-height:260px}
  .hover{margin-left:0;width:100%}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important}}

/* Tsuzura: shared footer link to the tool box (same block in every sister site) */
.tz-foot{display:flex;justify-content:center;padding:28px 16px calc(36px + env(safe-area-inset-bottom))}
.tz-link{display:inline-flex;align-items:center;gap:10px;padding:8px 18px 8px 10px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--ink-2);text-decoration:none;font-size:12px;line-height:1.4;--tz-gap:var(--surface);transition:border-color .15s,color .15s}
.tz-link:hover{border-color:var(--line-strong);color:var(--ink)}
.tz-mark{width:24px;height:24px;color:#8E5532;flex-shrink:0}
.tz-name{font-size:14px;font-weight:500;letter-spacing:.12em;color:var(--ink)}
.tz-sub{color:var(--ink-3)}
:root[data-theme="dark"] .tz-mark{color:#C9A063}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .tz-mark{color:#C9A063}}