*{box-sizing:border-box}
:root{color-scheme:dark}
html,body{margin:0;min-height:100%;overflow:hidden}
body{background:#0d1c29;color:#e9f0f4;font-family:system-ui,-apple-system,sans-serif;height:100dvh;display:flex;flex-direction:column}
header{display:flex;align-items:center;gap:10px;padding:10px 14px;padding-top:max(10px,env(safe-area-inset-top));background:#122b3b;border-bottom:1px solid #29434e;flex:none}
header strong{font-size:19px;line-height:1.1}small{display:block;color:#a9c2cc;font-size:11px;margin-top:2px}
.logo{font-size:28px;color:#64d5bb}.brand{min-width:0}button{border:1px solid #385361;background:#193343;color:#f2f7fa;border-radius:10px;padding:9px 10px;font-size:14px;min-height:42px;cursor:pointer}
button:hover{background:#294959}button:focus-visible{outline:3px solid #64d5bb}button[hidden]{display:none!important}
.primary,.accent{background:#66d8bb;color:#102c31;border-color:#66d8bb;font-weight:750}
#choose{margin-left:auto;white-space:nowrap}
main{flex:1;min-height:0;position:relative;overflow:hidden}
canvas{display:block;width:100%;height:100%;touch-action:none}
#welcome{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px;overflow:auto;background:radial-gradient(ellipse at 50% 15%,#244b5cbb,transparent 70%),#0d1c29}
#welcome[hidden]{display:none}.tag{padding:7px 12px;border:1px solid #3d675f;border-radius:40px;font-size:12px;color:#81dcc4}
h1{font-size:clamp(27px,7vw,42px);letter-spacing:-1px;margin:22px 0 6px}p{font-size:15px;color:#c3d4dc;margin:8px 0 18px}
#welcome button{width:min(280px,100%);margin:4px}.tips{font-size:12px;color:#aac3ce;line-height:1.7;margin-top:17px}
.caption{position:absolute;top:9px;left:9px;right:9px;display:flex;justify-content:space-between;gap:10px;pointer-events:none;font-size:12px}
.caption span{background:#122b3be9;padding:6px 9px;border-radius:7px;max-width:78%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
nav{position:absolute;bottom:10px;left:50%;transform:translateX(-50%);display:flex;gap:4px;background:#0e2533e8;padding:5px;border-radius:12px;max-width:calc(100% - 12px)}
nav button{white-space:nowrap;padding:8px 9px}
footer{display:flex;align-items:center;justify-content:space-between;padding:7px 10px;padding-bottom:max(7px,env(safe-area-inset-bottom));border-top:1px solid #29434e;font-size:11px;color:#bed0d9;gap:8px;flex:none}
footer button{font-size:12px;padding:5px 8px;min-height:36px}#status{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
#busy{position:absolute;inset:0;place-items:center;background:#0d1c29e8;font-size:16px;text-align:center;padding:24px;z-index:4}
#busy:not([hidden]){display:grid}
dialog{border:1px solid #385361;border-radius:15px;background:#122b3b;color:#edf5f6;padding:16px;width:min(92vw,520px);max-height:85dvh;overflow:auto}
dialog::backdrop{background:#000a}.dialoghead{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:10px}
#content{line-height:1.55;font-size:14px;overflow-wrap:anywhere;white-space:pre-line}
#content p{margin:0 0 12px;color:#d0dfe5;font-size:13px}
label.layer{display:flex;align-items:center;gap:10px;padding:7px;border-bottom:1px solid #29434e}
input[type=checkbox]{width:20px;height:20px;accent-color:#66d8bb}
.tolerance-choice,.area-choice{width:100%;display:flex;align-items:center;justify-content:space-between;gap:10px;text-align:left;margin:5px 0}
.tolerance-choice span{font-size:12px;color:#d8e7ed}.area-choice{display:block}
a{color:#81dcc4}
@media(max-width:600px){nav{width:calc(100% - 12px);display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:4px}nav.many{grid-template-columns:repeat(5,minmax(0,1fr))}nav button{font-size:12px;padding:6px 3px;min-height:40px}.tolerance-choice{flex-direction:column;align-items:flex-start}}
@media(max-height:520px){header{padding-block:5px}.logo{display:none}header strong{font-size:16px}nav{bottom:4px}footer{padding-block:3px}#welcome h1{margin:8px 0}#welcome .tips{margin-top:8px}}