:root{--paper:#f4f6f6;--ink:#17232b;--ink-soft:#2a3a44;--muted:#5b6870;--line:#cfd8d8;--blue:#2b56c6;--snap:#cf4a22;--tap:48px;color:var(--ink);background:var(--paper);font-family:system-ui,sans-serif;font-size:16px}*{box-sizing:border-box}html,body{overscroll-behavior:none;-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;-webkit-user-select:none;user-select:none;height:100%;margin:0}button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation;background:0 0;border:0;padding:0}button:focus-visible{outline:2px solid var(--blue);outline-offset:2px}svg{fill:none;stroke:currentColor;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;width:24px;height:24px}[hidden]{display:none!important}.app{grid-template-rows:1fr auto;height:100dvh;display:grid}.stage{min-height:0;padding:env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);position:relative}#editor{touch-action:none;position:absolute;inset:0;overflow:hidden}.floors{top:calc(env(safe-area-inset-top) + 8px);left:max(8px, env(safe-area-inset-left));right:max(8px, env(safe-area-inset-right));scrollbar-width:none;pointer-events:none;gap:6px;display:flex;position:absolute;overflow-x:auto}.floors::-webkit-scrollbar{display:none}.floors button{pointer-events:auto;border:1px solid var(--line);background:var(--paper);white-space:nowrap;text-overflow:ellipsis;border-radius:20px;flex:none;min-width:40px;max-width:16ch;min-height:40px;padding:0 14px;overflow:hidden}.floors button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:var(--paper)}.dimension{top:calc(env(safe-area-inset-top) + 56px);pointer-events:none;font-variant-numeric:tabular-nums;color:var(--blue);background:color-mix(in srgb, var(--paper) 88%, transparent);white-space:nowrap;align-items:center;gap:10px;padding:2px 14px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:26px;font-weight:600;display:flex;position:absolute;left:50%;transform:translate(-50%)}.dimension:before,.dimension:after{content:"";border:solid var(--blue);background:linear-gradient(var(--blue), var(--blue)) center / 100% 2px no-repeat;border-width:0 2px;width:28px;height:18px}.dimension span:after{content:" m";font-size:16px;font-weight:500}.zoom{right:max(12px, env(safe-area-inset-right));gap:8px;display:grid;position:absolute;bottom:56px}.round{width:var(--tap);height:var(--tap);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:50%;place-items:center;display:grid}.round:active{background:#e3e9e9}.hint{left:max(16px, env(safe-area-inset-left));right:calc(var(--tap) + 28px);color:var(--muted);pointer-events:none;margin:0;font-size:14px;line-height:1.3;position:absolute;bottom:14px}.dock{width:100%;max-width:520px;padding:6px 8px max(6px, env(safe-area-inset-bottom));background:var(--ink);color:var(--paper);border-radius:20px 20px 0 0;grid-template-columns:repeat(5,1fr);margin:0 auto;display:grid}.dock button{border-radius:14px;align-content:center;justify-items:center;gap:3px;min-height:56px;font-size:11.5px;display:grid}.dock button[aria-pressed=true]{background:var(--blue)}.dock button:active:not(:disabled){background:var(--ink-soft)}.dock button[aria-pressed=true]:active{background:var(--blue)}.dock button:disabled{opacity:.35;cursor:default}.dock button:focus-visible{outline-color:var(--paper);outline-offset:-3px}.sheet{background:var(--paper);width:100%;max-width:520px;color:var(--ink);border:0;border-radius:20px 20px 0 0;margin:auto auto 0;padding:0}.sheet::backdrop{background:#17232b73}.sheet-body{padding:20px 16px max(16px, env(safe-area-inset-bottom));gap:18px;display:grid}.sheet h2{margin:0;font-size:18px}.sheet-label{color:var(--muted);margin:8px 0 0;font-size:14px}.sheet-actions button{min-height:var(--tap);border:1px solid var(--line);background:#fff;border-radius:12px;padding:0 12px}.sheet-actions{gap:8px;display:grid}.sheet-actions .danger{color:var(--snap)}.sheet-actions button:disabled{opacity:.4;cursor:default}#import-list{padding-left:12px}.sheet .done{min-height:var(--tap);background:var(--ink);color:var(--paper);border-radius:12px;font-weight:600}@media (prefers-reduced-motion:no-preference){.sheet[open]{animation:.18s ease-out sheet-up}@keyframes sheet-up{0%{opacity:0;transform:translateY(24px)}}}