:root{--bg: #1a1d21;--panel: #24282e;--border: #3a4048;--text: #e8eaed;--muted: #9aa0a8;--accent: #4f9cf9}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text)}#app{height:100%;display:flex;flex-direction:column}header{padding:12px 20px;border-bottom:1px solid var(--border);display:flex;align-items:baseline;gap:12px;flex:none}header h1{font-size:18px;margin:0}header .sub{color:var(--muted);font-size:13px}header .version{font-size:11px;color:var(--muted);background:var(--panel);border:1px solid var(--border);border-radius:4px;padding:2px 6px;margin-left:4px}.steps{margin-left:auto;display:flex;gap:4px}.steps button{background:var(--panel);border:1px solid var(--border);color:var(--muted);border-radius:6px;padding:4px 12px;font-size:12px;cursor:pointer}.steps button.active{background:var(--accent);border-color:var(--accent);color:#fff}.units{display:flex;gap:4px}.units button{background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:4px 12px;font-size:12px;cursor:pointer}.units button:hover{border-color:#556}.units button.active{background:var(--accent);border-color:var(--accent);color:#fff}main{flex:1;display:flex;min-height:0}.preview-page{flex:1;display:flex;min-height:0;min-width:0}#sidebar{width:320px;flex:none;padding:16px;border-right:1px solid var(--border);display:flex;flex-direction:column;gap:18px;overflow-y:auto}#viewport{flex:1;position:relative;min-width:0;overflow:hidden}#viewport canvas{display:block;position:absolute;top:0;right:0;bottom:0;left:0}.bp-page{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0}.bp-canvas-wrap{position:relative;flex:1;min-height:0;margin:14px 16px 0}.bp-canvas{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%;background:#15181c;border:1px solid var(--border);border-radius:8px;display:block;touch-action:none;cursor:crosshair}.bp-toolbar{flex:none;display:flex;align-items:flex-end;justify-content:space-between;gap:12px;flex-wrap:wrap;padding:12px 16px}.foot-left{display:flex;flex-direction:column;gap:2px}.foot-right{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.bp-toolbar .hint{color:var(--muted);font-size:12px}.meta-line{white-space:nowrap}.bp-help{flex:none;margin:12px 16px 0;padding:12px 16px;background:var(--panel);border:1px solid var(--border);border-radius:8px;font-size:13px;line-height:1.5}.bp-help h2{margin:0 0 8px;font-size:14px;color:var(--text)}.bp-help ul{margin:0;padding-left:18px;color:var(--muted)}.bp-help li{margin:4px 0}.bp-help strong{color:var(--text)}.bp-help .accent{color:var(--accent)}.bp-help .note{margin-top:8px;color:var(--muted);font-size:12px}.group{display:flex;flex-direction:column;gap:10px}.group-title{font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:600}.segmented{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}.segmented.three{grid-template-columns:repeat(3,1fr)}.segmented button{background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:8px 0;font-size:13px;cursor:pointer;font-weight:500}.segmented button:hover{border-color:#556}.segmented button.active{background:var(--accent);border-color:var(--accent);color:#fff}.segmented.small{grid-template-columns:repeat(2,1fr)}.segmented.small button{padding:5px 10px;font-size:12px}.ctrl{display:grid;grid-template-columns:88px 1fr 58px;align-items:center;gap:10px;font-size:13px}.ctrl .name{color:var(--muted)}input[type=range]{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:100%;height:4px;background:var(--border);border-radius:2px;outline:none}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer}input[type=range]::-moz-range-thumb{width:14px;height:14px;border:none;border-radius:50%;background:var(--accent);cursor:pointer}input.num{width:100%;background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:5px 6px;font-size:12px;text-align:right;font-variant-numeric:tabular-nums;-moz-appearance:textfield;-webkit-appearance:textfield;appearance:textfield}input.num.wide{width:64px;text-align:left}input.num:focus{outline:none;border-color:var(--accent)}input.num::-webkit-outer-spin-button,input.num::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.check{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);cursor:pointer}.check input{accent-color:var(--accent);width:15px;height:15px}button.action{background:var(--accent);color:#fff;border:none;border-radius:6px;padding:10px 14px;font-size:14px;font-weight:600;cursor:pointer}button.action:disabled{opacity:.4;cursor:default}button.action.secondary{background:var(--panel);border:1px solid var(--border);color:var(--text);font-weight:400}.actions{display:flex;flex-direction:column;gap:8px}#status{font-size:13px;color:var(--muted);min-height:1.2em}#status.error{color:#f97b6b}.hint-line{font-size:12px;color:var(--muted)}.mini{color:var(--muted);font-size:13px;display:flex;align-items:center;gap:6px}.mini input{width:64px;background:var(--panel);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:5px 6px;font-size:12px}.stats{display:grid;grid-template-columns:auto 1fr;gap:4px 12px;font-size:12px;color:var(--muted);border-top:1px solid var(--border);padding-top:12px}.stats b{color:var(--text);font-weight:500;text-align:right;font-variant-numeric:tabular-nums}footer{flex:none;padding:8px 20px;border-top:1px solid var(--border);font-size:12px;color:var(--muted)}