:root{--navy:#0b2742;--gold:#f2b632;--light:#f4f6f8;--border:#dce2e8;--text:#24313c}
*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:#edf1f4;color:var(--text)}
.topbar{background:linear-gradient(90deg,#071f35,#0d385f);color:white;padding:18px 28px;display:flex;justify-content:space-between;align-items:center;gap:20px}.topbar h1{margin:0;font-size:clamp(20px,3vw,34px)}.topbar p{margin:6px 0 0;color:#f6c451;font-weight:700}.print-btn,.viewer-actions button,.calculate-btn{border:0;border-radius:8px;padding:11px 16px;font-weight:700;cursor:pointer}.print-btn,.calculate-btn{background:var(--gold);color:#1d2730}
.app-shell{display:grid;grid-template-columns:360px 1fr;gap:18px;padding:18px}.panel{background:white;border-radius:14px;box-shadow:0 5px 20px rgba(0,0,0,.08)}.controls{padding:18px;max-height:calc(100vh - 130px);overflow:auto}.controls h2,.visualizer-panel h2{margin:4px 0 12px;color:var(--navy);font-size:18px}.room-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.room-card{background:white;border:2px solid var(--border);border-radius:10px;padding:6px;cursor:pointer}.room-card.active{border-color:var(--gold);box-shadow:0 0 0 3px rgba(242,182,50,.25)}.room-card img{width:100%;height:90px;object-fit:cover;border-radius:7px}.room-card span{display:block;padding:7px 3px 3px;font-weight:700}.surface-buttons{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}.surface-buttons button{border:1px solid #b9c5cf;background:#f7f9fb;padding:8px 10px;border-radius:18px;cursor:pointer}.surface-buttons button.active{background:var(--navy);color:white}.shade-search-wrap input{width:100%;padding:10px;border:1px solid var(--border);border-radius:8px;margin-bottom:10px}.shade-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.shade-card{display:grid;grid-template-columns:34px 1fr;grid-template-rows:auto auto;column-gap:8px;text-align:left;border:1px solid var(--border);background:white;border-radius:8px;padding:6px;cursor:pointer}.shade-card .swatch{grid-row:1/3;width:34px;height:34px;border-radius:6px;border:1px solid rgba(0,0,0,.12)}.shade-card small{color:#697783}.shade-card b{font-size:12px}.shade-card.active{outline:2px solid var(--gold)}
.visualizer-panel{padding:18px}.viewer-head{display:flex;justify-content:space-between;align-items:center;gap:16px}.viewer-head p{margin:0 0 10px;color:#697783}.viewer-actions{display:flex;gap:8px}.viewer-actions button{background:#e8eef3}.room-stage{position:relative;overflow:hidden;border-radius:14px;background:#dfe6eb;aspect-ratio:16/9}.room-stage>img{width:100%;height:100%;object-fit:cover;display:block}.surface-layer{position:absolute;inset:0;mix-blend-mode:multiply;opacity:.72;transition:background .25s}.surface-layer.selected{outline:3px dashed rgba(255,255,255,.95);outline-offset:-4px}.selection-summary{padding:12px 2px;font-size:15px}.cost-card{border-top:1px solid var(--border);padding-top:16px}.form-grid{display:grid;grid-template-columns:repeat(4,minmax(130px,1fr));gap:10px}.form-grid label{font-size:12px;font-weight:700;color:#56636f}.form-grid input,.form-grid select{width:100%;margin-top:5px;padding:9px;border:1px solid var(--border);border-radius:7px;background:white}.calculate-btn{margin:14px 0}.estimate-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.estimate-grid div{background:#f4f7fa;border-radius:10px;padding:12px}.estimate-grid span{display:block;font-size:12px;color:#687784}.estimate-grid strong{display:block;margin-top:5px;color:var(--navy)}.estimate-grid .grand{background:#fff3ce}.disclaimer{font-size:11px;color:#6e7880;margin-top:12px}footer{text-align:center;padding:14px;background:#0b2742;color:white;font-size:13px}
@media(max-width:1000px){.app-shell{grid-template-columns:1fr}.controls{max-height:none}.form-grid{grid-template-columns:repeat(2,1fr)}.estimate-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.topbar{align-items:flex-start;flex-direction:column}.app-shell{padding:10px}.form-grid,.estimate-grid{grid-template-columns:1fr}.room-grid{grid-template-columns:1fr 1fr}.viewer-head{align-items:flex-start;flex-direction:column}}
@media print{.controls,.viewer-actions,.print-btn,.calculate-btn,footer{display:none!important}.app-shell{display:block;padding:0}.visualizer-panel{box-shadow:none}.topbar{padding:10px}.cost-card{break-inside:avoid}}
/* Level 2 real-photo visualizer */
.level2-shell{display:grid;grid-template-columns:380px minmax(0,1fr);gap:18px;padding:18px;max-width:1800px;margin:auto}.controls section{border-bottom:1px solid #dfe5ec;padding-bottom:18px;margin-bottom:18px}.top-actions{display:flex;gap:10px}.top-actions button,.viewer-actions button,.button-grid button{border:0;border-radius:7px;padding:10px 13px;cursor:pointer;font-weight:700}.upload-box{display:block;border:2px dashed #1a4b78;background:#eef6ff;border-radius:10px;padding:18px;text-align:center;font-weight:800;cursor:pointer}.upload-box input{display:none}.sample-title{margin:12px 0 8px;font-size:.9rem;color:#536273}.help{font-size:.88rem;color:#5b6774}.button-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:10px 0}.button-grid .primary{background:#164e7b;color:white}.button-grid .danger{background:#9f2e2e;color:white}.controls label{display:block;font-weight:700;margin-top:10px}.controls input[type=text],.controls input[type=search],.controls input:not([type]){width:100%;box-sizing:border-box;padding:10px;border:1px solid #cbd5df;border-radius:6px;margin-top:5px}.mask-list{display:grid;gap:7px;margin-top:10px}.mask-list button{display:flex;justify-content:space-between;align-items:center;padding:9px 10px;border:1px solid #ccd5de;background:white;border-radius:7px;cursor:pointer}.mask-list button.active{outline:3px solid #ffb000}.mask-list small{color:#667}.work-panel{min-width:0}.canvas-wrap{position:relative;background:#20252a;min-height:460px;display:flex;align-items:center;justify-content:center;overflow:auto;border-radius:10px}.canvas-wrap canvas{display:block;max-width:100%;height:auto;cursor:crosshair}.canvas-wrap #emptyHint{position:absolute;color:white;font-size:1.1rem}.statusbar{display:flex;justify-content:space-between;gap:20px;padding:10px 4px;font-size:.9rem;color:#4d5a67}.shade-card{min-height:78px}.controls input[type=range]{width:100%}@media(max-width:1050px){.level2-shell{grid-template-columns:1fr}.controls{order:2}.work-panel{order:1}}@media print{.controls,.top-actions,.viewer-actions,.statusbar{display:none!important}.level2-shell{display:block;padding:0}.canvas-wrap{background:white;min-height:0}.work-panel{box-shadow:none}.topbar{padding:10px}}

/* Surface marking reliability improvements */
.canvas-wrap canvas{touch-action:none;user-select:none;-webkit-user-select:none}
.canvas-wrap canvas.drawing-mode{cursor:crosshair;outline:4px solid #ffb000;outline-offset:-4px}
#newMaskBtn.active-tool{background:#ffb000;color:#17212b;box-shadow:0 0 0 4px rgba(255,176,0,.25)}
@media(max-width:700px){.canvas-wrap{min-height:300px}.statusbar{flex-direction:column;gap:4px}.button-grid button{min-height:48px}.canvas-wrap canvas{width:100%;max-width:none}}