:root{--font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", system-ui, sans-serif;--bg-app: #f5f5f7;--bg-glass: rgba(255, 255, 255, .78);--bg-card: #ffffff;--bg-subtle: #f2f2f7;--bg-stage: #ebebf0;--text-primary: #1d1d1f;--text-secondary: #86868b;--border-color: rgba(0, 0, 0, .08);--border-strong: rgba(0, 0, 0, .14);--accent: #0071e3;--accent-hover: #0077ed;--accent-soft: rgba(0, 113, 227, .1);--shadow-sm: 0 2px 10px rgba(0, 0, 0, .04);--shadow-lg: 0 20px 45px rgba(0, 0, 0, .08)}body.dark{--bg-app: #000000;--bg-glass: rgba(28, 28, 30, .78);--bg-card: #1c1c1e;--bg-subtle: #2c2c2e;--bg-stage: #121214;--text-primary: #f5f5f7;--text-secondary: #98989d;--border-color: rgba(255, 255, 255, .1);--border-strong: rgba(255, 255, 255, .18);--accent: #0a84ff;--accent-hover: #409cff;--accent-soft: rgba(10, 132, 255, .16);--shadow-sm: 0 2px 10px rgba(0, 0, 0, .3);--shadow-lg: 0 20px 50px rgba(0, 0, 0, .55)}*{box-sizing:border-box;margin:0;padding:0;user-select:none;-webkit-user-select:none;-webkit-font-smoothing:antialiased}body{font-family:var(--font-sans);background-color:var(--bg-app);color:var(--text-primary);min-height:100vh;transition:background-color .25s ease,color .25s ease}.nav{height:54px;background:var(--bg-glass);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0 24px}.nav-brand{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:600;letter-spacing:-.02em}.apple-dot{width:12px;height:12px;border-radius:50%;background:var(--accent)}.nav-controls{display:flex;align-items:center;gap:8px}.btn{font-family:var(--font-sans);font-size:13px;font-weight:500;letter-spacing:-.01em;padding:7px 14px;border-radius:980px;border:1px solid var(--border-color);background:var(--bg-card);color:var(--text-primary);cursor:pointer;transition:all .15s ease;display:inline-flex;align-items:center;justify-content:center;gap:6px}.btn:hover:not(:disabled){border-color:var(--border-strong);background:var(--bg-subtle)}.btn:active:not(:disabled){transform:scale(.98)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff;border-color:transparent;font-weight:600}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:transparent}.container{max-width:1180px;margin:28px auto;padding:0 20px;display:grid;grid-template-columns:340px 1fr;gap:24px;align-items:start}.sidebar{display:flex;flex-direction:column;gap:16px}.card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:20px;padding:18px;box-shadow:var(--shadow-sm)}.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.section-title{font-size:12px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.04em}.upload-zone{border:1.5px dashed var(--border-strong);background:var(--bg-subtle);border-radius:14px;padding:22px 16px;text-align:center;position:relative;cursor:pointer;transition:all .2s ease}.upload-zone:hover,.upload-zone.dragover{border-color:var(--accent);background:var(--accent-soft)}.upload-zone input{position:absolute;top:0;right:0;bottom:0;left:0;opacity:0;cursor:pointer}.upload-title{font-size:14px;font-weight:600;letter-spacing:-.01em;margin-bottom:4px}.upload-sub{font-size:12px;color:var(--text-secondary)}.badge-info{display:none;margin-top:10px;padding:7px 12px;background:var(--bg-subtle);border-radius:10px;font-size:12px;font-weight:500;color:var(--text-secondary);justify-content:space-between}.dim-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}.input-box{background:var(--bg-subtle);border:1px solid transparent;border-radius:12px;padding:8px 12px;display:flex;align-items:center;justify-content:space-between;transition:border-color .15s ease,background .15s ease}.input-box:focus-within{border-color:var(--accent);background:var(--bg-card)}.input-label{font-size:12px;font-weight:600;color:var(--text-secondary)}.input-box input{width:100%;border:none;background:transparent;color:var(--text-primary);font-family:var(--font-sans);font-size:14px;font-weight:600;text-align:right;font-variant-numeric:tabular-nums;outline:none;user-select:text;-webkit-user-select:text}.segmented{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;background:var(--bg-subtle);padding:4px;border-radius:10px;margin-top:12px}.seg-btn{border:none;background:transparent;color:var(--text-primary);font-family:var(--font-sans);font-size:11px;font-weight:600;padding:6px 0;border-radius:7px;cursor:pointer;transition:background .15s,box-shadow .15s}.seg-btn:hover:not(:disabled){background:var(--bg-card);box-shadow:var(--shadow-sm)}.seg-btn:disabled{opacity:.35;cursor:not-allowed}.lock-toggle{display:flex;align-items:center;gap:6px;font-size:12px;font-weight:500;color:var(--text-secondary);cursor:pointer}.lock-toggle input{accent-color:var(--accent);cursor:pointer}.palette{display:flex;flex-wrap:wrap;gap:8px}.color-dot{width:28px;height:28px;border-radius:50%;border:2px solid var(--bg-card);box-shadow:0 0 0 1px var(--border-strong);position:relative;overflow:hidden;cursor:pointer;transition:transform .15s ease}.color-dot:hover{transform:scale(1.12)}.color-dot input{position:absolute;top:-8px;right:-8px;bottom:-8px;left:-8px;width:44px;height:44px;opacity:0;cursor:pointer}.export-stack{display:flex;flex-direction:column;gap:8px}.export-row{display:grid;grid-template-columns:1fr 1fr;gap:8px}.export-row .btn,.export-stack .btn-primary{border-radius:12px;padding:11px 14px}.stage-shell{background:var(--bg-card);border:1px solid var(--border-color);border-radius:24px;box-shadow:var(--shadow-sm);height:620px;display:flex;flex-direction:column;overflow:hidden;position:relative}.stage-area{flex:1;background:var(--bg-stage);display:flex;align-items:center;justify-content:center;overflow:hidden;position:relative;cursor:grab;touch-action:none}.stage-area:active{cursor:grabbing}.artboard{position:relative;border-radius:4px;box-shadow:var(--shadow-lg);border:1px solid var(--border-strong);overflow:hidden;display:flex;align-items:center;justify-content:center}.artboard.checker{background-color:#fff;background-image:linear-gradient(45deg,#ebebef 25%,transparent 25%,transparent 75%,#ebebef 75%,#ebebef),linear-gradient(45deg,#ebebef 25%,transparent 25%,transparent 75%,#ebebef 75%,#ebebef);background-size:16px 16px;background-position:0 0,8px 8px}.artboard.white{background:#fff}.artboard.dark{background:#1c1c1e}.artboard svg{width:100%!important;height:100%!important;display:block;pointer-events:none!important}.empty-hint{font-size:13px;font-weight:500;color:#86868b;background:#ffffffe6;padding:8px 16px;border-radius:980px;box-shadow:var(--shadow-sm)}.floating-dock{position:absolute;bottom:18px;left:50%;transform:translate(-50%);background:var(--bg-glass);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border:1px solid var(--border-strong);border-radius:980px;padding:6px 12px;display:flex;align-items:center;gap:10px;box-shadow:var(--shadow-lg)}.dock-btn{border:none;background:transparent;color:var(--text-primary);font-family:var(--font-sans);font-size:12px;font-weight:600;padding:5px 10px;border-radius:980px;cursor:pointer;transition:background .15s}.dock-btn:hover:not(:disabled){background:var(--bg-subtle)}.dock-btn:disabled{opacity:.35;cursor:not-allowed}.zoom-slider{width:90px;accent-color:var(--accent);cursor:pointer}.zoom-readout{font-size:12px;font-weight:600;font-variant-numeric:tabular-nums;min-width:42px;text-align:center;color:var(--text-secondary)}.divider{width:1px;height:16px;background:var(--border-strong)}.toast{position:fixed;bottom:24px;right:24px;background:var(--text-primary);color:var(--bg-card);padding:10px 18px;border-radius:980px;font-size:13px;font-weight:500;box-shadow:var(--shadow-lg);opacity:0;transform:translateY(8px);pointer-events:none;transition:all .2s ease;z-index:200}.toast.visible{opacity:1;transform:translateY(0)}@media (max-width: 880px){.container{grid-template-columns:1fr;margin:16px auto}.stage-shell{order:-1;height:420px}}