:root{--brand: #4f46e5;--brand-hover: #4338ca;--brand-light: #eef2ff;--brand-deep: #3730a3;--brand-glow: rgba(79, 70, 229, .16);--cyan: #0284c7;--cyan-light: #f0f9ff;--amber: #d97706;--amber-light: #fffbeb;--amber-border: #fcd34d;--mint: #059669;--mint-light: #ecfdf5;--mint-border: #a7f3d0;--purple: #7c3aed;--purple-light: #f5f3ff;--bg: #f8fafc;--paper: #ffffff;--paper-elevated: #ffffff;--ink: #0f172a;--ink-secondary: #334155;--muted: #64748b;--line: #e2e8f0;--line-strong: #cbd5e1;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .05);--shadow-sm: 0 2px 6px -1px rgba(15, 23, 42, .06), 0 1px 4px -1px rgba(15, 23, 42, .04);--shadow-md: 0 6px 18px -3px rgba(15, 23, 42, .08), 0 3px 8px -2px rgba(15, 23, 42, .04);--shadow-lg: 0 14px 30px -4px rgba(15, 23, 42, .12), 0 6px 12px -3px rgba(15, 23, 42, .06);--grad-brand: linear-gradient(135deg, #4f46e5 0%, #6366f1 50%, #7c3aed 100%);--grad-subtle: linear-gradient(135deg, #f8fafc 0%, #eef2ff 100%);--grad-highlight: linear-gradient(135deg, #10b981 0%, 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var(--line);font-size:12px}.ground-label{color:var(--muted);font-weight:600}.ground-controls button{font-size:11px;padding:4px 8px;border-radius:6px}.ground-spec{margin-left:auto;color:var(--muted);font-variant-numeric:tabular-nums}.message{min-height:32px;padding:6px 18px;font-size:12px;color:var(--mint);font-weight:600;background:#fff}.projection-header{display:flex;align-items:center;justify-content:space-between;gap:10px;border-top:1px solid var(--line);padding:14px 18px 0}.projection-title{display:inline-flex;align-items:center;gap:6px}.projection-icon{color:var(--brand)}.projection-header h2{font-size:13px;font-weight:700;margin:0}.projection-hint{font-size:11px;color:var(--muted)}.views{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;padding:12px 18px}.view{text-align:center;border:1px solid var(--line);border-radius:10px;background:#f8fafc;padding:8px;transition:all .2s 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summary:hover{color:var(--brand)}.grid-scroll{overflow:auto;max-height:260px;padding:12px 0}.matrix{display:grid;gap:4px;width:max-content;margin:0 auto}.matrix button{width:36px;height:36px;padding:0;border-radius:8px;background:#f1f5f9;border:1px solid #cbd5e1;box-shadow:none;color:#64748b;font-weight:700;font-size:13px}.matrix button:hover:not(:disabled){border-color:var(--brand);color:var(--brand);background:#fff}.matrix button.on{background:linear-gradient(135deg,#10b981,#059669);border-color:#047857;color:#fff;box-shadow:0 2px 4px #05966940}.direction{text-align:center;font-size:11px;font-weight:600;color:var(--muted);margin:6px 0}.tabs{display:flex;gap:4px;padding:8px 10px 0;background:#f8fafc;border-bottom:1px solid var(--line)}.tabs button{border:none;background:transparent;box-shadow:none;flex:1;padding:10px 6px;font-size:12px;color:var(--muted);border-radius:8px 8px 0 0;border-bottom:2px solid transparent}.tabs button:hover:not(:disabled):not(.active){color:var(--ink);background:#fff9;transform:none}.tabs button.active{background:var(--paper);color:var(--brand);font-weight:700;border-bottom-color:var(--brand)}.tab-icon{flex-shrink:0}.content{padding:20px}.guide{list-style:none;counter-reset:step;padding:0;margin:16px 0}.guide li{counter-increment:step;display:grid;grid-template-columns:26px 1fr;gap:0 10px;margin:14px 0;align-items:center}.guide li:before{content:counter(step);grid-row:span 2;border-radius:6px;background:var(--brand-light);border:1px solid #c7d2fe;text-align:center;height:24px;line-height:24px;color:var(--brand-deep);font-weight:800;font-size:12px}.guide li b{color:var(--ink);font-size:13px}.guide li span{color:var(--muted);font-size:12px}.note{background:#fbfbfe;border:1px solid #e0e7ff;border-left:3px solid var(--brand);color:#3730a3;padding:12px 14px;border-radius:8px;font-size:12px;line-height:1.8;margin:16px 0}.note b{display:block;margin-bottom:2px}.note p{margin:0;color:#4338ca}.example-buttons{display:flex;gap:6px;flex-wrap:wrap;margin:12px 0}.example-buttons button{font-size:11px;padding:6px 10px}.small{font-size:11px!important;color:var(--muted)}.field{display:flex;flex-direction:column;gap:6px;margin:14px 0;font-size:12px;font-weight:600;color:var(--ink-secondary)}.dimensions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px}.dimensions input{width:58px;text-align:center}.dimensions button{font-size:12px;padding:6px 12px}.height-inputs{display:flex;gap:6px;flex-wrap:wrap}.height-inputs label{display:flex;flex-direction:column;gap:3px;font-size:10px;color:var(--muted);text-align:center;font-weight:600}.height-inputs input{width:48px;text-align:center;padding:5px}.condition-preview{display:flex;gap:8px;margin:12px 0}.condition-preview>div{flex:1;text-align:center;font-size:10px;font-weight:600;color:var(--muted);border:1px solid var(--line);border-radius:8px;padding:6px;background:#f8fafc}.condition-preview svg{height:60px;width:100%}.result{margin-top:16px;font-size:13px;line-height:1.8}.result.error{background:#fef2f2;border:1px solid #fecaca;padding:12px;border-radius:10px;color:#991b1b;font-weight:500}.result-numbers{display:flex;gap:10px;margin-bottom:10px}.result-numbers>div{flex:1;padding:12px 14px;border-radius:10px;font-size:12px}.result-numbers>div:first-child{background:var(--mint-light);border:1px solid var(--mint-border)}.result-numbers>div:last-child{background:var(--amber-light);border:1px solid var(--amber-border)}.result-numbers strong{display:block;font-size:24px;font-weight:800;letter-spacing:-.5px}.result-numbers>div:first-child strong{color:var(--mint)}.result-numbers>div:last-child strong{color:var(--amber)}.check-result-banner{display:flex;align-items:center;gap:8px;margin-top:12px;padding:10px 14px;border-radius:8px;font-size:12px;font-weight:600}.check-result-banner.ok{background:var(--mint-light);border:1px solid var(--mint-border);color:var(--mint)}.check-result-banner.fail{background:var(--amber-light);border:1px solid var(--amber-border);color:var(--amber)}.method{border-top:1px solid var(--line);margin-top:18px;padding-top:12px;font-size:12px;color:var(--ink-secondary)}.method summary{cursor:pointer;font-weight:600}.method summary:hover{color:var(--brand)}.metric{border-bottom:1px dashed var(--line);padding:12px 0}.metric small{color:var(--muted);font-size:11px}.metric strong{display:block;font-size:24px;font-weight:800;color:var(--brand);letter-spacing:-.5px;margin:2px 0}.metric span{font-size:11px;color:#64748b;font-variant-numeric:tabular-nums}.equation{font-size:12px;line-height:1.8;padding:10px 14px;background:#f8fafc;border:1px solid var(--line);border-radius:8px;color:var(--ink-secondary);font-variant-numeric:tabular-nums;margin:12px 0}.btn-highlight{margin:12px 0}.face-legend{display:flex;gap:12px;font-size:11px;flex-wrap:wrap;margin:8px 0}.legend-item{display:inline-flex;align-items:center;gap:6px;font-weight:600}.swatch{width:10px;height:10px;border-radius:3px}.swatch-top{background:#10b981}.swatch-side{background:#f59e0b}.swatch-bottom{background:#8b5cf6}.notfound{text-align:center;padding:80px 20px;max-width:480px;margin:0 auto}.notfound-icon-wrap{display:inline-flex;align-items:center;justify-content:center;width:96px;height:96px;border-radius:24px;background:#eef2ff;border:1px solid #c7d2fe;color:var(--brand);margin-bottom:16px;box-shadow:0 8px 24px #4f46e51f}.notfound h1{font-size:24px;margin:10px 0}.notfound .cta{display:inline-flex;align-items:center;gap:6px;margin-top:18px;background:var(--grad-brand);color:#fff;text-decoration:none;font-weight:700;border-radius:10px;padding:10px 22px;box-shadow:0 4px 14px #4f46e54d;transition:all .18s ease}.notfound .cta:hover{background:linear-gradient(135deg,#4338ca,#4f46e5);transform:translateY(-2px);box-shadow:0 6px 18px #4f46e566}footer{margin-top:24px;font-size:11px;color:var(--muted);background:var(--paper);border:1px solid var(--line);border-radius:10px;padding:10px 16px;line-height:1.7}@media(max-width:1024px){.workspace{grid-template-columns:1fr}.stage-panel .scene-svg{height:360px}}@media(max-width:960px){.site-header{flex-wrap:wrap;gap:8px 12px;padding:10px 16px}.nav-subjects{order:3;width:100%;overflow-x:auto;padding:2px 0}.header-right{min-width:auto}}@media(max-width:768px){main{padding:16px}.home-intro h1{font-size:28px}.deco-1,.deco-2{display:none}.geometry-heading{flex-direction:column;align-items:flex-start}.views{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important}}