:root{color-scheme:dark;--bg: #0c060e;--surface: #160d18;--panel: #1c111f;--panel-2: #261625;--panel-3: #2f1b2c;--paper: #ffffff;--paper-grid: #f1ecf1;--paper-ink: #1a1420;--ink: #f7f2f6;--ink-soft: #cdbcc8;--muted: #9a8797;--faint: #715f70;--accent: #ff488b;--accent-strong: #ff2e7e;--accent-ink: #1a0710;--accent-glow: rgba(255, 72, 139, .32);--success: #3ecf8e;--success-bg: rgba(62, 207, 142, .13);--danger: #ff6b6b;--danger-bg: rgba(255, 107, 107, .13);--radius: 10px;--radius-sm: 7px;--radius-lg: 14px;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--font-ui: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif}*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:var(--font-ui);color:var(--ink);background:var(--bg);overflow:hidden;overscroll-behavior:none;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}button{font:inherit}button:focus-visible,input:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:2px}::selection{background:var(--accent);color:var(--accent-ink)}#app{display:flex;flex-direction:column;height:100%}#topbar{display:flex;align-items:center;gap:14px;min-height:52px;padding:8px 16px;background:var(--surface);flex:0 0 auto;flex-wrap:wrap;user-select:none}.brand{display:flex;align-items:baseline;gap:8px;white-space:nowrap}.brand-mark{width:22px;height:22px;color:var(--accent);align-self:center;flex:0 0 auto}.brand-name{font-size:15px;font-weight:700;letter-spacing:-.01em;color:var(--ink)}.brand-sub{font-size:12px;font-weight:500;color:var(--muted)}.status{display:flex;gap:6px;font-size:12px;color:var(--muted);flex-wrap:wrap;min-width:0}.status span{background:var(--panel-2);border-radius:6px;padding:3px 9px;white-space:nowrap;color:var(--ink-soft);font-variant-numeric:tabular-nums}.status span.muted{color:var(--faint)}.status .save-status{background:var(--panel-2);color:var(--ink-soft)}.status .save-status.saved{background:var(--success-bg);color:var(--success)}.status .save-status.save-error{background:var(--danger-bg);color:var(--danger)}.hint{margin-left:auto;font-size:12px;color:var(--faint);white-space:nowrap}#body{display:flex;flex:1 1 auto;min-height:0}#toolbar{width:168px;flex:0 0 auto;background:var(--panel);padding:10px 10px 18px;display:flex;flex-direction:column;gap:2px;user-select:none;overflow-y:auto;overscroll-behavior:contain}.tool-title{display:flex;align-items:center;gap:6px;margin:14px 2px 7px;font-size:11px;font-weight:600;color:var(--faint);letter-spacing:.04em}.tool-title:before{content:"";width:3px;height:11px;border-radius:2px;background:var(--accent);opacity:.85;flex:0 0 auto}.tool-title:first-child{margin-top:4px}.tool-group{display:flex;flex-direction:column;gap:6px}.tool-group.grid-2,.tool-group.grid-4{display:grid;grid-template-columns:1fr 1fr;gap:6px}.tool-group.grid-3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px}.tool-group button{display:flex;align-items:center;gap:6px;font:inherit;font-size:12px;font-weight:500;padding:8px 9px;border:none;border-radius:var(--radius-sm);background:transparent;color:var(--ink-soft);cursor:pointer;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;transition:background .12s ease,color .12s ease,transform .06s ease}.tool-group button .icon{width:15px;height:15px;flex:0 0 auto}.tool-group button:hover:not(:disabled){background:var(--panel-2);color:var(--ink)}.tool-group button:active:not(:disabled){background:var(--panel-3);transform:translateY(.5px)}.tool-group button:disabled{opacity:.38;cursor:not-allowed}.tool-group button.tool.active{background:var(--accent);color:var(--accent-ink);font-weight:600}.tool-group.grid-3 button{flex-direction:column;gap:4px;padding:9px 2px 7px;font-size:10.5px;text-align:center}.tool-group.grid-3 button .icon{width:18px;height:18px}.field{display:flex;flex-direction:column;gap:5px;font-size:12px;color:var(--muted)}.field b{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}.field input[type=color]{width:100%;height:32px;padding:0;border:none;border-radius:var(--radius-sm);background:var(--panel-2);cursor:pointer}.field input[type=color]::-webkit-color-swatch-wrapper{padding:3px}.field input[type=color]::-webkit-color-swatch{border:none;border-radius:5px}.field input[type=color]::-moz-color-swatch{border:none;border-radius:5px}.field input[type=range]{width:100%;accent-color:var(--accent)}#canvas-wrap{position:relative;flex:1 1 auto;min-width:0;overflow:hidden;background:var(--paper)}#board{position:absolute;inset:0;display:block;touch-action:none;cursor:default}#board[data-tool=pen],#board[data-tool=line],#board[data-tool=rect],#board[data-tool=eraser]{cursor:crosshair}#board[data-tool=text]{cursor:text}#board[data-tool=select]{cursor:default}#board.panning{cursor:grab}#board.panning:active{cursor:grabbing}.empty-state{position:absolute;inset:0;z-index:4;display:flex;align-items:center;justify-content:center;padding:20px;pointer-events:none;opacity:0;visibility:hidden;transition:opacity .2s ease}.empty-state.visible{opacity:1;visibility:visible}.empty-card{pointer-events:auto;max-width:460px;width:100%;text-align:center;background:var(--panel);border-radius:var(--radius-lg);padding:32px 32px 26px;box-shadow:0 20px 60px #00000061;transform:translateY(10px) scale(.99);transition:transform .24s cubic-bezier(.2,.8,.3,1)}.empty-state.visible .empty-card{transform:translateY(0) scale(1)}.empty-icon{width:52px;height:52px;color:var(--accent);margin-bottom:14px}.empty-card h2{margin:0 0 8px;font-size:21px;font-weight:700;letter-spacing:-.01em;color:var(--ink)}.empty-card p{margin:0 0 20px;font-size:13.5px;line-height:1.7;color:var(--ink-soft)}.empty-actions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center}.empty-actions button{display:inline-flex;align-items:center;gap:6px;font:inherit;font-size:13px;font-weight:500;padding:9px 16px;border:none;border-radius:var(--radius-sm);background:var(--panel-2);color:var(--ink);cursor:pointer;transition:background .12s ease,transform .06s ease}.empty-actions button .icon{width:15px;height:15px}.empty-actions button:hover{background:var(--panel-3)}.empty-actions button:active{transform:translateY(.5px)}.empty-actions button.primary{background:var(--accent);color:var(--accent-ink);font-weight:600;transition:background .12s ease,transform .06s ease}.empty-actions button.primary:hover{background:var(--accent-strong)}.empty-card .empty-tips{margin:18px 0 0;font-size:11.5px;color:var(--faint)}#minimap-wrap{position:absolute;right:14px;bottom:14px;z-index:6;background:var(--panel);border-radius:var(--radius);box-shadow:0 8px 28px #0006;padding:6px;user-select:none;max-width:calc(100% - 28px)}#minimap-title{font-size:10px;color:var(--muted);padding:0 3px 4px;line-height:1}#minimap{display:block;width:180px;height:120px;max-width:100%;border-radius:6px;cursor:pointer}#ghost-cursor{position:absolute;left:0;top:0;z-index:8;pointer-events:none;transition:none;will-change:transform;filter:drop-shadow(0 2px 5px rgba(0,0,0,.3))}#ghost-cursor.hidden{display:none}#ghost-cursor svg{display:block}#ghost-cursor .ghost-label{display:inline-block;margin:2px 0 0 12px;padding:2px 8px;border-radius:10px;background:var(--accent);color:#fff;font-size:11px;white-space:nowrap}.tool-group button.demo-btn.on{background:var(--accent);color:var(--accent-ink);font-weight:600}.tool-group .note{margin:2px 0 0;font-size:10.5px;line-height:1.6;color:var(--faint)}.text-editor{position:absolute;z-index:10;min-width:80px;max-width:60%;padding:4px 6px;border:2px solid var(--accent);border-radius:6px;background:#fffffff7;outline:none;resize:both;font-family:inherit;line-height:1.3;color:var(--paper-ink);box-shadow:0 4px 16px #0003}.toast-host{position:fixed;left:50%;bottom:20px;transform:translate(-50%);z-index:60;display:flex;flex-direction:column;align-items:center;gap:8px;pointer-events:none;width:min(92vw,460px)}.toast{pointer-events:auto;max-width:100%;padding:10px 16px;border-radius:10px;font-size:13px;line-height:1.5;color:var(--ink);background:var(--panel-3);box-shadow:0 10px 30px #00000073;cursor:pointer;opacity:0;transform:translateY(10px) scale(.98);transition:opacity .2s ease,transform .2s ease;word-break:break-word;border-left:3px solid var(--faint)}.toast.show{opacity:1;transform:translateY(0) scale(1)}.toast-success{border-left-color:var(--success)}.toast-error{border-left-color:var(--danger)}.busy-bar{position:fixed;top:0;left:0;z-index:70;height:3px;width:30%;background:var(--accent);opacity:0;transition:opacity .15s ease}body.busy .busy-bar{opacity:1;animation:busy-slide 1.1s ease-in-out infinite}@keyframes busy-slide{0%{left:-30%}to{left:100%}}@media(prefers-reduced-motion:reduce){.busy-bar,.toast,.empty-state,.empty-card,.tool-group button,.empty-actions button{transition:none;animation:none}.empty-card{transform:none}}@media(max-width:760px){#topbar{gap:6px 10px;padding:6px 10px;min-height:48px}#topbar .hint{display:none}#body{flex-direction:column}#canvas-wrap{order:1}#toolbar{order:2;flex-direction:row;align-items:center;width:100%;height:66px;padding:6px 8px;gap:8px;border-right:none;overflow-x:auto;overflow-y:hidden;scrollbar-width:none}#toolbar::-webkit-scrollbar{display:none}#toolbar .tool-title,#toolbar .note{display:none}#toolbar .tool-group{flex:0 0 auto}#toolbar .tool-group.grid-2,#toolbar .tool-group.grid-3,#toolbar .tool-group.grid-4{display:flex;flex-direction:row;gap:6px}#toolbar .tool-group.grid-3 button{min-width:54px}#toolbar .field{flex:0 0 auto;flex-direction:row;align-items:center;gap:6px;white-space:nowrap}#toolbar .field input[type=range]{width:76px}#toolbar .field input[type=color]{width:44px;height:32px}#minimap{width:130px;height:86px}.toast-host{bottom:78px}}@media(max-width:480px){#minimap-wrap{display:none}#topbar .status span{padding:2px 6px}#topbar .status #coord-label,.brand-sub{display:none}}