:root{--line: #dbe2ea;--accent: #0b57d0;--accent-strong: #0845a5;--toolbar-bg: rgba(255, 255, 255, .95)}*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden}body{font-family:SF Pro Text,PingFang SC,Microsoft YaHei,sans-serif;background:radial-gradient(circle at 20% 20%,#1f2937,#111827 55%,#0b1120);color:#111827}.app{width:100%;height:100%;display:grid;grid-template-rows:auto 1fr auto}.toolbar{position:relative;display:block;padding:12px;background:var(--toolbar-bg);border-bottom:1px solid var(--line)}.toolbar-toggle{display:none;min-height:44px;width:100%;justify-content:center;align-items:center;font-weight:600}.toolbar-panel{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.group{display:flex;align-items:center;gap:8px}.tools{gap:6px}.slider-group{min-width:170px}.slider-group input[type=range]{width:120px}.actions{margin-left:auto}button,.file-label{border:1px solid #c4cfde;background:#fff;color:#152238;border-radius:8px;padding:8px 12px;font-size:13px;line-height:1;cursor:pointer;transition:border-color .15s,background-color .15s,color .15s;min-width:44px;min-height:44px;display:inline-flex;align-items:center;justify-content:center;touch-action:manipulation}button:hover,.file-label:hover{border-color:#95abc9}button:disabled{opacity:.45;cursor:not-allowed}.tool-btn.is-active,button.primary{background:var(--accent);border-color:var(--accent);color:#fff}.tool-btn.is-active:hover,button.primary:hover{background:var(--accent-strong);border-color:var(--accent-strong)}.file-label input{display:none}.workspace{position:relative;min-height:0;touch-action:none}.mobile-pan-btn{position:fixed;top:40%;right:16px;width:56px;height:56px;border-radius:50%;border:none;background:var(--accent);color:#fff;z-index:6;box-shadow:0 8px 20px #0b57d059;display:none;padding:0}.mobile-pan-btn.is-active{background:var(--accent-strong)}.empty-tip{position:absolute;inset:0;display:grid;place-items:center;color:#d1d5db;font-size:18px;letter-spacing:.2px}.gesture-hint{position:absolute;top:10px;left:50%;transform:translate(-50%);z-index:3;background:#0f172abf;color:#f8fafc;padding:8px 12px;border-radius:999px;font-size:12px;pointer-events:none;max-width:calc(100% - 24px);text-align:center}.canvas-scroll{position:absolute;inset:0;overflow:auto;padding:16px;overscroll-behavior:contain;touch-action:none}.canvas-viewport{position:relative;width:fit-content;height:fit-content;background:linear-gradient(45deg,#f5f5f5 25%,transparent 25%),linear-gradient(-45deg,#f5f5f5 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#f5f5f5 75%),linear-gradient(-45deg,transparent 75%,#f5f5f5 75%);background-size:24px 24px;background-position:0 0,0 12px,12px -12px,-12px 0;border:1px solid rgba(255,255,255,.6);box-shadow:0 10px 36px #00000052;-webkit-user-select:none;user-select:none;touch-action:none}#imageCanvas,#maskCanvas{position:absolute;top:0;left:0}#maskCanvas{cursor:none}.canvas-viewport.is-pan-mode #maskCanvas{cursor:grab}.canvas-viewport.is-pan-mode #maskCanvas:active{cursor:grabbing}.brush-cursor{position:absolute;border:1.5px solid #fff;box-shadow:0 0 0 1px #0009;border-radius:50%;pointer-events:none;transform:translate(-50%,-50%)}.status-bar{background:var(--toolbar-bg);border-top:1px solid var(--line);color:#334155;padding:8px 12px;font-size:13px}.dialog{position:fixed;inset:0;background:#0206177a;display:grid;place-items:center;z-index:20;padding:16px}.dialog-panel{width:min(360px,100%);background:#fff;border-radius:12px;border:1px solid #dbe2ea;box-shadow:0 20px 40px #0000003d;padding:16px;display:grid;gap:10px}.dialog-panel h2{margin:0 0 6px;font-size:18px}.dialog-row{display:grid;grid-template-columns:48px 1fr;align-items:center;gap:10px}.dialog-row input[type=number]{width:100%;min-height:40px;border:1px solid #c4cfde;border-radius:8px;padding:6px 10px;font-size:14px}.dialog-row.checkbox-row{grid-template-columns:1fr auto}.dialog-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:4px}.hidden{display:none}@media(max-width:900px){.mobile-pan-btn{display:inline-flex}.tools .tool-btn[data-tool=pan],.tools .tool-btn.mobile-hidden[data-tool=pan]{display:none}.app{grid-template-rows:auto 1fr auto}.toolbar{position:sticky;top:0;z-index:5;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:10px}.toolbar-toggle{display:inline-flex}.toolbar-panel{max-height:0;overflow:hidden;opacity:0;transition:max-height .24s ease,opacity .24s ease,margin-top .24s ease;margin-top:0;width:100%}.toolbar.is-open .toolbar-panel{max-height:min(62vh,520px);opacity:1;margin-top:8px;overflow:auto;align-items:flex-start;padding-right:4px}.group{width:100%;flex-wrap:wrap}.tools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%}.tools .tool-btn{width:100%}.slider-group{min-width:0;display:grid;grid-template-columns:46px 1fr 42px;align-items:center;width:100%;gap:8px}.slider-group input[type=range]{width:100%}.actions{margin-left:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%;gap:8px}.actions button,.file-label{width:100%}.canvas-scroll{padding:10px}.brush-cursor{display:none}}@media(max-width:900px)and (orientation:landscape){.toolbar.is-open .toolbar-panel{max-height:44vh}.status-bar{font-size:12px;padding:6px 10px}}