:root{--c-bg: #fbfbfd;--c-surface: #ffffff;--c-surface-secondary: #f5f5f7;--c-primary: #1d1d1f;--c-primary-light: #424245;--c-secondary: #86868b;--c-tertiary: #d2d2d7;--c-border: #e8e8ed;--c-border-light: #f0f0f5;--c-accent: #0071e3;--c-accent-hover: #0077ed;--c-accent-light: rgba(0, 113, 227, .08);--c-text-primary: #1d1d1f;--c-text-secondary: #86868b;--c-text-tertiary: #aeaeb2;--c-text-inverse: #ffffff;--c-overlay: rgba(0, 0, 0, .4);--c-overlay-light: rgba(0, 0, 0, .04);--sp-1: 4px;--sp-2: 8px;--sp-3: 12px;--sp-4: 16px;--sp-5: 20px;--sp-6: 24px;--sp-8: 32px;--sp-10: 40px;--sp-12: 48px;--sp-16: 64px;--sp-20: 80px;--f-sans: -apple-system, "SF Pro Display", "SF Pro Text", "Noto Sans SC", "PingFang SC", "Helvetica Neue", sans-serif;--f-serif: "Noto Serif SC", "Songti SC", "STSong", serif;--f-mono: "SF Mono", "Menlo", "Consolas", monospace;--f-handwriting: "ZCOOL QingKe HuangYou", cursive;--fs-2xs: 10px;--fs-xs: 12px;--fs-sm: 13px;--fs-base: 15px;--fs-lg: 17px;--fs-xl: 20px;--fs-2xl: 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.pos-img{background-color:var(--c-accent)}.pos-text{background-color:var(--c-border);border-radius:1px}.pos-bottom{flex-direction:column}.pos-bottom .pos-img{flex:2}.pos-bottom .pos-text{flex:1}.pos-top{flex-direction:column}.pos-top .pos-img{flex:2;order:-1}.pos-top .pos-text{flex:1}.pos-left{flex-direction:row}.pos-left .pos-img{flex:2}.pos-left .pos-text{flex:1}.pos-right{flex-direction:row}.pos-right .pos-img{flex:2;order:1}.pos-right .pos-text{flex:1}.position-label{font-size:var(--fs-2xs);font-weight:var(--fw-medium);color:var(--c-text-secondary)}.position-item.active .position-label{color:var(--c-accent)}.single-editor{display:flex;flex-direction:column;height:100%;overflow:hidden}.text-input-bar{padding:var(--sp-2) var(--sp-5);background-color:var(--c-surface);border-bottom:.5px solid var(--c-border-light)}.text-input-field{width:100%;padding:var(--sp-2) var(--sp-3);font-size:var(--fs-base);color:var(--c-text-primary);background-color:var(--c-surface-secondary);border:none;border-radius:var(--r-md);outline:none;transition:box-shadow var(--t-normal)}.text-input-field:focus{box-shadow:0 0 0 2px var(--c-accent)}.text-input-field::placeholder{color:var(--c-text-tertiary)}.action-bar{display:grid;grid-template-columns:1fr 1fr;gap:var(--sp-2);padding:var(--sp-3) var(--sp-5);background-color:var(--c-surface);border-top:.5px solid var(--c-border-light)}@media (min-width: 1024px){.single-editor{flex-direction:row}.preview-area{flex:1}.control-panel{width:400px;flex-shrink:0;border-top:none;border-left:.5px solid var(--c-border)}.action-bar{grid-template-columns:1fr 1fr}}.multi-canvas{display:block;max-width:100%;max-height:100%;touch-action:none}.grid-template-thumb{width:44px;height:44px;border-radius:2px}.collage-template-list{display:grid;grid-template-columns:repeat(2,1fr);gap:var(--sp-3)}.collage-template-item{display:flex;flex-direction:column;gap:var(--sp-2);padding:var(--sp-3);border:2px solid var(--c-border);border-radius:var(--r-md);cursor:pointer;transition:all var(--t-fast)}.collage-template-item:hover{border-color:var(--c-primary-light)}.collage-template-item.active{border-color:var(--c-accent);background-color:var(--c-overlay-light)}.collage-template-preview{width:100%;aspect-ratio:1;background-color:var(--c-bg);border-radius:var(--r-sm);display:flex;gap:2px;padding:4px;overflow:hidden}.collage-cell{background-color:var(--c-tertiary);border-radius:2px;flex:1}.collage-magazine{flex-direction:row}.collage-magazine .collage-cell:first-child{flex:2}.collage-magazine .collage-cell:nth-child(2),.collage-magazine .collage-cell:nth-child(3){flex:1}.collage-minimal{flex-direction:column;padding:8px;gap:6px}.collage-minimal .collage-cell:first-child{flex:3}.collage-minimal .collage-cell:nth-child(2),.collage-minimal .collage-cell:nth-child(3){flex:1}.collage-polaroid{flex-direction:column;gap:4px;padding:3px}.collage-polaroid .collage-cell{flex:1;border:2px solid var(--c-surface);border-bottom:8px solid var(--c-surface)}.collage-waterfall{flex-direction:row;gap:2px;padding:3px}.collage-waterfall .collage-cell:first-child{flex:1;align-self:flex-start;height:60%}.collage-waterfall .collage-cell:nth-child(2){flex:1;align-self:flex-end;height:80%}.collage-waterfall .collage-cell:nth-child(3){flex:1;align-self:flex-start;height:50%}.collage-template-info{display:flex;flex-direction:column;align-items:center;gap:2px}.collage-template-name{font-size:var(--fs-xs);font-weight:var(--fw-semibold);color:var(--c-text-primary)}.collage-template-desc{font-size:var(--fs-2xs);color:var(--c-text-tertiary)}.multi-editor{display:flex;flex-direction:column;height:100%;overflow:hidden}.image-strip{display:flex;gap:var(--sp-2);padding:var(--sp-2) var(--sp-5);background-color:var(--c-surface);border-top:.5px solid var(--c-border-light);overflow-x:auto;-webkit-overflow-scrolling:touch;flex-shrink:0}.image-strip-item{position:relative;width:44px;height:44px;flex-shrink:0;border-radius:var(--r-sm);overflow:hidden;border:2px solid transparent;cursor:pointer;transition:border-color var(--t-fast)}.image-strip-item.active{border-color:var(--c-accent)}.image-strip-item img{width:100%;height:100%;object-fit:cover}.image-strip-remove{position:absolute;top:-4px;right:-4px;width:16px;height:16px;display:flex;align-items:center;justify-content:center;font-size:9px;background-color:#0009;color:#fff;border-radius:var(--r-full);opacity:0;transition:opacity var(--t-fast)}.image-strip-item:hover .image-strip-remove{opacity:1}.image-strip-add{width:44px;height:44px;flex-shrink:0;display:flex;align-items:center;justify-content:center;border:1.5px dashed var(--c-border);border-radius:var(--r-sm);color:var(--c-text-tertiary);font-size:18px;font-weight:var(--fw-light);cursor:pointer;transition:all var(--t-fast)}.image-strip-add:hover{border-color:var(--c-accent);color:var(--c-accent)}.upload-input{display:none}.empty-state{cursor:pointer;transition:transform var(--t-normal)}.empty-state:hover{transform:scale(1.02)}.empty-state:active{transform:scale(.98)}.action-bar{display:grid;grid-template-columns:1fr 1fr;gap:var(--sp-2)}.action-bar .btn{border-radius:var(--r-lg);font-size:var(--fs-base)}@media (min-width: 1024px){.multi-editor{flex-direction:row}.preview-area{flex:1}.control-panel{width:400px;flex-shrink:0;border-top:none;border-left:.5px solid var(--c-border)}}.header-inner{display:flex;align-items:center;justify-content:space-between;padding:var(--sp-2) var(--sp-5);max-width:1200px;margin:0 auto}.header-title{font-size:var(--fs-lg);font-weight:var(--fw-semibold);color:var(--c-text-primary);letter-spacing:-.022em}.header-nav{display:flex;gap:var(--sp-1)}.nav-link{padding:var(--sp-1) var(--sp-3);font-size:var(--fs-sm);font-weight:var(--fw-medium);color:var(--c-text-secondary);border-radius:var(--r-full);transition:all var(--t-normal);letter-spacing:-.01em}.nav-link:hover{color:var(--c-text-primary);background-color:var(--c-overlay-light)}.nav-link.active{color:var(--c-text-primary);background-color:var(--c-surface-secondary)}.nav-link:active{transform:scale(.96)}@media (min-width: 1024px){.header-inner{padding:var(--sp-3) var(--sp-8)}.header-title{font-size:var(--fs-xl)}.nav-link{padding:var(--sp-2) var(--sp-4);font-size:var(--fs-base)}}