@charset "UTF-8";
:root{color-scheme:light;--bg:#f5f6f8;--white:#fff;--ink:#18232e;--muted:#66717e;--line:#dfe3e8;--accent:#d94420;--orange:#ef542f;--tint:#fff2ec;--radius:20px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.45;cursor:wait}a{color:inherit}button{border:0}button:focus-visible,a:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #245cc3;outline-offset:4px}[hidden]{display:none!important}.header{max-width:1160px;margin:auto;min-height:100px;padding:24px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:21px;font-weight:750;line-height:1.4}.brand small{display:block;font-size:10px;letter-spacing:2px;font-weight:600;color:var(--muted);margin-top:3px}.brand-mark{background:var(--orange);color:white;border-radius:13px;width:44px;height:44px;display:grid;place-items:center;font-size:27px}.byline{font-size:14px;color:var(--muted)}main{max-width:1160px;margin:auto;padding:30px 24px 40px}.heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.eyebrow{color:var(--accent);font-size:14px;margin:0 0 6px;font-weight:650;letter-spacing:1px}h1{font-size:clamp(24px,3.2vw,36px);line-height:1.4;margin:0;font-weight:750;letter-spacing:-.7px}h2{font-size:20px;margin:0;line-height:1.5}.privacy{font-size:14px;padding:8px 13px;border:1px solid var(--line);border-radius:30px;white-space:nowrap}.steps{display:flex;list-style:none;padding:0;margin:27px 0 24px;gap:8px}.steps li{flex:1;color:var(--muted);font-size:14px;border-top:2px solid var(--line);padding-top:10px}.steps li b{font-size:12px;margin-right:6px;font-variant-numeric:tabular-nums}.steps .active{color:var(--accent);border-color:var(--orange)}.upload-area{min-height:365px;background:var(--white);border:1px dashed #b8c1cb;border-radius:var(--radius);text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 16px}.upload-area.dragover{background:var(--tint);border-color:var(--orange)}.upload-icon{width:68px;height:68px;background:var(--tint);color:var(--accent);border-radius:20px;display:grid;place-items:center;margin-bottom:16px}.upload-icon svg{width:39px;height:39px}.upload-area h2{font-size:24px}.upload-area p{color:var(--muted);margin:7px 0 21px}.primary,.secondary{border-radius:12px;min-height:48px;padding:11px 19px;display:inline-flex;align-items:center;justify-content:center;gap:24px;text-decoration:none;font-weight:650;font-size:16px}.primary{background:var(--accent);color:white}.primary:hover{background:#be3818}.secondary{background:white;color:var(--ink);border:1px solid var(--line);font-size:14px;gap:8px}.secondary:hover{background:var(--bg)}.text-btn{background:transparent;color:var(--accent);padding:10px 4px;min-height:44px;font-size:14px;white-space:nowrap}.subtle{font-size:13px;color:var(--muted);line-height:1.7}.upload-area .subtle{font-size:13px;margin:20px 0 0}.workspace-layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(300px,1fr);gap:24px;align-items:start}.editor-panel,.settings-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--white);overflow:hidden}.panel-top{display:flex;justify-content:space-between;align-items:center;padding:20px 22px}.panel-top p{margin:3px 0 0;overflow-wrap:anywhere}.editor-surround{padding:22px;background:#25313c;background-image:linear-gradient(45deg,#2c3843 25%,transparent 25%),linear-gradient(-45deg,#2c3843 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#2c3843 75%),linear-gradient(-45deg,transparent 75%,#2c3843 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0}.editor{position:relative;width:100%;margin:auto;line-height:0;user-select:none;-webkit-user-select:none}.editor img{display:block;width:100%;height:auto;pointer-events:none}.cut-overlay{position:absolute;inset:0;pointer-events:none;overflow:visible}.cut{position:absolute;background:transparent;padding:0;pointer-events:auto;touch-action:none;z-index:2;color:white}.cut.x{height:100%;width:32px;top:0;transform:translateX(-50%);cursor:ew-resize}.cut.y{width:100%;height:32px;left:0;transform:translateY(-50%);cursor:ns-resize}.cut::before{content:"";display:block;position:absolute;box-shadow:0 0 0 1px #fff9}.cut.x::before{left:15px;top:0;height:100%;border-left:2px dashed var(--orange)}.cut.y::before{top:15px;left:0;width:100%;border-top:2px dashed var(--orange)}.cut span{position:absolute;background:var(--orange);border:2px solid white;border-radius:7px;box-shadow:0 2px 6px #0003;font-size:13px;line-height:26px;height:30px;min-width:30px;text-align:center}.cut.x span{top:-15px;left:1px}.cut.y span{left:-15px;top:1px}.cut.selected{z-index:5}.cut.selected span{background:var(--ink)}.gutter{position:absolute;background:#ef542f55;pointer-events:none}.tile-number{position:absolute;transform:translate(-50%,-50%);background:#17212dd9;color:white;border:1px solid #ffffff88;border-radius:5px;padding:3px 5px;line-height:1.2;font-size:12px;font-variant-numeric:tabular-nums}.editor-tip{font-size:13px;color:var(--muted);margin:13px 20px 16px}.fine-tune{display:flex;gap:10px;align-items:center;padding:0 20px 18px;font-size:14px;flex-wrap:wrap}.fine-tune>span:first-child{margin-right:auto}.fine-tune button{width:40px;height:40px;border-radius:8px;background:var(--bg)}.fine-tune input{width:82px;min-height:40px;border:1px solid var(--line);border-radius:8px;padding:5px;font-variant-numeric:tabular-nums;text-align:center}.settings-panel{padding:22px}.setting-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:17px}.tag{background:var(--bg);font-size:13px;border-radius:6px;padding:2px 8px}.presets{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.preset{border:1px solid var(--line);background:white;border-radius:12px;padding:13px 5px;color:var(--ink);display:flex;flex-direction:column;align-items:center;gap:5px}.preset.selected{border-color:var(--orange);background:var(--tint);box-shadow:0 0 0 1px var(--orange)}.preset b{font-size:14px}.preset small{font-size:12px;color:var(--muted)}.mini-grid{width:30px;height:30px;border:1.5px solid currentColor;border-radius:3px;color:#6b7681;margin-bottom:3px;background-image:linear-gradient(to right,transparent calc(100% - 1px),currentColor 0),linear-gradient(to bottom,transparent calc(100% - 1px),currentColor 0);background-size:33.333% 33.333%}.g4{background-size:33.333% 25%}.g2{background-size:50% 50%}.selected .mini-grid{color:var(--accent)}.algorithm-actions{display:flex;gap:14px;align-items:center;margin-top:18px}.algorithm-actions .secondary{flex:1}.detection-info{font-size:14px;color:var(--muted);margin:12px 0 20px;line-height:1.7}.check-row{display:flex;gap:10px;border-top:1px solid var(--line);padding:18px 0;font-size:14px;align-items:flex-start}.check-row input{accent-color:var(--accent);width:18px;height:18px;margin:3px 0 0;flex-shrink:0}.check-row small{display:block;color:var(--muted);font-size:12px;margin-top:3px}.advanced{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:20px}.advanced summary{font-size:14px;padding:14px 0;cursor:pointer;list-style:none;display:flex;justify-content:space-between}.advanced summary::-webkit-details-marker{display:none}.advanced-body{padding:3px 0 8px}.custom-grid{display:flex;align-items:end;gap:8px}.custom-grid label{flex:1;min-width:0;font-size:14px}.custom-grid input{width:100%;display:block;padding:7px;border-radius:7px;border:1px solid var(--line);margin-top:5px}.custom-grid>span{padding-bottom:8px}.custom-grid button{min-height:43px;padding:7px 12px}.format-label{display:block;font-size:14px;margin-top:16px}.format-label select{display:block;width:100%;background:white;margin-top:6px;padding:10px 6px;border:1px solid var(--line);border-radius:8px}.split-btn{width:100%;justify-content:space-between}.local-note{color:var(--muted);text-align:center;font-size:12px;margin:9px 0 0}.notice{padding:14px 17px;border-radius:12px;background:#fff0de;color:#71420b;border:1px solid #f4d7b1;font-size:14px;overflow-wrap:anywhere}.results{padding-top:36px;scroll-margin-top:20px}.results-heading{display:flex;align-items:center;justify-content:space-between;gap:16px}.results-heading h2{font-size:26px}.results-heading p.subtle{margin:5px 0}.save-help{display:flex;gap:18px;background:#e9eef5;border:1px solid #d9e2ed;border-radius:12px;font-size:14px;padding:15px 18px;margin:20px 0;color:#42556c}.save-help b{white-space:nowrap}.result-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.result-card{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:white}.result-image{display:block;padding:0;background:#e8ebef;width:100%;line-height:0}.result-image img{display:block;width:100%;height:auto}.card-info{padding:13px 14px;display:flex;align-items:center;justify-content:space-between;gap:8px}.card-info b{font-size:14px}.card-info small{display:block;font-size:12px;color:var(--muted)}.card-info button{padding:9px 14px;border-radius:9px;background:var(--tint);color:var(--accent);font-size:14px;min-height:44px;white-space:nowrap}.back-btn{display:flex;margin:25px auto 0}.help{margin-top:30px;color:var(--muted);font-size:14px;max-width:780px}.help summary{cursor:pointer;padding:8px 0}.help p{margin:8px 0}.help p:last-child{margin-bottom:0}footer{max-width:1160px;margin:0 auto;padding:22px 24px 32px;display:flex;justify-content:space-between;gap:15px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.image-dialog{padding:20px;border:0;border-radius:18px;max-width:760px;width:calc(100% - 24px);max-height:94dvh;background:white;color:var(--ink);overflow:auto}.image-dialog::backdrop{background:#101b2dd9}.dialog-top{display:flex;justify-content:space-between;align-items:center}.dialog-top button{background:var(--bg);border-radius:100%;width:44px;height:44px}.image-dialog p{font-size:14px;color:var(--muted);margin:2px 0 16px}.image-dialog>img{width:100%;height:auto;display:block;-webkit-touch-callout:default;user-select:auto}.dialog-actions{display:flex;gap:10px;position:sticky;bottom:-20px;background:white;padding:15px 0}.dialog-actions>*{flex:1;font-size:14px;gap:8px}body.busy .settings-panel{pointer-events:none}body.busy .cut{pointer-events:none}@media(min-width:800px){.editor{max-width:550px}.settings-panel{position:sticky;top:20px}}@media(max-width:799px){.header{min-height:82px;padding:18px 20px}.brand{font-size:19px}.brand small{font-size:9px}.brand-mark{width:40px;height:40px}main{padding:24px 16px 30px}.heading{display:block}.privacy{display:inline-block;padding:3px 0;border:0;margin-top:8px;font-size:13px}.eyebrow{font-size:13px}.steps{margin:18px 0}.steps li{font-size:13px}.workspace-layout{grid-template-columns:1fr;gap:16px}.settings-panel{padding:20px}.panel-top{padding:15px 18px}.editor-surround{padding:23px}.upload-area{min-height:340px}.upload-area h2{font-size:22px}.upload-area>p{font-size:14px}.result-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.results-heading{display:block}.results-heading .primary{width:100%;margin-top:13px}.save-help{display:block;padding:14px}.save-help b{display:block;margin-bottom:4px}.results-heading h2{font-size:24px}.card-info{padding:10px;flex-wrap:wrap}.card-info button{width:100%;padding:8px}.results{padding-top:28px}.help{margin-top:24px}footer{padding:18px 16px 30px}.fine-tune{gap:7px}.fine-tune input{width:72px}.fine-tune>span:first-child{flex-basis:100%}.byline{font-size:12px}}@media(prefers-reduced-motion:no-preference){button{transition:background .15s,border-color .15s}html{scroll-behavior:smooth}}@media(max-width:350px){.result-grid{grid-template-columns:1fr}.byline{display:none}.primary{gap:8px}.preset b{font-size:13px}} 

/* A single optional placement stays outside the editor and save controls. */
.g4x4{background-size:25% 25%}.g5x5{background-size:20% 20%}.g1x3{background-size:33.333% 100%}
.page-layout{max-width:1480px;margin:auto}.page-layout main{width:100%;min-width:0}
.sponsor-slot{margin:0 24px 32px;padding:18px;background:var(--white);border:1px solid var(--line);border-radius:16px;align-self:start;overflow-wrap:anywhere}
.sponsor-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--muted);font-size:12px;margin-bottom:14px}
.sponsor-heading button{flex-shrink:0;width:44px;height:44px;background:var(--bg);border-radius:50%;font-size:22px;color:var(--muted)}
.sponsor-slot>a{display:block;text-decoration:none}.sponsor-slot strong{font-size:18px}.sponsor-slot p{font-size:14px;color:var(--muted)}.sponsor-action{display:inline-block;color:var(--accent);font-size:14px;padding:10px 0}
@media(min-width:1280px){.page-layout.has-ad{display:grid;grid-template-columns:minmax(0,1fr) 288px}.sponsor-slot{margin:30px 24px 32px 0}}
@media(max-width:799px){.sponsor-slot{margin:0 16px 24px}footer{flex-wrap:wrap}body{padding-bottom:env(safe-area-inset-bottom)}}