:root{--ink:#17211b;--muted:#6b746e;--lime:#adff5b;--lime-dark:#78c92c;--paper:#f6f7f2;--line:#dde2da}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif}button,input{font:inherit}button{color:inherit}button:focus-visible,input:focus-visible,a:focus-visible{outline:3px solid rgba(120,201,44,.45);outline-offset:3px}.hidden{display:none!important}.topbar{max-width:1240px;margin:auto;padding:24px 28px;display:flex;justify-content:space-between;align-items:center}.brand{color:var(--ink);text-decoration:none;display:flex;align-items:center;gap:10px;font-size:20px;font-weight:800;letter-spacing:-.03em}.brandMark{width:34px;height:34px;display:grid;place-items:center;border-radius:10px;background:var(--ink);color:var(--lime);font-size:16px}.privacyPill{display:flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 14px;color:var(--muted);font-size:13px}.privacyDot{width:8px;height:8px;border-radius:50%;background:#65c119;box-shadow:0 0 0 4px #e5f7d6}.hero{max-width:940px;margin:72px auto 54px;text-align:center;padding:0 28px}.eyebrow{display:inline-flex;border:1px solid #cad2c7;border-radius:999px;padding:7px 13px;font:700 12px/1 system-ui;letter-spacing:.12em;color:#667069}h1{margin:24px 0 20px;font-size:clamp(48px,8vw,92px);line-height:.98;letter-spacing:-.07em;font-weight:850}h1 span{color:var(--lime-dark)}.lead{max-width:650px;margin:auto;color:var(--muted);font-size:18px;line-height:1.75}.workspace{max-width:1240px;margin:0 auto;padding:0 28px}.dropzone{min-height:480px;border:1.5px dashed #bac3b7;border-radius:28px;background:rgba(255,255,255,.7);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px;transition:.2s ease;box-shadow:0 20px 60px rgba(35,53,40,.06)}.dropzone.dragging{border-color:var(--lime-dark);background:#f1ffe5;transform:scale(1.005)}.uploadGlyph{width:72px;height:72px;display:grid;place-items:center;border-radius:22px;background:var(--ink);color:var(--lime);font-size:38px;font-weight:300;margin-bottom:20px}.dropzone h2{margin:0 0 10px;font-size:28px;letter-spacing:-.04em}.dropzone p{margin:0 0 28px;color:var(--muted)}.primaryButton{border:0!important;border-radius:12px!important;padding:13px 22px!important;background:var(--lime)!important;color:#17211b!important;font-weight:800!important;cursor:pointer;box-shadow:inset 0 -2px 0 rgba(52,88,20,.14)}.primaryButton:hover{background:#9cf03f!important}.editorShell{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:0 24px 70px rgba(35,53,40,.1)}.editorTop{min-height:62px;display:flex;justify-content:space-between;align-items:center;padding:0 20px 0 24px;border-bottom:1px solid var(--line);gap:16px}.fileName{font-weight:750;margin-right:12px}.dimensions{color:var(--muted);font-size:12px}.textButton,.clearButton{border:0;background:transparent;color:#647069;font-weight:700;cursor:pointer}.editorBody{min-height:650px;display:grid;grid-template-columns:260px 1fr}.toolbar{padding:24px 20px;border-right:1px solid var(--line);background:#fbfcf9}.stepLabel{font-size:11px;letter-spacing:.08em;color:#687168;font-weight:800;text-transform:uppercase;margin-bottom:14px}.stepLabel span{display:inline-grid;place-items:center;width:25px;height:25px;border-radius:8px;margin-right:8px;background:#e9eee6;color:#566050}.autoButton{width:100%;border:1px solid #ccd5c8;background:#fff;border-radius:13px;padding:13px;display:flex;gap:11px;text-align:left;cursor:pointer}.autoButton:hover{border-color:var(--lime-dark)}.autoButton>b{width:32px;height:32px;display:grid;place-items:center;border-radius:9px;background:var(--lime)}.autoButton>span{display:flex;flex-direction:column;gap:3px}.autoButton strong{font-size:13px}.autoButton small{color:var(--muted);font-size:10px}.toolRow{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:16px;padding:4px;background:#edf0eb;border-radius:10px}.toolRow button{border:0;background:transparent;border-radius:7px;padding:8px;cursor:pointer;font-size:12px;font-weight:700}.toolRow button.active{background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.08)}.rangeLabel{margin-top:20px;display:grid;grid-template-columns:1fr auto;gap:8px;font-size:12px;font-weight:700}.rangeLabel output{color:var(--muted);font-weight:500}.rangeLabel input{grid-column:1/-1;width:100%;accent-color:var(--lime-dark)}.clearButton{width:100%;padding:10px;margin-top:10px;font-size:12px}.clearButton:disabled,button:disabled{opacity:.4;cursor:not-allowed}.divider{height:1px;background:var(--line);margin:22px 0}.repairButton{width:100%;min-height:50px;border:0;border-radius:12px;background:var(--ink);color:#fff;padding:0 16px;font-weight:800;display:flex;align-items:center;justify-content:space-between;cursor:pointer}.repairButton b{color:var(--lime);font-size:20px}.canvasStage{min-width:0;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;background-color:#e8ebe5;background-image:linear-gradient(45deg,#dfe3dc 25%,transparent 25%),linear-gradient(-45deg,#dfe3dc 25%,transparent 25%),linear-gradient(45deg,transparent 75%,#dfe3dc 75%),linear-gradient(-45deg,transparent 75%,#dfe3dc 75%);background-size:20px 20px;background-position:0 0,0 10px,10px -10px,-10px 0;padding:56px 38px 38px;overflow:hidden}.canvasHint{position:absolute;top:16px;left:50%;transform:translateX(-50%);width:max-content;max-width:calc(100% - 30px);background:rgba(23,33,27,.86);color:#fff;border-radius:999px;padding:7px 13px;font-size:11px;z-index:2}.canvasWrap{max-width:100%;max-height:530px;display:flex;box-shadow:0 16px 50px rgba(20,28,22,.2);background:#fff}canvas{display:block;max-width:100%;max-height:530px;width:auto;height:auto;cursor:crosshair;touch-action:none}.compareButton{position:absolute;bottom:18px;border:1px solid rgba(255,255,255,.2);background:rgba(23,33,27,.84);color:#fff;border-radius:999px;padding:9px 15px;font-size:11px;font-weight:700;cursor:pointer}.exportBar{border-top:1px solid var(--line);padding:18px 22px;display:flex;justify-content:space-between;align-items:center;gap:20px}.exportBar>div:first-child{display:flex;flex-direction:column;gap:3px}.exportBar span{color:var(--muted);font-size:12px}.exportActions{display:flex;gap:9px}.exportActions button{border:1px solid var(--line);background:#fff;border-radius:11px;padding:11px 16px;font-weight:750;cursor:pointer}.howItWorks{max-width:1184px;margin:130px auto 100px;padding:0 28px}.sectionIntro{display:grid;grid-template-columns:1fr 2fr;align-items:start;border-top:1px solid #cad1c7;padding-top:28px}.sectionIntro>span{color:var(--lime-dark);font-weight:800;font-size:12px;letter-spacing:.1em}.sectionIntro h2{max-width:650px;margin:0;font-size:clamp(32px,5vw,54px);line-height:1.12;letter-spacing:-.05em}.steps{margin-top:70px;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.steps article{min-height:210px;padding:24px;border-radius:18px;background:#fff;border:1px solid var(--line)}.steps article>span{color:#9aa399;font:700 12px/1 system-ui}.steps h3{margin:55px 0 8px;font-size:20px}.steps p{margin:0;color:var(--muted);line-height:1.6;font-size:14px}footer{max-width:1184px;margin:auto;padding:28px;border-top:1px solid #cad1c7;display:flex;justify-content:space-between;color:var(--muted);font-size:12px}footer p{margin:0}@media(max-width:800px){.privacyPill span:last-child{display:none}.hero{margin-top:45px}.editorBody{grid-template-columns:1fr}.toolbar{border-right:0;border-bottom:1px solid var(--line)}.canvasStage{min-height:460px;padding:58px 18px 42px}.sectionIntro{grid-template-columns:1fr;gap:20px}.steps{grid-template-columns:1fr;gap:10px;margin-top:40px}.steps article{min-height:160px}.steps h3{margin-top:32px}}@media(max-width:520px){.topbar,.workspace,.howItWorks{padding-left:16px;padding-right:16px}h1{font-size:50px}.lead{font-size:15px}.dropzone{min-height:390px;padding:24px}.dropzone p{text-align:center}.editorTop{align-items:flex-start;padding:16px}.dimensions{display:block;margin-top:3px}.exportBar{align-items:stretch;flex-direction:column}.exportActions button{flex:1}footer{flex-direction:column;gap:8px}}
.canvasWrap{position:relative;overflow:hidden}.sourcePreview{position:absolute;inset:0;width:100%;height:100%;object-fit:fill;pointer-events:none;user-select:none}canvas{position:relative;z-index:1}
