:root{--color-paper:#faf9f6;--color-white:#fff;--color-ink:#252b28;--color-muted:#6b736d;--color-coral:#d9493d;--color-border:#e5e6df;--color-mint:#eaf1e7;--color-soft:#f9eae5;color:var(--color-ink);background:var(--color-paper);font-synthesis:none;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Arial,sans-serif}*{box-sizing:border-box}[hidden]{display:none!important}html{scroll-behavior:smooth;scroll-padding-top:28px}body{margin:0}button,input,select{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}a{color:inherit;text-decoration:none}p{color:var(--color-muted);line-height:1.6}h1,h2,h3,p{margin-top:0}h2,h3{font-weight:600}header,main,footer{width:min(1152px,100% - 48px);margin-inline:auto}header{align-items:center;gap:40px;min-height:90px;display:flex}.brand{letter-spacing:-.8px;white-space:nowrap;align-items:center;gap:10px;font-size:23px;font-weight:750;display:inline-flex}.brand-mark{background:var(--color-coral);border-radius:8px;place-items:center;padding:8px;display:grid}.brand-mark img{display:block}header nav{align-items:center;gap:28px;font-size:14px;font-weight:500;display:flex}header nav a:hover,footer a:hover{color:var(--color-coral)}.header-actions{margin-left:auto}.privacy{color:var(--color-muted);white-space:nowrap;font-size:11px}.language-switch{align-items:center;display:flex}.language-switch>span{display:none}.language-switch select{border-color:var(--color-border);background:0 0;max-width:110px;font-size:12px}.hero{text-align:center;flex-direction:column;align-items:center;gap:22px;padding:65px 0 62px;display:flex}.eyebrow{background:var(--color-mint);letter-spacing:.3px;border-radius:8px;padding:12px;font-size:12px;font-weight:500}h1{letter-spacing:-2.72px;margin:0;font-size:clamp(40px,5.2vw,68px);font-weight:650;line-height:1.08}.hero>p{margin:0;font-size:18px;line-height:1.4}.hero-actions{align-items:center;gap:14px;display:flex}.primary,.secondary{border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;gap:12px;padding:15px 24px;font-size:15px;font-weight:600;line-height:1.4;display:inline-flex}.primary{background:var(--color-coral);color:#fff}.primary:hover{background:#bd3a30}.secondary{background:var(--color-white);color:var(--color-ink)}.secondary:hover{border-color:var(--color-border)}.document-demo{width:min(1100px,100%);margin:8px auto 0;line-height:0}.hero-illustration{aspect-ratio:2048/688;object-fit:contain;width:100%;height:auto;display:block;-webkit-mask-image:linear-gradient(#0000,#000 8% 92%,#0000),linear-gradient(90deg,#0000,#000 5% 95%,#0000);mask-image:linear-gradient(#0000,#000 8% 92%,#0000),linear-gradient(90deg,#0000,#000 5% 95%,#0000);-webkit-mask-composite:source-in;mask-composite:intersect}#catalog{padding:40px 0 72px;scroll-margin-top:24px}.section-title{justify-content:space-between;align-items:center;gap:18px;margin-bottom:26px;display:flex}.section-title h2{letter-spacing:-.8px;margin:0;font-size:32px;line-height:1.3}.section-title>span{color:var(--color-muted);font-size:13px}.tool-search{border:1px solid var(--color-border);background:#fff;border-radius:10px;align-items:center;gap:14px;margin-bottom:26px;padding:18px;display:flex}.tool-search input{width:100%;min-width:0;color:var(--color-ink);background:0 0;font-size:16px;border:0!important;border-radius:0!important;padding:0!important}.tool-search:focus-within{outline:2px solid var(--color-coral);outline-offset:3px}.tool-search input:focus-visible{outline:none}.categories{flex-wrap:wrap;gap:12px;margin-bottom:26px;display:flex}.category{color:var(--color-muted);background:0 0;border:0;border-radius:8px;padding:12px;font-size:14px;font-weight:500}.category.active{background:var(--color-ink);color:#fff}.category:not(.active):hover{background:var(--color-mint)}.grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;display:grid}.tool{text-align:left;border:1px solid var(--color-border);min-height:220px;color:inherit;background:#fff;border-radius:12px;flex-direction:column;align-items:flex-start;gap:14px;padding:26px;transition:transform .18s,border-color .18s,box-shadow .18s;display:flex}.tool:hover{border-color:#dba89e;transform:translateY(-3px);box-shadow:0 8px 24px #252b2808}.tool .icon{background:var(--color-soft);border-radius:10px;padding:10px;display:inline-flex}.tool .icon img{display:block}.tool h3{letter-spacing:-.4px;margin:0;font-size:21px;line-height:1.4}.tool p{margin:0;font-size:14px;line-height:1.4}.tool-link{color:var(--color-coral);margin-top:auto;font-size:13px;font-weight:600}.benefits{background:var(--color-mint);box-shadow:0 0 0 100vmax var(--color-mint);clip-path:inset(0 -100vmax);grid-template-columns:1.5fr repeat(3,1fr);gap:40px;padding:50px 0;display:grid}.benefits h2{letter-spacing:-.8px;margin:0;font-size:32px;line-height:1.4}.benefits h3{margin:0 0 10px;font-size:17px}.benefits p{margin:0;font-size:14px}.faq{max-width:880px;margin:auto;padding:68px 0}.faq h2{letter-spacing:-.7px;margin-bottom:22px;font-size:30px;line-height:1.4}.faq details{border-top:1px solid var(--color-border);padding:22px 0}.faq summary{justify-content:space-between;align-items:center;gap:20px;font-size:16px;font-weight:500;list-style:none;display:flex}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";color:var(--color-muted);font-size:22px;font-weight:400}.faq details[open] summary:after{content:"−"}.faq details p{max-width:740px;margin:16px 0 0;font-size:14px}footer{clip-path:inset(0 -100vmax);background:#fff;padding:36px 0;box-shadow:0 0 0 100vmax #fff}.footer-row{align-items:center;gap:36px;display:flex}.footer-row>span{color:var(--color-muted);margin-right:auto;font-size:14px}.footer-row>a:not(.brand){color:var(--color-muted);font-size:13px}.copyright{border-top:1px solid var(--color-border);color:var(--color-muted);flex-wrap:wrap;gap:12px;margin-top:26px;padding-top:26px;font-size:12px;display:flex}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--color-coral);outline-offset:4px}#workspace{border:1px solid var(--color-border);background:#fff;border-radius:16px;margin:0 0 60px;padding:28px;scroll-margin-top:24px}#workspace .section-title h2{font-size:28px}fieldset{border:0;min-width:0;padding:0}.drop{background:var(--color-paper);text-align:center;border:2px dashed #dba89e;border-radius:12px;flex-direction:column;align-items:center;gap:14px;padding:36px 16px;display:flex}.drop.over{background:var(--color-soft);border-color:var(--color-coral)}input[type=file]{max-width:100%}small{color:var(--color-muted);font-size:12px}#options{flex-wrap:wrap;gap:18px;margin:20px 0;display:flex}#options label{flex-direction:column;gap:8px;font-size:13px;display:flex}input:not([type=file]),select{border:1px solid var(--color-border);color:var(--color-ink);background:#fff;border-radius:7px;padding:10px}input[type=number]{width:100px}button:disabled{opacity:.5;cursor:wait}li{overflow-wrap:anywhere;padding:8px}li button{background:var(--color-mint);border:0;border-radius:4px;margin-left:8px;padding:4px 8px}#status.error{color:#b42318}#result a{background:var(--color-coral);color:#fff;border-radius:8px;padding:14px 20px;display:inline-block}#signature{border:1px solid var(--color-border);touch-action:none;background:#fff;border-radius:8px;max-width:100%}#options .wide{width:100%}html[lang=zh-CN] h1{letter-spacing:-1.5px;line-height:1.2}html[lang=zh-CN] .eyebrow{letter-spacing:2px}@media (width>=1500px){.hero{padding-top:80px}}@media (width<=1100px){header{gap:22px}header nav{gap:20px}.privacy{display:none}.benefits{gap:24px}.footer-row{gap:22px}}@media (width<=760px){header,main,footer{width:calc(100% - 40px)}header{gap:16px;min-height:76px}.brand{font-size:22px}header nav,.header-actions{display:none}.language-switch{margin-left:auto}.hero{gap:22px;padding:42px 4px}h1{letter-spacing:-1.7px;font-size:42px}.hero>p{font-size:15px}.eyebrow{padding:10px;font-size:10px}.hero-actions{flex-direction:column;gap:6px}.hero-actions .secondary{background:0 0;font-size:14px}.document-demo{display:none}#catalog{padding:22px 4px 42px}.section-title{align-items:flex-start;margin-bottom:22px}.section-title h2{max-width:250px;font-size:28px}.section-title>span{display:none}.tool-search{margin-bottom:16px;padding:16px}.tool-search input{font-size:14px}.categories{gap:8px;margin-bottom:16px}.category{padding:11px 12px;font-size:13px}.grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.tool{min-height:220px;padding:22px}.tool h3{font-size:20px}.benefits{grid-template-columns:1fr;gap:24px;padding:32px 4px}.benefits h2{font-size:30px}.benefits h3{margin-bottom:6px}.faq{padding:42px 4px}.faq h2{font-size:26px}.faq summary{font-size:15px}.footer-row{flex-wrap:wrap;gap:20px}.footer-row>span{order:1;width:100%}.copyright{font-size:11px}footer{padding:28px 4px}#workspace{padding:20px}#workspace .section-title{align-items:center}#workspace .section-title h2{font-size:24px}.primary,.secondary{font-size:14px}html[lang=zh-CN] h1{font-size:40px}}@media (width<=480px){.grid{grid-template-columns:1fr}.tool{min-height:220px;padding:26px}.hero>p{max-width:100%}h1{font-size:40px}.categories{gap:3px}.category{padding:11px}.section-title h2{max-width:290px}.faq h2{font-size:25px}#options input[type=text]{width:100%;min-width:0}#options label{max-width:100%}.drop{font-size:14px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}.tool{transition:none}.tool:hover{transform:none}}.signature-preview{border:1px solid var(--color-border);background:var(--color-paper);border-radius:12px;min-width:0;overflow:hidden}.signature-preview-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:18px 20px 0;display:flex}.signature-preview-header h3{margin:0;font-size:18px}.signature-page-navigation{flex-wrap:wrap;align-items:center;gap:12px;font-size:13px;display:flex}.signature-page-navigation .secondary{border-color:var(--color-border);padding:9px 12px;font-size:13px}.signature-preview>p{overflow-wrap:anywhere;margin:12px 20px;font-size:13px}#sign-preview-status.error{color:#b42318}.signature-preview-surface{background:#e9e8e2;justify-content:center;padding:24px;display:flex;overflow:hidden}#sign-page-stage{background:#fff;flex-shrink:1;max-width:100%;line-height:0;position:relative;box-shadow:0 4px 18px #252b281c}#sign-page-canvas{width:100%;height:100%;display:block;position:absolute;inset:0}#sign-overlay{outline:2px dashed var(--color-coral);outline-offset:0;cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;background:#d9493d08;border:0;border-radius:2px;margin:0;padding:0;line-height:0;position:absolute}#sign-overlay:active{cursor:grabbing}#sign-overlay:focus-visible{outline:3px solid var(--color-coral);outline-offset:2px}#sign-overlay canvas{pointer-events:none;width:100%;height:100%;display:block}#signature{width:600px;height:auto;display:block}@media (width<=760px){.signature-preview-header{padding:14px 12px 0}.signature-preview>p{margin:12px}.signature-page-navigation{gap:8px}.signature-preview-surface{padding:14px}.signature-page-navigation .secondary{padding:9px}}.page-organizer{border-top:1px solid var(--color-border);min-width:0;padding-top:20px}.organizer-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;margin-bottom:12px;display:flex}.organizer-header h3{margin:0;font-size:18px}.organizer-toolbar{flex-wrap:wrap;gap:8px;display:flex}.organizer-toolbar .secondary{border-color:var(--color-border);padding:9px 12px;font-size:13px}.page-organizer>p{margin-bottom:12px;font-size:13px}#organize-status.error{color:#b42318}.page-thumbnails{grid-template-columns:repeat(auto-fill,minmax(min(170px,100%),1fr));gap:14px;margin:16px 0 0;padding:0;list-style:none;display:grid}.page-card{border:1px solid var(--color-border);background:var(--color-paper);border-radius:10px;min-width:0;padding:10px}.page-card-heading{color:var(--color-ink);margin:0 0 8px;font-size:12px}.page-thumbnail{cursor:grab;background:#e9e8e2;border-radius:5px;justify-content:center;align-items:center;height:180px;display:flex;overflow:hidden}.page-thumbnail img{object-fit:contain;max-width:100%;max-height:100%;display:block;box-shadow:0 2px 6px #252b2820}.page-thumbnail>span{color:var(--color-muted);text-align:center;padding:12px;font-size:12px;line-height:1.6}.page-card-actions{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin-top:10px;display:grid}.page-card-actions button{border:1px solid var(--color-border);background:#fff;border-radius:5px;min-width:0;margin:0;padding:8px 4px;font-size:12px;line-height:1.4}.page-card-actions button:hover:not(:disabled){background:var(--color-mint)}.page-card-actions button[data-action=remove]{color:#b42318}.page-card-actions button:disabled,.organizer-toolbar button:disabled{cursor:not-allowed}.page-card.dragging{opacity:.5}.page-card.drop-target{outline:3px solid var(--color-coral);outline-offset:2px}.page-thumbnails.invalid-order{opacity:.5}.page-thumbnails.invalid-order .page-thumbnail{cursor:default}.watermark-preview{border:1px solid var(--color-border);background:var(--color-paper);border-radius:12px;min-width:0;padding:18px}.watermark-preview h3{margin-bottom:12px;font-size:18px}.watermark-preview p{margin:12px 0 0;font-size:13px}.watermark-sample{border:1px dashed var(--color-border);background:#fff;border-radius:8px;justify-content:center;align-items:center;min-height:110px;margin-top:16px;padding:16px;display:flex;overflow:hidden}#watermark-sample{object-fit:contain;opacity:.3;max-width:100%;max-height:70px;display:block}#watermark-preview-status.error{color:#b42318}.processing-actions{flex-wrap:wrap;align-items:center;gap:12px;display:flex}#cancel{border-color:var(--color-border)}.quick-start{padding-bottom:0}.quick-start ol{padding-left:24px;font-size:14px;line-height:1.6}.quick-start a{color:var(--color-coral);text-underline-offset:3px;text-decoration:underline}.feedback{background:var(--color-mint);border-radius:12px;max-width:880px;margin:32px auto 0;padding:28px;scroll-margin-top:24px}.feedback h2{margin:0 0 12px;font-size:26px}.feedback p,.feedback li{font-size:14px;line-height:1.6}.feedback ul{padding-left:22px}.feedback .primary{margin-top:8px;display:inline-flex}.feedback .feedback-note{color:var(--color-muted);overflow-wrap:anywhere;font-size:12px}.feedback .feedback-address{color:inherit;overflow-wrap:anywhere}@media (width<=480px){.feedback{padding:20px}.feedback h2{font-size:24px}}.split-result{border-top:1px solid var(--color-border);margin-top:16px;padding-top:12px}.split-result a{margin:0 10px 8px 0}.split-result p{overflow-wrap:anywhere}.output-preview{border-top:1px solid var(--color-border);padding-top:18px}.output-preview label{margin-right:12px;display:inline-flex!important}.output-preview canvas{border:1px solid var(--color-border);max-width:100%;height:auto;margin-top:12px}.output-preview button{margin-top:12px}.signature-input{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.signature-input>p,.signature-input>canvas{flex-basis:100%}.signature-input>canvas{object-fit:contain;max-width:100%;max-height:300px;width:auto!important}.signature-zoom{margin:12px 20px}.signature-preview-surface{overflow:auto}#sign-kept-overlays{pointer-events:none;position:absolute;inset:0}#sign-kept-overlays img{height:auto;position:absolute}#signature-placements li{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.continue-result{flex-wrap:wrap;align-items:end;gap:12px;margin:12px 0 22px;display:flex}.continue-result label{flex-direction:column;gap:6px;font-size:13px;display:flex}.continue-result select{max-width:100%}#file-list small{margin:6px 0;display:block}#tool-guide{padding:24px 0 40px}#workspace:not([hidden]){margin-top:28px}