:root{color-scheme:light;--paper:#fff;--bg:#f8f9fb;--ink:#202b3d;--muted:#727e90;--rule:#e5e9ef;--accent:#3766dc;--soft:#edf2ff;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}button,input,textarea,select{font:inherit}button,.button,select{cursor:pointer}button,.button{border:1px solid #dce2ec;border-radius:7px;background:var(--paper);color:var(--ink);padding:10px 18px;font-size:14px;font-weight:550}button:hover,.button:hover{background:var(--soft);border-color:#b7c7ef}button:disabled{opacity:.45;cursor:default}.primary{background:var(--accent);border-color:var(--accent);color:white}.primary:hover{background:#2955c3;color:white}.quiet{border-color:transparent;background:transparent;color:var(--muted);padding:7px 10px;font-size:13px}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #9ab7ff;outline-offset:3px}.skip{position:absolute;top:-80px}.skip:focus{top:10px;background:white;z-index:5;padding:10px}header{background:#fffffff0;border-bottom:1px solid var(--rule)}nav{max-width:1120px;margin:auto;padding:0 28px;min-height:76px;display:flex;align-items:center;gap:35px}.brand{font-size:23px;font-weight:750;letter-spacing:-1px;display:inline-flex;align-items:center;white-space:nowrap}.brand-domain{color:var(--muted);font-weight:450}.brand-icon{font:700 14px ui-monospace,monospace;letter-spacing:-1px;display:grid;place-items:center;width:33px;height:33px;background:var(--accent);color:#fff;border-radius:9px;margin-right:10px}.nav-links{display:flex;gap:27px;margin-left:auto;font-size:13px;color:var(--muted)}.nav-links a[aria-current]{color:var(--accent)}select{border:1px solid var(--rule);padding:8px 10px;border-radius:6px;background:white;color:var(--ink);max-width:100%}#language{font-size:12px;max-width:125px}main{max-width:960px;margin:auto;padding:0 24px}.hero{padding:57px 0 32px}.eyebrow{font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.5px;display:flex;align-items:center;gap:7px}.eyebrow span{width:6px;height:6px;border-radius:50%;background:#439c7c}.hero h1{font-size:clamp(28px,4vw,40px);letter-spacing:-1.5px;line-height:1.25;margin:16px 0 12px;font-weight:700}.hero p{color:var(--muted);font-size:14px;line-height:1.7;margin:0;max-width:760px}.converter{border:1px solid var(--rule);border-radius:12px;background:var(--paper);box-shadow:0 4px 18px #263f7310;overflow:hidden}.editor-head{display:flex;gap:12px;align-items:center;padding:14px 22px 8px;font-size:13px;font-weight:600}.editor-head 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13px;font-size:11px;color:var(--muted);flex-wrap:wrap}#status{margin-right:auto;padding-left:7px;flex:1;min-width:140px}#status.error{color:#bd3245}input[type=checkbox]{accent-color:var(--accent);vertical-align:middle}.image-panel{margin:20px 0;background:white;border:1px dashed #ced6e3;border-radius:10px;padding:22px;display:flex;align-items:center;gap:16px;position:relative}.image-panel.dragover{background:var(--soft);border-color:var(--accent)}.image-icon{height:42px;width:42px;display:grid;place-items:center;color:var(--accent);font-size:26px;background:var(--soft);border-radius:9px;flex-shrink:0}.image-panel h2{font-size:14px;margin:0 0 6px}.image-panel p{font-size:12px;color:var(--muted);margin:0}.image-panel input{font-size:11px;max-width:225px;margin-left:auto}input::file-selector-button{background:#f5f7fb;border:1px solid var(--rule);border-radius:5px;padding:8px;cursor:pointer;color:var(--ink)}details.settings,details.examples{border:1px solid var(--rule);border-radius:9px;background:white;margin:12px 0}summary{cursor:pointer;list-style:none;font-size:13px;font-weight:550;padding:17px 21px;display:flex;justify-content:space-between;gap:15px}summary::-webkit-details-marker{display:none}summary span{color:#98a2b3}details[open]>summary{border-bottom:1px solid var(--rule)}.settings-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;padding:23px}.setting{display:flex;flex-direction:column;gap:9px;font-size:12px;color:var(--muted)}.setting select{font-size:13px;color:var(--ink)}.check{font-size:12px;display:flex;align-items:center;gap:5px}.replace{grid-column:1/-1;border:1px solid var(--rule);border-radius:6px;padding:15px;display:flex;gap:18px;flex-wrap:wrap;font-size:13px}.replace legend{font-size:12px;padding:0 6px}.replace input[type=text]{width:46px;border:1px solid var(--rule);padding:5px;border-radius:3px}.replace .check{flex-basis:100%}.examples h3,.examples pre{margin:20px}pre{background:#f4f6fa;border:1px solid var(--rule);border-radius:7px;padding:18px;overflow:auto;font:12px/1.8 ui-monospace,monospace}.examples h3{font-size:13px}.faq-section{padding:44px 0 58px}.section-label{font:10px ui-monospace,monospace;letter-spacing:2px;color:var(--muted)}.faq-section h2{font-size:24px;letter-spacing:-.6px;margin:12px 0 23px}.faq-section details{border-bottom:1px solid var(--rule)}.faq-section summary{padding:18px 0}.faq-section details[open]>summary{border:0}.faq-section p{font-size:14px;line-height:1.8;color:var(--muted);margin:0 0 20px;max-width:800px}footer{max-width:1120px;margin:auto;border-top:1px solid var(--rule);padding:26px 28px;display:flex;align-items:center;gap:24px;color:var(--muted)}footer .brand{font-size:17px;color:var(--ink)}footer div{display:flex;gap:22px;font-size:11px;margin-left:auto}footer p{font-size:10px}.article{background:white;border:1px solid var(--rule);border-radius:12px;padding:40px;margin:45px 0 65px}.article h1{font-size:32px;letter-spacing:-1px;margin:22px 0}.article h2{font-size:20px;margin:30px 0 12px}.article h3{font-size:15px}.article p{line-height:1.9;font-size:15px;color:#5d6b80}.back{color:var(--accent);font-size:13px}.article .button{display:inline-block;margin-top:25px}.files:empty{display:none}.file-row{padding:15px;border:1px solid var(--rule);border-radius:8px;margin:10px 0;display:flex;align-items:center;gap:12px;background:white;flex-wrap:wrap}.file-row span{flex:1;overflow-wrap:anywhere;min-width:100px;font-size:12px}.file-row textarea{min-height:70px;max-height:140px;border:1px solid var(--rule);font-size:11px;flex-basis:100%}#share-note{padding:0 22px 20px;font-size:12px;color:var(--muted)}#share-url{width:100%;padding:10px;border:1px solid var(--rule);border-radius:5px} @media(max-width:680px){nav{padding:14px 18px;gap:12px;flex-wrap:wrap}.brand{font-size:20px}#language{margin-left:auto}.nav-links{order:3;width:100%;margin:0;gap:23px;overflow:auto;font-size:12px;padding-top:10px}main{padding:0 16px}.hero{padding:35px 0 25px}.hero h1{letter-spacing:-.7px}.hero p{font-size:13px}.editor-head{padding-left:16px;padding-right:16px}textarea{padding-left:16px;padding-right:16px}.actions{padding:10px 16px 16px;gap:7px}.key-hint{display:none}.result-head{flex-wrap:wrap}.result-head .check{font-size:10px}.image-panel{flex-wrap:wrap;padding:17px}.image-panel>div:nth-child(2){flex:1}.image-panel input{margin-left:0;max-width:100%;width:100%}.settings-grid{grid-template-columns:1fr}.replace{grid-column:auto}.result-actions{gap:0}.result-actions #status{flex-basis:100%;margin-bottom:5px}.article{padding:24px;margin-top:25px}.article h1{font-size:27px}footer{flex-wrap:wrap;padding:23px 18px;gap:18px}footer div{margin-left:0;flex-wrap:wrap;gap:15px}footer p{margin:0;width:100%}}
/* Historical presentation: compact dark navigation, neutral canvas, white tool sheet. */
:root{--bg:#f5f5f5;--ink:#333;--muted:#777;--rule:#e5e5e5;--accent:#337ab7;--soft:#eef5fa;font-family:"PingFang SC","Helvetica Neue",Helvetica,"Microsoft YaHei",Arial,sans-serif}
header{background:#333;border:0}header nav{min-height:50px;max-width:1000px;gap:20px}header .brand{display:none}.nav-links{margin:0 auto;gap:0;font-size:16px}.nav-links a{color:#eee;padding:15px 20px}.nav-links a[aria-current],.nav-links a:hover{background:#444;color:#fff}#language{background:#fff;font-size:12px}main{max-width:950px;margin:30px auto 20px;padding:19px 29px 29px;background:#fff;border:1px solid #e5e5e5;border-radius:5px;box-shadow:0 1px 2px #0000000d}.hero{padding:0 0 18px}.hero h1{font-size:24px;letter-spacing:0;font-weight:500;line-height:1.6;margin:0 0 8px}.legacy-brand{display:inline-block;background:#5cb85c;color:#fff;border-radius:4px;padding:2px 7px;font-size:14px;font-weight:600;margin-right:8px;vertical-align:middle}.hero p{font-size:13px;line-height:1.7}.language-list{display:flex;flex-wrap:wrap;gap:8px 14px;margin-top:16px;padding:12px 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);font-size:13px;color:#337ab7}.converter{box-shadow:none;border-radius:4px}.editor-head{padding:12px 12px 4px}textarea{padding:10px 12px;min-height:150px;font-size:14px}.actions{padding:10px 12px;gap:7px}.actions button{padding:7px 14px;border-radius:4px;font-weight:400}.actions button span{margin-left:8px}.result-head,#result,.result-actions{background:white}.image-panel{border-radius:4px;margin:18px 0;padding:15px}.image-icon{display:none}.image-panel p{line-height:1.6}.settings,.examples{box-shadow:none}.faq-section{padding:25px 0 5px}.faq-section h2{font-size:21px;letter-spacing:0}.article{margin:0;padding:0;border:0;border-radius:0}.article h1{font-size:24px;letter-spacing:0;font-weight:500;margin:20px 0}.article h2{font-size:19px;font-weight:500;line-height:1.6}.article p{color:#444;font-size:14px;line-height:1.9}.article pre{border-radius:4px}.document-links{padding:20px 0 5px;font-size:13px;line-height:2;color:#337ab7}footer{max-width:950px;font-size:12px;padding:15px 0 35px}footer .brand{font-size:14px}.section-label{display:none}@media(max-width:680px){header nav{padding:0 12px;gap:5px;flex-wrap:wrap}.nav-links{order:0;width:auto;gap:0;font-size:13px;flex:1;overflow:visible;padding:0}.nav-links a{padding:15px 9px;white-space:nowrap}#language{max-width:100px;margin:8px 0}main{margin:16px 10px;padding:17px 14px}.hero h1{font-size:21px}.hero p{font-size:12px}.language-list{gap:8px 12px}.editor-head{padding-left:10px;padding-right:10px}.result-head .check{font-size:10px}.article h1{font-size:22px}.article h2{font-size:18px}.article p{font-size:14px}footer{padding:10px 18px 25px}.actions .quiet{padding:7px 8px}}