:root{color-scheme:dark;--bg:#101313;--panel:#191d1d;--text:#f0f3ee;--muted:#9ea9a6;--border:#363f3c;--accent:#c7ef8b;--button:#182010;--max:1120px}
.usage-note{color:var(--muted);font-size:12px;line-height:1.7;margin:8px 0 0}
.footer-contact{display:flex;flex-direction:column;gap:3px}.footer-contact a{color:var(--accent);font-size:14px;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px;overflow-wrap:anywhere}.footer-contact a:hover{text-decoration-thickness:2px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,"Helvetica Neue",Arial,"PingFang HK","PingFang SC",sans-serif;font-size:16px;line-height:1.6;min-height:100svh;display:flex;flex-direction:column}button,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:5px}a{color:inherit;text-decoration:none}button:disabled{cursor:wait;opacity:.55}[hidden]{display:none!important}
.header,footer{width:min(var(--max),calc(100% - 88px));margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.header{padding:32px 0;margin-top:0}.wordmark{display:flex;align-items:center;font-size:25px;font-weight:600;letter-spacing:-1px;line-height:1}.period{color:var(--accent)}.mark{display:flex;align-items:center;gap:4px;margin-right:13px}.mark i{display:block;width:4px;height:19px;background:var(--accent);transform:skew(-12deg)}.mark i:nth-child(2){height:29px}.mark i:nth-child(3){height:23px}.languages{display:flex;gap:4px}.languages button{background:none;border:1px solid transparent;color:var(--muted);padding:7px 12px;font-size:14px;border-radius:5px;min-height:38px}.languages button[aria-pressed=true]{color:var(--text);border-color:var(--border)}.languages button:hover{color:var(--accent)}
main{width:min(800px,calc(100% - 48px));margin:auto;flex:1}.workspace{padding:56px 0 64px}.intro{margin-bottom:40px}.eyebrow{font-size:12px;letter-spacing:.19em;color:var(--accent);font-weight:600;margin:0 0 23px}h1{font-size:clamp(38px,5vw,62px);font-weight:500;letter-spacing:-.045em;line-height:1.3;margin:0}h1 span{color:var(--accent)}.description{color:var(--muted);font-size:17px;line-height:1.9;margin:24px 0 0}form{padding:22px 24px;background:var(--panel);border:1px solid var(--border);border-radius:14px;transition:border-color .2s}form:focus-within{border-color:var(--accent)}.input-header{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:18px}label{font-size:14px;font-weight:500}.counter{font-size:12px;color:var(--muted);white-space:nowrap}textarea{width:100%;resize:vertical;min-height:125px;max-height:400px;display:block;border:0;background:transparent;color:var(--text);font-size:18px;line-height:1.8;padding:0;outline:none!important}textarea::placeholder{color:var(--muted);opacity:.8}.input-footer{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:18px}.powered{font-size:12px;color:var(--muted)}.submit{display:flex;align-items:center;gap:30px;background:var(--accent);color:var(--button);border:0;border-radius:6px;padding:12px 20px;font-size:14px;font-weight:600;min-height:46px}.submit:hover{filter:brightness(1.08)}.below-input{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-top:14px;color:var(--muted);font-size:12px}.below-input p{margin:0;max-width:530px}.below-input span{flex-shrink:0}.result{margin-top:34px;border-top:1px solid var(--border);padding-top:26px}.result-header{display:flex;justify-content:space-between;align-items:center}.result h2{font-size:15px;font-weight:600;margin:0;color:var(--accent)}.result-header button{color:var(--muted);background:none;border:0;padding:6px 0 6px 12px;font-size:13px}.answer{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;line-height:1.95;margin-top:22px}.result-note{color:var(--muted);font-size:12px;margin:22px 0 0}.error{font-size:14px;color:#ffbaa7;line-height:1.7;border-left:2px solid currentColor;padding-left:16px;margin:22px 0 0}
footer{border-top:1px solid var(--border);padding:26px 0;margin-bottom:0;color:var(--muted);font-size:12px}footer strong{font-weight:500;color:var(--text);display:block;font-size:14px;margin-bottom:3px}footer p{font-size:11px;letter-spacing:.06em;text-align:right}html[lang=zh-Hans]{--bg:#f6f8fc;--panel:#fff;--text:#15273e;--muted:#596a7d;--border:#ced8e5;--accent:#185bdd;--button:#fff;color-scheme:light}html[lang=zh-Hans] .error{color:#ad3822}html[lang=en]{--bg:#101724;--panel:#192332;--text:#eef3fa;--muted:#a6b4c6;--border:#34445b;--accent:#91bbff;--button:#12213b}html[lang=en] h1{letter-spacing:-.055em;font-weight:450;line-height:1.13}
@media(max-width:640px){.header,footer{width:calc(100% - 40px)}.header{padding:26px 0}.wordmark{font-size:21px}.mark{margin-right:10px;gap:3px}.languages button{padding:6px 9px}main{width:calc(100% - 40px)}.workspace{padding:34px 0 46px}.intro{margin-bottom:28px}h1{font-size:40px}.description{font-size:16px;margin-top:20px}form{padding:18px;border-radius:10px}textarea{font-size:16px;min-height:140px}.input-footer{gap:10px}.submit{gap:18px;padding:12px 16px}.below-input{display:block}.below-input span{display:block;margin-top:8px}footer{flex-direction:column;align-items:flex-start;gap:8px}footer p{text-align:left;margin:0}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}