:root{color-scheme:light;font-family:"Segoe UI","Microsoft YaHei",sans-serif;color:#252826;background:#fff;letter-spacing:0;--muted:#58605b;--line:#dce1dd;--accent:#a23d2b;--green:#35634e}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;line-height:1.7}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--accent)}button,input,select,textarea{font:inherit;letter-spacing:0}button,a,input,select,textarea{-webkit-tap-highlight-color:transparent}button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border:1px solid var(--accent);border-radius:5px;background:var(--accent);color:#fff;cursor:pointer;font-weight:600}button:hover{background:#863323}button:disabled{opacity:.55;cursor:not-allowed}.secondary{background:#fff;border-color:#b8c2bc;color:#343c37}.secondary:hover{background:#f2f5f3}.icon-button{width:46px;padding:10px;flex:none}svg{width:19px;height:19px;flex:none}:focus-visible{outline:3px solid #46775e;outline-offset:4px}::selection{background:#e7eee8;color:#252826}input,select,textarea{caret-color:var(--accent)}.skip{position:absolute;top:-100px;left:16px;background:#fff;padding:12px;z-index:2}.skip:focus{top:8px}.site-header,.site-footer,main{max-width:1248px;margin-inline:auto;padding-inline:40px}.site-header{min-height:98px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;font-size:24px;font-weight:650;text-decoration:none;white-space:nowrap}.brand img{object-fit:contain}.site-header nav{display:flex;flex-wrap:wrap;gap:24px;font-size:14px}.site-header nav a{text-decoration:none}.site-header [aria-current]{color:var(--accent);text-decoration:underline}main{padding-block:36px 48px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:32px}h1{font-size:36px;line-height:1.3;margin:0 0 8px;font-family:SimSun,"Songti SC",serif}h2{font-size:20px;line-height:1.5;margin:0 0 24px;font-weight:650}.page-heading p{margin:0;color:var(--muted)}.service-state{font-size:13px;color:var(--green);display:flex;align-items:center;gap:8px;white-space:nowrap}.service-state span{width:7px;height:7px;border-radius:50%;background:var(--green)}.calculator{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(280px,1fr);gap:48px;padding-block:28px 40px;border-block:1px solid var(--line)}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 24px}label{display:grid;gap:8px;font-size:14px;font-weight:600;min-width:0}input,select,textarea{width:100%;min-width:0;border:1px solid #b8c2bc;border-radius:5px;background:#fff;color:inherit;padding:10px 12px;line-height:1.5;min-height:46px}input::placeholder,textarea::placeholder{color:#6d756f;font-weight:400}input[type=number]{font-variant-numeric:tabular-nums}.field-note{font-size:13px;line-height:1.8;color:var(--muted);margin:20px 0 0}.error{font-size:14px;min-height:24px;color:#9c2d22;margin-block:12px}.form-actions{display:flex;gap:12px}.results{border-left:1px solid var(--line);padding-left:40px}.results dl{margin:0}.results dl>div{display:flex;justify-content:space-between;align-items:baseline;gap:16px;padding:10px 0}.results dt{color:var(--muted);font-size:14px}.results dd{margin:0;font-size:17px;font-variant-numeric:tabular-nums;overflow-wrap:anywhere;text-align:right}.results .primary-result{display:block;padding:0 0 18px;margin-bottom:14px;border-bottom:1px solid var(--line)}.primary-result dd{font-size:32px;line-height:1.5;color:var(--green);text-align:left;margin-top:8px}.primary-result dd.negative{color:#a23d2b}.about{display:grid;grid-template-columns:240px minmax(0,1fr);gap:24px;padding-top:36px}.about p{font-size:14px;color:var(--muted);margin:0 0 14px;max-width:72ch}.text-link{display:inline-flex;align-items:center;gap:5px;font-size:14px;color:var(--accent)}.site-footer{display:flex;justify-content:space-between;gap:24px;border-top:1px solid var(--line);padding-block:24px 32px;font-size:12px;color:var(--muted)}.site-footer>div{display:grid;gap:4px}.site-footer strong{color:#303631;font-size:15px}.site-footer nav{display:flex;flex-wrap:wrap;gap:8px 20px;align-content:start;justify-content:flex-end}.document{max-width:800px}.document h1{font-size:28px}.document h2{margin-top:30px;margin-bottom:10px}.document p,.document li{font-size:15px;color:var(--muted)}.document ul{padding-left:22px}.document section{border-top:1px solid var(--line);padding-top:18px;margin-top:24px}
@media(max-width:900px){.site-header,.site-footer,main{padding-inline:24px}.calculator{gap:28px;grid-template-columns:minmax(0,1fr) minmax(250px,.85fr)}.results{padding-left:26px}.about{grid-template-columns:180px minmax(0,1fr)}.site-footer{flex-direction:column}.site-footer nav{justify-content:flex-start}}
@media(max-width:680px){.site-header{align-items:flex-start;flex-direction:column;gap:12px;padding-block:16px}.site-header nav{gap:16px;font-size:13px}.brand img{width:44px;height:44px}.brand{font-size:21px}main{padding-block:24px 32px}.page-heading{align-items:flex-start;flex-direction:column;gap:12px;margin-bottom:24px}h1{font-size:30px}.calculator{grid-template-columns:minmax(0,1fr);gap:30px;padding-top:24px}.results{border-left:0;border-top:1px solid var(--line);padding:24px 0 0}.form-grid{gap:18px 16px}.about{grid-template-columns:minmax(0,1fr);gap:0}.site-footer{padding-block:20px}.primary-result dd{font-size:30px}.document h1{font-size:26px}}
@media(max-width:380px){.site-header,.site-footer,main{padding-inline:16px}.form-grid{grid-template-columns:minmax(0,1fr)}.site-header nav{gap:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}