:root{color-scheme:light;--ink:#20313e;--muted:#64727e;--blue:#1264a3;--line:#dfe6eb;--paper:#fff;--bg:#f6f8fa;--radius:14px}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.65 "Microsoft YaHei","PingFang SC",system-ui,sans-serif;-webkit-font-smoothing:antialiased}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #81b8e3;outline-offset:3px}[hidden]{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link{position:fixed;top:-80px;left:12px;z-index:10;padding:10px 18px;background:white}.skip-link:focus{top:10px}.tool-header{height:83px;display:flex;align-items:center;justify-content:space-between;gap:20px;max-width:1200px;margin:auto;padding:0 32px;border-bottom:1px solid var(--line)}.brand{color:var(--ink);font-size:19px;font-weight:700;letter-spacing:1px;white-space:nowrap}.brand span{color:var(--muted);font-weight:400;font-size:15px;border-left:1px solid #cbd6dd;margin-left:15px;padding-left:15px}.brand:hover{text-decoration:none}.back-link{font-size:14px;white-space:nowrap}.back-link span{margin-left:7px}.header-note{color:var(--muted);font-size:13px}.tool-main{max-width:1040px;padding:49px 32px 0;margin:auto}.page-top{margin-bottom:28px}.eyebrow,.page-category{font-size:12px;color:var(--blue);font-weight:600;letter-spacing:1.5px;margin:0 0 12px}h1{font-size:32px;line-height:1.3;letter-spacing:-.7px;margin:0 0 13px;font-weight:650}.page-description{color:var(--muted);margin:0;font-size:15px;max-width:760px}.calculator-layout{display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);gap:22px;align-items:start}.input-panel,.result-panel,.knowledge-panel{padding:27px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);min-width:0}.panel-title{font-size:15px;font-weight:600;margin:0 0 23px}.field{margin:0 0 22px;min-width:0}.field-label{display:block;font-size:14px;color:#334854;margin-bottom:8px}.input-row{display:flex;min-width:0;border:1px solid #cbd6de;border-radius:8px;background:#fff;overflow:hidden}.input-row:focus-within{border-color:var(--blue);box-shadow:0 0 0 2px #1264a312}.input-row input{width:0;flex:1;min-width:0;padding:11px 13px;border:0;background:transparent;color:var(--ink);outline:0;font-variant-numeric:tabular-nums}.input-row select{max-width:125px;border:0;border-left:1px solid var(--line);padding:8px;background:#f8fafb;color:#536875;font-size:13px;min-height:46px}.unit-static{padding:10px 13px;font-size:13px;color:var(--muted)}textarea{display:block;width:100%;min-height:120px;padding:12px;border:1px solid #cbd6de;border-radius:8px;resize:vertical;font-variant-numeric:tabular-nums;font-size:15px}.field-hint,.helper-link{font-size:12px;line-height:1.6;margin:7px 0 0;color:var(--muted)}.helper-link a{display:inline-block;min-height:24px}.toggle-label{display:flex;align-items:center;gap:10px;min-height:44px;font-size:14px}.toggle-label input{width:18px;height:18px;accent-color:var(--blue)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:5px}.primary,.secondary,.text-button{min-height:44px;border-radius:8px;padding:9px 17px;border:1px solid transparent;font-size:14px}.primary{background:var(--blue);color:#fff;min-width:104px}.primary:hover{background:#0b528a}.secondary{border-color:var(--line);background:#fff;color:#3e5362}.text-button{background:transparent;color:var(--blue);padding-left:7px;padding-right:7px}.error-message{margin:16px 0 0;padding:10px 12px;border-radius:7px;border:1px solid #efc9b8;background:#fff7f2;color:#9c4228;font-size:14px}.result-panel{background:#edf4f9;border-color:#dce7f0}.result-placeholder{min-height:135px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;color:#657987;font-size:14px}.placeholder-symbol{color:#91adbf;font-size:30px;line-height:1;margin-bottom:15px}.result-primary{padding:0 0 18px;margin-bottom:15px;border-bottom:1px solid #d7e3ed}.result-label{font-size:13px;color:#5b7180;margin:0 0 7px}.result-value{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;font-variant-numeric:tabular-nums;overflow-wrap:anywhere;font-size:31px;line-height:1.35;font-weight:600;letter-spacing:-.5px;color:#144f79}.result-unit{font-size:14px;font-weight:400;letter-spacing:0;white-space:nowrap}.result-row{display:flex;justify-content:space-between;gap:16px;align-items:baseline;padding:8px 0;font-size:13px}.result-row>span:first-child{color:#5b7180}.result-row>strong{font-size:14px;font-weight:500;text-align:right;overflow-wrap:anywhere}.result-row .result-unit{font-size:12px}.result-text{font-size:14px;overflow-wrap:anywhere}.result-snapshot{font-size:12px;line-height:1.7;border-top:1px solid #d7e3ed;margin-top:15px;padding-top:12px;color:#657987;white-space:pre-line;overflow-wrap:anywhere}.copy-result{font-size:12px;background:transparent;border:0;color:var(--blue);padding:10px 0;min-height:40px}.calculation-note{font-size:13px;color:var(--muted);line-height:1.9;margin:22px 0 0;padding:0 2px;overflow-wrap:anywhere}.formula-box{margin-top:24px;border-top:1px solid var(--line);padding-top:19px;color:#566b78;font-size:13px}.formula-box h2{font-size:13px;margin:0 0 7px;color:#3e5362;font-weight:600}.formula-text{margin:0;font:14px/1.8 "Cambria Math","Microsoft YaHei",sans-serif;overflow-wrap:anywhere}.advanced{border-top:1px solid var(--line);margin:0 0 20px;padding-top:12px}.advanced summary{cursor:pointer;color:var(--muted);font-size:13px;min-height:36px;padding:5px 0}.advanced .field{margin-top:13px}.mode-tabs{display:flex;padding:4px;background:#f1f5f8;border-radius:9px;gap:3px;margin-bottom:24px}.mode-tabs button{flex:1;border:0;background:transparent;padding:8px;font-size:13px;color:var(--muted);border-radius:6px;min-height:38px}.mode-tabs button[aria-pressed=true]{background:white;color:var(--blue);box-shadow:0 1px 4px #20313e0c}.knowledge-panel{max-width:830px;padding:30px}.knowledge-section+.knowledge-section{border-top:1px solid #edf0f3;margin-top:23px;padding-top:23px}.knowledge-section h2{font-size:17px;margin:0 0 9px}.knowledge-section p{font-size:15px;line-height:1.9;margin:0;color:#536875}.tool-footer{max-width:1040px;margin:38px auto 0;padding:22px 32px 32px;border-top:1px solid var(--line)}.disclaimer{font-size:12px;line-height:1.85;color:#74828b;margin:0 0 12px;overflow-wrap:anywhere}.tool-footer>a{font-size:12px}.hub-main{max-width:1200px;padding:48px 32px 0;margin:auto}.hub-intro h1{font-size:41px;letter-spacing:-1px;margin-bottom:12px}.intro-text{color:var(--muted);margin:0 0 28px;font-size:16px}.hub-search{display:flex;align-items:center;max-width:670px;min-height:55px;border:1px solid #d2dce3;border-radius:11px;background:white;box-shadow:0 3px 12px #263c4a04}.hub-search>span{font-size:29px;color:#7e96a6;margin:0 14px 1px 18px;line-height:1}.hub-search input{flex:1;min-width:0;background:transparent;border:0;outline:0;padding:14px 12px 14px 0;font-size:15px}.hub-search button{background:transparent;border:0;color:var(--muted);font-size:12px;padding:12px}.filter-row{padding:27px 0 23px;margin-top:8px}.category-filters{display:flex;flex-wrap:wrap;gap:7px}.category-filters button{font-size:12px;border:1px solid #e0e7ec;background:transparent;border-radius:7px;padding:7px 12px;min-height:37px;color:#617483}.category-filters button[aria-pressed=true]{color:white;border-color:var(--blue);background:var(--blue)}.catalog-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:12px 0 17px}.catalog-heading h2{font-size:17px;font-weight:600;margin:0}.catalog-heading p{font-size:12px;color:var(--muted);margin:0}.tools-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.tool-card{display:block;border:1px solid var(--line);background:white;padding:22px 22px 20px;border-radius:12px;transition:border-color .15s,box-shadow .15s;color:var(--ink);min-width:0}.tool-card:hover{border-color:#aac5d9;box-shadow:0 5px 18px #17496a08;text-decoration:none}.card-category{display:block;font-size:11px;color:#7a8c98;margin-bottom:12px;letter-spacing:.4px}.tool-card h3{font-size:17px;line-height:1.5;margin:0 0 9px;display:flex;justify-content:space-between;gap:12px;font-weight:600}.tool-card h3 span{font-size:16px;color:#9aafbd;font-weight:400}.tool-card p{font-size:13px;color:#73818c;line-height:1.8;margin:0}.hub-footer{max-width:1200px;font-size:12px;color:var(--muted);margin-top:38px}.empty-state{padding:45px 20px;text-align:center;background:white;border:1px solid var(--line);border-radius:12px;font-size:14px;color:var(--muted)}.no-js-note{font-size:13px;color:var(--muted)}.family-trigger{width:100%;background:#fff;border:1px solid #cbd6de;border-radius:8px;padding:12px;color:#365a72;text-align:left;margin-bottom:22px;min-height:46px}.unit-dialog{width:min(550px,calc(100% - 32px));padding:24px;border:1px solid var(--line);border-radius:16px;max-height:80vh;color:var(--ink)}.unit-dialog::backdrop{background:#1731435c}.dialog-title{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.dialog-title h2{font-size:18px;margin:0}.dialog-title button{border:0;background:transparent;padding:7px 12px;font-size:22px;color:#6a7f8d;min-height:44px}.unit-dialog input{width:100%;padding:11px 13px;border:1px solid #cbd6de;border-radius:8px;margin-bottom:17px}.family-list{display:grid;grid-template-columns:1fr 1fr;gap:9px}.family-list button{min-height:44px;padding:10px;background:#f7f9fb;border:1px solid #e0e7ec;border-radius:8px;text-align:left;font-size:14px;color:#365a72}.family-list button:hover{background:#edf4f9}
@media(min-width:1400px){.hub-main{padding-top:61px}.hub-intro{margin-bottom:10px}}@media(max-width:900px){.tools-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-main{padding-top:35px}.input-panel,.result-panel{padding:22px}.tool-header{height:75px}}@media(max-width:640px){.tool-header{height:69px;padding:0 20px;gap:12px}.brand{font-size:16px;letter-spacing:.5px}.brand span{font-size:13px;margin-left:10px;padding-left:10px}.back-link{font-size:12px}.header-note{display:none}.tool-main,.hub-main{padding:31px 18px 0}h1{font-size:27px}.page-top{margin-bottom:23px}.page-category{font-size:11px;margin-bottom:10px}.page-description{font-size:14px}.calculator-layout{grid-template-columns:1fr;gap:16px}.input-panel,.result-panel{padding:23px 20px;border-radius:12px}.panel-title{margin-bottom:19px}.field{margin-bottom:20px}.input-row input{font-size:16px}.result-placeholder{min-height:75px}.result-value{font-size:31px}.tool-footer{margin-top:28px;padding:20px 20px 28px}.disclaimer{font-size:11px}.hub-intro h1{font-size:33px}.intro-text{font-size:14px;line-height:1.8}.eyebrow{font-size:11px}.hub-search{min-height:52px}.hub-search input{font-size:14px}.hub-search>span{margin-left:14px;margin-right:10px}.filter-row{padding-top:21px}.category-filters{gap:6px}.category-filters button{padding:7px 10px}.tools-grid{grid-template-columns:1fr;gap:11px}.tool-card{padding:19px 20px}.tool-card h3{font-size:17px}.card-category{margin-bottom:8px}.tool-card p{font-size:13px}.knowledge-panel{padding:24px 21px}.knowledge-section p{font-size:14px}.hub-footer{padding-left:20px;padding-right:20px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{body{background:#fff}.tool-header,.actions,.copy-result,.hub-search,.filter-row,.family-trigger{display:none!important}.calculator-layout{display:block}.input-panel{border:0;padding:0}.result-panel{margin-top:20px;break-inside:avoid;background:#fff}.tool-main{padding-top:10px}.tool-footer{break-inside:avoid}.disclaimer{color:#555}.tool-card{break-inside:avoid}}
.tool-title-row{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:13px}.tool-title-row h1{min-width:0;margin:0;overflow-wrap:anywhere}.tool-title-row .title-back{display:inline-flex;align-items:center;justify-content:center;gap:7px;flex:0 0 auto;min-height:44px;padding:9px 15px;border:1px solid var(--blue);border-radius:8px;background:var(--blue);color:#fff;font-size:14px;font-weight:500;line-height:1.5;text-decoration:none;white-space:nowrap}.tool-title-row .title-back:hover{background:#0b528a;border-color:#0b528a;text-decoration:none}.tool-title-row .title-back span{margin:0;font-size:16px}@media(max-width:640px){.tool-title-row{align-items:flex-start;gap:12px}.tool-title-row .title-back{min-height:42px;padding:9px 10px;font-size:12px;gap:5px}.tool-title-row .title-back span{font-size:14px}}@media print{.tool-title-row .title-back{display:none}}
.tool-header .brand{display:inline-flex;align-items:center;flex-shrink:0}.tool-header .brand-logo{display:block;width:48px;height:48px;object-fit:contain;flex-shrink:0}@media(max-width:640px){.tool-header .brand-logo{width:42px;height:42px}}
.brand .brand-lockup{display:flex;align-items:center;gap:10px;border:0;margin:0;padding:0}.tool-header .brand-logo{width:54px;height:54px}.brand-wordmark{display:block;width:232px;height:auto;object-fit:contain}.footer-company{margin-top:18px;padding-top:16px;border-top:1px solid var(--line);font-size:12px;color:#71818e}.footer-copyright{margin:0 0 8px;line-height:1.8}.footer-contact{display:flex;flex-wrap:wrap;gap:6px 24px;font-size:12px;line-height:1.8}.footer-contact>span{max-width:100%;overflow-wrap:anywhere}.footer-contact a{color:#607b90}.footer-reference{margin:0;font-size:12px}@media(max-width:640px){.brand .brand-lockup{gap:8px}.tool-header .brand-logo{width:42px;height:42px}.brand-wordmark{width:180px}.footer-contact{gap:5px 16px}.footer-company{font-size:11px}}@media(max-width:360px){.brand-wordmark{width:160px}.brand .brand-channel{margin-left:8px;padding-left:8px}}
.tool-footer-nav{display:flex;align-items:center;flex-wrap:wrap;gap:5px 24px;font-size:12px}.tool-footer-nav a{display:inline-flex;align-items:center;min-height:36px;white-space:nowrap}.tool-footer-nav .official-home{font-weight:500}