:root{--bg:#fafaf9;--surface:#fff;--ink:#1c1917;--muted:#57534e;--soft:#78716c;--line:#e7e5e4;--line-strong:#d6d3d1;--accent:#d97706;--accent-dark:#b45309;--accent-soft:#fffbeb;--ok:#15803d;--radius:14px;--shadow:0 1px 2px #1c19170d, 0 10px 30px #1c19170d;--max:1120px;--font:ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;--mono:ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace}*,:before,:after{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--ink);margin:0;font-size:16px;line-height:1.6}img,svg{max-width:100%}a{color:inherit;text-decoration:none}a:hover{color:var(--accent-dark)}h1,h2,h3,h4{letter-spacing:-.02em;line-height:1.2}p{margin:0 0 14px}html[lang=zh-Hans] body{line-height:1.75}html[lang=zh-Hans] h1,html[lang=zh-Hans] h2,html[lang=zh-Hans] h3,html[lang=zh-Hans] h4{letter-spacing:0}html[lang=zh-Hans] .hero h1{max-width:16ch}.container{width:100%;max-width:var(--max);margin:0 auto;padding:0 20px}.skip-link{background:var(--ink);color:#fff;z-index:100;border-radius:8px;padding:8px 12px;position:absolute;top:8px;left:-9999px}.skip-link:focus{left:12px}[hidden]{display:none!important}.legal{max-width:760px;padding:12px 0 40px}.side-notes{color:var(--muted);gap:8px;margin:0;padding-left:18px;font-size:13.5px;display:grid}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.site-header{z-index:50;backdrop-filter:blur(10px);border-bottom:1px solid var(--line);background:#fafaf9f0;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:24px;min-height:64px;display:flex}.brand{letter-spacing:-.02em;white-space:nowrap;align-items:center;gap:10px;font-weight:800;display:inline-flex}.brand-mark{background:var(--accent);color:#fff;border-radius:9px;flex:none;place-items:center;width:32px;height:32px;display:grid}.brand-name{font-size:17px}.nav{color:var(--muted);scrollbar-width:none;flex:1;justify-content:flex-end;align-items:center;gap:20px;min-width:0;font-size:14px;display:flex;overflow-x:auto}.nav::-webkit-scrollbar{display:none}.nav a{white-space:nowrap;border-bottom:2px solid #0000;padding:6px 0}.nav a:hover{color:var(--ink)}.nav a[aria-current=page]{color:var(--ink);border-bottom-color:var(--accent)}.lang-switch{border:1px solid var(--line-strong);min-height:32px;color:var(--muted);white-space:nowrap;background:#fff;border-radius:999px;flex:none;justify-content:center;align-items:center;padding:5px 11px;font-size:12.5px;font-weight:600;display:inline-flex}.lang-switch:hover{border-color:var(--accent);color:var(--accent-dark)}.hero{padding:56px 0 20px}.eyebrow{letter-spacing:.1em;text-transform:uppercase;color:var(--accent-dark);background:var(--accent-soft);border:1px solid #fde68a;border-radius:999px;margin-bottom:16px;padding:5px 10px;font-size:11px;font-weight:700;display:inline-block}.hero h1{max-width:20ch;margin:0 0 14px;font-size:clamp(2rem,4.6vw,3.25rem)}.hero-lede{color:var(--muted);max-width:62ch;margin-bottom:0;font-size:1.05rem}.search{max-width:520px;margin-top:24px;position:relative}.search svg{color:var(--soft);pointer-events:none;position:absolute;top:50%;left:14px;transform:translateY(-50%)}.search input{border:1px solid var(--line-strong);width:100%;font:inherit;color:var(--ink);background:#fff;border-radius:12px;padding:13px 16px 13px 44px;font-size:15px}.search input:focus{border-color:var(--accent);outline-offset:1px;outline:2px solid #d977062e}.trust-row{color:var(--muted);flex-wrap:wrap;gap:8px 22px;margin-top:22px;font-size:13px;display:flex}.trust-row span{align-items:center;gap:6px;display:inline-flex}.trust-row svg{color:var(--ok);flex:none}.section{padding:32px 0}.section-head{justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:18px;display:flex}.section-head h2{margin:0;font-size:1.5rem}.section-head p{color:var(--muted);margin:6px 0 0;font-size:14px}.calc-grid{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;display:grid}.calc-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);flex-direction:column;gap:10px;padding:20px;transition:transform .15s,border-color .15s;display:flex}.calc-card:hover{border-color:var(--line-strong);color:inherit;transform:translateY(-2px)}.tag{letter-spacing:.08em;text-transform:uppercase;color:var(--accent-dark);font-size:11px;font-weight:700}.calc-card h3{margin:0;font-size:1.06rem}.calc-card p{color:var(--muted);margin:0;font-size:.9rem}.card-link{color:var(--accent-dark);margin-top:auto;padding-top:8px;font-size:13px;font-weight:700}.category-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;display:grid}.category-card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);padding:22px}.category-card h3{margin:0 0 8px;font-size:1.1rem}.category-card p{color:var(--muted);margin:0 0 14px;font-size:.92rem}.category-card .card-link{padding-top:0}.breadcrumb{color:var(--soft);flex-wrap:wrap;gap:8px;margin:24px 0 12px;font-size:13px;display:flex}.breadcrumb a{color:var(--muted)}.breadcrumb a:hover{color:var(--accent-dark)}.page-title{margin:0 0 10px;font-size:clamp(1.8rem,3.6vw,2.6rem)}.lede{color:var(--muted);max-width:68ch;margin:0 0 12px;font-size:1.02rem}.meta-line{color:var(--soft);flex-wrap:wrap;gap:8px 16px;margin:0 0 8px;font-size:12.5px;display:flex}.calc-layout{grid-template-columns:minmax(0,1fr) 300px;align-items:start;gap:32px;padding-bottom:40px;display:grid}.calc-main{min-width:0}.sidebar{gap:20px;display:grid;position:sticky;top:84px}.side-card{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px}.side-card h2{letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:0 0 12px;font-size:12px}.side-list{gap:10px;margin:0;padding:0;font-size:14px;list-style:none;display:grid}.side-list a{color:var(--ink);justify-content:space-between;gap:8px;display:flex}.side-list a:after{content:"→";color:var(--accent)}.side-list a:hover{color:var(--accent-dark)}.calc-shell{background:var(--surface);border:1px solid var(--line-strong);box-shadow:var(--shadow);border-radius:18px;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);margin:20px 0 28px;display:grid;overflow:hidden}.calc-form{border-right:1px solid var(--line);padding:24px}.calc-fields{grid-template-columns:1fr 1fr;gap:16px;display:grid}.field{min-width:0}.field label{margin-bottom:6px;font-size:13px;font-weight:600;display:block}.input-wrap{border:1px solid var(--line-strong);background:#fff;border-radius:10px;align-items:stretch;display:flex;overflow:hidden}.input-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px #d9770624}.input-wrap input{width:100%;min-width:0;font:inherit;color:var(--ink);background:0 0;border:0;flex:1;padding:10px 12px;font-size:15px}.input-wrap input:focus{outline:none}.input-wrap select{border:0;border-left:1px solid var(--line);font:inherit;color:var(--muted);cursor:pointer;background:#fafaf9;padding:0 6px;font-size:12.5px}.input-wrap select:focus{background:#f5f5f4;outline:none}.suffix{border-left:1px solid var(--line);color:var(--soft);white-space:nowrap;background:#fafaf9;align-items:center;padding:0 10px;font-size:12px;display:flex}.field>select{border:1px solid var(--line-strong);width:100%;font:inherit;color:var(--ink);cursor:pointer;background:#fff;border-radius:10px;padding:10px 12px;font-size:15px}.field>select:focus{border-color:var(--accent);outline:none;box-shadow:0 0 0 3px #d9770624}.help{color:var(--soft);margin:6px 0 0;font-size:11.5px;line-height:1.45}.calc-actions{border-top:1px solid var(--line);flex-wrap:wrap;gap:10px;margin-top:20px;padding-top:18px;display:flex}.btn{border:1px solid var(--line-strong);color:var(--ink);font:inherit;cursor:pointer;background:#fff;border-radius:9px;justify-content:center;align-items:center;gap:6px;padding:9px 14px;font-size:13px;font-weight:600;display:inline-flex}.btn:hover{border-color:var(--accent);color:var(--accent-dark)}.btn-primary{background:var(--accent-dark);border-color:var(--accent-dark);color:#fff}.btn-primary:hover{color:#fff;background:#92400e;border-color:#92400e}.calc-result{background:linear-gradient(#fffbeb 0%,#fff 70%);flex-direction:column;padding:24px;display:flex}.result-label{letter-spacing:.09em;text-transform:uppercase;color:var(--accent-dark);margin:0;font-size:11.5px;font-weight:700}.result-value{letter-spacing:-.03em;margin:4px 0 18px;font-size:clamp(2rem,4vw,2.75rem);font-weight:800;line-height:1.1}.result-rows{border-top:1px solid var(--line);margin:0}.result-rows>div{border-bottom:1px solid var(--line);justify-content:space-between;align-items:baseline;gap:12px;padding:9px 0;font-size:14px;display:flex}.result-rows dt{color:var(--muted)}.result-rows dd{text-align:right;margin:0;font-weight:700}.result-note{color:var(--soft);margin:14px 0 0;font-size:12px;line-height:1.5}.mobile-summary{display:none}#calc-result{scroll-margin-top:72px}.ad-slot{margin:26px 0}.ad-label{text-align:center;letter-spacing:.12em;text-transform:uppercase;color:var(--soft);margin-bottom:6px;font-size:10px;display:block}.ad-placeholder{border:1px dashed var(--line-strong);color:#a8a29e;letter-spacing:.04em;background:#fff;border-radius:12px;place-items:center;min-height:110px;font-size:12px;display:grid}.ad-placeholder.is-sidebar{min-height:250px}.prose{max-width:72ch}.prose h2{margin:34px 0 10px;font-size:1.35rem}.prose h2:first-child{margin-top:0}.prose p{color:var(--muted)}.prose ul,.prose ol{color:var(--muted);margin:0 0 16px;padding-left:22px}.prose li{margin:6px 0}.prose strong{color:var(--ink)}.prose table{border-collapse:collapse;width:100%;margin:14px 0 20px;font-size:14px}.prose th,.prose td{text-align:left;vertical-align:top;border-bottom:1px solid var(--line);padding:10px 12px}.prose th{color:var(--muted);letter-spacing:.05em;text-transform:uppercase;background:#f5f5f4;font-size:11.5px;font-weight:700}.prose tbody tr:last-child td{border-bottom:0}.table-wrap{border:1px solid var(--line);background:#fff;border-radius:12px;margin:14px 0 20px;overflow-x:auto}.table-wrap table{min-width:420px;margin:0}.table-caption{color:var(--soft);margin:0;padding:10px 12px 0;font-size:12px}.callout{background:var(--accent-soft);border:1px solid #fde68a;border-radius:12px;margin:18px 0;padding:18px 20px}.callout p:last-child{margin-bottom:0}.callout-title{letter-spacing:.08em;text-transform:uppercase;color:var(--accent-dark);margin-bottom:6px;font-size:12px;font-weight:700}.formula{background:var(--ink);color:#fafaf9;font-family:var(--mono);border-radius:12px;margin:14px 0;padding:16px;font-size:13px;line-height:1.7;overflow-x:auto}.formula code{font-family:inherit}.faq{border-top:1px solid var(--line);margin-top:10px}.faq details{border-bottom:1px solid var(--line);padding:14px 0}.faq summary{cursor:pointer;justify-content:space-between;gap:16px;font-weight:600;list-style:none;display:flex}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";color:var(--accent);flex:none;font-weight:700}.faq details[open] summary:after{content:"−"}.faq details p{color:var(--muted);margin:10px 0 0;font-size:14.5px}.site-footer{border-top:1px solid var(--line);background:var(--surface);margin-top:56px}.footer-grid{grid-template-columns:1.6fr 1fr 1fr 1fr;gap:28px;padding:40px 0 32px;display:grid}.footer-brand .brand{margin-bottom:12px}.footer-note{color:var(--muted);max-width:34ch;margin:0;font-size:13.5px}.footer-grid h3{letter-spacing:.09em;text-transform:uppercase;color:var(--soft);margin:0 0 10px;font-size:11px}.footer-grid ul{gap:8px;margin:0;padding:0;font-size:13.5px;list-style:none;display:grid}.footer-grid ul a{color:var(--muted)}.footer-grid ul a:hover{color:var(--accent-dark)}.footer-bottom{border-top:1px solid var(--line);color:var(--soft);flex-wrap:wrap;justify-content:space-between;gap:8px 20px;padding:16px 0;font-size:12px;display:flex}.not-found{text-align:center;padding:80px 0}.not-found h1{margin:0 0 12px;font-size:clamp(2rem,5vw,3rem)}.not-found p{color:var(--muted);margin-bottom:24px}@media (width<=900px){.calc-layout{grid-template-columns:1fr;padding-bottom:96px}body:has(.mobile-summary){padding-bottom:68px}.mobile-summary{z-index:45;padding:10px 20px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line-strong);backdrop-filter:blur(8px);background:#fffffff7;justify-content:space-between;align-items:center;gap:12px;display:flex;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -8px 24px #1c191714}.mobile-summary-label{letter-spacing:.08em;text-transform:uppercase;color:var(--accent-dark);font-size:10px;font-weight:700;display:block}.mobile-summary-value{letter-spacing:-.02em;font-size:18px;line-height:1.2;display:block}.sidebar{position:static}.calc-shell{grid-template-columns:1fr}.calc-form{border-right:0;border-bottom:1px solid var(--line)}.footer-grid{grid-template-columns:1fr 1fr}}@media (width<=640px){.hero{padding-top:40px}.header-inner{gap:10px;min-height:58px}.brand-name{font-size:14px}.nav{justify-content:flex-start;gap:10px;font-size:12.5px}.nav-all{display:none}.calc-fields{grid-template-columns:1fr}.calc-form,.calc-result{padding:18px}.footer-grid{grid-template-columns:1fr;gap:24px}}@media (width<=480px){.brand-name{display:none}.header-inner{gap:8px}.nav{gap:9px}.lang-switch{padding:4px 8px;font-size:11.5px}}@media print{.site-header,.site-footer,.ad-slot,.sidebar,.calc-actions,.breadcrumb,.faq,.related,.mobile-summary{display:none!important}body{background:#fff}.calc-layout{display:block}.calc-shell{box-shadow:none;border-color:#999;grid-template-columns:1fr 1fr}}