/* base.css — structure shared by both sites. China-hosted: no external fonts, no CDN. */
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:84px}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","微软雅黑","Source Han Sans CN","Noto Sans CJK SC",sans-serif;font-size:16px;line-height:1.85;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,svg{max-width:100%;height:auto}
a{color:var(--link);text-decoration:none}
a:hover{color:var(--link-h)}
h1,h2,h3,h4{margin:0;line-height:1.35;color:var(--head);font-weight:700}
p{margin:0 0 1em}
code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.9em;background:var(--code-bg);color:var(--code-ink);padding:1px 6px;border-radius:3px;word-break:break-all}
.num,.art-meta,.kv b{font-family:"DIN Alternate","Bahnschrift","Roboto Condensed","Arial Narrow",Arial,sans-serif;font-variant-numeric:tabular-nums}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.narrow{max-width:820px}
.muted{color:var(--mute)}
.skip{position:absolute;left:-999px;top:0;background:#000;color:#fff;padding:8px 14px;z-index:200}
.skip:focus{left:8px;top:8px}
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px;opacity:0}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:11px 22px;border-radius:var(--r);font-weight:700;font-size:15px;line-height:1.3;border:1.5px solid transparent;cursor:pointer;transition:transform .12s,box-shadow .12s,background .12s;font-family:inherit;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn.sm{padding:7px 14px;font-size:14px}
.btn.block{display:flex;width:100%}
.btn-cta{background:var(--cta);color:var(--cta-ink)}
.btn-cta:hover{background:var(--cta-h);color:var(--cta-ink);box-shadow:0 6px 18px var(--cta-sh)}
.btn-line{border-color:var(--brand);color:var(--brand);background:transparent}
.btn-line:hover{background:var(--brand);color:#fff}
.btn[disabled]{opacity:.6;cursor:default}

/* header */
.hd{position:sticky;top:0;z-index:50;background:var(--hd-bg);border-bottom:1px solid var(--hd-line)}
.hd-in{display:flex;align-items:center;gap:18px;height:66px}
.brand{display:flex;align-items:center;gap:10px;color:var(--hd-ink);flex:none;min-width:0}
.brand-mark{display:inline-flex;width:38px;height:38px;flex:none}
.brand-mark svg{width:38px;height:38px;display:block}
.brand-tx{display:flex;flex-direction:column;line-height:1.2;min-width:0}
.brand-tx b{font-size:18px;letter-spacing:.5px;color:var(--hd-ink)}
.brand-tx i{font-style:normal;font-size:11.5px;color:var(--hd-mute);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.nav{display:flex;gap:2px;margin-left:auto}
.nav a{color:var(--hd-ink);font-size:15px;padding:8px 11px;border-radius:var(--r);white-space:nowrap}
.hd-r{display:flex;align-items:center;gap:12px;flex:none}
.hd-tel{font-weight:700;color:var(--hd-ink);font-size:15px;font-family:"DIN Alternate","Bahnschrift",Arial,sans-serif;white-space:nowrap}
.burger{display:none;width:40px;height:40px;border:0;background:transparent;padding:9px;cursor:pointer}
.burger span{display:block;height:2px;background:var(--hd-ink);margin:5px 0;border-radius:2px;transition:.2s}
.burger.on span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.on span:nth-child(2){opacity:0}
.burger.on span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* crumbs */
.crumbs{font-size:13px;color:var(--mute);padding-top:16px;padding-bottom:0;display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.crumbs a{color:var(--mute)}.crumbs a:hover{color:var(--brand)}.crumbs i{font-style:normal;opacity:.5}

/* article layout */
.art-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:44px;padding-top:18px;padding-bottom:60px;align-items:start}
.art{min-width:0}
.kicker{display:inline-block;font-size:13px;font-weight:700;letter-spacing:1px;color:var(--brand)}
.art-hd h1{font-size:32px;margin:8px 0 12px;letter-spacing:.3px}
.art-meta{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:13px;color:var(--mute);margin-bottom:22px}
.lede{font-size:17px;color:var(--ink-2);max-width:760px}
.capsule{background:var(--cap-bg);border:1px solid var(--cap-line);border-radius:var(--r2);padding:18px 22px;margin:0 0 24px}
.capsule b{display:block;font-size:13px;letter-spacing:1px;color:var(--brand);margin-bottom:4px}
.capsule p{margin:0;font-size:16.5px;line-height:1.8;color:var(--head)}
.toc{border:1px solid var(--line);border-radius:var(--r2);padding:16px 22px;margin:0 0 28px;background:var(--panel)}
.toc b{font-size:14px;color:var(--mute)}
.toc ol{margin:6px 0 0;padding-left:20px;columns:2;column-gap:32px;font-size:14.5px}
.toc li{break-inside:avoid;margin:2px 0}
.toc a{color:var(--ink-2)}.toc a.on,.toc a:hover{color:var(--brand)}

.prose{font-size:16.5px}
.prose h2{font-size:24px;margin:44px 0 16px}
.prose h3{font-size:19px;margin:30px 0 10px}
.prose ul,.prose ol{padding-left:24px;margin:0 0 1.1em}
.prose li{margin:.35em 0}
.prose a{border-bottom:1px solid var(--link-line)}
.prose strong{color:var(--head)}
.tbl{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--line);border-radius:var(--r2);-webkit-overflow-scrolling:touch}
table{border-collapse:collapse;width:100%;font-size:14.5px;line-height:1.65;min-width:520px}
th,td{padding:10px 13px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
th{background:var(--th-bg);color:var(--th-ink);font-weight:700;white-space:nowrap;position:sticky;top:0}
tbody tr:last-child td{border-bottom:0}
tbody tr:nth-child(even) td{background:var(--zebra)}
.formula{background:var(--formula-bg);color:var(--formula-ink);border-radius:var(--r2);padding:16px 20px;margin:0 0 1.2em;font-weight:700;font-size:17px;line-height:1.9;overflow-x:auto}
.eg,.note,.warn{border-radius:var(--r2);padding:16px 20px 4px;margin:0 0 1.3em;border:1px solid var(--line);position:relative}
.eg{background:var(--eg-bg);border-color:var(--eg-line)}
.eg::before{content:"算例";}
.note::before{content:"提示"}
.warn::before{content:"常见错误"}
.eg::before,.note::before,.warn::before{display:inline-block;font-size:12px;font-weight:700;letter-spacing:1px;padding:1px 9px;border-radius:99px;margin-bottom:8px;background:var(--brand);color:#fff}
.warn{background:var(--warn-bg);border-color:var(--warn-line)}.warn::before{background:var(--warn)}
.note{background:var(--panel)}
.eg .tbl{background:#fff}

.cta-band{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:36px 0;padding:22px 26px;border-radius:var(--r2);background:var(--band-bg);color:var(--band-ink)}
.cta-band b{display:block;font-size:19px;color:var(--band-head)}
.cta-band p{margin:4px 0 0;font-size:14.5px;opacity:.9}
.cta-k{font-size:12px;font-weight:700;letter-spacing:1px;color:var(--band-k)}

.faq h2,.rels h2{font-size:22px;margin:44px 0 14px}
.faq details{border:1px solid var(--line);border-radius:var(--r2);margin-bottom:10px;background:var(--panel)}
.faq summary{cursor:pointer;padding:14px 44px 14px 18px;font-weight:700;color:var(--head);list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:18px;top:10px;font-size:22px;color:var(--brand);font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq details p{padding:0 18px 16px;margin:0;color:var(--ink-2)}
.rel-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.rel{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:13px 16px;border:1px solid var(--line);border-radius:var(--r2);color:var(--head);font-weight:700;font-size:15px;background:var(--panel)}
.rel i{font-style:normal;color:var(--brand)}.rel:hover{border-color:var(--brand);color:var(--brand)}
.pn-row{display:flex;justify-content:space-between;gap:14px;margin-top:28px}
.pn{flex:1;padding:12px 16px;border:1px solid var(--line);border-radius:var(--r2);font-size:14.5px;color:var(--head);font-weight:700}
.pn i{display:block;font-style:normal;font-weight:400;font-size:12px;color:var(--mute)}.pn.next{text-align:right}
.disc{font-size:13px;color:var(--mute);margin-top:28px;border-top:1px dashed var(--line);padding-top:14px}

/* sidebar */
.side{position:sticky;top:86px;display:flex;flex-direction:column;gap:18px}
.side-card{border:1px solid var(--line);border-radius:var(--r2);padding:20px;background:var(--panel)}
.side-card h3{font-size:17px;margin-bottom:6px}
.side-card p{font-size:14px;color:var(--ink-2);margin-bottom:12px}
.side-lead{border-color:var(--brand);box-shadow:var(--sh)}
.side-list{list-style:none;margin:0;padding:0;font-size:14.5px}
.side-list li{border-top:1px solid var(--line)}.side-list li:first-child{border:0}
.side-list a{display:block;padding:8px 0;color:var(--ink)}.side-list a:hover{color:var(--brand)}

/* forms */
.lead .field{margin-bottom:10px}
.lead label{display:block;font-size:13.5px;color:var(--ink-2);font-weight:600}
.lead label em{color:var(--warn);font-style:normal;margin-left:2px}
.lead input:not([type=checkbox]),.lead select,.calc input,.calc select,.calc textarea{display:block;width:100%;margin-top:4px;padding:10px 12px;font-size:15px;font-family:inherit;border:1.5px solid var(--line-2);border-radius:var(--r);background:#fff;color:var(--ink);outline:0;-webkit-appearance:none;appearance:none}
.lead select,.calc select{background-image:linear-gradient(45deg,transparent 50%,var(--mute) 50%),linear-gradient(135deg,var(--mute) 50%,transparent 50%);background-position:calc(100% - 18px) 50%,calc(100% - 13px) 50%;background-size:5px 5px;background-repeat:no-repeat;padding-right:32px}
.lead input:focus,.lead select:focus,.calc input:focus,.calc textarea:focus,.calc select:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--focus)}
.consent{display:flex!important;gap:8px;align-items:flex-start;font-weight:400!important;font-size:12.5px!important;line-height:1.6;margin:10px 0;color:var(--mute)!important}
.consent input{margin-top:3px;flex:none;width:15px;height:15px;accent-color:var(--brand)}
.form-msg{font-size:13.5px;min-height:0}.form-msg.err{color:var(--warn);background:var(--warn-bg);padding:8px 12px;border-radius:var(--r);margin-bottom:10px}
.form-foot{font-size:12px;color:var(--mute);margin:10px 0 0;line-height:1.6}
.form-done{text-align:center;padding:14px 4px}
.form-done .tick{width:48px;height:48px;line-height:48px;border-radius:50%;background:var(--ok);color:#fff;font-size:24px;margin:0 auto 10px}
.form-done h4{font-size:18px;margin-bottom:8px}.form-done p{font-size:14px}

/* section / lists */
.sec-hero{padding:34px 0 26px}
.sec-hero h1{font-size:34px;margin:8px 0 10px}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;padding-bottom:20px}
.card-grid.two{grid-template-columns:repeat(2,minmax(0,1fr))}
.card{display:flex;flex-direction:column;padding:20px;border:1px solid var(--line);border-radius:var(--r2);background:var(--panel);color:var(--ink);transition:.15s;min-width:0}
.card h3{font-size:17.5px;margin-bottom:6px}
.card p{font-size:14px;color:var(--ink-2);margin:0 0 12px;line-height:1.7;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card .more{margin-top:auto;font-size:13.5px;font-weight:700;color:var(--brand)}
.card:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--sh);color:var(--ink)}
.ftype{align-self:flex-start;font-size:11px;font-weight:700;letter-spacing:1px;padding:1px 8px;border-radius:3px;background:var(--brand);color:#fff;margin-bottom:10px}
.sec{padding:56px 0}
.sec-t{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;margin-bottom:22px;flex-wrap:wrap}
.sec-t h2{font-size:28px}
.sec-t p{margin:6px 0 0;color:var(--ink-2);max-width:680px}
.sec-t a{font-weight:700;font-size:14.5px;white-space:nowrap}

/* tools */
.tool-wrap{padding-top:18px;padding-bottom:60px;max-width:1000px}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:26px;border:1px solid var(--line);border-radius:var(--r2);padding:26px;background:var(--panel);margin:22px 0 34px;box-shadow:var(--sh)}
.calc.one{grid-template-columns:minmax(0,1fr)}
.calc>div{min-width:0}
.calc h3{font-size:16px;margin-bottom:12px}
.calc label{display:block;font-size:14px;font-weight:600;color:var(--ink-2);margin-bottom:12px}
.calc label small{display:block;font-weight:400;color:var(--mute);font-size:12.5px}
.calc .row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.calc textarea{min-height:210px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:14px;line-height:1.7}
.res{background:var(--res-bg);border-radius:var(--r2);padding:22px;color:var(--res-ink);min-width:0}
.res h3{color:var(--res-ink);opacity:.8}
.kv{display:flex;justify-content:space-between;gap:12px;align-items:baseline;padding:9px 0;border-bottom:1px solid var(--res-line);font-size:14.5px}
.kv:last-of-type{border:0}
.kv b{font-size:20px;color:var(--res-head);white-space:nowrap}
.kv.big b{font-size:34px;color:var(--res-accent)}
.verdict{margin:14px 0 0;font-size:14px;line-height:1.75;padding:12px 14px;border-radius:var(--r);background:var(--res-note)}
.gwrap{text-align:center;margin-bottom:6px}
.gauge{width:230px;max-width:100%}
.g-bg{fill:none;stroke:var(--res-line);stroke-width:16;stroke-linecap:round}
.g-arc{fill:none;stroke-width:16;stroke-linecap:round;transition:stroke-dasharray .35s}
.g-arc.lo{stroke:#E5484D}.g-arc.mid{stroke:#F5A400}.g-arc.hi{stroke:#2FB574}
.g-val{font-family:"DIN Alternate","Bahnschrift",Arial,sans-serif;font-size:44px;font-weight:700;color:var(--res-accent);margin-top:-62px;line-height:1}
.g-lab{font-size:12px;opacity:.75;margin:4px 0 12px}
.bars div.bar{height:8px;border-radius:99px;background:var(--res-line);margin:2px 0 10px;overflow:hidden}
.bars div.bar i{display:block;height:100%;background:var(--res-accent);border-radius:99px;transition:width .35s;width:0}
.res .btn{margin-top:14px}
#wf-svg svg,#pa-svg svg{width:100%;height:auto;display:block}
.w-total{fill:var(--head)}.w-loss{fill:#E5484D}.w-good{fill:#2FB574}.wax{stroke:var(--line-2);stroke-width:1}
.wl{font-size:12px;text-anchor:middle;fill:var(--ink-2)}.wv{font-size:12px;text-anchor:middle;fill:var(--head);font-weight:700}
.pb{fill:var(--line-2)}.pb.key{fill:var(--brand)}.pv{font-size:11px;text-anchor:middle;fill:var(--head);font-weight:700}.pl{font-size:11.5px;fill:var(--ink-2)}
.pc{fill:none;stroke:#E5484D;stroke-width:2}.pd{fill:#E5484D}.p80{stroke:#E5484D;stroke-dasharray:4 4;stroke-width:1;opacity:.6}.p80t{font-size:11px;fill:#E5484D}
.tool-btns{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.chk{display:flex!important;align-items:center;gap:8px}.chk input{width:16px!important;height:16px;margin:0!important;display:inline-block!important;-webkit-appearance:auto!important;appearance:auto!important;accent-color:var(--brand)}
.radio{display:flex;gap:8px;margin-bottom:14px}
.radio label{flex:1;margin:0!important;border:1.5px solid var(--line-2);border-radius:var(--r);padding:9px 12px;cursor:pointer;font-size:14px!important;display:flex!important;gap:8px;align-items:center;background:#fff}
.radio input{width:auto!important;margin:0!important;-webkit-appearance:auto!important;appearance:auto!important;accent-color:var(--brand)}

/* gate */
.gate-grid{display:grid;grid-template-columns:minmax(0,1fr) 400px;gap:48px;padding-top:22px;padding-bottom:64px;align-items:start}
.gate-l h1{font-size:32px;margin:8px 0 12px}
.gate-l h2{font-size:21px;margin:30px 0 12px}
.ticks{list-style:none;padding:0;margin:0}
.ticks li{position:relative;padding:9px 0 9px 30px;border-bottom:1px solid var(--line)}
.ticks li::before{content:"✓";position:absolute;left:2px;top:8px;color:var(--ok);font-weight:700}
.gate-r{position:sticky;top:86px}
.preview{border:1px solid var(--line);border-radius:var(--r2);overflow:hidden;margin-top:14px}
.preview table{min-width:480px;font-size:13px}

/* footer */
.ft{background:var(--ft-bg);color:var(--ft-ink);margin-top:40px;padding:48px 0 90px;font-size:14px}
.ft a{color:var(--ft-ink)}.ft a:hover{color:#fff}
.ft-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:24px;padding-bottom:30px;border-bottom:1px solid var(--ft-line)}
.ft-col h4{font-size:15px;margin-bottom:10px;color:#fff}.ft-col h4 a{color:#fff}.ft-col h4.mt{margin-top:18px}
.ft-col a{display:block;padding:3px 0;opacity:.78;font-size:13.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ft-col h4 a{opacity:1}
.ft-nap{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding:24px 0;line-height:1.9;opacity:.85;font-size:13.5px}
.ft-nap b{color:#fff}.ft-nap a{text-decoration:underline;text-underline-offset:3px}
.ft-bot{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:12.5px;opacity:.7;border-top:1px solid var(--ft-line);padding-top:16px}

/* float widget / mobile bar / modal / offer */
.fw{position:fixed;right:16px;bottom:96px;z-index:60;display:flex;flex-direction:column;gap:6px}
.fw>button,.fw>a{width:50px;height:50px;border-radius:var(--r2);border:1px solid var(--line);background:#fff;color:var(--head);font-size:12.5px;font-weight:700;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--sh);font-family:inherit}
.fw>a{background:var(--cta);color:var(--cta-ink);border-color:var(--cta)}
.fw-top{display:none!important}.fw-top[style*=flex]{display:flex!important}
.fw-pop{display:none;position:absolute;right:60px;top:0;background:#fff;border:1px solid var(--line);border-radius:var(--r2);padding:14px 16px;box-shadow:0 10px 30px rgba(0,0,0,.16);width:210px;text-align:center;color:var(--ink)}
.fw-pop.show{display:block}.fw-pop b{display:block;font-size:16px;color:var(--head)}.fw-pop span{display:block;font-size:12.5px;color:var(--mute)}
.mbar{display:none}
.modal{display:none;position:fixed;inset:0;z-index:100;background:rgba(10,14,18,.62);overflow-y:auto;padding:24px 14px}
.modal.show{display:flex}
.modal-box{background:#fff;border-radius:12px;max-width:440px;width:100%;margin:auto;padding:28px 26px 22px;position:relative;color:var(--ink)}
.modal-box h3{font-size:21px;padding-right:30px}.modal-sub{font-size:14px;color:var(--ink-2);margin:6px 0 16px}
.modal-x{position:absolute;right:12px;top:8px;border:0;background:transparent;font-size:28px;line-height:1;cursor:pointer;color:var(--mute);padding:6px 10px}
.offer{position:fixed;left:20px;bottom:20px;z-index:55;background:#fff;border:1px solid var(--line);border-left:4px solid var(--cta);border-radius:var(--r2);padding:14px 40px 14px 16px;box-shadow:0 12px 34px rgba(0,0,0,.18);max-width:300px;transform:translateY(140%);transition:transform .35s}
.offer.show{transform:none}.offer span{font-size:12px;color:var(--mute);display:block}.offer b{display:block;color:var(--head);margin:2px 0 10px;font-size:15px}
.offer button{position:absolute;right:8px;top:4px;border:0;background:transparent;font-size:20px;cursor:pointer;color:var(--mute)}
.nf{text-align:center;padding:90px 20px}.nf h1{font-size:80px;color:var(--brand)}

/* responsive */
@media (max-width:1100px){.nav a{padding:8px 7px;font-size:14px}.hd-tel{display:none}.ft-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media (max-width:960px){
  .art-grid,.gate-grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .side,.gate-r{position:static}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .burger{display:block}
  .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--hd-bg);flex-direction:column;padding:8px 16px 16px;border-bottom:1px solid var(--hd-line);box-shadow:0 14px 30px rgba(0,0,0,.18);margin:0}
  .nav.open{display:flex}.nav a{padding:12px 8px;font-size:16px;border-bottom:1px solid var(--hd-line);border-radius:0}
  .hd-r .btn{display:none}
  .hd-r{margin-left:auto}
}
@media (max-width:640px){
  body{font-size:15.5px}
  .wrap{padding:0 16px}
  .hd-in{height:58px;gap:10px}.brand-tx i{display:none}.brand-tx b{font-size:17px}
  .art-hd h1,.gate-l h1,.sec-hero h1{font-size:25px}
  .prose{font-size:16px}.prose h2{font-size:21px;margin-top:36px}.prose h3{font-size:17.5px}
  .toc ol{columns:1}
  .card-grid,.card-grid.two,.rel-grid{grid-template-columns:minmax(0,1fr)}
  .calc{grid-template-columns:minmax(0,1fr);padding:18px;gap:18px}
  .cta-band{flex-direction:column;align-items:flex-start;padding:20px}
  .ft{padding-bottom:110px}.ft-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ft-nap{grid-template-columns:minmax(0,1fr);gap:14px}
  .ft-nap,.ft-nap a{overflow-wrap:anywhere}
  .fw{display:none}
  .mbar{display:grid;grid-template-columns:1fr 1fr 1.3fr;position:fixed;left:0;right:0;bottom:0;z-index:70;background:#fff;border-top:1px solid var(--line);box-shadow:0 -6px 20px rgba(0,0,0,.08);padding-bottom:env(safe-area-inset-bottom)}
  .mbar a{padding:13px 4px;text-align:center;font-size:14.5px;font-weight:700;color:var(--head);border-right:1px solid var(--line)}
  .mbar a.hot{background:var(--cta);color:var(--cta-ink);border:0}
  .pn-row{flex-direction:column}.sec{padding:40px 0}.sec-t h2{font-size:23px}
  .kv.big b{font-size:28px}
}

/* theme — 设备效率网 shebeixiaolv.cn : paper + emerald + signal orange, gauge motif */
:root{
  --bg:#FBFAF6;--panel:#FFFFFF;--ink:#1D2A24;--ink-2:#44524B;--mute:#7A857F;--head:#0C2B20;
  --brand:#0A7A55;--link:#0A6A4A;--link-h:#E2571C;--link-line:rgba(10,122,85,.3);
  --cta:#F26B1D;--cta-h:#DB5A10;--cta-ink:#FFFFFF;--cta-sh:rgba(242,107,29,.35);
  --line:#E4E2D8;--line-2:#CFCDBF;--zebra:#FCFBF8;--th-bg:#EEF4EF;--th-ink:#0C2B20;
  --code-bg:#EEF4EF;--code-ink:#0A5A40;
  --cap-bg:#F0F7F2;--cap-line:#BFDCCB;--formula-bg:#0C2B20;--formula-ink:#E9F6EE;
  --eg-bg:#FFF9EF;--eg-line:#F2DDB5;--warn:#C8371B;--warn-bg:#FDF1EE;--warn-line:#F2C8BE;--ok:#1F9D62;
  --band-bg:#0C2B20;--band-ink:#CFE3D8;--band-head:#FFFFFF;--band-k:#FFB37E;
  --res-bg:#0C2B20;--res-ink:#CFE3D8;--res-head:#FFFFFF;--res-accent:#7CE3B1;--res-line:rgba(255,255,255,.13);--res-note:rgba(255,255,255,.07);
  --hd-bg:rgba(251,250,246,.96);--hd-line:#E4E2D8;--hd-ink:#0C2B20;--hd-mute:#7A857F;
  --ft-bg:#0A2219;--ft-ink:#B9CCC2;--ft-line:rgba(255,255,255,.1);
  --focus:rgba(10,122,85,.16);--r:8px;--r2:12px;--sh:0 8px 26px rgba(12,43,32,.08);
}
.topbar{display:none}
.hd{backdrop-filter:saturate(1.4) blur(8px)}
.nav a:hover{background:#EEF4EF;color:var(--brand)}
.nav a.on{color:var(--brand);font-weight:700;box-shadow:inset 0 -2px 0 var(--brand);border-radius:0}
.kicker{background:#E6F2EB;padding:2px 10px;border-radius:99px}
.prose h2{padding-left:14px;border-left:5px solid var(--brand)}
.card{border-top:3px solid var(--line)}
.card:hover{border-top-color:var(--brand)}

/* home */
.hero{background:radial-gradient(1100px 500px at 85% -10%,#DFF0E6 0,transparent 60%),var(--bg);padding:54px 0 60px;border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:50px;align-items:center}
.hero h1{font-size:44px;line-height:1.25;letter-spacing:.5px;margin:14px 0 16px}
.hero h1 em{font-style:normal;color:var(--brand);background:linear-gradient(transparent 62%,#FFD9BF 62%)}
.hero .lede{font-size:18px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0 18px}
.hero-pts{list-style:none;padding:0;margin:0;display:flex;gap:6px 20px;flex-wrap:wrap;font-size:14px;color:var(--ink-2)}
.hero-pts li::before{content:"●";color:var(--brand);font-size:9px;vertical-align:2px;margin-right:6px}
.hero-calc{background:#fff;border:1px solid var(--line);border-radius:18px;box-shadow:0 24px 60px rgba(12,43,32,.14);padding:22px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px}
.hero-calc h3{grid-column:1/-1;font-size:15px;color:var(--mute);font-weight:600;margin:0}
.hero-calc label{display:block;font-size:12.5px;color:var(--ink-2);font-weight:600;margin-bottom:8px}
.hero-calc input{display:block;width:100%;margin-top:3px;padding:8px 10px;border:1.5px solid var(--line-2);border-radius:8px;font-size:15px;font-family:inherit;outline:0}
.hero-calc input:focus{border-color:var(--brand)}
.hero-calc .res{padding:16px}
.hero-calc .gauge{width:190px}.hero-calc .g-val{font-size:38px;margin-top:-52px}
.hero-calc .kv{font-size:13px;padding:5px 0}.hero-calc .kv b{font-size:16px}
.hero-calc .verdict{font-size:12.5px;padding:9px 11px;margin-top:8px}
.strip{background:#0C2B20;color:#CFE3D8}
.strip .wrap{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0}
.strip .wrap>div{padding:22px 20px;border-left:1px solid rgba(255,255,255,.1)}
.strip .wrap>div:first-child{border:0;padding-left:0}
.strip b{display:block;font-size:26px;color:#7CE3B1;font-family:"DIN Alternate","Bahnschrift",Arial,sans-serif}
.strip span{font-size:13px;line-height:1.5;display:block}
.formula-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.fcard{background:#fff;border:1px solid var(--line);border-radius:var(--r2);padding:22px;position:relative;color:var(--ink)}
.fcard .n{font-family:"DIN Alternate","Bahnschrift",Arial,sans-serif;font-size:40px;color:#CFE3D8;position:absolute;right:18px;top:8px}
.fcard h3{font-size:18px;margin-bottom:4px}.fcard code{display:block;margin:10px 0;padding:8px 10px;font-size:13px}
.fcard p{font-size:14px;color:var(--ink-2);margin:0 0 8px}.fcard:hover{border-color:var(--brand);color:var(--ink)}
.loss-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}
.loss{background:#fff;border:1px solid var(--line);border-radius:var(--r2);padding:16px 14px;color:var(--ink);font-size:13px;line-height:1.6}
.loss b{display:block;font-size:15.5px;color:var(--head);margin-bottom:4px}.loss i{font-style:normal;display:inline-block;font-size:11px;font-weight:700;padding:0 7px;border-radius:99px;margin-bottom:8px}
.loss .a{background:#FDE8E4;color:#B93418}.loss .p{background:#FFF1D6;color:#9A6300}.loss .q{background:#E1EEFB;color:#1F5FA8}
.loss:hover{border-color:var(--brand)}
.alt{background:#F3F1E9;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.qa-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}
.qa-list a{display:flex;justify-content:space-between;gap:10px;padding:13px 0;border-bottom:1px solid var(--line);color:var(--head);font-weight:600}
.qa-list a::after{content:"→";color:var(--brand)}.qa-list a:hover{color:var(--brand)}
.ind-chips{display:flex;flex-wrap:wrap;gap:10px}
.ind-chips a{padding:9px 18px;border:1px solid var(--line-2);border-radius:99px;background:#fff;color:var(--head);font-weight:600;font-size:15px}
.ind-chips a:hover{border-color:var(--brand);color:var(--brand)}
.final{background:#0C2B20;color:#CFE3D8;border-radius:20px;padding:40px;display:grid;grid-template-columns:minmax(0,1fr) 400px;gap:40px;align-items:center}
.final h2{color:#fff;font-size:28px;margin-bottom:10px}.final .side-card{margin:0}
.final ul{padding-left:20px;margin:14px 0 0}
@media (max-width:960px){.hero-grid,.final{grid-template-columns:minmax(0,1fr)}.hero h1{font-size:34px}.loss-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.formula-row{grid-template-columns:minmax(0,1fr)}.strip .wrap{grid-template-columns:repeat(2,minmax(0,1fr))}.strip .wrap>div:nth-child(3){border-left:0;padding-left:0}}
@media (max-width:640px){.hero{padding:30px 0 36px}.hero h1{font-size:28px}.hero .lede{font-size:16px}.hero-calc{grid-template-columns:minmax(0,1fr);padding:16px}.loss-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.qa-list{grid-template-columns:minmax(0,1fr)}.final{padding:24px 18px;border-radius:14px}.strip .wrap>div{padding:16px 12px}.strip b{font-size:22px}}