/* ===== 设计令牌 ===== */
:root{
  --ink:#14181c;
  --ink2:#40484f;
  --ink3:#79838c;
  --paper:#f7f8f9;
  --white:#fdfdfd;
  --line:#dfe4e8;
  --line2:#eceff1;
  --brand:#0a57a7;
  --brand-deep:#06407c;
  --tint:#eaf1f9;
  --warn:#a6430f;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --num:"Barlow","Noto Sans SC",sans-serif;
  --pad:clamp(18px,5vw,20px);
}

/* ===== 基础 ===== */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:var(--brand);text-decoration:none}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:-.01em}
p{margin:0}
figure{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit}
.num{font-family:var(--num);font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.wrap{width:min(1200px,calc(100% - 2 * var(--pad)));margin:0 auto}
main section[id],main .demo-band[id]{scroll-margin-top:86px}

/* ===== 归属顶栏：回到官网 ===== */
.topbar{background:var(--brand-deep);color:#cfe0f1}
.topbar-in{width:min(1200px,calc(100% - 2 * var(--pad)));margin:0 auto;height:34px;display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:12.5px;letter-spacing:.02em}
.topbar-in span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.topbar-in a{color:#fff;display:inline-flex;align-items:center;gap:6px;white-space:nowrap;flex:0 0 auto;padding:2px 0;border-bottom:1px solid rgba(255,255,255,.4)}
.topbar-in a:hover{border-bottom-color:#fff}
.topbar-in a svg{width:11px;height:11px;flex:0 0 auto}

/* ===== 页头 ===== */
.site-head{position:sticky;top:0;z-index:60;background:var(--paper);border-bottom:1px solid var(--line)}
.head-in{width:min(1200px,calc(100% - 2 * var(--pad)));margin:0 auto;display:flex;align-items:center;gap:22px;min-height:70px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-logo{display:block;height:50px;width:auto}
.brand-mark{width:26px;height:26px;flex:0 0 auto}
.brand-txt{display:flex;flex-direction:column;line-height:1.2}
.brand-txt b{font-size:14px;letter-spacing:.02em}
.brand-txt span{font-family:var(--num);font-size:10px;letter-spacing:.16em;color:var(--ink3)}
.nav{margin-left:auto;display:flex;gap:20px;align-items:center;overflow-x:auto;-ms-overflow-style:none;scrollbar-width:none;padding:6px 0}
.nav::-webkit-scrollbar{display:none}
.nav a{font-size:13px;color:var(--ink2);white-space:nowrap;border-bottom:1px solid transparent;padding-bottom:2px;display:inline-block;min-height:34px;line-height:34px}
.nav a:hover{color:var(--brand);border-bottom-color:var(--brand)}

/* ===== 通用区块 ===== */
.sect{padding:56px 0;border-top:1px solid var(--line)}
.sect-head{max-width:740px}
h2{font-size:clamp(24px,3.3vw,34px);line-height:1.28}
.lead2{margin-top:14px;font-size:15.5px;line-height:1.85;color:var(--ink2);max-width:33em}
.eyebrow{display:flex;align-items:center;gap:10px;font-size:12.5px;color:var(--ink3);letter-spacing:.06em;margin-bottom:14px}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--brand)}

/* ===== 首屏 ===== */
.hero{padding:36px 0 0}
.hero-grid{display:grid;gap:34px;grid-template-columns:1fr}
.hero-copy{min-width:0}
h1{font-size:clamp(30px,7.2vw,54px);line-height:1.1;letter-spacing:-.02em;margin-top:12px}
.model-line{display:flex;align-items:baseline;gap:10px;margin-top:16px;flex-wrap:wrap}
.model-line b{font-family:var(--num);font-size:23px;font-weight:600;letter-spacing:.06em;color:var(--brand)}
.model-line span{font-size:12px;color:var(--ink3)}
.lead{margin-top:20px;font-size:16px;line-height:1.85;color:var(--ink2);max-width:33em}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px 20px;margin-top:26px}
.btn-primary{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 22px;background:var(--brand);color:#fff;font-size:14px;font-weight:500;letter-spacing:.02em;border:1px solid var(--brand);transition:background .18s}
.btn-primary:hover{background:var(--brand-deep);border-color:var(--brand-deep)}
.btn-ghost{display:inline-flex;align-items:center;min-height:46px;padding:0 2px;font-size:14px;color:var(--brand-deep);border-bottom:1px solid var(--brand)}
.btn-ghost:hover{color:var(--brand)}

.plate{margin-top:32px;border:1px solid var(--line);background:var(--white)}
.plate-head{display:flex;justify-content:space-between;gap:12px;padding:9px 14px;font-size:11px;color:var(--ink3);letter-spacing:.07em}
.plate-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--line2);border-top:1px solid var(--line2)}
.plate-cell{background:var(--white);padding:12px 14px 13px;min-width:0}
.plate-cell i{display:block;font-style:normal;font-size:11px;color:var(--ink3);letter-spacing:.04em}
.plate-cell b{display:block;margin-top:3px;font-family:var(--num);font-size:19px;font-weight:600;letter-spacing:.01em}
.plate-cell b em{font-style:normal;font-family:var(--sans);font-size:12px;font-weight:400;color:var(--ink2);letter-spacing:0}

.hero-media{background:var(--white);border:1px solid var(--line2);align-self:start}
.hero-media img{width:100%;max-width:520px;max-height:620px;object-fit:contain;margin:0 auto}
.hero-media figcaption{padding:10px 14px 11px;border-top:1px solid var(--line2);font-size:11.5px;line-height:1.65;color:var(--ink3)}

.hero-strip{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;border-top:1px solid var(--line);margin-top:40px;padding:15px 0 0;font-size:12.5px;color:var(--ink3)}
.hero-strip b{font-weight:500;color:var(--ink2)}
.hero-strip .dot{width:3px;height:3px;background:var(--line);flex:0 0 auto}

/* ===== 电压偏差来源 ===== */
.prob-grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:34px;grid-template-columns:1fr}
.prob-item{background:var(--paper);padding:20px 18px 24px;min-width:0}
.prob-item figure{height:44px;margin-bottom:16px}
.prob-item figure svg{width:100%;height:44px}
.prob-item h3{font-size:15px;line-height:1.4}
.prob-item p{margin-top:8px;font-size:13.5px;line-height:1.8;color:var(--ink2)}
.prob-foot{margin-top:20px;font-size:12px;color:var(--ink3);line-height:1.7;max-width:44em}

/* ===== 稳压演示 ===== */
.demo-band{background:var(--tint);border-top:1px solid var(--line);padding:56px 0}
.demo-grid{display:grid;gap:26px;margin-top:34px;grid-template-columns:1fr}
.demo-ctrl{min-width:0}
.seg{display:inline-flex;background:var(--white);border:1px solid var(--brand)}
.seg button{appearance:none;border:0;background:transparent;color:var(--brand-deep);font-size:13px;padding:0 16px;min-height:42px;cursor:pointer;transition:background .15s,color .15s}
.seg button[aria-pressed="true"]{background:var(--brand);color:#fff}
.read{margin-top:20px;display:flex;align-items:baseline;gap:8px}
.read b{font-family:var(--num);font-size:44px;font-weight:600;line-height:1}
.read span{font-size:13px;color:var(--ink2)}
.rng-label{display:flex;justify-content:space-between;font-size:11.5px;color:#4b5f75;margin-top:16px;letter-spacing:.03em}
input[type="range"]{width:100%;height:34px;margin:4px 0 0;accent-color:var(--brand);cursor:pointer}
.mini{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-top:22px;background:rgba(6,64,124,.16);border-top:1px solid rgba(6,64,124,.16);border-bottom:1px solid rgba(6,64,124,.16)}
.mini div{background:var(--tint);padding:12px 0 13px;min-width:0}
.mini i{display:block;font-style:normal;font-size:11px;color:#4b5f75;letter-spacing:.04em}
.mini b{display:block;margin-top:2px;font-family:var(--num);font-size:18px;font-weight:600;color:var(--brand-deep)}
.tip{margin-top:18px;font-size:12px;line-height:1.7;color:#41566d}

.demo-viz{background:var(--white);border:1px solid rgba(6,64,124,.15);padding:22px 20px 24px;min-width:0}
.viz-head{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:11.5px;color:var(--ink3);letter-spacing:.05em}
.st{display:inline-flex;align-items:center;gap:6px;font-size:12px;letter-spacing:0;padding:3px 9px;border:1px solid var(--brand);color:var(--brand-deep);background:rgba(10,87,167,.06);white-space:nowrap}
.st.warn{border-color:var(--warn);color:var(--warn);background:rgba(166,67,15,.07)}
.st::before{content:"";width:5px;height:5px;background:currentColor;flex:0 0 auto}
.rail{position:relative;height:78px;margin:22px 0 0}
.rail-line{position:absolute;left:0;right:0;top:38px;height:1px;background:var(--line)}
.rail-band{position:absolute;top:32px;height:13px;background:rgba(10,87,167,.12);border-left:1px solid rgba(10,87,167,.45);border-right:1px solid rgba(10,87,167,.45)}
.rail-rated{position:absolute;top:20px;height:37px;width:2px;background:var(--brand)}
.rail-rated-label{position:absolute;top:0;transform:translateX(-50%);font-family:var(--num);font-size:12px;color:var(--brand-deep);white-space:nowrap}
.rail-mark{position:absolute;top:33px;width:0;height:0;border-left:7px solid transparent;border-right:7px solid transparent;border-top:9px solid var(--ink);transform:translateX(-50%)}
.rail-mark-label{position:absolute;top:52px;transform:translateX(-50%);font-family:var(--num);font-size:13px;font-weight:600;color:var(--ink);white-space:nowrap}
.rail-end{position:absolute;top:12px;font-size:11px;color:var(--ink3);transform:translateX(-50%);white-space:nowrap}
.viz-foot{margin-top:26px;display:flex;flex-wrap:wrap;gap:10px 26px;font-size:12px;color:var(--ink3)}
.viz-foot span b{font-family:var(--num);color:var(--ink2);font-weight:600}

/* ===== 通用工具 ===== */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ===== 方案对比 ===== */
.chain-grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:34px;grid-template-columns:1fr}
.chain-card{background:var(--paper);padding:22px 20px 20px;min-width:0;display:flex;flex-direction:column;gap:16px}
.chain-card.ours{background:var(--white);box-shadow:inset 0 2px 0 var(--brand)}
.chain-card h3{font-size:14px;line-height:1.4;display:flex;flex-direction:column;gap:4px}
.chain-card h3 span{font-size:11.5px;font-weight:400;color:var(--ink3)}
.chain{display:flex;flex-wrap:wrap;align-items:center;gap:6px}
.chip{border:1px solid var(--line);background:var(--white);padding:6px 8px;font-size:11.5px;line-height:1.4;color:var(--ink2)}
.chip.brand{border-color:rgba(10,87,167,.45);background:rgba(10,87,167,.06);color:var(--brand-deep)}
.chip.node{border-style:dashed;background:transparent;color:var(--ink3)}
.arw{color:#b3bcc4;font-size:11px;line-height:1}
.chain-note{font-size:12px;line-height:1.75;color:var(--ink3);margin-top:auto;padding-top:12px;border-top:1px solid var(--line2)}

.tbl-wrap{overflow-x:auto;margin-top:34px;-webkit-overflow-scrolling:touch}
.cmp{width:100%;min-width:700px;border-collapse:collapse;font-size:13px;table-layout:fixed}
.cmp th,.cmp td{padding:13px 12px;text-align:left;vertical-align:top;line-height:1.7;border-bottom:1px solid var(--line)}
.cmp thead th{font-size:11.5px;font-weight:500;color:var(--ink3);border-bottom:1px solid var(--ink)}
.cmp thead th.ours{color:var(--brand-deep);font-weight:600}
.cmp tbody th{font-weight:500;font-size:12.5px;color:var(--ink);background:#eef1f3}
.cmp td.ours{background:rgba(10,87,167,.05)}
.scroll-hint{font-size:11.5px;color:var(--ink3);margin-top:9px}
.rec .cmp{min-width:0}

/* ===== 结构与安装 ===== */
.struct-grid{display:grid;gap:28px;margin-top:34px;grid-template-columns:1fr}
.struct-fig{background:var(--white);border:1px solid var(--line2)}
.struct-fig img{width:100%;height:auto}
.struct-fig figcaption{padding:10px 14px 11px;border-top:1px solid var(--line2);font-size:11.5px;line-height:1.65;color:var(--ink3)}
.pts{border-top:1px solid var(--line)}
.pts li{padding:13px 0;border-bottom:1px solid var(--line)}
.pts li b{display:block;font-size:14px;font-weight:600}
.pts li p{margin-top:3px;font-size:12.5px;line-height:1.75;color:var(--ink2)}

.bypass{display:grid;gap:24px;margin-top:44px;grid-template-columns:1fr}
.bypass-fig{background:var(--white);border:1px solid var(--line2);padding:16px;overflow-x:auto}
.bypass-fig svg{min-width:400px;width:100%;height:auto;display:block}
.bypass-txt h3{font-size:16px}
.bypass-txt p{margin-top:10px;font-size:13px;line-height:1.8;color:var(--ink2)}
.bypass-txt p.small{font-size:11.5px;color:var(--ink3);line-height:1.7}

.install{display:grid;gap:26px;margin-top:44px;grid-template-columns:1fr}
.install-fig{background:var(--white);border:1px solid var(--line2)}
.install-fig img{width:100%;max-width:420px;height:auto;margin:0 auto}
.install-fig figcaption{padding:10px 14px 11px;border-top:1px solid var(--line2);font-size:11.5px;line-height:1.65;color:var(--ink3)}
.install-txt h3{font-size:16px}
.install-txt p{margin-top:10px;font-size:13px;line-height:1.8;color:var(--ink2)}
.check{margin-top:18px;border-top:1px solid var(--line)}
.check li{display:grid;grid-template-columns:80px 1fr;gap:10px;padding:9px 0;border-bottom:1px solid var(--line);font-size:12.5px;line-height:1.7}
.check li b{font-weight:500;color:var(--ink)}
.check li span{color:var(--ink2)}

/* ===== 效率与损耗 ===== */
.eff-grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:34px;grid-template-columns:1fr}
.eff-card{background:var(--white);padding:16px 14px 10px;min-width:0}
.eff-card h3{font-size:13.5px;font-weight:600;line-height:1.5}
.eff-card h3 span{display:block;font-weight:400;font-size:11.5px;color:var(--ink3)}
.chart{width:100%;height:246px}
.eff-note{margin-top:18px;font-size:12px;line-height:1.75;color:var(--ink3);max-width:54em}

@media (min-width:640px){
  .install-txt .check li{grid-template-columns:96px 1fr}
}
@media (min-width:900px){
  .chain-grid{grid-template-columns:repeat(3,1fr)}
  .struct-grid{grid-template-columns:1.1fr .9fr;gap:44px;align-items:center}
  .bypass{grid-template-columns:1.12fr .88fr;gap:44px;align-items:center}
  .install{grid-template-columns:.85fr 1.15fr;gap:44px;align-items:center}
}
@media (min-width:860px){
  .eff-grid{grid-template-columns:repeat(2,1fr)}
}

/* ===== 规格参数 ===== */
.spec-facts{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:34px;grid-template-columns:repeat(2,1fr)}
.fact{background:var(--white);padding:12px 14px 13px;min-width:0}
.fact i{display:block;font-style:normal;font-size:11px;color:var(--ink3);letter-spacing:.04em}
.fact b{display:block;margin-top:3px;font-size:14px;font-weight:600;line-height:1.5}
.fact b.num{font-size:17px}
.spec-tbl{margin-top:22px}
.spec{width:100%;min-width:820px;border-collapse:collapse;font-size:13px;table-layout:fixed}
.spec th,.spec td{padding:12px 10px;text-align:center;border-bottom:1px solid var(--line);border-right:1px solid var(--line2);line-height:1.6}
.spec thead th{font-size:11.5px;font-weight:500;color:var(--ink3);border-bottom:1px solid var(--ink);background:var(--paper)}
.spec tbody th{text-align:left;font-weight:500;font-size:12.5px;background:#eef1f3;border-right:1px solid var(--line);color:var(--ink)}
.spec td{font-family:var(--num);font-size:13.5px;font-weight:500;background:var(--white)}
.spec td small{font-family:var(--sans);font-weight:400;font-size:11px;color:var(--ink3)}
.spec td{white-space:nowrap}
.spec tbody th{position:sticky;left:0;z-index:2}
.spec thead th:first-child{position:sticky;left:0;z-index:3}
.spec tbody tr:last-child td,.spec tbody tr:last-child th{border-bottom:1px solid var(--line)}
.spec-note{margin-top:18px;font-size:12px;line-height:1.75;color:var(--ink3);max-width:58em}

/* ===== 应用场景 ===== */
.scene-grid{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:34px;grid-template-columns:1fr}
.scene{background:var(--paper);padding:20px 18px 22px;min-width:0}
.scene h3{font-size:14px;line-height:1.4}
.scene p{margin-top:7px;font-size:12.5px;line-height:1.75;color:var(--ink2)}
.pos-tbl{margin-top:26px}

/* ===== 选型 ===== */
.steps{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:34px;grid-template-columns:1fr}
.step{background:var(--paper);padding:20px 18px 22px;min-width:0}
.step em{font-style:normal;font-family:var(--num);font-size:12px;letter-spacing:.12em;color:var(--brand)}
.step h3{font-size:14px;margin-top:8px}
.step p{margin-top:6px;font-size:12.5px;line-height:1.75;color:var(--ink2)}
.rec{display:grid;gap:30px;margin-top:44px;grid-template-columns:1fr}
.rec-list li{padding:12px 0;border-bottom:1px solid var(--line)}
.rec-list li b{font-size:13.5px;font-weight:600}
.rec-list li p{margin-top:3px;font-size:12.5px;line-height:1.7;color:var(--ink2)}
.rec-in h3{font-size:16px}
.rec-in p{margin-top:10px;font-size:13px;line-height:1.8;color:var(--ink2)}

/* ===== 联系 ===== */
.contact{background:var(--ink);color:#fff;padding:56px 0}
.contact h2{color:#fff}
.contact .lead2{color:#b6c0c8}
.contact-grid{display:grid;gap:32px;margin-top:34px;grid-template-columns:1fr}
.req{border-top:1px solid rgba(255,255,255,.16);margin-top:8px}
.req li{display:flex;gap:12px;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.16);font-size:13px;line-height:1.7;color:#d3dae0}
.req li b{flex:0 0 auto;font-family:var(--num);font-size:12px;font-weight:500;letter-spacing:.08em;color:#7ea9d4}
.contact-box{border:1px dashed rgba(255,255,255,.3);padding:20px 18px 22px;align-self:start}
.contact-box h3{font-size:13px;font-weight:500;letter-spacing:.02em}
.contact-box dl{margin:16px 0 0;display:grid;gap:12px}
.contact-box dt{font-size:11px;letter-spacing:.06em;color:#8b969f}
.contact-box dd{margin:3px 0 0;font-family:var(--num);font-size:14px;color:#e6ebef}
.contact-box dd a{color:#e6ebef;border-bottom:1px solid rgba(255,255,255,.35);padding-bottom:1px}
.contact-box dd a:hover{color:#fff;border-bottom-color:#fff}
.contact-box p{margin-top:18px;font-size:11.5px;line-height:1.75;color:#8b969f}

/* ===== 参数说明 ===== */
.notes{padding:40px 0 48px;border-top:1px solid var(--line)}
.notes h3{font-size:12px;font-weight:500;letter-spacing:.08em;color:var(--ink3)}
.notes ol{margin-top:12px;display:grid;gap:7px;max-width:66em}
.notes li{display:flex;gap:8px;font-size:11.5px;line-height:1.75;color:var(--ink3)}
.notes li i{font-style:normal;font-family:var(--num);color:var(--brand);flex:0 0 auto}

/* ===== 页脚 ===== */
.site-foot{border-top:1px solid var(--line);padding:24px 0 34px;font-size:11.5px;color:var(--ink3)}
.foot-in{display:flex;flex-wrap:wrap;gap:10px 26px;align-items:center;justify-content:space-between;line-height:1.7}
.foot-in a{color:var(--ink2)}

@media (min-width:620px){
  .spec-facts{grid-template-columns:repeat(4,1fr)}
}
@media (min-width:700px){
  .scene-grid{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:760px){
  .steps{grid-template-columns:repeat(2,1fr)}
  .rec{grid-template-columns:1fr 1.15fr;gap:44px;align-items:start}
}
@media (min-width:900px){
  .contact{padding:92px 0}
  .contact-grid{grid-template-columns:1.05fr .95fr;gap:60px;align-items:start}
}
@media (min-width:1060px){
  .scene-grid{grid-template-columns:repeat(4,1fr)}
  .steps{grid-template-columns:repeat(4,1fr)}
}

/* ===== 窄屏：对比表转为分组列表 ===== */
@media (max-width:759px){
  .stack{display:block;min-width:0}
  .stack thead{display:none}
  .stack tbody{display:block}
  .stack tbody tr{display:block;padding:13px 0 15px;border-bottom:1px solid var(--line)}
  .stack tbody tr:last-child{border-bottom:0}
  .stack tbody th{display:block;background:none;border:0;padding:0 0 7px;font-size:12.5px;font-weight:500;color:var(--ink3)}
  .stack tbody td{display:grid;grid-template-columns:76px 1fr;gap:10px;padding:4px 0;border:0;background:none;font-size:12.5px;line-height:1.7;text-align:left}
  .stack tbody td::before{content:attr(data-label);color:var(--ink3);font-size:11px;letter-spacing:.02em;white-space:nowrap}
  .stack tbody td.ours{background:none}
}

/* ===== 窄屏细节 ===== */
@media (max-width:639px){
  .nav a:nth-child(3),.nav a:nth-child(4),.nav a:nth-child(6){display:none}
  .nav{gap:13px}
  .nav a{font-size:12.5px}
  .brand-logo{height:36px}
  .head-in{min-height:62px;gap:12px}
  .hero-media img{max-height:470px}
}
@media (max-width:430px){
  .nav a:nth-child(1),.nav a:nth-child(7){display:none}
}

/* ===== 动效 ===== */
@media (prefers-reduced-motion:no-preference){
  .hero-copy{animation:rise .65s cubic-bezier(.22,.7,.3,1) both}
  .hero-media{animation:rise .75s .1s cubic-bezier(.22,.7,.3,1) both}
}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}

/* ===== 断点 ===== */
@media (min-width:620px){
  .plate-grid{grid-template-columns:repeat(3,1fr)}
}
@media (min-width:760px){
  .prob-grid{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:900px){
  .sect{padding:96px 0}
  .demo-band{padding:88px 0}
}
@media (min-width:940px){
  .demo-grid{grid-template-columns:340px 1fr;gap:52px;align-items:start}
  .demo-viz{padding:30px 32px 32px}
}
@media (min-width:1000px){
  .hero-grid{grid-template-columns:1fr 505px;gap:60px;align-items:start}
  .hero{padding:52px 0 0}
  .demo-grid{grid-template-columns:360px 1fr}
}
@media (min-width:1080px){
  .prob-grid{grid-template-columns:repeat(4,1fr)}
}