:root{
  --navy:#0F2A43;--navy-d:#0A1C2E;--ink:#16202A;--muted:#5A6673;
  --line:#DCE2E8;--wash:#F4F6F8;--white:#fff;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:#fff;color:var(--ink);
  font:400 16px/1.82 "Microsoft YaHei","PingFang SC","Hiragino Sans GB","Source Han Sans SC",
  "Noto Sans CJK SC","Helvetica Neue",Arial,sans-serif;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--navy);text-decoration:none}
a:hover{color:#1D4E77;text-decoration:underline;text-underline-offset:3px}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:14px;top:14px;z-index:99;background:#fff;padding:10px 16px;border:1px solid var(--navy)}
:focus-visible{outline:2px solid var(--navy);outline-offset:3px}
h1,h2,h3,h4{color:var(--navy);margin:0}
p{margin:0 0 14px}
.num{font-variant-numeric:tabular-nums}

/* header */
.head{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.bar{display:flex;align-items:center;justify-content:space-between;gap:24px;
  min-height:74px;padding-top:8px;padding-bottom:8px;flex-wrap:wrap}
.logo img{height:52px;width:auto}
.nav{display:flex;align-items:center;gap:28px;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.nav a{font-size:15.5px;color:var(--ink);padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--navy);text-decoration:none;border-bottom-color:var(--line)}
.nav a[aria-current="page"]{color:var(--navy);font-weight:700;border-bottom-color:var(--navy)}
.head-right{display:flex;align-items:center;gap:16px}
.head-tel{font-weight:700;font-size:15px;color:var(--navy);white-space:nowrap}
.btn{display:inline-block;background:var(--navy);color:#fff;font-weight:700;
  padding:11px 20px;font-size:15px;border:1px solid var(--navy);white-space:nowrap}
.btn:hover{background:var(--navy-d);color:#fff;text-decoration:none}
.btn-lg{padding:14px 28px;font-size:16px}
.btn-ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.55)}
.btn-ghost:hover{background:rgba(255,255,255,.08);color:#fff}

/* hero */
.hero{background:var(--navy);color:#fff;border-bottom:1px solid var(--navy-d)}
.hero .grid{display:grid;grid-template-columns:1.05fr .95fr;align-items:stretch;min-height:520px}
.hero .txt{padding:72px 56px 64px 0;display:flex;flex-direction:column;justify-content:center}
.kicker{font-size:11.5px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:rgba(255,255,255,.62);margin:0 0 22px}
.hero h1{color:#fff;font-size:46px;line-height:1.24;font-weight:700;letter-spacing:.01em;margin:0 0 22px}
.hero .lede{font-size:17px;line-height:1.9;color:rgba(255,255,255,.8);max-width:36em;margin:0 0 30px}
.hero .fig{position:relative;overflow:hidden;min-height:320px}
.hero .fig img{width:100%;height:100%;object-fit:cover}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.hero-sm .txt{padding:60px 0 52px;max-width:none}
.hero-sm .grid{grid-template-columns:1fr;min-height:0}
.hero-sm h1{font-size:38px;margin-bottom:16px}
.crumb{font-size:13px;color:rgba(255,255,255,.55);margin:0 0 18px}
.crumb a{color:rgba(255,255,255,.72)}

/* key figures */
.kpi{border-bottom:1px solid var(--line);background:#fff}
.kpi .grid{display:grid;grid-template-columns:repeat(4,1fr)}
.kpi .cell{padding:30px 26px 30px 0;border-right:1px solid var(--line)}
.kpi .cell:last-child{border-right:0}
.kpi .n{display:block;font-size:30px;font-weight:700;color:var(--navy);line-height:1.2}
.kpi .l{display:block;font-size:13px;color:var(--muted);margin-top:6px;line-height:1.6}

/* sections */
section{padding:80px 0}
.bg-wash{background:var(--wash)}
.sec-head{max-width:54em;margin-bottom:38px}
.eyebrow{font-size:11.5px;font-weight:700;letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);margin:0 0 14px}
h2{font-size:30px;line-height:1.36;font-weight:700;letter-spacing:.01em;margin:0 0 12px}
.sec-head p{color:var(--muted);margin:0}
h3{font-size:18px;line-height:1.5;font-weight:700;margin:0 0 10px}

/* 认证条 */
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:34px}
.trust div{background:#fff;padding:24px 22px}
.trust b{display:block;color:var(--navy);font-size:15px;margin-bottom:6px}
.trust span{font-size:13.5px;color:var(--muted);line-height:1.7}

/* 场景卡 */
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line)}
.scene{background:#fff;padding:26px 24px 24px;display:flex;flex-direction:column}
.scene .no{font-size:11px;font-weight:700;letter-spacing:.16em;color:var(--muted)}
.scene h3{font-size:19px;margin:10px 0 8px}
.scene p{font-size:14px;color:var(--muted);line-height:1.75;margin:0 0 12px}
.scene .meta{margin-top:auto;font-size:13px;color:var(--navy);border-top:1px solid var(--line);padding-top:12px}

/* 场景明细行 */
.srow{display:grid;grid-template-columns:220px 1fr;gap:40px;padding:34px 0;border-top:1px solid var(--line)}
.srow .name h3{font-size:20px;margin-bottom:6px}
.srow .name .no{font-size:11px;font-weight:700;letter-spacing:.16em;color:var(--muted)}
.srow dl{display:grid;grid-template-columns:repeat(2,1fr);gap:0 40px;margin:0}
.srow dt{font-size:12.5px;color:var(--muted);padding-top:6px}
.srow dd{margin:0;padding:2px 0 14px;font-size:14.5px;color:var(--ink)}

/* 图像组 */
.pics{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.pics figure{margin:0;border:1px solid var(--line);background:#fff}
.pics img{width:100%;aspect-ratio:4/3;object-fit:cover}
.pics figcaption{padding:12px 14px;font-size:13px;color:var(--muted);border-top:1px solid var(--line)}
.pics.two{grid-template-columns:repeat(2,1fr)}

/* 流程 */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);margin-top:34px}
.step{background:#fff;padding:26px 22px}
.step .no{font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--muted)}
.step h3{font-size:16.5px;margin:10px 0 8px}
.step p{font-size:13.5px;color:var(--muted);margin:0;line-height:1.75}

/* 表格 */
.scroll{overflow-x:auto;margin-top:26px}
.hint{display:none;font-size:13px;color:var(--muted);margin:10px 0 0}
.tbl-proc th:nth-child(1),.tbl-proc td:nth-child(1){width:46px}
.tbl-proc th:nth-child(2){width:186px}
.tbl-proc th:nth-child(4){width:178px}
table{width:100%;border-collapse:collapse;font-size:14.5px;background:#fff;min-width:640px}
caption{text-align:left;font-size:13px;color:var(--muted);padding:0 0 10px}
th{text-align:left;font-weight:700;font-size:13px;color:#fff;background:var(--navy);padding:12px 16px}
td{border-bottom:1px solid var(--line);padding:13px 16px;vertical-align:top;color:var(--ink)}
tbody th{background:#fff;color:var(--navy);border-bottom:1px solid var(--line)}
tbody tr:nth-child(even) td{background:#FAFBFC}

/* FAQ */
.qgroup{margin-top:40px}
.qgroup h2{font-size:20px;padding-bottom:12px;border-bottom:1px solid var(--navy)}
.qa{padding:22px 0;border-bottom:1px solid var(--line)}
.qa h3{font-size:16.5px;margin:0 0 8px}
.qa p{font-size:14.5px;color:var(--muted);margin:0;line-height:1.85}

/* 联系 */
.contact{display:grid;grid-template-columns:1.1fr .9fr;gap:56px}
.clist dt{font-size:12.5px;color:var(--muted);letter-spacing:.04em;margin-top:18px}
.clist dd{margin:4px 0 0;font-size:17px;color:var(--ink);font-weight:700}
.clist dd.small{font-size:14.5px;font-weight:400;color:var(--muted);line-height:1.8}

/* CTA */
.cta{background:var(--navy);color:#fff;padding:52px 48px;display:flex;align-items:center;
  justify-content:space-between;gap:36px;flex-wrap:wrap}
.cta h2{color:#fff;font-size:26px;margin-bottom:10px}
.cta p{color:rgba(255,255,255,.76);margin:0}
.cta .btn{background:#fff;color:var(--navy);border-color:#fff}
.cta .btn:hover{background:#E8EDF2;color:var(--navy)}

/* footer */
.foot{background:var(--navy-d);color:rgba(255,255,255,.6);padding:54px 0 30px;font-size:14px;line-height:1.9}
.fgrid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.1fr;gap:34px}
.foot strong{display:block;color:#fff;font-size:14.5px;margin-bottom:10px}
.foot a{color:rgba(255,255,255,.6)}
.foot a:hover{color:#fff}
.foot .flogo{height:48px;width:auto;margin-bottom:14px;filter:brightness(0) invert(1)}
.copy{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;
  font-size:12.5px;color:rgba(255,255,255,.4)}

@media (max-width:980px){
  .hero .grid{grid-template-columns:1fr}
  .hero .txt{padding:56px 0 44px}
  .hero .fig{min-height:260px;max-height:320px}
  .kpi .grid{grid-template-columns:repeat(2,1fr)}
  .kpi .cell{border-right:0;border-bottom:1px solid var(--line);padding:24px 20px 24px 0}
  .scenes,.pics,.pics.two,.trust{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .srow{grid-template-columns:1fr;gap:16px}
  .contact{grid-template-columns:1fr;gap:32px}
  .fgrid{grid-template-columns:1fr 1fr}
}
@media (max-width:680px){
  .wrap{padding:0 20px}
  .hero h1{font-size:29px}
  .hero-sm h1{font-size:25px}
  .hero .lede,.hero-sm .lede{font-size:15px}
  .hero .txt{padding:44px 0 38px}
  section{padding:52px 0}
  h2{font-size:23px}
  .kpi .n{font-size:24px}
  .scenes,.pics,.pics.two,.trust,.steps,.fgrid{grid-template-columns:1fr}
  table{min-width:560px}
  .hint{display:block}
  .logo img{height:44px}
  .bar{min-height:62px;gap:8px 14px}
  .nav{order:3;flex:1 0 100%;gap:16px;padding-bottom:6px}
  .nav a{font-size:14px}
  .head-tel{display:none}
  .btn{padding:9px 14px;font-size:14px}
  .cta{padding:34px 22px}
  .cta h2{font-size:21px}
  .srow dl{grid-template-columns:1fr}
  .clist dd{font-size:16px}
}

/* 交付档案：3 列事实卡 */
.trust-3{grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:900px){.trust-3{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:600px){.trust-3{grid-template-columns:minmax(0,1fr)}}

/* 场景页材质示意 */
.scene-hero{margin:0;padding:0}
.scene-hero img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover}
.scene-hero figcaption{font-size:12px;line-height:1.6;color:#8a8a8a;padding:10px 0 0}
@media (max-width:767px){.scene-hero img{aspect-ratio:4/3}}

/* 六类场景用料条 */
.strip6 {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 12px;
  margin-top: 24px;
}
.strip6 figure {
  margin: 0;
}
.strip6 img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}
.strip6 figcaption {
  margin-top: 6px;
  font-size: 11px;
  line-height: 1.45;
  color: var(--muted);
}
@media (max-width: 900px) {
  .strip6 {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (max-width: 560px) {
  .strip6 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 图文条：给文字密集页增加视觉节奏 */
.imgrow {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}
.imgrow.cols-4 {
  grid-template-columns: repeat(4, 1fr);
}
.imgrow.cols-3 {
  grid-template-columns: repeat(3, 1fr);
}
.imgrow figure {
  margin: 0;
}
.imgrow img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}
.imgrow figcaption {
  margin-top: 7px;
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
}
@media (max-width: 860px) {
  .imgrow.cols-4,
  .imgrow.cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 520px) {
  .imgrow.cols-3 {
    grid-template-columns: repeat(1, 1fr);
  }
}

.imgrow.cols-2 {
  grid-template-columns: repeat(2, 1fr);
}
.imgrow.cols-1 {
  grid-template-columns: 1fr;
  max-width: 720px;
}
@media (max-width: 520px) {
  .imgrow.cols-2 {
    grid-template-columns: 1fr;
  }
}

.imgrow img.nat {
  aspect-ratio: auto;
  object-fit: contain;
  height: auto;
}

/* 只有 3 格的整行卡片：窄屏直接竖排，避免出现空网格 */
@media (max-width:900px){.fit3{grid-template-columns:minmax(0,1fr)}}