/* 落地页样式。联众拓海 VI：联众蓝做主色与按钮，拓海绿只做色条与图形，深海蓝做暗区底，浅海蓝做亮区底，雾灰写说明；bom 识别色只做小点缀。 */
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:root{
  --navy:#052E4C;--blue:#054B96;--green:#32A082;--pale:#E6EDF5;--slate:#5E6E7A;--bom:#2E6B4F;
  --ink:#0B1F33;--line:#D3DCE6;--white:#fff;
  --wrap:1240px;--gutter:clamp(20px,4vw,40px);
  --sec-pad:clamp(72px,9vw,136px);
  --ff:Montserrat,"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;overflow-x:clip;-webkit-text-size-adjust:100%}
body{margin:0;font-family:var(--ff);color:var(--ink);background:var(--white);font-size:17px;line-height:1.7;overflow-x:clip}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue)}
h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.01em;line-height:1.15}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
figure{margin:0}
dl,dd,dt{margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.br-wide{display:none}
@media(min-width:900px){.br-wide{display:inline}}

/* 文字层级 */
.eyebrow{font-size:13px;letter-spacing:.18em;font-weight:600;color:var(--blue);text-transform:uppercase;margin-bottom:18px}
.eyebrow-light{color:#9FD9C6}
.h2{font-size:clamp(30px,3.8vw,54px);max-width:22em;margin-bottom:22px}
.lead{font-size:clamp(17px,1.35vw,20px);color:var(--slate);max-width:40em;margin-bottom:clamp(36px,4vw,56px)}
.sec-navy .lead,.band .lead{color:#C9D6E3}
.num{font-family:Montserrat,var(--ff);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.03em}
.num-inline{font-family:Montserrat,var(--ff);font-variant-numeric:tabular-nums;color:var(--blue)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:54px;padding:0 30px;border-radius:8px;font-weight:600;font-size:16px;text-decoration:none;border:1.5px solid transparent;transition:background .2s,color .2s,border-color .2s,transform .2s var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--blue);color:#fff;border-color:var(--blue)}
.btn-primary:hover{background:#083D7A;border-color:#083D7A}
.btn-ghost{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.55);backdrop-filter:blur(6px)}
.btn-ghost:hover{background:rgba(255,255,255,.16);border-color:#fff}
.btn-light{background:#fff;color:var(--navy);border-color:#fff}
.btn-light:hover{background:var(--pale)}
a:focus-visible,button:focus-visible{outline:3px solid var(--green);outline-offset:3px}

/* 区块节奏 */
.sec{padding:var(--sec-pad) 0;position:relative}
.sec-pale{background:var(--pale)}
.sec-white{background:#fff}
.sec-navy{background:var(--navy);color:#fff}
.sec-navy .h2{color:#fff}
.sec-cta{margin-top:clamp(36px,4vw,56px)}

/* 滚动淡入 */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.in{opacity:1;transform:none}
.pain-grid .reveal:nth-child(2),.work-steps .reveal:nth-child(2),.band-stats .reveal:nth-child(2){transition-delay:.12s}
.pain-grid .reveal:nth-child(3),.work-steps .reveal:nth-child(3),.band-stats .reveal:nth-child(3){transition-delay:.24s}

/* 顶栏 */
.topbar{position:absolute;top:0;left:0;right:0;z-index:20;padding:22px 0}
.topbar-row{display:flex;align-items:center;justify-content:space-between;gap:24px}
.topbar-brand img{width:clamp(150px,14vw,208px);height:auto}
.topbar-nav{display:flex;align-items:center;gap:clamp(18px,2.4vw,36px)}
.topbar-nav a{color:#fff;text-decoration:none;font-size:15px;font-weight:600;letter-spacing:.04em;opacity:.9}
.topbar-nav a:hover{opacity:1}
.topbar-login{border:1px solid rgba(255,255,255,.55);border-radius:6px;padding:9px 16px}
@media(max-width:720px){.topbar-nav a:not(.topbar-login){display:none}}

/* B1 首屏 */
.hero{position:relative;min-height:100svh;display:flex;flex-direction:column;justify-content:flex-end;color:#fff;background:var(--navy);overflow:hidden;isolation:isolate}
.hero-media{position:absolute;inset:-12% 0 0;z-index:-2;will-change:transform}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center}
.hero-shade{position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(5,46,76,.55) 0%,rgba(5,46,76,.35) 35%,rgba(5,46,76,.82) 75%,var(--navy) 100%)}
.hero-body{width:100%;padding-top:clamp(140px,22vh,220px);padding-bottom:clamp(72px,9vh,110px)}
.hero-title{font-size:clamp(36px,6.6vw,96px);line-height:1.04;max-width:12em;text-shadow:0 2px 24px rgba(0,0,0,.25)}
.hero-lead{font-size:clamp(17px,1.5vw,22px);line-height:1.65;max-width:34em;color:#E3EBF3;margin-top:clamp(22px,2.6vw,34px)}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:clamp(28px,3.2vw,44px)}
.hero-stats{display:flex;flex-wrap:wrap;gap:clamp(28px,5vw,72px);margin-top:clamp(44px,6vh,72px);padding-top:28px;border-top:1px solid rgba(255,255,255,.22)}
.hero-stats dt{font-size:13px;letter-spacing:.14em;color:#AFC4D6;margin-bottom:6px}
.hero-stats dd{display:flex;align-items:baseline;gap:8px}
.hero-stats .num{font-size:clamp(44px,5.4vw,80px);line-height:1}
.hero-stats .unit{font-size:18px;color:#C9D6E3}
.hero-scroll{position:absolute;right:var(--gutter);bottom:28px;color:#AFC4D6;text-decoration:none;font-size:12px;letter-spacing:.16em;display:flex;align-items:center;gap:8px}
.hero-scroll span{display:inline-block;transform:rotate(90deg)}
@media(max-width:720px){.hero-scroll{display:none}.hero-shade{background:linear-gradient(180deg,rgba(5,46,76,.45) 0%,rgba(5,46,76,.3) 30%,rgba(5,46,76,.86) 70%,var(--navy) 100%)}}

/* B2 痛点 */
.pain-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,2.6vw,36px);margin-top:clamp(36px,4vw,56px)}
.pain{background:#fff;border-radius:12px;overflow:hidden;box-shadow:0 1px 0 var(--line)}
.pain-photo{aspect-ratio:4/3;overflow:hidden}
.pain-photo img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.pain:hover .pain-photo img{transform:scale(1.04)}
.pain h3{font-size:22px;padding:24px 26px 10px;position:relative}
.pain h3::before{content:"";position:absolute;left:0;top:30px;width:4px;height:24px;background:var(--green);border-radius:0 2px 2px 0}
.pain p{padding:0 26px 28px;color:var(--slate);font-size:16px}
@media(max-width:900px){.pain-grid{grid-template-columns:1fr}.pain{display:grid;grid-template-columns:140px 1fr;grid-template-rows:auto 1fr}.pain-photo{grid-row:1/3;aspect-ratio:auto;height:100%}.pain h3{font-size:19px;padding:20px 20px 6px}.pain h3::before{display:none}.pain p{padding:0 20px 20px;font-size:15px}}

/* B3 做法 */
.work-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(24px,3vw,48px);margin-top:clamp(40px,5vw,64px)}
.step-no{font-family:Montserrat,var(--ff);font-weight:700;font-size:14px;letter-spacing:.2em;color:var(--green);display:block;margin-bottom:12px}
.work-steps h3{font-size:24px;margin-bottom:10px}
.work-steps p{color:#C9D6E3;font-size:16px}
.triptych{display:grid;grid-template-columns:minmax(0,1.2fr) auto minmax(0,1fr) auto minmax(0,1fr);gap:clamp(14px,2vw,28px);align-items:center;margin-top:clamp(48px,6vw,88px);padding:clamp(20px,2.6vw,36px);background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:16px}
.triptych[hidden]{display:none}
.tri-img{border-radius:10px;overflow:hidden;aspect-ratio:4/3;background:#0B3A5E}
.tri-img img{width:100%;height:100%;object-fit:cover}
.tri-img-white{background:#fff;aspect-ratio:3/2}
.tri-img-white img{object-fit:contain;padding:8px}
.tri-cell figcaption{margin-top:12px;font-size:14px;color:#C9D6E3;display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.tri-tag{display:inline-block;font-size:11px;letter-spacing:.16em;font-weight:700;color:var(--navy);background:#9FD9C6;border-radius:4px;padding:3px 8px}
.tri-arrow{font-size:34px;color:var(--green);line-height:1}
.spec-card{background:#fff;color:var(--ink);border-radius:10px;padding:22px 24px;border-top:4px solid var(--green)}
.spec-card strong{display:block;font-size:19px;margin:14px 0 10px;line-height:1.35}
.spec-card p{font-size:14px;color:var(--slate);white-space:pre-line}
.spec-meta{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:12px;font-weight:600;color:var(--navy)!important}
.spec-meta span:empty{display:none}
@media(max-width:900px){.triptych{grid-template-columns:1fr;gap:18px}.tri-arrow{transform:rotate(90deg);justify-self:center}}
.feature-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:clamp(36px,4vw,56px)}
.feature-chips li{font-size:14px;color:#E3EBF3;border:1px solid rgba(255,255,255,.28);border-radius:999px;padding:8px 16px}

/* B4 案例网格 */
.case-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:clamp(16px,2vw,28px)}
.case-grid[hidden]{display:none}
.case-card{display:block;text-decoration:none;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;transition:transform .35s var(--ease),box-shadow .35s var(--ease)}
.case-card:hover{transform:translateY(-4px);box-shadow:0 18px 40px rgba(5,46,76,.14)}
.case-cover{aspect-ratio:4/3;background:var(--navy);position:relative;overflow:hidden}
.case-cover img{width:100%;height:100%;object-fit:cover;transition:transform 1.2s var(--ease)}
.case-card:hover .case-cover img{transform:scale(1.05)}
.case-cover.is-text img{display:none}
.case-cover.is-text::after{content:attr(data-name);position:absolute;inset:0;display:flex;align-items:flex-end;padding:22px;color:#fff;font-weight:700;font-size:20px;line-height:1.3;background:linear-gradient(160deg,#0B3A5E,var(--navy))}
.case-cover.is-text::before{content:"";position:absolute;left:22px;top:22px;width:28px;height:4px;background:var(--green)}
.case-body{padding:16px 18px 18px}
.case-body strong{display:block;font-size:16px;line-height:1.4;overflow-wrap:anywhere}
.case-body small{display:block;margin-top:6px;color:var(--slate);font-size:13px;font-variant-numeric:tabular-nums}

/* B5 单品对照 */
.compare-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(18px,2.4vw,32px)}
.compare-grid[hidden]{display:none}
.cmp{background:#fff;border-radius:14px;overflow:hidden;border:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto auto}
.cmp-scene,.cmp-white{aspect-ratio:4/3;overflow:hidden;position:relative}
.cmp-scene img{width:100%;height:100%;object-fit:cover}
.cmp-white{background:#fff;border-left:1px solid var(--line)}
.cmp-white img{width:100%;height:100%;object-fit:contain;padding:10px}
.cmp-scene .tri-tag,.cmp-white .tri-tag{position:absolute;left:12px;top:12px;background:rgba(5,46,76,.85);color:#fff}
.cmp-body{grid-column:1/3;padding:18px 22px 22px;border-top:1px solid var(--line)}
.cmp-body strong{display:block;font-size:18px;line-height:1.35}
.cmp-body .cmp-spec{font-size:14px;color:var(--slate);margin-top:6px;white-space:pre-line}
.cmp-body .cmp-meta{display:flex;flex-wrap:wrap;gap:6px 16px;margin-top:10px;font-size:14px;font-weight:600;color:var(--navy)}
.cmp-body .cmp-label{display:block;margin-top:10px;font-size:12px;color:var(--slate)}
.cmp-body .cmp-label::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--bom);margin-right:8px;vertical-align:middle}
@media(max-width:720px){.compare-grid{grid-template-columns:1fr}}

/* B6 合作步骤 */
.steps-layout{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(280px,.8fr);gap:clamp(36px,6vw,96px);align-items:start}
.flow li{display:grid;grid-template-columns:64px 1fr;gap:12px;padding:26px 0;border-top:1px solid var(--line)}
.flow li:last-child{border-bottom:1px solid var(--line)}
.flow .step-no{color:var(--blue);margin:6px 0 0}
.flow h3{font-size:22px;margin-bottom:6px}
.flow p{color:var(--slate);font-size:16px}
.intake{background:var(--navy);color:#fff;border-radius:14px;padding:clamp(26px,3vw,40px);position:sticky;top:24px}
.intake h3{font-size:20px;margin-bottom:18px}
.intake ul{margin-bottom:26px}
.intake li{padding:10px 0 10px 24px;border-top:1px solid rgba(255,255,255,.14);font-size:15px;position:relative;color:#E3EBF3}
.intake li::before{content:"";position:absolute;left:3px;top:14px;width:6px;height:11px;border:solid var(--green);border-width:0 2px 2px 0;transform:rotate(45deg)}
@media(max-width:900px){.steps-layout{grid-template-columns:1fr}.intake{position:static}}

/* B7 系统截图 */
.screen{background:var(--navy);border-radius:16px;overflow:hidden;box-shadow:0 30px 80px rgba(5,46,76,.22)}
.screen-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;background:#0B3A5E}
.screen-bar span{width:10px;height:10px;border-radius:50%;background:rgba(255,255,255,.28)}
.screen-bar em{margin-left:12px;font-style:normal;font-size:12px;color:#AFC4D6;font-family:Montserrat,var(--ff);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.screen img{width:100%}
.screen figcaption{padding:14px 18px;font-size:13px;color:#AFC4D6}

/* B8 覆盖范围与数字 */
.band{position:relative;color:#fff;background:var(--navy);overflow:hidden;padding:var(--sec-pad) 0 0;isolation:isolate}
.band-media{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:-2}
.band-shade{position:absolute;inset:0;z-index:-1;background:linear-gradient(180deg,rgba(5,46,76,.78),rgba(5,46,76,.9))}
.band .h2{color:#fff}
.band-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,48px);margin-top:clamp(36px,4vw,56px)}
.band-stats .num{font-size:clamp(48px,7vw,112px);line-height:1}
.band-stats dt{font-size:15px;color:#C9D6E3;margin-top:8px;padding-top:14px;border-top:1px solid rgba(255,255,255,.22)}
.marquee{margin-top:clamp(56px,7vw,100px);padding:22px 0;border-top:1px solid rgba(255,255,255,.18);overflow:hidden;white-space:nowrap}
.marquee[hidden]{display:none}
.marquee-track{display:inline-flex;gap:0;animation:marquee 60s linear infinite;will-change:transform}
.marquee-track span{display:inline-block;padding:0 28px;font-size:clamp(18px,2vw,26px);font-weight:600;color:#E3EBF3}
.marquee-track span::before{content:"·";color:var(--green);margin-right:28px}
.band:hover .marquee-track{animation-play-state:paused}
@keyframes marquee{to{transform:translate3d(-50%,0,0)}}
@media(max-width:720px){.band-stats{grid-template-columns:1fr;gap:28px}}

/* B9 互动出口 */
.contact-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(18px,2.4vw,32px);margin-top:clamp(36px,4vw,56px)}
.contact-card{border-radius:14px;padding:clamp(26px,3vw,40px)}
.contact-client{background:var(--pale)}
.contact-supplier{background:var(--navy);color:#fff}
.contact-card h3{font-size:24px;margin-bottom:12px}
.contact-card p{font-size:16px;margin-bottom:24px}
.contact-client p{color:var(--slate)}
.contact-supplier p{color:#C9D6E3}
.contact-card small{display:block;margin-top:12px;color:var(--slate);font-size:13px}
.contact-supplier small{color:#AFC4D6;font-family:Montserrat,var(--ff)}
.contact-supplier .btn{max-width:100%;overflow-wrap:anywhere;text-align:left;padding:14px 22px;min-height:0}
.contact-client .btn{max-width:100%;overflow-wrap:anywhere;text-align:left;padding:14px 22px;min-height:0}
.dm-list li{display:grid;grid-template-columns:96px 1fr auto;gap:12px;align-items:baseline;padding:14px 0;border-top:1px solid rgba(255,255,255,.16);font-size:15px}
.dm-list span{color:#AFC4D6;font-size:13px;letter-spacing:.06em}
.dm-list strong{font-weight:600;overflow-wrap:anywhere}
.dm-list em{font-style:normal;color:var(--green);font-weight:700;white-space:nowrap}
.contact-links{margin-top:32px;display:flex;gap:14px;align-items:center;font-size:15px}
.contact-links span{color:var(--slate)}
@media(max-width:900px){.contact-grid{grid-template-columns:1fr}.dm-list li{grid-template-columns:84px 1fr;gap:4px 12px}.dm-list em{grid-column:2}}

/* B10 页脚 */
.foot{background:var(--navy);color:#C9D6E3;padding:clamp(56px,7vw,96px) 0 40px;font-size:14px}
.foot-top{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:20px;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.16)}
.foot-top img{width:clamp(170px,16vw,234px)}
.foot-tag{color:#fff;letter-spacing:.14em;font-weight:600}
.foot-sys{padding:36px 0}
.foot-label{font-size:12px;letter-spacing:.16em;color:#AFC4D6;margin-bottom:18px}
.foot-sys ul{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.foot-sys a{display:block;text-decoration:none;color:#fff;padding:18px 20px;border:1px solid rgba(255,255,255,.16);border-radius:10px;transition:border-color .2s}
.foot-sys a:hover{border-color:var(--green)}
.foot-sys strong{display:block;font-size:18px}
.foot-sys span{display:block;font-family:Montserrat,var(--ff);font-size:13px;color:#9FD9C6;margin:4px 0 8px}
.foot-sys small{display:block;color:#C9D6E3;font-size:13px;line-height:1.6}
.foot-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px;padding-top:28px;border-top:1px solid rgba(255,255,255,.16)}
.foot-bottom a{color:#fff;text-decoration:none}
.foot-bottom span{margin:0 10px;color:#AFC4D6}
@media(max-width:900px){.foot-sys ul{grid-template-columns:1fr}}

/* 减少动态效果：全部关闭 */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .marquee-track{animation:none;flex-wrap:wrap;white-space:normal}
  .btn,.case-card,.pain-photo img,.case-cover img{transition:none}
  .hero-media{will-change:auto}
}

@media(max-width:720px){.topbar-row{gap:10px}.topbar-brand img{width:128px}.topbar-nav{gap:12px}.topbar-nav .topbar-login{padding:8px 10px}.topbar-nav a.topbar-guide{display:block;font-size:13px}.topbar-nav .topbar-login{font-size:13px}}