/* roulang page: index */
:root{
  --bg:#F4F8FC;
  --surface:#FFFFFF;
  --primary:#2B74B8;
  --primary-dark:#1D5A91;
  --primary-soft:#E8F2FB;
  --line:#D7E3EE;
  --line-card:#E4EEF6;
  --input-line:#C5D6E6;
  --text:#1A2B3C;
  --muted:#5C6E80;
  --accent:#2F8F9D;
  --warn:#C47B2B;
  --dark:#1B2633;
  --footer:#223244;
  --shadow-card:0 10px 28px rgba(27,58,92,.08);
  --shadow-hover:0 16px 36px rgba(27,58,92,.12);
  --radius:10px;
  --radius-btn:8px;
  --container:1200px;
  --header-top:40px;
  --header-main:76px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:88px}
html,body{margin:0;padding:0}
body{
  font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.8;font-weight:400;color:var(--text);background:var(--bg);
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s ease,background .2s ease,border-color .2s ease}
a:hover{color:var(--primary-dark)}
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
button,input,select,textarea{font-family:inherit}
button{cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
h1{font-size:40px;line-height:1.25;font-weight:700}
h2{font-size:28px;line-height:1.35;font-weight:700}
h3{font-size:19px;line-height:1.45;font-weight:600}
.skip-link{position:absolute;left:12px;top:-48px;z-index:10000;background:var(--primary);color:#fff;padding:8px 14px;border-radius:var(--radius-btn)}
.skip-link:focus{top:12px}
.container{width:min(100% - 40px,var(--container));margin:0 auto}
.site-header{position:relative;z-index:1000}
.nav-top{height:var(--header-top);background:var(--primary-soft);color:var(--muted);font-size:13px;display:flex;align-items:center}
.nav-top .container{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:12px}
.nav-top a{color:var(--text)}
.nav-top a:hover{color:var(--primary)}
.nav-top-left{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.nav-top-mid{text-align:center}
.nav-top-right{text-align:right}
.nav-top-cta{font-weight:600;color:var(--primary)!important;border-bottom:2px solid var(--primary);padding-bottom:1px}
.nav-main{height:var(--header-main);background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;transition:box-shadow .2s ease}
.nav-main.is-sticky{position:fixed;top:0;left:0;right:0;box-shadow:0 8px 24px rgba(27,58,92,.08)}
.nav-main .container{display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);min-width:0}
.logo:hover{color:var(--text)}
.logo-mark{width:42px;height:42px;border-radius:8px;flex:0 0 42px;background:var(--primary);display:grid;place-items:center;color:#fff}
.logo-mark svg{width:24px;height:24px}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-name{font-size:18px;font-weight:700}
.logo-sub{font-size:12px;color:var(--muted);margin-top:3px}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-links a{position:relative;color:var(--text);font-size:15px;font-weight:600;padding:10px 11px;border-radius:6px}
.nav-links a:hover{color:var(--primary);background:var(--primary-soft)}
.nav-links a.is-active{color:var(--primary)}
.nav-links a.is-active::after{content:"";position:absolute;left:11px;right:11px;bottom:4px;height:2px;background:var(--primary)}
.menu-toggle{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:8px;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.menu-toggle span{display:block;width:18px;height:2px;background:var(--text)}
.nav-drawer{display:none;position:fixed;inset:0;background:rgba(27,38,51,.46);z-index:1200}
.nav-drawer.is-open{display:block}
.nav-drawer-panel{position:absolute;top:0;right:0;width:min(86vw,360px);height:100%;background:#fff;padding:24px 20px 32px;display:flex;flex-direction:column;gap:6px;box-shadow:-12px 0 32px rgba(27,58,92,.12);overflow:auto}
.nav-drawer-panel a{color:var(--text);font-weight:600;padding:12px 12px 12px 16px;border-left:3px solid transparent}
.nav-drawer-panel a:hover,.nav-drawer-panel a.is-active{color:var(--primary);background:var(--primary-soft);border-left-color:var(--primary)}
body.menu-open{overflow:hidden}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 20px;border-radius:var(--radius-btn);font-size:15px;font-weight:600;line-height:1.2;border:2px solid transparent;transition:background .2s ease,border-color .2s ease,color .2s ease,transform .2s ease,box-shadow .2s ease}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover,.btn-primary:active{background:var(--primary-dark);border-color:var(--primary-dark);color:#fff}
.btn-ghost{background:transparent;color:var(--primary);border-color:var(--primary)}
.btn-ghost:hover{background:var(--primary-soft);color:var(--primary-dark);border-color:var(--primary-dark)}
.btn-light{background:#fff;color:var(--primary);border-color:#fff}
.btn-light:hover{background:var(--primary-soft);color:var(--primary-dark)}
.badge{display:inline-flex;align-items:center;background:var(--primary-soft);color:var(--primary-dark);font-size:13px;line-height:1.4;padding:4px 10px;border-radius:6px;font-weight:600}
.badge-accent{background:rgba(47,143,157,.12);color:var(--accent)}
.badge-warn{background:rgba(196,123,43,.12);color:var(--warn)}
.hero{position:relative;overflow:hidden;background:#1B2633}
.hero-viewport{position:relative;min-height:620px;height:clamp(560px,78vh,720px)}
.hero-slides{position:absolute;inset:0}
.hero-slide{position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .55s ease,visibility .55s ease}
.hero-slide.is-active{opacity:1;visibility:visible;z-index:1}
.hero-slide img{width:100%;height:100%;object-fit:cover}
.hero-panel{position:absolute;z-index:2;left:0;top:0;bottom:0;width:min(560px,48%);background:rgba(29,90,145,.92);color:#fff;display:flex;align-items:center}
.hero-panel-inner{padding:48px 44px}
.hero-kicker{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.hero-kicker span{background:rgba(255,255,255,.12);color:#fff;font-size:12px;padding:4px 8px;border-radius:4px}
.hero h1,.hero-title{font-size:40px;line-height:1.25;margin-bottom:14px;color:#fff;font-weight:700}
.hero-lead{font-size:16px;line-height:1.8;color:rgba(255,255,255,.9);margin-bottom:8px}
.hero-metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0 22px;padding:12px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);border-radius:10px}
.hero-metrics b{display:block;font-variant-numeric:tabular-nums;font-size:22px;line-height:1.2}
.hero-metrics span{display:block;font-size:12px;color:rgba(255,255,255,.75);margin-top:4px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-nav{position:absolute;z-index:3;bottom:24px;right:24px;display:flex;align-items:center;gap:10px}
.hero-arrow,.hero-pause{width:44px;height:44px;border-radius:8px;border:1px solid rgba(255,255,255,.3);background:rgba(27,38,51,.45);color:#fff}
.hero-arrow:hover,.hero-pause:hover{background:var(--primary)}
.hero-dots{display:flex;gap:8px}
.hero-dot{width:10px;height:10px;border-radius:50%;border:0;background:rgba(255,255,255,.4);padding:0}
.hero-dot.is-active{background:#fff}
.section{padding:96px 0;position:relative}
.section-white{background:#fff}
.section-soft{background:var(--primary-soft)}
.section-head{max-width:780px;margin-bottom:36px}
.section-head h2{margin-bottom:12px}
.section-head p{color:var(--muted)}
.section-kicker{color:var(--accent);font-size:13px;font-weight:600;letter-spacing:.06em;margin-bottom:8px}
.grid-bg{position:relative}
.grid-bg::before{content:"";position:absolute;inset:0;pointer-events:none;opacity:.04;background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);background-size:48px 48px}
.band-points{background:var(--primary-soft);padding:0}
.band-inner{display:grid;grid-template-columns:repeat(3,1fr)}
.band-item{display:flex;gap:16px;padding:36px 28px;border-right:1px solid var(--line)}
.band-item:last-child{border-right:0}
.band-no{font-variant-numeric:tabular-nums;font-size:28px;font-weight:700;color:var(--primary);line-height:1}
.band-item h3{margin-bottom:8px}
.band-item p{color:var(--muted);font-size:15px}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.split-media img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow-card);border:1px solid var(--line-card)}
.feature-list{margin:18px 0 22px;display:grid;gap:10px}
.feature-list li{display:flex;gap:10px;align-items:flex-start}
.feature-list li::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent);margin-top:9px;flex:0 0 8px}
.param-table{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line-card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-card);font-size:14px}
.param-table th,.param-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line)}
.param-table th{width:38%;background:var(--primary-soft);font-weight:600}
.param-table tr:last-child th,.param-table tr:last-child td{border-bottom:0}
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:18px;position:relative}
.timeline::before{content:"";position:absolute;left:6%;right:6%;top:78px;height:2px;background:var(--line)}
.step-card{background:#fff;border:1px solid var(--line-card);border-radius:var(--radius);box-shadow:var(--shadow-card);overflow:hidden;position:relative;z-index:1;transition:transform .2s ease,box-shadow .2s ease}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.step-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.step-body{padding:16px}
.step-index{font-size:12px;color:var(--primary);font-weight:700;margin-bottom:6px}
.step-body p{color:var(--muted);font-size:14px;margin-top:8px}
.aisle{margin-top:28px;background:#fff;border:1px solid var(--line-card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-card)}
.aisle h3{margin-bottom:14px}
.aisle-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:6px}
.cell{height:28px;border-radius:4px;background:var(--primary-soft);border:1px solid var(--line)}
.cell.pick{background:rgba(47,143,157,.22);border-color:var(--accent)}
.cell.warn{background:rgba(196,123,43,.18);border-color:var(--warn)}
.cell.path{background:var(--primary);opacity:.45}
.aisle-legend{display:flex;gap:16px;flex-wrap:wrap;margin-top:12px;font-size:13px;color:var(--muted)}
.dot{width:10px;height:10px;border-radius:2px;display:inline-block;margin-right:6px;vertical-align:middle}
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:#fff;border:1px solid var(--line-card);border-radius:var(--radius);box-shadow:var(--shadow-card);padding:24px;transition:transform .2s ease,box-shadow .2s ease}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.card-icon{width:44px;height:44px;border:1.5px solid var(--primary);border-radius:8px;display:grid;place-items:center;margin-bottom:14px;color:var(--primary)}
.card p{color:var(--muted);font-size:15px;margin-top:8px}
.card .result{margin-top:12px;color:var(--primary-dark);font-weight:600;font-size:14px}
.card-wide{grid-column:span 2;display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start}
.mag-a,.mag-b{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;margin-bottom:48px}
.mag-b{grid-template-columns:.9fr 1.1fr}
.mag-c{background:var(--primary-soft);border-radius:var(--radius);padding:32px;display:grid;grid-template-columns:1fr 1.1fr;gap:32px;align-items:center}
.mag-media img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--radius);box-shadow:var(--shadow-card);border:1px solid var(--line-card)}
.point-list{margin:14px 0 20px}
.point-list li{padding:8px 0 8px 16px;border-left:2px solid var(--primary);color:var(--muted);margin:8px 0}
.cases{background:var(--dark);color:#E8EEF4;padding:96px 0;position:relative;overflow:hidden}
.cases::before{content:"";position:absolute;inset:0;opacity:.16;pointer-events:none;background-image:repeating-linear-gradient(180deg,transparent,transparent 27px,rgba(255,255,255,.12) 28px)}
.cases-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;position:relative;z-index:1}
.cases h2{color:#fff;margin-bottom:14px}
.cases p{color:rgba(232,238,244,.82)}
.case-slice{background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:22px;margin-bottom:16px}
.case-slice h3{color:#fff;margin:8px 0}
.metric-chip{color:#9ad4dc;font-variant-numeric:tabular-nums;font-size:14px;font-weight:700}
.trust-row{display:flex;flex-wrap:wrap;gap:10px}
.trust-row .badge{padding:8px 12px}
.story-grid{display:grid;grid-template-columns:1.4fr .8fr;gap:24px}
.story-side{display:grid;gap:24px}
.story-big{padding:0;overflow:hidden}
.story-big img{width:100%;aspect-ratio:16/9;object-fit:cover}
.story-big .pad,.news-card .pad{padding:22px}
.quote{color:var(--text)}
.compare-wrap{overflow:auto;border:1px solid var(--line-card);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow-card)}
.compare{width:100%;min-width:640px;border-collapse:collapse}
.compare th,.compare td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;font-size:15px}
.compare thead th{background:var(--primary-soft);font-weight:700}
.compare tbody tr:last-child td{border-bottom:0}
.compare .old{color:var(--muted);background:#F7FAFC}
.compare .now{background:#F3F9FF}
.ok{color:var(--accent);font-weight:700}
.no{color:#8A97A6}
.stats{background:var(--primary-soft);border-top:2px solid var(--primary)}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-num{font-size:36px;font-weight:700;font-variant-numeric:tabular-nums;color:var(--primary-dark);line-height:1.2}
.stat-label{margin-top:6px;font-weight:600}
.stat-note{font-size:13px;color:var(--muted);margin-top:6px}
.review-track{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review{background:#fff;border:1px solid var(--line-card);box-shadow:var(--shadow-card);border-radius:var(--radius);padding:24px;border-left:3px solid var(--primary)}
.review-meta{margin-top:16px;color:var(--muted);font-size:13px}
.news-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.news-card{padding:0;overflow:hidden}
.news-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.news-card h3{font-size:18px;margin:8px 0}
.tag{font-size:12px}
.faq-list{display:grid;gap:12px}
.faq-item{background:#fff;border:1px solid var(--line-card);border-radius:var(--radius);box-shadow:var(--shadow-card);overflow:hidden}
.faq-q{width:100%;text-align:left;background:#fff;border:0;padding:18px 20px;font-size:16px;font-weight:600;display:flex;justify-content:space-between;gap:12px;align-items:center;min-height:56px;color:var(--text)}
.faq-q .plus{color:var(--primary);font-size:22px;line-height:1}
.faq-a{display:none;padding:0 20px 18px;color:var(--muted)}
.faq-item.is-open .faq-a{display:block}
.guarantee{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.g-item{background:#fff;border:1px solid var(--line-card);border-left:4px solid var(--primary);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-card)}
.g-item h3{margin-bottom:8px}
.g-item p{color:var(--muted);font-size:15px}
.cta-box{background:#fff;border:1px solid var(--line-card);border-radius:var(--radius);box-shadow:var(--shadow-card);display:grid;grid-template-columns:.9fr 1.1fr;overflow:hidden}
.cta-copy{padding:40px;background:var(--primary-soft)}
.cta-copy h2{margin:10px 0 14px}
.check-list{margin:16px 0 20px}
.check-list li{padding:6px 0;color:var(--muted)}
.cta-form{padding:36px 32px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field{display:flex;flex-direction:column;gap:6px}
.field.full{grid-column:1/-1}
.field label{font-size:14px;font-weight:600}
.field input,.field select,.field textarea{min-height:44px;border:1px solid var(--input-line);border-radius:8px;padding:10px 12px;background:#fff;color:var(--text);font-size:15px}
.field textarea{min-height:96px;resize:vertical}
.field .error{color:#B42318;font-size:13px;display:none}
.field.has-error input,.field.has-error select,.field.has-error textarea{border-color:#B42318}
.field.has-error .error{display:block}
.form-success{display:none;background:rgba(47,143,157,.1);border:1px solid var(--accent);color:var(--text);padding:14px 16px;border-radius:8px;margin-bottom:14px}
.form-success.is-show{display:block}
.contact-mini{margin-top:14px;font-size:14px;color:var(--muted)}
.site-footer{background:var(--footer);color:#C9D4DF;padding:56px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.3fr .9fr 1.2fr .9fr;gap:32px}
.footer-brand .logo{color:#fff;margin-bottom:12px}
.footer-brand .logo-sub{color:#A9B7C5}
.footer-grid h3{color:#fff;font-size:16px;margin-bottom:12px}
.footer-grid a{color:#C9D4DF}
.footer-grid a:hover{color:#fff}
.footer-grid p,.footer-grid li{font-size:14px;line-height:1.8}
.footer-bottom{margin-top:32px;padding-top:18px;border-top:1px solid rgba(255,255,255,.1);font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.footer-bottom a{color:#C9D4DF}
.sticky-bar{position:fixed;left:0;right:0;bottom:0;z-index:900;background:#fff;border-top:1px solid var(--line);box-shadow:0 -8px 24px rgba(27,58,92,.08);padding:10px 0 calc(10px + env(safe-area-inset-bottom));transition:transform .25s ease}
.sticky-bar .container{display:flex;align-items:center;justify-content:space-between;gap:12px}
.sticky-text{font-weight:700}
.sticky-actions{display:flex;gap:10px;align-items:center}
body.has-sticky{padding-bottom:76px}
.sticky-bar.is-hidden{transform:translateY(110%)}
@media (max-width:1200px){
  h1,.hero h1,.hero-title{font-size:36px}
  .hero-panel{width:min(520px,54%)}
}
@media (max-width:992px){
  .section,.cases{padding:72px 0}
  .nav-links,.nav-cta,.nav-top-mid{display:none}
  .menu-toggle{display:flex}
  .nav-top .container{grid-template-columns:1fr auto}
  .hero-viewport{height:auto;min-height:0}
  .hero-slide{position:relative;display:none;opacity:1;visibility:visible}
  .hero-slide.is-active{display:block}
  .hero-panel{position:relative;width:100%;background:rgba(29,90,145,.94)}
  .hero-panel-inner{padding:36px 24px 88px}
  .hero-nav{left:24px;right:auto}
  .split,.mag-a,.mag-b,.mag-c,.cases-grid,.story-grid,.cta-box{grid-template-columns:1fr}
  .mag-b .mag-media{order:-1}
  .adv-grid{grid-template-columns:1fr 1fr}
  .card-wide{grid-column:span 2}
  .timeline{grid-template-columns:repeat(3,1fr)}
  .timeline::before{display:none}
  .stats-grid,.news-grid,.guarantee,.footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:768px){
  :root{--header-main:64px}
  .section,.cases{padding:64px 0}
  h1,.hero h1,.hero-title{font-size:30px}
  h2{font-size:24px}
  .container{width:min(100% - 28px,var(--container))}
  .band-inner{grid-template-columns:1fr}
  .band-item{border-right:0;border-bottom:1px solid var(--line)}
  .timeline,.adv-grid,.review-track,.news-grid{grid-template-columns:1fr}
  .card-wide{grid-column:auto;grid-template-columns:1fr}
  .form-grid,.hero-metrics{grid-template-columns:1fr}
  .sticky-bar .container{flex-direction:column;align-items:stretch}
  .sticky-actions{display:grid;grid-template-columns:1fr 1fr}
  .sticky-text{text-align:center}
  .nav-top-left span:nth-child(2){display:none}
}
@media (max-width:375px){
  h1,.hero h1,.hero-title{font-size:28px}
  .hero-panel-inner{padding:28px 16px 80px}
  .guarantee,.stats-grid,.footer-grid{grid-template-columns:1fr}
  .aisle-grid{grid-template-columns:repeat(8,1fr)}
}