/* roulang page: index */
:root{
  --primary:#1F6AA7;
  --primary-hover:#185888;
  --accent:#2A9B8F;
  --warn:#C47B2D;
  --bg:#F5F8FB;
  --card:#FFFFFF;
  --info:#E8F1F8;
  --dark:#16324A;
  --dark-text:#F4F8FC;
  --title:#123047;
  --text:#334155;
  --muted:#64748B;
  --border:#D7E3EE;
  --shadow:0 10px 30px rgba(18,48,71,.06);
  --shadow-hover:0 16px 40px rgba(31,106,167,.12);
  --radius-card:16px;
  --radius-btn:10px;
  --radius-badge:6px;
  --radius-input:8px;
  --container:1200px;
  --header-h:108px;
  --font:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --space-section:108px;
  --space-section-m:64px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--header-h)}
body{
  font-family:var(--font);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--bg);
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--primary-hover)}
button,input,select,textarea{font-family:inherit;font-size:inherit}
button{cursor:pointer;border:0;background:none}
ul,ol{list-style:none}
h1,h2,h3,h4{color:var(--title);font-weight:700;line-height:1.28;letter-spacing:0}
h1{font-size:46px}
h2{font-size:30px}
h3{font-size:21px}
.num,.stat-num,.count{font-variant-numeric:tabular-nums;font-feature-settings:"tnum"}
.container{width:min(100% - 40px,var(--container));margin:0 auto}
.skip{
  position:absolute;left:-999px;top:0;background:var(--primary);color:#fff;padding:8px 14px;z-index:100
}
.skip:focus{left:12px;top:12px}
.site-header{
  position:sticky;top:0;z-index:80;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid rgba(215,227,238,.7);
}
.nav-top{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:40px;font-size:13px;color:var(--muted);
  border-bottom:1px solid rgba(215,227,238,.55);
}
.nav-top .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.brand-short{font-weight:600;color:var(--title);display:flex;align-items:center;gap:8px}
.brand-short i{width:7px;height:7px;border-radius:50%;background:var(--accent);display:inline-block}
.nav-meta{display:flex;align-items:center;gap:18px}
.nav-meta a{color:var(--text)}
.nav-meta a:hover{color:var(--primary)}
.nav-main{height:68px}
.nav-main .container{display:flex;align-items:center;justify-content:space-between;height:100%;gap:20px}
.logo{
  display:flex;align-items:center;gap:10px;color:var(--title);font-weight:700;font-size:18px;flex-shrink:0
}
.logo:hover{color:var(--title)}
.logo-mark{
  width:34px;height:34px;border-radius:8px;background:var(--primary);display:grid;place-items:center;
  box-shadow:0 6px 14px rgba(31,106,167,.22)
}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  position:relative;color:var(--text);padding:10px 12px;font-size:15px;font-weight:500;border-radius:8px
}
.nav-links a:hover{color:var(--primary);background:var(--info)}
.nav-links a.active{color:var(--primary)}
.nav-links a.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:6px;height:2px;background:var(--primary);border-radius:2px
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 18px;border-radius:var(--radius-btn);font-weight:600;
  transition:transform .2s ease,background .2s ease,box-shadow .2s ease,border-color .2s ease,color .2s ease
}
.btn:hover{transform:translateY(-4px)}
.btn:active{transform:translateY(-1px)}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover);color:#fff}
.btn-ghost{background:#fff;color:var(--primary);border:1px solid var(--primary)}
.btn-ghost:hover{background:var(--info);color:var(--primary-hover);border-color:var(--primary-hover)}
.btn-light{background:#fff;color:var(--title);border:1px solid var(--border)}
.btn-sm{min-height:40px;padding:0 14px;font-size:14px}
.menu-toggle{
  display:none;width:44px;height:44px;border-radius:10px;border:1px solid var(--border);align-items:center;justify-content:center;flex-direction:column;gap:5px
}
.menu-toggle span{width:18px;height:2px;background:var(--title);display:block;transition:.2s}
body.nav-open .menu-toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
body.nav-open .menu-toggle span:nth-child(2){opacity:0}
body.nav-open .menu-toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.drawer-mask{display:none}
.badge{
  display:inline-flex;align-items:center;gap:6px;padding:4px 8px;border-radius:var(--radius-badge);
  background:var(--info);color:var(--primary);font-size:12px;font-weight:600
}
.badge-ok{background:rgba(42,155,143,.12);color:#1a7a71}
.badge-warn{background:rgba(196,123,45,.12);color:var(--warn)}
.section{padding:var(--space-section) 0;position:relative}
.section-alt{background:#fff}
.section-head{margin-bottom:40px;max-width:760px}
.section-head p{margin-top:14px;color:var(--muted)}
.kicker{color:var(--primary);font-weight:600;font-size:13px;margin-bottom:10px;display:inline-flex;align-items:center;gap:8px}
.kicker::before{content:"";width:18px;height:2px;background:var(--accent);display:block}
.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius-card);
  box-shadow:var(--shadow);transition:transform .22s ease,box-shadow .22s ease
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.hero{
  padding:0;background:#e7f0f7;overflow:hidden
}
.hero-slider{position:relative;min-height:640px}
.slide{
  position:absolute;inset:0;opacity:0;visibility:hidden;transition:opacity .55s ease;
  display:grid;grid-template-columns:1.08fr .92fr;align-items:center;gap:40px;
  padding:56px 0 72px
}
.slide.is-active{position:relative;opacity:1;visibility:visible}
.slide-bg{
  position:absolute;inset:0;background-size:cover;background-position:center;
  filter:saturate(.85) contrast(1.02)
}
.slide-bg::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(90deg,rgba(245,248,251,.94) 0%,rgba(245,248,251,.86) 42%,rgba(245,248,251,.42) 100%),
    repeating-linear-gradient(0deg,transparent,transparent 31px,rgba(31,106,167,.05) 32px),
    repeating-linear-gradient(90deg,transparent,transparent 31px,rgba(31,106,167,.05) 32px)
}
.slide .container{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;align-items:center;gap:36px;width:min(100% - 40px,var(--container))}
.hero-copy h1,.hero-copy h2{margin:8px 0 16px;max-width:16em}
.hero-lead{color:var(--text);margin-bottom:22px;max-width:38em}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:22px}
.hero-window{
  display:flex;flex-wrap:wrap;gap:10px;align-items:center;
  background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px 14px;box-shadow:var(--shadow)
}
.hero-window strong{color:var(--title);font-size:14px}
.countdown{display:flex;gap:8px}
.cd-box{
  min-width:52px;background:var(--info);border-radius:8px;text-align:center;padding:6px 4px
}
.cd-box b{display:block;color:var(--primary);font-size:18px;line-height:1.2}
.cd-box span{font-size:11px;color:var(--muted)}
.hero-visual{
  position:relative;border-radius:18px;overflow:hidden;box-shadow:var(--shadow-hover);border:1px solid #fff
}
.hero-visual img{width:100%;height:460px;object-fit:cover}
.hero-chip{
  position:absolute;left:16px;bottom:16px;background:#fff;border-radius:10px;padding:10px 12px;
  box-shadow:var(--shadow);font-size:13px;color:var(--title);display:flex;gap:10px;align-items:center
}
.hero-chip .dot{width:8px;height:8px;border-radius:50%;background:var(--accent)}
.slider-nav{
  position:absolute;z-index:3;inset:auto 20px 24px auto;display:flex;gap:10px
}
.slider-btn{
  width:44px;height:44px;border-radius:10px;background:#fff;border:1px solid var(--border);
  color:var(--title);display:grid;place-items:center;box-shadow:var(--shadow)
}
.slider-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary)}
.slider-dots{position:absolute;z-index:3;left:50%;bottom:24px;transform:translateX(-50%);display:flex;gap:8px}
.slider-dots button{
  width:28px;height:8px;border-radius:8px;background:rgba(18,48,71,.18)
}
.slider-dots button.is-on{background:var(--primary)}
.pain-grid{display:grid;grid-template-columns:.78fr 1.22fr;gap:48px;align-items:start}
.pain-quote{
  background:#fff;border-radius:var(--radius-card);padding:36px;box-shadow:var(--shadow);border:1px solid var(--border)
}
.pain-quote h2{margin-bottom:16px}
.pain-list{display:flex;flex-direction:column;gap:14px}
.pain-item{
  display:grid;grid-template-columns:52px 1fr;gap:16px;align-items:start;
  background:#fff;border:1px solid var(--border);border-radius:14px;padding:18px 20px;box-shadow:var(--shadow)
}
.pain-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.pain-ico{
  width:52px;height:52px;border-radius:12px;background:var(--info);color:var(--primary);
  display:grid;place-items:center
}
.pain-item h3{margin-bottom:6px}
.pain-item p{color:var(--muted);font-size:15px}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.split-copy .checks{margin:20px 0 24px;display:grid;gap:12px}
.check{
  display:grid;grid-template-columns:22px 1fr;gap:10px;align-items:start;color:var(--text)
}
.check i{
  width:22px;height:22px;border-radius:50%;background:rgba(42,155,143,.14);color:var(--accent);
  display:grid;place-items:center;margin-top:4px
}
.spec-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.split-visual{position:relative}
.split-visual img{width:100%;height:460px;object-fit:cover;border-radius:18px;box-shadow:var(--shadow);border:1px solid var(--border)}
.float-note{
  position:absolute;right:-12px;bottom:24px;background:#fff;border-radius:12px;padding:14px 16px;
  box-shadow:var(--shadow-hover);border:1px solid var(--border);max-width:230px
}
.float-note b{display:block;color:var(--title);font-size:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.cap-card{padding:26px}
.cap-ico{
  width:46px;height:46px;border-radius:12px;background:var(--info);display:grid;place-items:center;margin-bottom:16px;color:var(--primary)
}
.cap-card p{color:var(--muted);margin:10px 0 16px;min-height:4.8em}
.cap-card .badge{margin-right:6px}
.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;position:relative}
.timeline::before{
  content:"";position:absolute;left:6%;right:6%;top:28px;height:2px;background:linear-gradient(90deg,var(--info),var(--primary),var(--accent))
}
.step{
  background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px 18px 20px;position:relative;box-shadow:var(--shadow)
}
.step-no{
  width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;display:grid;place-items:center;
  font-weight:700;margin-bottom:14px;position:relative;z-index:1
}
.step h3{font-size:18px;margin-bottom:10px}
.step li{position:relative;padding-left:14px;color:var(--muted);font-size:14px;margin-bottom:6px}
.step li::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent);position:absolute;left:0;top:9px}
.product-grid{display:grid;grid-template-columns:1.05fr .9fr .9fr;gap:22px;align-items:stretch}
.product-card{overflow:hidden;display:flex;flex-direction:column}
.product-card.lift{margin-top:28px}
.product-cover{aspect-ratio:16/10;overflow:hidden}
.product-cover img{width:100%;height:100%;object-fit:cover}
.product-body{padding:22px 22px 24px;display:flex;flex-direction:column;gap:10px;flex:1}
.product-body p{color:var(--muted)}
.product-body ul{display:grid;gap:6px;margin:4px 0 8px}
.product-body li{padding-left:16px;position:relative;color:var(--text);font-size:15px}
.product-body li::before{content:"";width:7px;height:7px;border-radius:2px;background:var(--primary);position:absolute;left:0;top:9px}
.param{display:flex;flex-wrap:wrap;gap:8px;margin:4px 0 8px}
.dark-band{
  background:var(--dark);color:var(--dark-text);padding:96px 0;position:relative;overflow:hidden
}
.dark-band::before{
  content:"";position:absolute;inset:0;
  background:
    repeating-linear-gradient(0deg,transparent,transparent 39px,rgba(244,248,252,.04) 40px),
    repeating-linear-gradient(90deg,transparent,transparent 39px,rgba(244,248,252,.04) 40px)
}
.dark-band .container{position:relative;z-index:1;display:grid;grid-template-columns:.9fr 1.1fr;gap:48px}
.dark-band h2{color:#fff}
.dark-band .lead{color:#c5d4e2;margin-top:14px}
.case-slice{
  background:rgba(255,255,255,.04);border:1px solid rgba(244,248,252,.12);border-radius:16px;padding:22px;margin-bottom:16px
}
.case-slice h3{color:#fff;margin-bottom:8px}
.case-slice p{color:#c9d7e4}
.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.result-card{padding:28px;background:#fff}
.result-card .meta{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0 14px}
.result-card dl{display:grid;gap:8px}
.result-card dt{font-size:13px;color:var(--muted)}
.result-card dd{font-weight:700;color:var(--title);font-size:20px;font-variant-numeric:tabular-nums}
.story-wrap{display:grid;grid-template-columns:1.3fr .7fr;gap:22px}
.story-main{padding:32px;display:grid;grid-template-columns:92px 1fr;gap:20px;align-items:start}
.avatar{
  width:92px;height:92px;border-radius:50%;object-fit:cover;border:3px solid #fff;box-shadow:var(--shadow)
}
.avatar-sm{width:64px;height:64px}
.quote{font-size:20px;color:var(--title);font-weight:600;line-height:1.55;margin-bottom:14px}
.story-side{display:grid;gap:16px}
.story-mini{padding:20px;display:grid;grid-template-columns:64px 1fr;gap:14px}
.review-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.review{padding:22px}
.review p{color:var(--text);margin:10px 0 16px}
.who{font-size:14px;color:var(--muted)}
.who b{display:block;color:var(--title)}
.audience-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.aud{padding:22px}
.fit,.nofit{margin-top:12px;font-size:14px}
.fit b{color:#1a7a71;display:block;margin-bottom:4px}
.nofit b{color:var(--warn);display:block;margin-bottom:4px}
.scene-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.scene{
  display:grid;grid-template-columns:180px 1fr;overflow:hidden
}
.scene img{width:180px;height:100%;object-fit:cover}
.scene-body{padding:22px}
.stats{
  background:linear-gradient(180deg,#E8F1F8 0%,#F5F8FB 100%);padding:72px 0
}
.stats-row{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;text-align:center}
.stat{padding:12px}
.stat-num{font-size:40px;font-weight:700;color:var(--primary);line-height:1.1}
.stat span{display:block;color:var(--muted);margin-top:6px}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.news-card{overflow:hidden}
.news-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.news-body{padding:18px 20px 22px}
.news-body time{color:var(--muted);font-size:13px}
.news-body h3{
  margin:8px 0 10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:2.56em
}
.news-body p{color:var(--muted);font-size:15px}
.faq-list{display:grid;gap:12px;max-width:920px}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
.faq-q{
  width:100%;text-align:left;padding:18px 22px;display:flex;justify-content:space-between;gap:16px;
  color:var(--title);font-weight:650;min-height:56px;align-items:center
}
.faq-q:hover{background:var(--info)}
.faq-q:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.faq-ico{
  width:28px;height:28px;border-radius:8px;border:1px solid var(--border);display:grid;place-items:center;flex-shrink:0;color:var(--primary)
}
.faq-a{display:none;padding:0 22px 18px;background:#f8fbfe;color:var(--text)}
.faq-item.open .faq-a{display:block}
.faq-item.open .faq-ico{background:var(--primary);color:#fff;border-color:var(--primary)}
.cta-band{padding:96px 0 108px}
.cta-box{
  display:grid;grid-template-columns:1.05fr .95fr;gap:40px;background:#fff;border:1px solid var(--border);
  border-radius:20px;padding:40px;box-shadow:var(--shadow)
}
.deliver{display:grid;gap:12px;margin:18px 0 8px}
.deliver li{background:var(--info);border-radius:10px;padding:12px 14px}
.form{display:grid;gap:12px}
.form label{display:grid;gap:6px;font-weight:600;color:var(--title);font-size:14px}
.form input,.form select{
  height:46px;border:1px solid var(--border);border-radius:var(--radius-input);padding:0 12px;background:#fff;color:var(--title)
}
.form input:focus,.form select:focus{outline:2px solid var(--accent);border-color:transparent}
.form .err{border-color:#c24141}
.form .hint{color:#c24141;font-size:12px;font-weight:400;display:none}
.form .hint.show{display:block}
.form-ok{display:none;background:rgba(42,155,143,.12);color:#1a7a71;border-radius:10px;padding:10px 12px}
.site-footer{background:#e9f0f6;border-top:1px solid var(--border);padding:56px 0 24px;color:var(--muted)}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1.1fr;gap:28px;margin-bottom:32px}
.foot-brand .logo{margin-bottom:12px}
.foot-grid h3{font-size:16px;margin-bottom:12px}
.foot-grid a{display:block;color:var(--text);padding:4px 0}
.foot-grid a:hover{color:var(--primary)}
.icp{color:var(--muted)}
.copyright{border-top:1px solid var(--border);padding-top:16px;font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
@media (max-width:1280px){
  h1{font-size:40px}
  .hero-visual img{height:400px}
  .product-grid{grid-template-columns:repeat(3,1fr)}
  .product-card.lift{margin-top:0}
}
@media (max-width:1024px){
  :root{--header-h:104px;--space-section:84px}
  h1{font-size:36px}
  h2{font-size:26px}
  .nav-links{display:none}
  .menu-toggle{display:flex}
  .drawer-mask{
    display:block;position:fixed;inset:0;background:rgba(18,48,71,.28);opacity:0;pointer-events:none;transition:.2s;z-index:90
  }
  .nav-drawer{
    position:fixed;top:0;right:0;height:100%;width:min(86vw,360px);background:#fff;z-index:100;
    transform:translateX(100%);transition:transform .28s ease;padding:24px 20px 32px;overflow:auto
  }
  body.nav-open{overflow:hidden}
  body.nav-open .drawer-mask{opacity:1;pointer-events:auto}
  body.nav-open .nav-drawer{transform:none}
  .nav-drawer a{
    display:flex;align-items:center;min-height:48px;padding:10px 8px;border-bottom:1px solid var(--border);color:var(--title);font-weight:600
  }
  .slide .container,.pain-grid,.split,.dark-band .container,.story-wrap,.cta-box,.foot-grid{
    grid-template-columns:1fr
  }
  .hero-visual img,.split-visual img{height:320px}
  .float-note{right:12px}
  .grid-3,.result-grid,.news-grid,.product-grid{grid-template-columns:1fr 1fr}
  .review-grid,.audience-grid,.stats-row,.timeline{grid-template-columns:1fr 1fr}
  .timeline::before{display:none}
  .scene{grid-template-columns:140px 1fr}
  .scene img{width:140px}
  .nav-meta .hide-md{display:none}
}
@media (max-width:768px){
  :root{--space-section:64px}
  .container{width:min(100% - 28px,var(--container))}
  h1{font-size:30px}
  h2{font-size:24px}
  .nav-top .brand-short,.nav-meta span.hide-sm{display:none}
  .hero-slider{min-height:auto}
  .slide{padding:28px 0 88px}
  .hero-window{flex-direction:column;align-items:flex-start}
  .grid-3,.result-grid,.news-grid,.product-grid,.review-grid,.audience-grid,.stats-row,.timeline,.scene-grid{
    grid-template-columns:1fr
  }
  .scene{grid-template-columns:1fr}
  .scene img{width:100%;height:180px}
  .story-main{grid-template-columns:1fr}
  .cta-box{padding:24px}
  .slider-nav{right:12px;bottom:18px}
  .form .btn{width:100%}
  .copyright{flex-direction:column}
  .stat-num{font-size:32px}
}
@media (max-width:375px){
  h1{font-size:28px}
  .btn{width:100%}
  .hero-actions{width:100%}
  .nav-meta a.btn{width:auto;padding:0 10px;font-size:13px}
  .cd-box{min-width:46px}
}