/* roulang page: index */
:root{
  --primary:#1a5fd0;
  --primary-dark:#1e40af;
  --primary-light:#3b82f6;
  --primary-bg:#eff6ff;
  --accent:#0ea5e9;
  --accent-bg:#e0f2fe;
  --bg:#f8fafc;
  --surface:#ffffff;
  --text:#1e293b;
  --text-weak:#64748b;
  --border:#e2e8f0;
  --radius:16px;
  --radius-sm:10px;
  --radius-lg:24px;
  --shadow:0 4px 24px rgba(30,64,175,.06);
  --shadow-lg:0 12px 40px rgba(30,64,175,.10);
  --transition:.3s ease;
  --spacing:96px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{font-family:inherit}
input{font-family:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:var(--spacing) 0;position:relative}
.section-head{margin-bottom:48px;max-width:680px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-tag{display:inline-block;background:var(--primary-bg);color:var(--primary);font-size:13px;font-weight:600;padding:6px 18px;border-radius:20px;margin-bottom:16px;letter-spacing:.5px}
.section-head h2{font-size:32px;font-weight:700;line-height:1.3;color:var(--text);margin-bottom:14px}
.section-head p{font-size:16px;color:var(--text-weak);line-height:1.7}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 30px;border-radius:14px;font-size:15px;font-weight:600;text-decoration:none;border:2px solid transparent;transition:all var(--transition);cursor:pointer;line-height:1.3;gap:8px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-dark);transform:translateY(-2px);box-shadow:0 10px 30px rgba(37,99,235,.28)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{background:transparent;border-color:rgba(255,255,255,.5);color:#fff}
.btn-outline:hover{background:rgba(255,255,255,.14);border-color:#fff;transform:translateY(-2px)}
.btn-light{background:#fff;color:var(--primary)}
.btn-light:hover{background:var(--primary-bg);transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.12)}
.btn:focus-visible{outline:3px solid var(--primary-light);outline-offset:2px}
.tag-link{display:inline-flex;align-items:center;gap:4px;padding:8px 18px;border-radius:20px;background:rgba(255,255,255,.14);color:#fff;font-size:14px;font-weight:500;transition:all var(--transition);border:1px solid rgba(255,255,255,.22)}
.tag-link:hover{background:rgba(255,255,255,.26);transform:translateY(-2px)}

/* Header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(226,232,240,.7);height:72px;transition:box-shadow var(--transition)}
.site-header.scrolled{box-shadow:0 6px 30px rgba(30,64,175,.08)}
.header-inner{max-width:1318px;height:72px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--text);white-space:nowrap}
.logo-icon{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--accent));color:#fff;font-size:19px;flex-shrink:0;box-shadow:0 4px 14px rgba(37,99,235,.25)}
.logo-text{letter-spacing:.3px}
.main-nav{display:flex;gap:6px;align-items:center}
.nav-link{display:inline-flex;align-items:center;padding:8px 18px;border-radius:22px;font-size:14px;font-weight:500;color:var(--text-weak);transition:all var(--transition);text-decoration:none}
.nav-link:hover{color:var(--primary);background:var(--primary-bg)}
.nav-link.active{color:var(--primary);background:var(--primary-bg);font-weight:600}
.nav-cta{padding:8px 22px;border-radius:22px;font-size:14px}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:10px;border-radius:8px;transition:background var(--transition)}
.nav-toggle:hover{background:var(--bg)}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text);margin:4px 0;border-radius:2px;transition:all .3s}
.nav-toggle.open span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle:focus-visible{outline:3px solid var(--primary-light);outline-offset:2px}

/* Hero */
.hero{position:relative;background:linear-gradient(135deg,rgba(30,58,138,.92),rgba(37,99,235,.78)),url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;padding:164px 0 88px;color:#fff;overflow:hidden}
.hero::after{content:'';position:absolute;bottom:0;left:0;right:0;height:120px;background:linear-gradient(to top,var(--bg),transparent)}
.hero-inner{position:relative;text-align:center;z-index:2}
.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 22px;border-radius:24px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.22);font-size:14px;font-weight:500;margin-bottom:24px;backdrop-filter:blur(4px)}
.hero-badge::before{content:'';width:6px;height:6px;border-radius:50%;background:#38bdf8;box-shadow:0 0 0 4px rgba(56,189,248,.3)}
.hero h1{font-size:42px;font-weight:700;line-height:1.25;margin-bottom:20px;letter-spacing:1px;text-shadow:0 2px 16px rgba(0,0,0,.18)}
.hero-desc{max-width:680px;margin:0 auto 36px;font-size:17px;line-height:1.8;color:rgba(255,255,255,.92)}
.hero-search{display:flex;align-items:center;max-width:620px;margin:0 auto 28px;background:#fff;border-radius:50px;padding:6px 6px 6px 20px;box-shadow:0 10px 40px rgba(0,0,0,.15);transition:box-shadow var(--transition);border:2px solid transparent}
.hero-search:focus-within{box-shadow:0 14px 48px rgba(0,0,0,.2);border-color:var(--accent)}
.hero-search svg{flex-shrink:0;opacity:.6}
.hero-search input{flex:1;border:none;outline:none;font-size:15px;padding:12px 14px;background:transparent;color:var(--text)}
.hero-search input::placeholder{color:#94a3b8}
.hero-search button{background:var(--primary);color:#fff;border:none;border-radius:40px;padding:12px 30px;font-size:15px;font-weight:600;cursor:pointer;transition:all var(--transition);white-space:nowrap}
.hero-search button:hover{background:var(--primary-dark)}
.hero-tags{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;margin-bottom:44px}
.hero-tags-label{font-size:14px;color:rgba(255,255,255,.75);margin-right:4px}
.hero-stats{display:flex;justify-content:center;gap:48px;flex-wrap:wrap}
.stat-item{text-align:center;padding:0 8px}
.stat-item strong{display:block;font-size:30px;font-weight:700;margin-bottom:2px;text-shadow:0 2px 10px rgba(0,0,0,.2)}
.stat-item span{font-size:13px;color:rgba(255,255,255,.78);letter-spacing:.5px}

/* Entrance */
.entrance-section{background:var(--surface)}
.entrance-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.entrance-card{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;transition:all var(--transition);position:relative;overflow:hidden}
.entrance-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--accent));opacity:0;transition:opacity var(--transition)}
.entrance-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);background:var(--surface);border-color:rgba(59,130,246,.25)}
.entrance-card:hover::before{opacity:1}
.entrance-card:focus-visible{outline:3px solid var(--primary-light);outline-offset:2px}
.entrance-icon{width:52px;height:52px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:24px;background:linear-gradient(135deg,var(--primary-bg),var(--accent-bg));margin-bottom:20px}
.entrance-card h3{font-size:19px;font-weight:600;margin-bottom:10px}
.entrance-card p{font-size:14px;color:var(--text-weak);line-height:1.65;margin-bottom:16px}
.entrance-more{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:var(--primary)}
.entrance-more i{font-style:normal;transition:transform var(--transition)}
.entrance-card:hover .entrance-more i{transform:translateX(4px)}

/* Features */
.features-section{background:var(--bg)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.feature-card{background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;transition:all var(--transition)}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.feature-card-img{height:200px;overflow:hidden;position:relative}
.feature-card-img::after{content:'';position:absolute;bottom:0;left:0;right:0;height:60px;background:linear-gradient(to top,var(--surface),transparent)}
.feature-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.feature-card:hover .feature-card-img img{transform:scale(1.06)}
.feature-card-body{padding:26px 28px 30px}
.feature-card-body h3{font-size:20px;font-weight:600;margin-bottom:10px}
.feature-card-body p{font-size:14px;color:var(--text-weak);line-height:1.7}

/* Milestone */
.milestone-section{background:linear-gradient(135deg,rgba(15,23,42,.94),rgba(30,64,175,.88)),url('/assets/images/backpic/back-2.jpg') center/cover no-repeat fixed;color:#fff}
.milestone-section .section-tag{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.18)}
.milestone-section .section-head h2{color:#fff}
.milestone-section .section-head p{color:rgba(255,255,255,.75)}
.timeline{position:relative;max-width:760px;margin:0 auto;padding-left:48px}
.timeline::before{content:'';position:absolute;left:14px;top:4px;bottom:4px;width:2px;background:linear-gradient(to bottom,rgba(59,130,246,.7),rgba(56,189,248,.3))}
.timeline-item{position:relative;padding-bottom:48px}
.timeline-item:last-child{padding-bottom:0}
.timeline-dot{position:absolute;left:-44px;top:8px;width:14px;height:14px;border-radius:50%;background:var(--accent);border:3px solid #fff;box-shadow:0 0 0 4px rgba(56,189,248,.35)}
.timeline-date{font-size:13px;font-weight:600;color:rgba(255,255,255,.6);letter-spacing:1px;margin-bottom:6px}
.timeline-content{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius);padding:24px 28px;backdrop-filter:blur(6px);transition:all var(--transition)}
.timeline-content:hover{background:rgba(255,255,255,.14);transform:translateX(4px)}
.timeline-content h3{font-size:18px;font-weight:600;margin-bottom:6px;color:#fff}
.timeline-content p{font-size:14px;color:rgba(255,255,255,.72);line-height:1.7;margin-bottom:0}

/* News */
.news-section{background:var(--surface)}
.news-layout{display:grid;grid-template-columns:1fr 360px;gap:48px;align-items:start}
.news-list{display:flex;flex-direction:column}
.news-item{display:flex;gap:20px;padding:24px 0;border-bottom:1px solid var(--border);transition:all var(--transition)}
.news-item:first-child{padding-top:0}
.news-item:hover{transform:translateX(6px)}
.news-item-date{flex-shrink:0;background:var(--primary-bg);color:var(--primary);font-size:12px;font-weight:600;padding:6px 14px;border-radius:20px;height:fit-content;margin-top:2px}
.news-item-content h3{font-size:17px;font-weight:600;margin-bottom:6px;line-height:1.4;transition:color var(--transition)}
.news-item:hover .news-item-content h3{color:var(--primary)}
.news-item-content p{font-size:14px;color:var(--text-weak);line-height:1.6;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-sidebar{padding:28px;background:var(--bg);border-radius:var(--radius);border:1px solid var(--border)}
.news-sidebar h3{font-size:18px;font-weight:600;margin-bottom:20px;padding-bottom:14px;border-bottom:2px solid var(--primary);display:inline-block}
.sidebar-card{background:var(--surface);border-radius:var(--radius-sm);overflow:hidden;margin-bottom:24px;box-shadow:var(--shadow)}
.sidebar-card img{width:100%;height:140px;object-fit:cover}
.sidebar-card-content{padding:16px 18px}
.sidebar-card-content h4{font-size:15px;font-weight:600;margin-bottom:6px;line-height:1.4}
.sidebar-card-content p{font-size:13px;color:var(--text-weak);line-height:1.5}
.sidebar-list{display:flex;flex-direction:column;gap:12px}
.sidebar-list li{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--text);font-weight:500;padding:10px 14px;background:var(--surface);border-radius:var(--radius-sm);transition:all var(--transition);cursor:pointer}
.sidebar-list li::before{content:'·';font-size:24px;color:var(--primary);font-weight:700;line-height:1}
.sidebar-list li:hover{background:var(--primary-bg);color:var(--primary);transform:translateX(4px)}

/* Trust */
.trust-section{background:var(--bg)}
.trust-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.trust-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:36px 30px;text-align:center;transition:all var(--transition)}
.trust-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}
.trust-icon{width:64px;height:64px;margin:0 auto 20px;border-radius:20px;display:flex;align-items:center;justify-content:center;font-size:28px;background:var(--primary-bg)}
.trust-card h3{font-size:18px;font-weight:600;margin-bottom:10px}
.trust-card p{font-size:14px;color:var(--text-weak);line-height:1.7}
.trust-card:nth-child(2) .trust-icon{background:var(--accent-bg)}
.trust-card:nth-child(3) .trust-icon{background:#fef3c7}

/* FAQ */
.faq-section{background:var(--surface)}
.faq-list{max-width:760px;margin:0 auto}
.faq-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);margin-bottom:14px;overflow:hidden;transition:all var(--transition)}
.faq-item:hover{border-color:rgba(59,130,246,.3)}
.faq-item[open]{background:var(--surface);box-shadow:var(--shadow)}
.faq-item summary{display:flex;align-items:center;justify-content:space-between;padding:22px 26px;font-size:16px;font-weight:600;cursor:pointer;list-style:none;gap:16px;transition:color var(--transition)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:26px;color:var(--primary);font-weight:400;transition:transform var(--transition);flex-shrink:0;line-height:1}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item[open] summary{color:var(--primary)}
.faq-item p{padding:0 26px 24px;font-size:15px;color:var(--text-weak);line-height:1.8}

/* App */
.app-section{background:linear-gradient(135deg,rgba(30,64,175,.96),rgba(14,165,233,.9)),url('/assets/images/backpic/back-3.jpg') center/cover no-repeat;color:#fff}
.app-inner{display:flex;align-items:center;gap:56px;position:relative;z-index:2}
.app-content{flex:1}
.app-content .section-tag{background:rgba(255,255,255,.16);color:#fff;border:1px solid rgba(255,255,255,.2)}
.app-content h2{font-size:32px;font-weight:700;line-height:1.3;margin-bottom:18px}
.app-content p{font-size:16px;color:rgba(255,255,255,.82);line-height:1.8;margin-bottom:32px}
.app-buttons{display:flex;gap:16px;flex-wrap:wrap}
.app-qr-card{flex-shrink:0;background:rgba(255,255,255,.96);border-radius:var(--radius);padding:28px;text-align:center;box-shadow:0 16px 50px rgba(0,0,0,.2)}
.app-qr-placeholder{width:160px;height:160px;margin:0 auto 16px;background:repeating-conic-gradient(#f1f5f9 0% 25%,#fff 0% 50%) 0px 0px/20px 20px;border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--text-weak);font-size:14px;border:2px dashed var(--border)}
.app-qr-card p{font-size:14px;color:var(--text);font-weight:600;margin-bottom:4px}
.app-qr-card span{font-size:12px;color:var(--text-weak)}

/* CTA */
.cta-section{background:var(--bg);text-align:center}
.cta-inner{background:linear-gradient(135deg,var(--primary),var(--accent));border-radius:var(--radius-lg);padding:68px 48px;color:#fff;position:relative;overflow:hidden}
.cta-inner::before{content:'';position:absolute;top:-40px;right:-40px;width:160px;height:160px;border-radius:50%;background:rgba(255,255,255,.08)}
.cta-inner::after{content:'';position:absolute;bottom:-60px;left:-20px;width:200px;height:200px;border-radius:50%;background:rgba(255,255,255,.05)}
.cta-inner h2{font-size:30px;font-weight:700;margin-bottom:14px;position:relative;z-index:2}
.cta-inner p{font-size:16px;color:rgba(255,255,255,.85);max-width:560px;margin:0 auto 32px;position:relative;z-index:2}
.cta-buttons{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;position:relative;z-index:2}

/* Footer */
.site-footer{background:#0f172a;color:#94a3b8;padding:72px 0 0;font-size:14px}
.footer-top{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:48px;padding-bottom:48px;border-bottom:1px solid rgba(255,255,255,.08)}
.footer-brand .footer-logo{font-size:22px;font-weight:700;color:#fff;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.footer-brand p{line-height:1.7;color:#94a3b8;max-width:360px}
.footer-links h4{color:#fff;font-size:16px;font-weight:600;margin-bottom:18px}
.footer-links a{display:block;color:#94a3b8;margin-bottom:10px;transition:color var(--transition)}
.footer-links a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;padding:24px 0;flex-wrap:wrap;gap:12px;font-size:13px}
.footer-bottom p{color:#64748b}

/* Mobile nav */
@media (max-width:1024px){
  .features-grid,.entrance-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:34px}
  .app-inner{flex-direction:column;text-align:center}
  .app-qr-card{margin:0 auto}
  .app-content .section-tag{margin:0 auto 16px}
}

@media (max-width:768px){
  :root{--spacing:72px}
  .section-head h2{font-size:26px}
  .main-nav{display:none}
  .nav-toggle{display:block}
  .nav-cta{display:none}
  .main-nav.open{display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;background:#fff;padding:16px 24px;gap:4px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg);align-items:flex-start}
  .main-nav.open .nav-link{width:100%;padding:12px 16px;border-radius:12px}
  .hero{padding:130px 0 64px}
  .hero h1{font-size:27px}
  .hero-desc{font-size:15px}
  .hero-search{flex-direction:column;background:transparent;box-shadow:none;gap:10px}
  .hero-search input{width:100%;background:#fff;border-radius:40px;padding:14px 20px}
  .hero-search button{width:100%}
  .hero-stats{gap:24px}
  .stat-item strong{font-size:24px}
  .news-layout{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr;gap:32px}
  .cta-inner{padding:48px 24px}
  .cta-inner h2{font-size:24px}
  .timeline{padding-left:36px}
}

@media (max-width:520px){
  .entrance-grid,.features-grid,.trust-grid{grid-template-columns:1fr}
  .hero-tags{gap:8px}
  .hero-search button{padding:12px 20px;font-size:14px}
  .footer-bottom{flex-direction:column;text-align:center}
  .app-buttons{justify-content:center}
}