```css
*,::after,::before{box-sizing:border-box;margin:0;padding:0}
body{font-family:system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',sans-serif;background:#f5f7fc;color:#1e293b;line-height:1.6;transition:background .3s,color .3s}
body.dark{background:#0f172a;color:#e2e8f0}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
/* header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid rgba(0,0,0,.05);transition:background .3s,box-shadow .3s}
.dark .site-header{background:rgba(15,23,42,.85);border-color:rgba(255,255,255,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo svg{height:40px;width:auto;display:block}
.nav{display:flex;gap:28px;font-weight:500}
.nav a{position:relative;padding:4px 0;transition:color .2s}
.nav a:hover{color:#2563eb}
.dark .nav a:hover{color:#60a5fa}
.nav a.active::after{content:'';position:absolute;bottom:-2px;left:0;width:100%;height:2px;background:#2563eb;border-radius:2px}
.hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.hamburger span{width:26px;height:2px;background:#1e293b;border-radius:4px;transition:.3s}
.dark .hamburger span{background:#e2e8f0}
.dark-toggle{background:rgba(0,0,0,.08);border:none;border-radius:30px;padding:6px 12px;font-size:14px;cursor:pointer;display:flex;align-items:center;gap:6px;transition:.2s}
.dark .dark-toggle{background:rgba(255,255,255,.12)}
.mobile-menu{display:none;position:absolute;top:68px;left:0;width:100%;background:rgba(255,255,255,.98);backdrop-filter:blur(16px);padding:20px;box-shadow:0 20px 40px rgba(0,0,0,.1)}
.dark .mobile-menu{background:rgba(15,23,42,.98)}
.mobile-menu a{display:block;padding:12px 0;border-bottom:1px solid rgba(0,0,0,.05);font-weight:500}
@media (max-width:960px){.nav{display:none}.hamburger{display:flex}.mobile-menu.open{display:block}}
/* hero banner */
.hero{background:linear-gradient(135deg,#0b1a2e 0%,#1a3b5c 60%,#2b5a7a 100%);color:#fff;padding:80px 0;overflow:hidden;position:relative;border-radius:0 0 48px 48px;margin-bottom:32px}
.dark .hero{background:linear-gradient(135deg,#07111e 0%,#0f2940 60%,#1a3f5c 100%)}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.hero h1{font-size:3.2rem;font-weight:700;line-height:1.2;margin-bottom:20px;letter-spacing:-.02em}
.hero p{font-size:1.2rem;opacity:.9;margin-bottom:32px;max-width:520px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;background:#f0c040;color:#0b1a2e;padding:14px 32px;border-radius:60px;font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:all .2s;box-shadow:0 8px 20px rgba(240,192,64,.3)}
.btn-outline{background:transparent;border:1px solid rgba(255,255,255,.4);color:#fff;box-shadow:none}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(240,192,64,.4)}
.hero-badge{display:inline-block;background:rgba(255,255,255,.12);padding:6px 16px;border-radius:40px;font-size:.85rem;margin-bottom:20px;backdrop-filter:blur(4px)}
.hero-visual{display:flex;justify-content:center;align-items:center;position:relative}
.hero-svg{width:100%;max-width:480px;height:auto;filter:drop-shadow(0 20px 40px rgba(0,0,0,.3))}
@media (max-width:800px){.hero-grid{grid-template-columns:1fr;text-align:center}.hero h1{font-size:2.4rem}.hero p{margin-left:auto;margin-right:auto}}
/* section */
section{padding:64px 0}
.section-title{font-size:2.2rem;font-weight:700;margin-bottom:12px;letter-spacing:-.01em}
.section-sub{font-size:1.1rem;color:#475569;max-width:720px;margin-bottom:40px}
.dark .section-sub{color:#94a3b8}
.card{background:#fff;border-radius:24px;padding:28px;box-shadow:0 4px 20px rgba(0,0,0,.04);transition:all .2s;border:1px solid rgba(0,0,0,.03)}
.dark .card{background:#1e293b;border-color:rgba(255,255,255,.06);box-shadow:0 4px 20px rgba(0,0,0,.3)}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(0,0,0,.08)}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.brand-story{display:flex;flex-wrap:wrap;gap:40px;align-items:center}
.brand-story .text{flex:1 1 380px}
.brand-story .media{flex:1 1 320px}
.stat-number{font-size:3rem;font-weight:800;color:#2563eb;line-height:1.2}
.dark .stat-number{color:#60a5fa}
.timeline{position:relative;padding-left:32px;border-left:3px solid #2563eb}
.timeline-item{margin-bottom:28px;position:relative}
.timeline-item::before{content:'';width:14px;height:14px;background:#2563eb;border-radius:50%;position:absolute;left:-40px;top:6px}
.faq-item{border-bottom:1px solid rgba(0,0,0,.06);padding:18px 0;cursor:pointer}
.dark .faq-item{border-color:rgba(255,255,255,.08)}
.faq-question{display:flex;justify-content:space-between;font-weight:600;font-size:1.1rem}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease;padding-top:8px;color:#475569}
.dark .faq-answer{color:#cbd5e1}
.faq-item.open .faq-answer{max-height:300px}
.footer{background:#0b1a2e;color:#cbd5e1;padding:48px 0 24px;border-radius:48px 48px 0 0;margin-top:48px}
.dark .footer{background:#020617}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px}
.footer a{color:#94a3b8;transition:color .2s}
.footer a:hover{color:#f0c040}
.copyright{border-top:1px solid rgba(255,255,255,.08);padding-top:24px;margin-top:32px;text-align:center;font-size:.9rem}
/* breadcrumb */
.breadcrumb{display:flex;gap:8px;font-size:.9rem;color:#64748b;padding:12px 0 0;flex-wrap:wrap}
.breadcrumb a{color:#2563eb}
.dark .breadcrumb{color:#94a3b8}
/* animation fade */
.fade-up{opacity:0;transform:translateY(30px);transition:opacity .6s ease,transform .6s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}
/* partner/client */
.testimonial{padding:24px;background:#f8fafc;border-radius:20px;border:1px solid #e2e8f0}
.dark .testimonial{background:#1e293b;border-color:#334155}
/* howto */
.howto-step{display:flex;gap:18px;margin-bottom:24px;align-items:flex-start}
.step-num{background:#2563eb;color:#fff;width:36px;height:36px;border-radius:40px;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
/* 暗黑模式过渡 */
.theme-transition *{transition:background .2s,color .2s,border-color .2s}
/* 轮播控制 */
.carousel{overflow:hidden;position:relative;border-radius:24px}
.carousel-track{display:flex;transition:transform .5s cubic-bezier(.25,.46,.45,.94)}
.carousel-item{min-width:100%;padding:20px}
.carousel-btn{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.6);backdrop-filter:blur(8px);border:none;width:44px;height:44px;border-radius:44px;font-size:1.5rem;cursor:pointer;z-index:5;transition:.2s;color:#1e293b}
.carousel-btn:hover{background:#fff}
.dark .carousel-btn{background:rgba(0,0,0,.5);color:#fff}
.carousel-btn.prev{left:12px}
.carousel-btn.next{right:12px}
/* 数字动画占位 */
.count-up{display:inline-block}
```