```css
/* 全局样式与品牌系统 — 现代企业官网风格, 暗色支持, 玻璃效果, 渐变, 圆角, 阴影, 滚动动画, 数字动画, 轮播 */
:root{--brand:#1a2a4a;--brand-light:#2c4370;--accent:#f0b35b;--accent2:#e89f3e;--bg:#f7f9fc;--bg-card:#ffffff;--text:#1e293b;--text-light:#4b5a72;--glass:rgba(255,255,255,0.25);--shadow:0 20px 40px -12px rgba(0,0,0,0.1);--radius:24px;--radius-sm:12px;--transition:0.3s cubic-bezier(0.2,0,0,1);--font:'Inter',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif}.dark{--bg:#0b0f1c;--bg-card:#141b2b;--text:#eef2f8;--text-light:#a0b3cc;--glass:rgba(20,30,50,0.5);--shadow:0 20px 40px -12px rgba(0,0,0,0.6)}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--text);line-height:1.6;transition:background var(--transition),color var(--transition)}a{color:var(--accent);text-decoration:none;transition:color 0.2s}a:hover{color:var(--accent2)}img,svg{display:block;max-width:100%;height:auto}.container{max-width:1280px;margin:0 auto;padding:0 24px}.section{padding:100px 0 80px}.section-title{font-size:clamp(2rem,5vw,3rem);font-weight:700;letter-spacing:-0.02em;margin-bottom:16px;background:linear-gradient(135deg,var(--brand),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.section-sub{font-size:1.15rem;color:var(--text-light);max-width:700px;margin-bottom:48px}.glass-card{background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,0.08);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px 28px;transition:transform 0.3s,box-shadow 0.3s}.glass-card:hover{transform:translateY(-6px);box-shadow:0 28px 48px -16px rgba(0,0,0,0.25)}.btn{display:inline-flex;align-items:center;gap:8px;background:linear-gradient(135deg,var(--accent),#d68f2c);color:#0b0f1c;font-weight:600;padding:14px 34px;border-radius:60px;border:none;font-size:1rem;cursor:pointer;transition:transform 0.2s,box-shadow 0.2s;box-shadow:0 8px 18px rgba(240,179,91,0.3)}.btn:hover{transform:scale(1.02);box-shadow:0 12px 24px rgba(240,179,91,0.4)}.btn-outline{background:transparent;border:2px solid var(--accent);color:var(--accent);box-shadow:none}.btn-outline:hover{background:var(--accent);color:#0b0f1c}.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}.flex-center{display:flex;align-items:center;justify-content:center}.text-center{text-align:center}.mt-24{margin-top:24px}.mb-16{margin-bottom:16px}.hidden{display:none}@media(max-width:768px){.section{padding:64px 0 48px}.container{padding:0 16px}}
/* Header 吸顶 + 玻璃 */
header{position:sticky;top:0;z-index:100;background:var(--glass);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid rgba(255,255,255,0.05);padding:0 24px;height:72px;display:flex;align-items:center;justify-content:space-between;transition:background 0.3s}.header-logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:1.5rem;color:var(--text)}.header-logo svg{width:40px;height:40px}.nav{display:flex;gap:24px;list-style:none}.nav a{color:var(--text);font-weight:500;padding:6px 0;border-bottom:2px solid transparent;transition:0.2s}.nav a:hover,.nav a.active{border-bottom-color:var(--accent);color:var(--accent)}.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.8rem;cursor:pointer}.dark-toggle{background:var(--glass);border:1px solid rgba(255,255,255,0.1);border-radius:40px;width:44px;height:44px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.4rem;color:var(--text);transition:0.2s}@media(max-width:768px){.nav{display:none;position:absolute;top:72px;left:0;right:0;background:var(--bg-card);flex-direction:column;padding:24px;gap:16px;border-radius:0 0 var(--radius) var(--radius)}.nav.open{display:flex}.menu-toggle{display:block}}
/* Hero Banner 渐变 + 轮播 */
.hero{position:relative;padding:80px 0 100px;background:linear-gradient(135deg,#0b0f1c 0%,#1a2a4a 50%,#2c4370 100%);overflow:hidden;color:white}.hero .container{position:relative;z-index:2}.hero h1{font-size:clamp(2.6rem,8vw,4.8rem);font-weight:800;line-height:1.1;margin-bottom:20px;letter-spacing:-0.02em}.hero p{font-size:1.25rem;max-width:600px;opacity:0.8;margin-bottom:36px}.hero .btn{margin-right:12px}.hero-slide-indicator{display:flex;gap:10px;margin-top:40px}.hero-slide-indicator span{width:40px;height:4px;border-radius:4px;background:rgba(255,255,255,0.3);transition:0.3s}.hero-slide-indicator span.active{background:var(--accent);width:60px}.hero-bg-shapes{position:absolute;inset:0;opacity:0.1;pointer-events:none}.hero-bg-shapes svg{width:100%;height:100%}
/* 卡片、数字动画、滚动动画 */
.animate-on-scroll{opacity:0;transform:translateY(30px);transition:opacity 0.7s ease,transform 0.7s ease}.animate-on-scroll.visible{opacity:1;transform:translateY(0)}.counter{font-size:2.8rem;font-weight:800;color:var(--accent);letter-spacing:-0.02em}.stat-card{text-align:center;padding:32px 16px}.stat-card p{color:var(--text-light)}.faq-item{border-bottom:1px solid rgba(255,255,255,0.08);padding:20px 0;cursor:pointer}.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 0.4s ease,opacity 0.3s;opacity:0;padding-top:8px;color:var(--text-light)}.faq-item.open .faq-answer{max-height:300px;opacity:1}.footer{background:var(--brand);color:#ccd9f0;padding:48px 0 24px;margin-top:60px}.footer a{color:#a0b9e0}.footer a:hover{color:var(--accent)}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px}.footer-bottom{border-top:1px solid rgba(255,255,255,0.05);padding-top:24px;margin-top:32px;font-size:0.9rem;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px}
/* 轮播简单实现 */
.carousel{overflow:hidden;position:relative;border-radius:var(--radius)}.carousel-track{display:flex;transition:transform 0.5s ease}.carousel-item{min-width:100%;padding:0 4px}.carousel-controls{display:flex;justify-content:center;gap:12px;margin-top:20px}.carousel-dot{width:12px;height:12px;border-radius:50%;background:var(--text-light);border:none;cursor:pointer;transition:0.2s}.carousel-dot.active{background:var(--accent);transform:scale(1.2)}
/* 返回顶部 */
#backToTop{position:fixed;bottom:30px;right:30px;width:48px;height:48px;border-radius:50%;background:var(--accent);color:#0b0f1c;font-size:1.8rem;border:none;cursor:pointer;box-shadow:0 8px 20px rgba(0,0,0,0.3);display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transition:0.3s;z-index:999}#backToTop.show{opacity:1;visibility:visible}
```