/* 全局重置 & 设计系统 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--brand1:#0f172a;--brand2:#1e293b;--accent:#facc15;--accent2:#eab308;--glass:rgba(255,255,255,0.08);--glass-border:rgba(255,255,255,0.12);--radius:20px;--shadow:0 20px 40px -12px rgba(0,0,0,0.3);--transition:0.3s cubic-bezier(0.25,0.1,0.25,1);--font-base:'Inter',system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;--bg:#ffffff;--text:#0f172a;--card-bg:#f8fafc;--footer-bg:#0f172a;--footer-text:#cbd5e1;--muted:#64748b}
.dark-mode{--bg:#0b1120;--text:#e2e8f0;--card-bg:#1e293b;--footer-bg:#020617;--muted:#94a3b8}
body{font-family:var(--font-base);background:var(--bg);color:var(--text);line-height:1.6;transition:background 0.2s,color 0.2s;scroll-behavior:smooth}
a{color:inherit;text-decoration:none}
ul{list-style:none}
img,svg{display:block;max-width:100%;height:auto}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
/* 玻璃效果 */
.glass{background:var(--glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid var(--glass-border);border-radius:var(--radius)}
/* 渐变Banner */
.gradient-bg{background:linear-gradient(135deg,#0f172a 0%,#1e293b 50%,#0f172a 100%);position:relative;overflow:hidden}
.gradient-bg::after{content:'';position:absolute;top:-40%;left:-20%;width:70%;height:120%;background:radial-gradient(circle at 30% 50%,rgba(250,204,21,0.08),transparent 60%);pointer-events:none}
/* 圆角 & 阴影 */
.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:2rem;transition:transform 0.2s,box-shadow 0.2s}
.card:hover{transform:translateY(-4px);box-shadow:0 24px 48px -12px rgba(0,0,0,0.4)}
/* 按钮 */
.btn{display:inline-flex;align-items:center;gap:0.5rem;background:var(--accent);color:#0f172a;font-weight:600;padding:0.75rem 2rem;border-radius:40px;border:none;cursor:pointer;transition:all 0.2s;box-shadow:0 4px 12px rgba(250,204,21,0.3)}
.btn:hover{background:var(--accent2);transform:scale(1.02);box-shadow:0 8px 20px rgba(250,204,21,0.4)}
/* 导航吸顶 */
.sticky-header{position:sticky;top:0;z-index:100;background:rgba(15,23,42,0.85);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid rgba(255,255,255,0.06)}
.nav-wrapper{display:flex;align-items:center;justify-content:space-between;padding:0.8rem 0;flex-wrap:wrap}
.logo svg{height:36px;width:auto}
.nav-links{display:flex;gap:2rem;font-weight:500;color:#e2e8f0}
.nav-links a{position:relative;padding:0.25rem 0;transition:color 0.2s}
.nav-links a::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background:var(--accent);transition:width 0.2s}
.nav-links a:hover,.nav-links a.active{color:var(--accent)}.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.mobile-toggle{display:none;background:none;border:none;color:#fff;font-size:1.8rem;cursor:pointer}
.dark-toggle{background:rgba(255,255,255,0.08);border:1px solid rgba(255,255,255,0.15);border-radius:40px;color:#facc15;padding:0.4rem 1rem;font-size:0.9rem;cursor:pointer;transition:0.2s}
.dark-toggle:hover{background:var(--accent);color:#0f172a}
/* Hero 轮播 */
.hero-carousel{position:relative;width:100%;overflow:hidden;border-radius:0 0 var(--radius) var(--radius)}
.hero-slide{display:none;padding:5rem 0 4rem;animation:fadeIn 0.6s ease}
.hero-slide.active{display:block}
@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}100%{opacity:1;transform:translateY(0)}}
.hero-content{max-width:680px;color:#fff}
.hero-content h1{font-size:clamp(2.2rem,6vw,4rem);font-weight:800;line-height:1.2;margin-bottom:1rem}
.hero-content p{font-size:1.2rem;color:#cbd5e1;margin-bottom:2rem}
.hero-indicators{display:flex;gap:0.5rem;margin-top:2rem}
.hero-indicators span{width:40px;height:4px;background:rgba(255,255,255,0.3);border-radius:4px;cursor:pointer;transition:0.2s}
.hero-indicators span.active{background:var(--accent);width:60px}
/* 通用section */
section{padding:4rem 0}
.section-title{font-size:2rem;font-weight:700;margin-bottom:2rem;position:relative;display:inline-block}
.section-title::after{content:'';display:block;width:60px;height:4px;background:var(--accent);margin-top:0.5rem;border-radius:4px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:2.5rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:2rem}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1.8rem}
/* 数字动画 */
.stat-number{font-size:2.8rem;font-weight:800;color:var(--accent);line-height:1.2}
/* FAQ折叠 */
.faq-item{border-bottom:1px solid rgba(0,0,0,0.08);padding:1rem 0;cursor:pointer}
.dark-mode .faq-item{border-color:rgba(255,255,255,0.08)}
.faq-question{font-weight:600;display:flex;justify-content:space-between;align-items:center}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.35s ease;color:var(--muted);padding-top:0.5rem}
.faq-item.open .faq-answer{max-height:300px}
/* 滚动动画 */
.reveal{opacity:0;transform:translateY(30px);transition:opacity 0.7s ease,transform 0.7s ease}
.reveal.visible{opacity:1;transform:translateY(0)}
/* 页脚 */
footer{background:var(--footer-bg);color:var(--footer-text);padding:3rem 0 2rem;font-size:0.95rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem}
footer a{color:#94a3b8;transition:color 0.2s}footer a:hover{color:var(--accent)}
/* 响应式 */
@media(max-width:1024px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr 1fr}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:768px){.nav-links{display:none;width:100%;flex-direction:column;gap:0.8rem;padding:1rem 0}.nav-links.open{display:flex}.mobile-toggle{display:block}.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.hero-content h1{font-size:2.2rem}}
/* 额外组件 */
.badge{background:var(--accent);color:#0f172a;padding:0.2rem 1rem;border-radius:40px;font-weight:600;font-size:0.85rem;display:inline-block}
.contact-block p{margin:0.4rem 0}
/* 图片占位SVG风格（内联） */
.icon-svg{width:48px;height:48px;fill:var(--accent);margin-bottom:0.5rem}