/* ===== 全局重置与设计系统 ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--brand-primary:#0b1a2e;--brand-secondary:#e5b87b;--brand-accent:#c79a5e;--glass-bg:rgba(255,255,255,0.06);--glass-border:rgba(255,255,255,0.12);--shadow-sm:0 8px 32px rgba(0,0,0,0.2);--radius-lg:24px;--radius-md:16px;--radius-sm:12px;--transition:all 0.3s cubic-bezier(0.4,0,0.2,1);--font-sans:'Segoe UI','PingFang SC','Microsoft YaHei',system-ui,sans-serif;--max-w:1280px;--header-h:76px;--bg-page:#f5f7fb;--text-body:#1f2a3f;--text-light:#4a5b74;--card-bg:#ffffff;--border-light:#e9edf4;--dark-bg:#0d1b2a;--dark-card:#162233;--dark-text:#e2e8f0;--dark-light:#94a3b8}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:var(--font-sans);background:var(--bg-page);color:var(--text-body);line-height:1.6;transition:background 0.4s,color 0.4s}
body.dark{background:var(--dark-bg);color:var(--dark-text)}
body.dark .card{background:var(--dark-card);border-color:rgba(255,255,255,0.08)}
body.dark .section-title{color:#f1f5f9}
body.dark .text-muted{color:var(--dark-light)}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}
/* ===== 玻璃效果卡片 ===== */
.card{background:var(--card-bg);border-radius:var(--radius-md);box-shadow:0 4px 20px rgba(0,0,0,0.04);padding:28px 24px;border:1px solid var(--border-light);transition:var(--transition)}
.card:hover{box-shadow:0 12px 40px rgba(0,0,0,0.08);transform:translateY(-2px)}
/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:60px;font-weight:600;border:none;background:var(--brand-secondary);color:#0b1a2e;cursor:pointer;transition:var(--transition);font-size:0.95rem}
.btn:hover{background:var(--brand-accent);transform:scale(1.02);box-shadow:0 8px 24px rgba(229,184,123,0.3)}
.btn-outline{background:transparent;border:1.5px solid var(--brand-secondary);color:var(--brand-secondary)}
.btn-outline:hover{background:var(--brand-secondary);color:#0b1a2e}
/* ===== 标题 ===== */
.section-title{font-size:2.2rem;font-weight:700;margin-bottom:0.5rem;letter-spacing:-0.02em;color:var(--text-body)}
.section-sub{font-size:1.05rem;color:var(--text-light);max-width:640px;margin-bottom:2.5rem}
.text-center{text-align:center}
.mx-auto{margin-left:auto;margin-right:auto}
/* ===== 网格 ===== */
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px}
.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(200px,1fr));gap:24px}
/* ===== header ===== */
.header{position:fixed;top:0;left:0;width:100%;height:var(--header-h);background:rgba(11,26,46,0.85);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);border-bottom:1px solid rgba(255,255,255,0.06);z-index:1000;transition:var(--transition)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:12px;font-size:1.6rem;font-weight:700;color:#fff}
.logo svg{width:40px;height:40px}
.nav{display:flex;gap:8px;align-items:center}
.nav a{padding:8px 16px;border-radius:40px;color:rgba(255,255,255,0.8);font-size:0.9rem;font-weight:500;transition:var(--transition)}
.nav a:hover,.nav a.active{background:rgba(229,184,123,0.15);color:var(--brand-secondary)}
.dark-toggle{background:rgba(255,255,255,0.08);border:0;width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;color:#fff;font-size:1.2rem;transition:var(--transition)}
.dark-toggle:hover{background:var(--brand-secondary);color:#0b1a2e}
.mobile-menu{display:none;background:transparent;border:0;color:#fff;font-size:1.8rem;cursor:pointer}
/* ===== hero ===== */
.hero{min-height:100vh;background:linear-gradient(145deg,#0b1a2e 0%,#1b2f4a 100%);display:flex;align-items:center;padding:120px 0 80px;position:relative;overflow:hidden}
.hero::after{content:'';position:absolute;top:-30%;right:-10%;width:600px;height:600px;border-radius:50%;background:radial-gradient(circle,rgba(229,184,123,0.08),transparent 70%)}
.hero .container{position:relative;z-index:2}
.hero h1{font-size:3.8rem;font-weight:800;line-height:1.2;color:#fff;max-width:860px;margin-bottom:24px}
.hero p{font-size:1.2rem;color:rgba(255,255,255,0.7);max-width:640px;margin-bottom:40px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap}
/* ===== 通用区块 ===== */
section{padding:80px 0}
/* ===== 数字动画 ===== */
.stat-item{text-align:center}
.stat-number{font-size:3rem;font-weight:800;color:var(--brand-secondary);line-height:1.2}
.stat-label{color:var(--text-light);font-size:0.95rem;margin-top:6px}
/* ===== 轮播 ===== */
.carousel{overflow:hidden;border-radius:var(--radius-lg);position:relative}
.carousel-inner{display:flex;transition:transform 0.5s ease}
.carousel-item{min-width:100%;padding:0 12px}
.carousel-item .card{min-height:200px;display:flex;flex-direction:column;justify-content:center}
.carousel-controls{display:flex;justify-content:center;gap:16px;margin-top:24px}
.carousel-btn{background:var(--brand-secondary);border:0;width:44px;height:44px;border-radius:50%;font-size:1.4rem;cursor:pointer;color:#0b1a2e;transition:var(--transition)}
.carousel-btn:hover{background:var(--brand-accent)}
/* ===== 文章卡片 ===== */
.article-card .date{color:var(--text-light);font-size:0.85rem;margin-bottom:8px}
.article-card h3{font-size:1.2rem;margin-bottom:8px}
.article-card p{color:var(--text-light);font-size:0.95rem;margin-bottom:16px}
/* ===== FAQ ===== */
.faq-item{border-bottom:1px solid var(--border-light);padding:16px 0}
.faq-question{display:flex;justify-content:space-between;align-items:center;cursor:pointer;font-weight:600;font-size:1.05rem}
.faq-answer{padding-top:12px;color:var(--text-light);display:none;line-height:1.7}
.faq-item.open .faq-answer{display:block}
/* ===== 页脚 ===== */
.footer{background:var(--brand-primary);color:rgba(255,255,255,0.7);padding:48px 0 24px;margin-top:40px}
.footer a{color:rgba(255,255,255,0.6);transition:var(--transition)}
.footer a:hover{color:var(--brand-secondary)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:32px;margin-bottom:32px}
.footer-bottom{border-top:1px solid rgba(255,255,255,0.08);padding-top:24px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:0.85rem}
/* ===== 响应式 ===== */
@media(max-width:1024px){.hero h1{font-size:2.8rem}}
@media(max-width:768px){
  .nav{display:none}
  .mobile-menu{display:block}
  .nav.open{display:flex;flex-direction:column;position:absolute;top:var(--header-h);left:0;width:100%;background:rgba(11,26,46,0.98);backdrop-filter:blur(20px);padding:20px;gap:4px}
  .hero h1{font-size:2.2rem}
  .section-title{font-size:1.8rem}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:480px){.hero h1{font-size:1.8rem}.hero-actions .btn{width:100%;justify-content:center}}
/* ===== 滚动动画 ===== */
.animate-on-scroll{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease,transform 0.6s ease}
.animate-on-scroll.visible{opacity:1;transform:translateY(0)}
/* ===== 返回顶部 ===== */
#backTop{position:fixed;bottom:30px;right:30px;width:48px;height:48px;border-radius:50%;background:var(--brand-secondary);border:0;font-size:1.6rem;cursor:pointer;color:#0b1a2e;box-shadow:0 4px 16px rgba(0,0,0,0.15);display:none;align-items:center;justify-content:center;z-index:999;transition:var(--transition)}
#backTop:hover{background:var(--brand-accent);transform:scale(1.05)}