```css
/* ===== 全局重置与基础 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Arial', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    background: #fafafa;
    color: #222;
    transition: background 0.4s ease, color 0.4s ease;
    min-height: 100vh;
}

/* ===== 暗色模式 ===== */
body.dark-mode {
    background: #0d0d1a;
    color: #e0e0e0;
}

body.dark-mode .team-grid > div,
body.dark-mode .product-grid > div {
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}

body.dark-mode .brand-stats > div,
body.dark-mode .stats-grid > div {
    background: linear-gradient(135deg, #1a1a2e, #2a2a4e);
    border: 1px solid rgba(212,175,55,0.3);
}

body.dark-mode section {
    background: rgba(255,255,255,0.02);
    border-radius: 24px;
    backdrop-filter: blur(4px);
}

body.dark-mode footer {
    background: #0a0a14;
    border-top: 1px solid rgba(212,175,55,0.2);
}

body.dark-mode .faq-item {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
}

/* ===== 头部导航 ===== */
header {
    background: rgba(26, 26, 46, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 0.75rem 1rem;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(212,175,55,0.15);
    transition: background 0.3s ease;
}

body.dark-mode header {
    background: rgba(10, 10, 20, 0.95);
}

nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    gap: 1rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #d4af37;
    transition: width 0.3s ease;
}

nav ul li a:hover::after,
nav ul li a.active::after {
    width: 100%;
}

nav ul li a:hover {
    color: #d4af37;
}

nav a.active {
    color: #d4af37;
}

nav button {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background 0.3s ease, transform 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

nav button:hover {
    background: rgba(255,255,255,0.1);
    transform: scale(1.1);
}

#mobile-menu-toggle {
    display: none;
    background: transparent;
    border: none;
    color: #fff;
    font-size: 1.8rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
}

/* ===== 主内容区域 ===== */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

section {
    padding: 3rem 1rem;
    margin: 2rem 0;
    border-radius: 24px;
    background: rgba(255,255,255,0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.04);
    transition: all 0.4s ease;
    border: 1px solid rgba(255,255,255,0.3);
}

section:hover {
    box-shadow: 0 12px 48px rgba(0,0,0,0.08);
    transform: translateY(-2px);
}

body.dark-mode section:hover {
    box-shadow: 0 12px 48px rgba(0,0,0,0.4);
}

h1, h2, h3 {
    margin-bottom: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 2.2rem;
    background: linear-gradient(135deg, #1a1a2e, #d4af37);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: 1.8rem;
    color: #1a1a2e;
    position: relative;
    display: inline-block;
    padding-bottom: 0.5rem;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #d4af37, #1a1a2e);
    border-radius: 4px;
}

body.dark-mode h2 {
    color: #f0f0f0;
}

body.dark-mode h2::after {
    background: linear-gradient(90deg, #d4af37, #f0f0f0);
}

p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
    line-height: 1.8;
}

/* ===== Banner 滑块 (渐变+毛玻璃) ===== */
.banner-slider {
    position: relative;
    overflow: hidden;
    height: 600px;
    border-radius: 24px;
    margin-bottom: 2rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity;
}

.slide.active {
    opacity: 1;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* ===== 统计卡片 (渐变+毛玻璃) ===== */
.brand-stats,
.stats-grid {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
    padding: 1rem 0;
}

.brand-stats > div,
.stats-grid > div {
    background: linear-gradient(135deg, #1a1a2e, #3a3a5e);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    color: #fff;
    min-width: 160px;
    text-align: center;
    font-size: 1.2rem;
    font-weight: 600;
    backdrop-filter: blur(4px);
    border: 1px solid rgba(212,175,55,0.2);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    transition: all 0.4s ease;
    flex: 1 1 160px;
}

.brand-stats > div:hover,
.stats-grid > div:hover {
    transform: translateY(-6px) scale(1.02);
    box-shadow: 0 16px 48px rgba(212,175,55,0.2);
}

.stat-number {
    display: block;
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, #d4af37, #f5e6a3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

/* ===== 团队 & 产品网格 (圆角卡片+毛玻璃) ===== */
.team-grid,
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    padding: 1rem 0;
}

.team-grid > div,
.product-grid > div {
    background: rgba(255,255,255,0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 20px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.06);
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid rgba(255,255,255,0.5);
    will-change: transform;
}

.team-grid > div:hover,
.product-grid > div:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(0,0,0,0.12);
    border-color: rgba(212,175,55,0.4);
}

.team-grid img,
.product-grid img {
    width: 100%;
    max-width: 200px;
    height: auto;
    border-radius: 16px;
    margin-bottom: 1rem;
    transition: transform 0.4s ease;
}

.team-grid > div:hover img,
.product-grid > div:hover img {
    transform: scale(1.05);
}

.team-grid h3,
.product-grid h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: #1a1a2e;
}

body.dark-mode .team-grid h3,
body.dark-mode .product-grid h3 {
    color: #f0f0f0;
}

.team-grid p {
    font-size: 0.95rem;
    color: #888;
}

/* ===== FAQ 折叠 ===== */
.faq-item {
    background: rgba(255,255,255,0.5);
    backdrop-filter: blur(8px);
    border-radius: 16px;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1rem;
    border: 1px solid rgba(0,0,0,0.04);
    transition: all 0.3s ease;
}

.faq-item:hover {
    background: rgba(255,255,255,0.7);
    box-shadow: 0 4px 16px rgba(0,0,0,0.04);
}

.faq-item h3 {
    cursor: pointer;
    font-size: 1.15rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0;
    padding-right: 2rem;
    position: relative;
}

.faq-item h3::after {
    content: '+';
    font-size: 1.5rem;
    color: #d4af37;
    position: absolute;
    right: 0;
    transition: transform 0.3s ease;
}

.faq-item h3.active::after {
    transform: rotate(45deg);
}

.faq-item p {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(0,0,0,0.06);
    font-size: 1rem;
}

.faq-item p.open {
    display: block;
    animation: fadeIn 0.3s ease;
}

/* ===== 新闻卡片 ===== */
#news article,
#latest-articles article,
#related-articles article {
    background: rgba(255,255,255,0.6);
    backdrop-filter: blur(8px);
    border-radius: 20px;
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(255,255,255,0.4);
    transition: all 0.3s ease;
    box-shadow: 0 4px 16px rgba(0,0,0,0.03);
}

#news article:hover,
#latest-articles article:hover,
#related-articles article:hover {
    transform: translateX(6px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.08);
}

#news time {
    display: block;
    font-size: 0.9rem;
    color: #999;
    margin-top: 0.5rem;
}

body.dark-mode #news time {
    color: #aaa;
}

/* ===== 联系区块 ===== */
#contact p {
    background: rgba(255,255,255,0.4);
    backdrop-filter: blur(6px);
    padding: 0.75rem 1.25rem;
    border-radius: 12px;
    display: inline-block;
    margin-right: 0.5rem;
    border: 1px solid rgba(255,255,255,0.3);
}

body.dark-mode #contact p {
    background: rgba(255,255,255,0.06);
}

/* ===== 页脚 ===== */
footer {
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(20px);
    color: #fff;
    padding: 3rem 2rem 2rem;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid rgba(212,175,55,0.15);
}

footer .footer-links ul,
footer .sitemap ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

footer a {
    color: #d4af37;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease, opacity 0.3s ease;
    opacity: 0.85;
}

footer a:hover {
    color: #f5e6a3;
    opacity: 1;
}

footer .privacy-policy {
    margin: 1.5rem 0;
    font-size: 0.9rem;
}

footer p {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 0.5rem;
}

/* ===== 返回顶部按钮 ===== */
#back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: linear-gradient(135deg, #d4af37, #b8942e);
    color: #1a1a2e;
    border: none;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    font-size: 1.6rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 24px rgba(212,175,55,0.3);
    transition: all 0.3s ease;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

#back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#back-to-top:hover {
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 12px 36px rgba(212,175,55,0.4);
}

/* ===== 滚动动画 (Intersection Observer 配合) ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
    .banner-slider {
        height: 450px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    section {
        padding: 2rem 1rem;
    }
}

@media (max-width: 768px) {
    #mobile-menu-toggle {
        display: block;
    }
    
    nav ul {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        border-bottom: 1px solid rgba(212,175,55,0.2);
        box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    
    nav ul.open {
        display: flex;
    }
    
    nav ul li a {
        font-size: 1.1rem;
        padding: 0.75rem 0;
    }
    
    .banner-slider {
        height: 300px;
        border-radius: 16px;
    }
    
    .brand-stats,
    .stats-grid {
        gap: 1rem;
    }
    
    .brand-stats > div,
    .stats-grid > div {
        min-width: 120px;
        padding: 1.5rem 1rem;
        flex: 1 1 120px;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .team-grid,
    .product-grid {
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1.25rem;
    }
    
    section {
        padding: 1.5rem 0.75rem;
        margin: 1.5rem 0;
        border-radius: 16px;
    }
    
    #back-to-top {
        width: 48px;
        height: 48px;
        font-size: 1.3rem;
        bottom: 1.5rem;
        right: 1.5rem;
    }
    
    footer .footer-links ul,
    footer .sitemap ul {
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .banner-slider {
        height: 220px;
    }
    
    h1 {
        font-size: 1.5rem;
    }
    
    h2 {
        font-size: 1.3rem;
    }
    
    .team-grid,
    .product-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .brand-stats > div,
    .stats-grid > div {
        min-width: 100px;
        flex: 1 1 100px;
    }
    
    .stat-number {
        font-size: 1.6rem;
    }
}

/* ===== 关键帧动画 ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(40px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== 工具类 ===== */
.text-center {
    text-align: center;
}

.mt-2 {
    margin-top: 2rem;
}

.mb-2 {
    margin-bottom: 2rem;
}

/* ===== 图片懒加载占位 ===== */
img[loading="lazy"] {
    transition: opacity 0.4s ease;
}

img[loading="lazy"]:not([src]) {
    opacity: 0;
}

/* ===== 暗色模式下的微调 ===== */
body.dark-mode .faq-item h3::after {
    color: #f5e6a3;
}

body.dark-mode #news article,
body.dark-mode #latest-articles article,
body.dark-mode #related-articles article {
    background: rgba(255,255,255,0.04);
    border-color: rgba(255,255,255,0.06);
}

body.dark-mode #contact p {
    border-color: rgba(255,255,255,0.08);
}
```