/* --- 基础重置 --- */ 
* { margin: 0; padding: 0; box-sizing: border-box; } 
body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; color: #333; line-height: 1.5; } 
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; } 

/* --- 导航栏基础样式 --- */ 
header.site-header { position: fixed; top: 0; width: 100%; z-index: 9999; padding: 25px 0; transition: all 0.4s ease; background: transparent; } 
header.scrolled { background: rgba(255, 255, 255, 0.98); padding: 12px 0; box-shadow: 0 4px 15px rgba(0,0,0,0.08); } 
.navbar { display: flex; justify-content: space-between; align-items: center; } 

/* Logo 切换逻辑 */ 
.logo img { height: 70px; width: auto; transition: 0.3s; } 
header.scrolled .logo img { height: 55px; } 

.logo .logo-dark { display: none; } 
header.scrolled .logo .logo-light { display: none; } 
header.scrolled .logo .logo-dark { display: block; } 

/* 菜单列表 (PC) */ 
.nav-list { display: flex; list-style: none; margin: 0; padding: 0; } 
.nav-list li { margin-left: 35px; } 
.nav-list li a { text-decoration: none; font-size: 16px; font-weight: 500; color: #ffffff; transition: 0.3s; position: relative; } 
header.scrolled .nav-list li a { color: #333333; } 
.nav-list li a:hover { color: #0073aa !important; } 

/* --- 移动端汉堡包按钮 --- */ 
.menu-toggle { display: none; flex-direction: column; justify-content: space-between; width: 30px; height: 21px; background: transparent; border: none; cursor: pointer; z-index: 1001; } 
.menu-toggle .bar { width: 100%; height: 3px; background-color: #fff; transition: all 0.3s; } 
header.scrolled .menu-toggle .bar { background-color: #333; } 

/* --- 移动端响应式处理 --- */ 
@media (max-width: 992px) { 
    .menu-toggle { display: flex; } 

    header.site-header.mobile-menu-open { background: #fff !important; } 
    header.mobile-menu-open .menu-toggle .bar { background-color: #333 !important; } 
    header.mobile-menu-open .logo .logo-light { display: none; } 
    header.mobile-menu-open .logo .logo-dark { display: block; } 

    .menu-toggle.is-active .bar:nth-child(1) { transform: translateY(9px) rotate(45deg); } 
    .menu-toggle.is-active .bar:nth-child(2) { opacity: 0; } 
    .menu-toggle.is-active .bar:nth-child(3) { transform: translateY(-9px) rotate(-45deg); } 

    .main-navigation { 
        position: absolute; top: 100%; left: 0; width: 100%; background: #fff; 
        max-height: 0; overflow: hidden; transition: max-height 0.4s ease-in-out; 
    } 
    .main-navigation.is-active { max-height: 100vh; border-top: 1px solid #eee; } 

    .nav-list { flex-direction: column; padding: 20px 0; } 
    .nav-list li { margin: 0; text-align: center; } 
    .nav-list li a { color: #333 !important; padding: 15px; display: block; border-bottom: 1px solid #f9f9f9; } 
}

/* 滚动动画 */
.reveal-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    will-change: opacity, transform;
}
.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}
.stats-grid.reveal-on-scroll {
    transition-delay: 0.3s;
}

/* --- Swiper 控件 --- */
.hero-slider .swiper-slide { transition-timing-function: linear; }
.hero-video-container { position: relative; width: 100%; height: 100vh; overflow: hidden; }
.hero-bg-video { width: 100%; height: 100%; object-fit: cover; }

.hero-slider .swiper-button-next,
.hero-slider .swiper-button-prev {
    color: #ffffff !important;
    z-index: 100 !important;
    display: flex !important;
}
.hero-slider .swiper-button-next::after,
.hero-slider .swiper-button-prev::after { font-size: 24px; font-weight: bold; }
.hero-slider .swiper-button-next:hover,
.hero-slider .swiper-button-prev:hover { color: #0073aa !important; transform: scale(1.1); }

.hero-slider .swiper-pagination { bottom: 30px !important; z-index: 100; }
.hero-slider .swiper-pagination-bullet { background: #ffffff !important; opacity: 0.5; width: 12px; height: 12px; margin: 0 6px !important; }
.hero-slider .swiper-pagination-bullet-active { opacity: 1; transform: scale(1.2); }

.hero-video-container { z-index: 1; }
.hero-content { z-index: 10; }