/* ==========================================================================
   CSS Variables - 主题变量管理
   ========================================================================== */
:root {
    /* 主色调 */
    --color-primary: rgb(96, 158, 233);
    --color-primary-dark: rgb(13, 97, 159);
    --color-primary-light: rgb(137, 193, 245);
    
    /* 辅助色 */
    --color-accent: rgb(255, 153, 0);
    --color-success: rgb(76, 175, 80);
    
    /* 中性色 */
    --color-white: rgb(255, 255, 255);
    --color-black: rgb(0, 0, 0);
    --color-gray-100: rgb(248, 249, 250);
    --color-gray-200: rgb(233, 236, 239);
    --color-gray-300: rgb(222, 226, 230);
    --color-gray-500: rgb(102, 102, 102);
    --color-gray-600: rgb(68, 68, 68);
    --color-gray-800: rgb(51, 51, 51);
    
    /* 背景色 */
    --bg-primary: var(--color-white);
    --bg-secondary: var(--color-gray-100);
    --bg-dark: rgb(26, 35, 49);
    
    /* 字体 */
    --font-family: 'Noto Sans SC', system-ui, -apple-system, 'Microsoft YaHei', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.15);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 容器 */
    --container-max: 1200px;
    
    /* 头部高度 */
    --header-height: 80px;
}

/* ==========================================================================
   Base Reset & Typography
   ========================================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* ==========================================================================
   Layout Components
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ==========================================================================
   Header - 头部导航
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-primary);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}

.header__container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary-dark);
}

.header__logo-icon {
    width: 40px;
    height: 40px;
}

.header__logo-text {
    display: flex;
    flex-direction: column;
}

.header__logo-cn {
    font-size: var(--font-size-lg);
    font-weight: 700;
    line-height: 1.2;
}

.header__logo-en {
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    letter-spacing: 0.5px;
}

/* Navigation Menu */
.header__nav {
    display: none;
}

@media (min-width: 1024px) {
    .header__nav {
        display: block;
    }
}

.header__menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.header__menu-item {
    position: relative;
}

.header__menu-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) 0;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-800);
}

.header__menu-link:hover {
    color: var(--color-primary);
}

.header__dropdown-icon {
    width: 12px;
    height: 12px;
    transition: transform var(--transition-fast);
}

.header__menu-item--dropdown:hover .header__dropdown-icon {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.header__dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 160px;
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
}

.header__menu-item--dropdown:hover .header__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.header__dropdown li a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.header__dropdown li a:hover {
    background-color: var(--bg-secondary);
    color: var(--color-primary);
}

/* Header Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header__lang,
.header__phone,
.header__search {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    color: var(--color-gray-600);
    transition: all var(--transition-fast);
}

.header__lang:hover,
.header__phone:hover,
.header__search:hover {
    background-color: var(--bg-secondary);
    color: var(--color-primary);
}

.header__lang svg,
.header__phone svg,
.header__search svg {
    width: 20px;
    height: 20px;
}

.header__lang span {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Mobile Menu Toggle */
.header__menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    gap: 5px;
}

@media (min-width: 1024px) {
    .header__menu-toggle {
        display: none;
    }
}

.header__menu-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-gray-800);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

.header__menu-toggle--active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.header__menu-toggle--active span:nth-child(2) {
    opacity: 0;
}

.header__menu-toggle--active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================================================
   Mobile Navigation
   ========================================================================== */
.mobile-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

.mobile-nav--active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-nav__menu li {
    border-bottom: 1px solid var(--color-gray-200);
}

.mobile-nav__menu li a {
    display: block;
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-base);
    font-weight: 500;
}

.mobile-nav__lang {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.mobile-nav__lang svg {
    width: 20px;
    height: 20px;
}

/* ==========================================================================
   Banner - 轮播区域
   ========================================================================== */
.banner {
    position: relative;
    height: 100vh;
    min-height: 600px;
    max-height: 900px;
    margin-top: var(--header-height);
    overflow: hidden;
}

.banner__slides {
    position: relative;
    height: 100%;
}

.banner__slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 50%, var(--color-primary-dark) 100%);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.banner__slide--active {
    opacity: 1;
    visibility: visible;
}

.banner__content {
    max-width: var(--container-max);
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--color-white);
}

.banner__title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-lg);
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease 0.2s;
}

.banner__slide--active .banner__title {
    opacity: 1;
    transform: translateY(0);
}

.banner__subtitle {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.9;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease 0.4s;
}

.banner__slide--active .banner__subtitle {
    opacity: 0.9;
    transform: translateY(0);
}

.banner__btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-2xl);
    background-color: var(--color-white);
    color: var(--color-primary-dark);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-full);
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease 0.6s, background-color var(--transition-fast), transform var(--transition-fast);
}

.banner__slide--active .banner__btn {
    opacity: 1;
    transform: translateY(0);
}

.banner__btn:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.banner__btn--outline {
    background-color: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-white);
}

.banner__btn--outline:hover {
    background-color: var(--color-white);
    color: var(--color-primary-dark);
    border-color: var(--color-white);
}

.banner__actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease 0.6s;
}

.banner__slide--active .banner__actions {
    opacity: 1;
    transform: translateY(0);
}

.banner__scroll-hint {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.6);
    animation: bounce 2s infinite;
    z-index: 5;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

/* Banner Dots */
.banner__dots {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-sm);
}

.banner__dot {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.5);
    transition: all var(--transition-base);
}

.banner__dot--active {
    background-color: var(--color-white);
    transform: scale(1.2);
}

.banner__dot:hover {
    background-color: rgba(255, 255, 255, 0.8);
}

/* Banner Arrows */
.banner__arrows {
    display: none;
}

@media (min-width: 768px) {
    .banner__arrows {
        display: flex;
        position: absolute;
        top: 50%;
        left: 0;
        right: 0;
        transform: translateY(-50%);
        justify-content: space-between;
        padding: 0 var(--spacing-lg);
    }
}

.banner__arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--color-white);
    transition: all var(--transition-base);
}

.banner__arrow:hover {
    background-color: rgba(255, 255, 255, 0.4);
}

.banner__arrow svg {
    width: 24px;
    height: 24px;
}

/* ==========================================================================
   Section Header - 区块标题
   ========================================================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.section-header--left {
    text-align: left;
}

.section-header--light .section-header__title,
.section-header--light .section-header__desc {
    color: var(--color-white);
}

.section-header--light .section-header__tag {
    color: rgba(255,255,255,0.7);
}

.section-header__tag {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
    position: relative;
}

.section-header__tag::before {
    content: '';
    display: inline-block;
    width: 30px;
    height: 2px;
    background: var(--color-primary);
    margin-right: var(--spacing-sm);
    vertical-align: middle;
}

.section-header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-sm);
}

.section-header__desc {
    font-size: var(--font-size-base);
    color: var(--color-gray-500);
}

/* ==========================================================================
   Services - 服务模块
   ========================================================================== */
.services {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.services__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
}

@media (min-width: 640px) {
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .services__grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* Service Card */
.service-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
}

.service-card--visible {
    opacity: 1;
    transform: translateY(0);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.service-card__bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 120px;
    opacity: 0.5;
    z-index: 0;
}

.service-card__icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-dark);
    position: relative;
    z-index: 1;
}

.service-card__icon svg {
    width: 100%;
    height: 100%;
}

.service-card__title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-sm);
    position: relative;
    z-index: 1;
}

.service-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.service-card__list {
    list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-lg);
    position: relative;
    z-index: 1;
}

.service-card__list li {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-lg);
    position: relative;
}

.service-card__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background: var(--color-primary);
    border-radius: var(--radius-full);
}

.service-card__link {
    display: inline-flex;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
    position: relative;
    z-index: 1;
}

.service-card__link:hover {
    color: var(--color-primary-dark);
}

/* ==========================================================================
   About - 关于我们
   ========================================================================== */
.about {
    padding: var(--spacing-3xl) 0;
}

.about__wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

@media (min-width: 1024px) {
    .about__wrapper {
        grid-template-columns: 1fr 1fr;
    }
}

.about__content {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.8s ease;
}

.about__content--visible {
    opacity: 1;
    transform: translateX(0);
}

.about__text {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about__stats {
    display: flex;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-gray-200);
}

.stat {
    text-align: center;
}

.stat__number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat__label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.about__image {
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.8s ease 0.2s;
}

.about__image--visible {
    opacity: 1;
    transform: translateX(0);
}

.about__image-placeholder {
    background-color: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 4 / 3;
}

.about__image-placeholder svg {
    width: 100%;
    height: 100%;
}

.about__image-graphic {
    width: 100%;
    height: 100%;
}

.about__image-graphic svg {
    width: 100%;
    height: 100%;
    display: block;
}

.about__cert {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: linear-gradient(135deg, rgba(96,158,233,0.08), rgba(13,97,159,0.05));
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.about__cert svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
    flex-shrink: 0;
}

.about__cert span {
    font-size: var(--font-size-sm);
    color: var(--color-primary-dark);
    font-weight: 500;
}

.about__address {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(0,0,0,0.02);
    border-radius: var(--radius-md);
}

.about__address svg {
    width: 20px;
    height: 20px;
    color: var(--color-gray-500);
    flex-shrink: 0;
}

.about__address span {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    line-height: 1.6;
}

/* ==========================================================================
   Advantages - 核心优势
   ========================================================================== */
.advantages {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-primary);
}

.advantages__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-3xl);
}

@media (min-width: 640px) {
    .advantages__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .advantages__grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.advantage-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.advantage-card--visible {
    opacity: 1;
    transform: translateY(0);
}

.advantage-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.advantage-card__icon-wrap {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    color: var(--color-white);
    margin-bottom: var(--spacing-lg);
    transition: transform var(--transition-base);
}

.advantage-card:hover .advantage-card__icon-wrap {
    transform: scale(1.1) rotate(5deg);
}

.advantage-card__icon-wrap svg {
    width: 36px;
    height: 36px;
}

.advantage-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-sm);
}

.advantage-card__desc {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* Advantage Stats */
.advantages__stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .advantages__stats {
        grid-template-columns: repeat(4, 1fr);
    }
}

.stat-card {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    border-radius: var(--radius-lg);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base);
    opacity: 0;
    transform: translateY(20px);
}

.stat-card--visible {
    opacity: 1;
    transform: translateY(0);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.stat-card__number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 900;
    line-height: 1.2;
}

.stat-card__label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin-top: var(--spacing-xs);
}

/* ==========================================================================
   Belt & Road - 一带一路 (优化版)
   ========================================================================== */
.belt-road {
    position: relative;
    background: linear-gradient(135deg, #1a2332 0%, #0d2137 50%, #1a3a52 100%);
    min-height: 700px;
    overflow: hidden;
}

.belt-road::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1920 500'><path d='M0 250 Q480 150 960 250 T1920 250' stroke='white' fill='none' stroke-opacity='0.05' stroke-width='2'/><path d='M0 280 Q480 180 960 280 T1920 280' stroke='white' fill='none' stroke-opacity='0.03' stroke-width='1'/></svg>") center/cover;
    animation: pulse-light 4s ease-in-out infinite;
}

@keyframes pulse-light {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.belt-road__overlay {
    position: relative;
    z-index: 1;
    padding: var(--spacing-3xl) 0;
}

.belt-road__content {
    max-width: 1200px;
}

.belt-road__features {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .belt-road__features {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }
}

.belt-feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: var(--spacing-2xl);
    background: rgba(255,255,255,0.08);
    border-radius: var(--radius-xl);
    border: 1px solid rgba(255,255,255,0.12);
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(30px);
}

.belt-feature--visible {
    opacity: 1;
    transform: translateY(0);
}

.belt-feature:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.3);
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.belt-feature__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    flex-shrink: 0;
    margin-bottom: var(--spacing-lg);
    transition: all 0.4s ease;
    box-shadow: 0 8px 20px rgba(96, 158, 233, 0.4);
}

.belt-feature:hover .belt-feature__icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 30px rgba(96, 158, 233, 0.6);
}

.belt-feature__icon svg {
    width: 40px;
    height: 40px;
}

.belt-feature__content {
    flex: 1;
}

.belt-feature h4 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.belt-feature p {
    font-size: var(--font-size-base);
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
}

/* ==========================================================================
   Process - 服务流程
   ========================================================================== */
.process {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.process__timeline {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    position: relative;
}

@media (min-width: 768px) {
    .process__timeline {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .process__timeline::before {
        content: '';
        position: absolute;
        top: 45px;
        left: 10%;
        right: 10%;
        height: 2px;
        background: linear-gradient(90deg, var(--color-primary-light), var(--color-primary), var(--color-primary-dark));
        z-index: 0;
    }
}

.process-step {
    text-align: center;
    position: relative;
    z-index: 1;
    opacity: 0;
    transform: translateY(20px);
}

.process-step--visible {
    opacity: 1;
    transform: translateY(0);
}

.process-step__number {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.process-step__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-primary);
    box-shadow: var(--shadow-md);
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    transition: all var(--transition-base);
}

.process-step:hover .process-step__icon {
    transform: scale(1.1);
    box-shadow: var(--shadow-lg);
    color: var(--color-primary-dark);
}

.process-step__icon svg {
    width: 32px;
    height: 32px;
}

.process-step h4 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-xs);
}

.process-step p {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: 1.6;
}

/* ==========================================================================
   Partner Card Logo Update
   ========================================================================== */
.partner-card__logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    color: var(--color-white);
    font-weight: 700;
    font-size: var(--font-size-sm);
    letter-spacing: 1px;
    text-align: center;
}

/* ==========================================================================
   News Card Image (gradient version)
   ========================================================================== */
.news-card__image {
    overflow: hidden;
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.news-card__illustration {
    width: 100%;
    height: 100%;
    display: block;
    transition: transform 0.4s ease;
}

.news-card:hover .news-card__illustration {
    transform: scale(1.05);
}

.news-card__image::after {
    content: '';
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.news-card:hover .news-card__image::after {
    opacity: 0;
}

.news-card:hover .news-card__image img {
    transform: scale(1.05);
}

/* ==========================================================================
   Footer Social
   ========================================================================== */
.footer__social {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.7);
    transition: all var(--transition-fast);
}

.footer__social-link:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

.footer__social-link svg {
    width: 18px;
    height: 18px;
}

/* ==========================================================================
   Partners - 合作伙伴
   ========================================================================== */
.partners {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.partners__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (min-width: 640px) {
    .partners__grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (min-width: 1024px) {
    .partners__grid {
        grid-template-columns: repeat(8, 1fr);
    }
}

.partner-card {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    opacity: 0;
    transform: scale(0.9);
}

.partner-card--visible {
    opacity: 1;
    transform: scale(1);
}

.partner-card:hover {
    box-shadow: var(--shadow-md);
    transform: scale(1.05);
}

.partner-card span {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-500);
    text-align: center;
}

/* ==========================================================================
   News - 行业资讯 (优化版)
   ========================================================================== */
.news {
    padding: var(--spacing-3xl) 0;
}

.news__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

@media (min-width: 768px) {
    .news__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-xl);
    }
}

.news-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.4s ease;
    opacity: 0;
    transform: translateY(30px);
    border: 1px solid var(--color-gray-200);
}

.news-card--visible {
    opacity: 1;
    transform: translateY(0);
}

.news-card:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-8px);
    border-color: var(--color-primary);
}

.news-card__image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    min-height: 200px;
}

.news-card__image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.3) 100%);
    z-index: 1;
    pointer-events: none;
    transition: all 0.3s ease;
}

.news-card:hover .news-card__image::before {
    background: linear-gradient(180deg, transparent 30%, rgba(0,0,0,0.4) 100%);
}

.news-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(96,158,233,0.15) 0%, transparent 100%);
    z-index: 2;
    transition: opacity 0.3s ease;
}

.news-card:hover .news-card__overlay {
    opacity: 0;
}

.news-card__category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    z-index: 3;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.news-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-card:hover .news-card__image {
    background-size: 110%;
}

.news-card__content {
    padding: var(--spacing-xl);
}

.news-card--featured .news-card__content {
    padding: var(--spacing-2xl);
}

.news-card__date {
    display: inline-block;
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-sm);
}

.news-card__title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.news-card--featured .news-card__title {
    font-size: var(--font-size-xl);
}

.news-card__excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.news-card__link {
    display: inline-flex;
    align-items: center;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-primary);
}

.news-card__link:hover {
    color: var(--color-primary-dark);
}

/* ==========================================================================
   Contact - 联系方式
   ========================================================================== */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--bg-secondary);
}

.contact__wrapper {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
}

@media (min-width: 1024px) {
    .contact__wrapper {
        grid-template-columns: 1fr 1fr;
    }
}

.contact__info {
    opacity: 0;
    transform: translateX(-30px);
    transition: all 0.8s ease;
}

.contact__info--visible {
    opacity: 1;
    transform: translateX(0);
}

.contact__details {
    margin-top: var(--spacing-xl);
}

.contact__item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact__item svg {
    width: 24px;
    height: 24px;
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}

.contact__label {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-xs);
}

.contact__value {
    display: block;
    font-size: var(--font-size-base);
    color: var(--color-gray-800);
    font-weight: 500;
}

.contact__value:hover {
    color: var(--color-primary);
}

.contact__value--small {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-top: var(--spacing-xs);
}

/* Contact Form */
.contact__form {
    background-color: var(--bg-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateX(30px);
    transition: all 0.8s ease 0.2s;
}

.contact__form--visible {
    opacity: 1;
    transform: translateX(0);
}

.contact__form-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-lg);
}

.form-group {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-base);
    color: var(--color-gray-800);
    background-color: var(--bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    background-color: var(--bg-primary);
}

.form-group label {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    pointer-events: none;
    transition: all var(--transition-fast);
}

.form-group textarea ~ label {
    top: var(--spacing-md);
    transform: translateY(0);
}

.form-group input:focus ~ label,
.form-group input:not(:placeholder-shown) ~ label,
.form-group textarea:focus ~ label,
.form-group textarea:not(:placeholder-shown) ~ label {
    top: 0;
    left: var(--spacing-sm);
    transform: translateY(-50%);
    font-size: var(--font-size-xs);
    color: var(--color-primary);
    background-color: var(--bg-primary);
    padding: 0 var(--spacing-xs);
}

.contact__submit {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-primary);
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.contact__submit:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ==========================================================================
   Footer - 页脚
   ========================================================================== */
.footer {
    background-color: var(--bg-dark);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer__top {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

@media (min-width: 640px) {
    .footer__top {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer__top {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

.footer__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer__logo-icon {
    width: 36px;
    height: 36px;
}

.footer__desc {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
}

.footer__links-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer__links-list li {
    margin-bottom: var(--spacing-sm);
}

.footer__links-list a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

.footer__links-list a:hover {
    color: var(--color-primary-light);
}

.footer__links-list li:not(a) {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
}

.footer__bottom {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
    padding-top: var(--spacing-lg);
    text-align: center;
}

@media (min-width: 768px) {
    .footer__bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

.footer__copyright,
.footer__tech {
    font-size: var(--font-size-xs);
    color: rgba(255, 255, 255, 0.5);
}

/* ==========================================================================
   Back to Top - 返回顶部
   ========================================================================== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: 100;
}

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

.back-to-top:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-4px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ==========================================================================
   Animations - 动画
   ========================================================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-fadeInLeft {
    animation: fadeInLeft 0.6s ease forwards;
}

.animate-fadeInRight {
    animation: fadeInRight 0.6s ease forwards;
}

/* Staggered animation delays */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }

/* ==========================================================================
   Utilities - 工具类
   ========================================================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.hidden { display: none; }

@media (max-width: 767px) {
    .hidden-mobile { display: none; }
}

@media (min-width: 768px) {
    .hidden-desktop { display: none; }
}

/* ==========================================================================
   Enhanced Animations & Visual Improvements
   ========================================================================== */

/* 服务卡片悬浮增强效果 */
.service-card {
    position: relative;
    overflow: hidden;
}

.service-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(96,158,233,0.08) 0%, transparent 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.service-card:hover::after {
    opacity: 1;
}

/* 新闻卡片图片样式优化 */
.news-card__image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
}

.news-card__image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.15) 100%);
    z-index: 1;
    pointer-events: none;
}

.news-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(96,158,233,0.1) 0%, transparent 100%);
    z-index: 2;
    transition: opacity 0.3s ease;
}

.news-card:hover .news-card__overlay {
    opacity: 0;
}

.news-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-card:hover .news-card__image img {
    transform: scale(1.08);
}

/* 合作伙伴卡片渐变效果优化 */
.partner-card {
    background: linear-gradient(145deg, var(--bg-primary) 0%, var(--color-gray-100) 100%);
    border: 1px solid var(--color-gray-200);
}

.partner-card__logo {
    background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    box-shadow: 0 4px 15px rgba(96, 158, 233, 0.3);
}

/* 关于我们区域装饰线 */
.about__wrapper {
    position: relative;
}

.about__wrapper::before {
    content: '';
    position: absolute;
    left: -30px;
    top: 50%;
    transform: translateY(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, transparent 100%);
}

@media (max-width: 1023px) {
    .about__wrapper::before {
        display: none;
    }
}

/* 流程步骤连接线动画 */
@media (min-width: 768px) {
    .process__timeline {
        position: relative;
    }

    .process__timeline::before {
        content: '';
        position: absolute;
        top: 45px;
        left: 10%;
        right: 10%;
        height: 3px;
        background: linear-gradient(90deg,
            var(--color-primary-light) 0%,
            var(--color-primary) 50%,
            var(--color-primary-dark) 100%);
        z-index: 0;
    }
}

/* 按钮悬浮光泽效果 */
.banner__btn {
    position: relative;
    overflow: hidden;
}

.banner__btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s ease;
}

.banner__btn:hover::before {
    left: 100%;
}

/* 统计数字渐变色 */
.stat-card__number {
    background: linear-gradient(135deg, #ffffff 0%, rgba(255,255,255,0.85) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 一带一路区域光线动画 - 已优化，减少性能消耗 */
.belt-road::before {
    opacity: 0.6;
}

/* 页面加载进度条 - 已优化为一次性动画 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    z-index: 9999;
    transform: scaleX(0);
    transform-origin: left;
    animation: loading-bar 1.2s ease forwards;
}

@keyframes loading-bar {
    0% { transform: scaleX(0); }
    30% { transform: scaleX(0.3); }
    60% { transform: scaleX(0.6); }
    100% { transform: scaleX(1); }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* 焦点样式优化 */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 联系方式卡片悬浮效果 */
.contact__item {
    transition: transform 0.3s ease;
}

.contact__item:hover {
    transform: translateX(8px);
}

/* 页脚社交图标动画 */
.footer__social-link {
    position: relative;
    overflow: hidden;
}

.footer__social-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--color-white);
    transition: width 0.3s ease;
}

.footer__social-link:hover::after {
    width: 100%;
}

/* 导航菜单下划线动画 */
.header__menu-link {
    position: relative;
}

.header__menu-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.3s ease;
}

.header__menu-link:hover::after {
    width: 100%;
}

/* 返回顶部按钮 - 简化动画，减少性能消耗 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
    will-change: transform, opacity;
}

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

.back-to-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* 移动端触摸反馈 */
@media (max-width: 1023px) {
    .mobile-nav__menu li a:active {
        background-color: var(--color-gray-200);
    }

    .mobile-nav__menu li a {
        transition: background-color 0.2s ease;
    }
}

/* 大屏幕优化 */
@media (min-width: 1440px) {
    .container {
        max-width: 1320px;
    }

    .banner__title {
        font-size: var(--font-size-5xl);
    }
}

/* 图片懒加载占位效果 */
img[loading="lazy"] {
    background: linear-gradient(135deg, var(--color-gray-200) 0%, var(--color-gray-100) 100%);
}

/* 表单输入增强效果 */
.form-group input:focus,
.form-group textarea:focus {
    box-shadow: 0 0 0 4px rgba(96, 158, 233, 0.15);
    border-color: var(--color-primary);
}

/* 打印样式优化 */
@media print {
    .header,
    .mobile-nav,
    .back-to-top,
    .banner__arrows {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}

/* 辅助功能 - 减少动画 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 辅助功能 - 高对比度模式 */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #004d99;
        --color-accent: #cc6600;
    }
}

/* 合作伙伴卡片内边距和圆角优化 */
.partner-card__logo {
    width: 100%;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    color: var(--color-white);
    font-weight: 700;
    font-size: var(--font-size-sm);
    letter-spacing: 1.5px;
    text-align: center;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 新闻卡片额外样式增强 */
.news-card {
    border: 1px solid var(--color-gray-200);
}

.news-card:hover {
    border-color: var(--color-primary);
}

.news-card__content {
    padding: var(--spacing-lg);
}

.news-card--featured .news-card__content {
    padding: var(--spacing-xl);
}

/* 合作伙伴卡片品牌文字颜色优化 */
.partner-card__logo span,
.partner-card__logo div {
    color: var(--color-white);
    font-weight: 700;
}

/* ================================================================
   关于我们图片展示优化
   ================================================================ */
.about__image {
    position: relative;
    flex: 1;
    min-width: 400px;
    max-width: 600px;
    will-change: transform;
}

.about__image-showcase {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    will-change: opacity;
}

.about__main-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-xl);
    transition: transform 0.5s ease;
}

.about__image-showcase:hover .about__main-image {
    transform: scale(1.03);
}

.about__image-overlay {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.about__stats-badge {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: 12px 20px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 90px;
}

.about__stats-badge--secondary {
    background: linear-gradient(135deg, var(--color-accent) 0%, #e69500 100%);
}

.about__stats-number {
    font-size: var(--font-size-xl);
    font-weight: 700;
    line-height: 1.2;
}

.about__stats-label {
    font-size: var(--font-size-xs);
    opacity: 0.9;
    white-space: nowrap;
}

/* 关于我们区域布局优化 */
@media (max-width: 1023px) {
    .about__image {
        min-width: 100%;
        max-width: 100%;
        margin-top: var(--spacing-xl);
    }

    .about__image-overlay {
        position: relative;
        bottom: auto;
        left: auto;
        right: auto;
        justify-content: center;
        padding: var(--spacing-lg);
        background: linear-gradient(135deg, rgba(13, 97, 159, 0.95) 0%, rgba(96, 158, 233, 0.95) 100%);
        border-radius: 0 0 var(--radius-xl) var(--radius-xl);
        margin-top: -4px;
    }
}

/* ================================================================
   新闻卡片图片优化
   ================================================================ */
.news-card__image {
    height: 220px;
    position: relative;
    background-size: cover;
    background-position: center;
    overflow: hidden;
}

.news-card--featured .news-card__image {
    height: 280px;
}

.news-card__image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
    pointer-events: none;
}

.news-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(13, 97, 159, 0.3) 0%, rgba(96, 158, 233, 0.3) 100%);
    transition: opacity 0.3s ease;
}

.news-card:hover .news-card__overlay {
    opacity: 0.5;
}

.news-card__category {
    position: absolute;
    top: 16px;
    left: 16px;
    background: var(--color-primary);
    color: var(--color-white);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: 500;
    z-index: 2;
    box-shadow: var(--shadow-sm);
}

.news-card:hover .news-card__category {
    background: var(--color-primary-dark);
}