/* ============================================ */
/* 全局样式与变量定义 */
/* ============================================ */
:root {
    --color-primary-rgb:26, 93, 156; /* 主色调 - 深蓝色 */
    --color-primary: rgb(var(--color-primary-rgb));       /* 主色调 - 深蓝色 */
    --color-primary-light: #4a9eff; /* 主色调高亮 */
    --color-accent: #d62828;        /* 强调色 - 红色 */
    --color-accent-light: #e85d5d;  /* 强调色高亮 */
    --color-bg-dark: #0a2463;       /* 深色背景 */
    --color-bg-dark-light: #15357a; /* 深色背景高亮 */
    --color-bg-gray: #f5f7fa;       /* 灰色背景 */
    --color-text-primary: #333333;  /* 主文字颜色 */
    --color-text-secondary: #666666;/* 次要文字颜色 */
    --color-text-light: #999999;    /* 辅助文字颜色 */
    --color-border: rgba(26, 93, 156, 0.1); /* 边框颜色 */
    --color-white: #ffffff;         /* 白色 */
    --color-white-light: #f9f9fb;   /* 浅白色 */
    --color-gold:#eec231; /* 金色 */
}
html{
    font-size: 16px;
}
/* 全局重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    color: var(--color-text-primary);
    background: var(--color-white);
    line-height: 1.8;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

img {
    max-width: 100%;
    display: block;
    transition: all 0.4s ease;
}

img.lazy {
    opacity: 0;
}


@keyframes lazySpin {
    to { transform: rotate(360deg); }
}

img.lazy-loaded {
    opacity: 1;
}

/* 通用容器 */
.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 通用标题样式 */
.section-title {
    font-size: 38px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 64px;
    text-align: center;
    position: relative;
}

.section-title::before {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2px;
    background: var(--color-accent);
}

.section-title::after {
    content: attr(data-en);
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    font-weight: 300;
    color: rgba(var(--color-primary-rgb), 0.2);
    letter-spacing: 8px;
    text-transform: uppercase;
    margin-top: 14px;
}


/* ============================================ */
/* 顶部信息栏 */
/* ============================================ */
.top-bar {
    display: none;
    background: var(--color-bg-gray);
    /* color: rgba(255, 255, 255, 0.85); */
    font-size: 13px;
    border-bottom: 1px solid #e8e8e8
}
.top-bar-inner {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 36px;
}
.top-bar-left {
    display: flex;
    align-items: center;
    gap: 6px;
}
.top-bar-item {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: var(--color-text-secondary);
    transition: color 0.25s ease;
}

.top-bar-icon {
    display: inline-block;
    width: 14px;
    height: 14px;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.7;
    flex-shrink: 0;
}
.top-bar-sep {
    color: var(--color-text-secondary);
    margin: 0 6px;
}
.top-bar-right {
    display: flex;
    align-items: center;
}

/* 语言切换按钮 - 深色顶部栏版本 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0;
    flex-shrink: 0;
    background: var(--color-border);
    border-radius: 14px;
    padding: 2px 4px;
}
.lang-option {
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    padding: 3px 11px;
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
    color: var(--color-bg-gray);
    letter-spacing: 0.3px;
    user-select: none;
    line-height: 1.4;
}
.lang-option.active {
    background: var(--color-white-light);
    color: var(--color-primary);
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}
.lang-option:not(.active):hover {
    color: var(--color-accent);
}

/* ============================================ */
/* 头部导航样式 */
/* ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    transition: all 0.3s ease;
    box-shadow: 0 2px 25px rgba(26, 93, 156, 0.08);
    background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(255,255,255,0.92) 100%);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
}

.nav {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px 20px;
    transition: padding 0.4s cubic-bezier(0.22, 1, 0.36, 1);
}

.header.fixed .top-bar {
    display: none;
}
.header.fixed .nav {
    padding: 5px 20px;
}

.logo {
    height: 65px;
}

.logo img {
    height: 100%;
    width: auto;
    object-fit: contain;
}

.menu {
    display: flex;
    gap: 36px;
}

.menu a {
    font-size: 16px;
    position: relative;
    color: var(--color-text-primary);
    font-weight: 500;
    padding: 10px 0;
}

.menu-item {
    position: relative;
}

.menu-item > a {
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.menu-item.has-submenu > a::before {
    content: '▼';
    font-size: 10px;
    color: var(--color-text-light);
    transition: transform 0.3s ease;
    position: absolute;
    right: -8px;
}

.menu-item.has-submenu:hover > a::before {
    transform: rotate(180deg);
    color: var(--color-primary); 
}

.menu-item:hover > a {
    color: var(--color-primary);
}

/* 子菜单样式 */
.submenu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 240px;
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-white-light) 100%);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(26, 93, 156, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.35s cubic-bezier(0.22,1,0.36,1);
    z-index: 1000;
    padding: 8px 0;
}

.menu-item:hover .submenu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.submenu a {
    display: block;
    padding: 12px 20px;
    font-size: 15px;
    color: var(--color-text-secondary);
    white-space: nowrap;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.submenu a:hover {
    color: var(--color-primary);
    background: rgba(26, 93, 156, 0.05);
    border-left-color: var(--color-accent);
}

.submenu a>span {
    display: inline-block;
    transition: transform 0.35s cubic-bezier(0.22,1,0.36,1);
}

.submenu a:hover>span {
    transform: translateX(4px);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 1001;
}

.hamburger {
    width: 26px;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
    transform-origin: center;
}

/* 汉堡菜单动画 */
.mobile-menu-toggle.active .hamburger:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.mobile-menu-toggle.active .hamburger:nth-child(2) {
    opacity: 0;
    transform: translateX(-10px);
}

.mobile-menu-toggle.active .hamburger:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}


@media (max-width: 768px) {

    .mobile-menu-toggle {
        display: flex;
    }
    
    .menu {
        display: none;
        position: fixed;
        top: 75px;
        /* top:128px; */
        left: 0;
        right: 0;
        background: var(--color-white);
        box-shadow: 0 8px 32px rgba(26, 93, 156, 0.12);
        z-index: 1000;
        flex-direction: column;
        gap: 0;
        padding: 20px 0;
        max-height: calc(100vh - 80px);
        overflow-y: auto;
    }
    
    .menu.active {
        display: flex;
    }
    
    .menu > a,
    .menu .menu-item > a {
        padding: 16px 24px;
        font-size: 16px;
        border-bottom: 1px solid rgba(26, 93, 156, 0.06);
        justify-content: space-between;
    }
    
    .menu-item.has-submenu > a::before {
        right: 24px;
    }
    
    .menu-item .submenu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        box-shadow: none;
        border: none;
        border-radius: 0;
        padding: 0;
        background: rgba(26, 93, 156, 0.03);
        display: none;
    }
    
    .menu-item.active .submenu {
        display: block;
    }
    
    .menu-item.has-submenu.active > a::before {
        transform: rotate(180deg);
    }
    
    .submenu a {
        padding: 14px 24px 14px 48px;
        border-left: none;
        font-size: 14px;
    }
    
    .submenu a:hover {
        border-left: none;
        background: rgba(26, 93, 156, 0.08);
    }
}

/* ============================================ */
/* 页脚区域样式 */
/* ============================================ */
.footer {
    background: var(--color-bg-dark);
    color: var(--color-white);
    padding: 70px 0 0;
}
.footer .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
    gap: 50px;
}
.footer-about h2 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 18px;
    color: var(--color-white);
    position: relative;
    padding-bottom: 14px;
    letter-spacing: 1px;
}
.footer-about h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--color-primary-light);
    border-radius: 1px;
}
.footer-about p {
    font-size: 14px;
    color: #a8b2c4;
    line-height: 1.9;
    margin: 0;
}
.footer h3 {
    font-size: 15px;
    margin-bottom: 22px;
    font-weight: 600;
    color: var(--color-white);
    letter-spacing: 0.5px;
    position: relative;
    padding-bottom: 10px;
}
.footer h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: rgba(var(--color-primary-rgb), 0.4);
    border-radius: 1px;
}
.footer ul {
    list-style: none;
    padding: 0;
    margin: 0;
}
.footer li {
    font-size: 14px;
    color: #a8b2c4;
    line-height: 2.4;
}
.footer li a {
    color: #a8b2c4;
    text-decoration: none;
    transition: color 0.25s, padding-left 0.25s;
    display: inline-block;
}
.footer li a:hover {
    color: var(--color-primary-light);
    padding-left: 4px;
}
/* 联系信息样式 */
.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    line-height: 1.7;
    margin-bottom: 12px;
}
.footer-contact li svg {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
    margin-top: 1px;
    color: var(--color-primary-light);
}
/* 底部栏 */
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    margin-top: 60px;
    padding: 22px 0;
}
.footer-bottom .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-bottom .copyright {
    font-size: 13px;
    color: #8892a4;
}
.footer-links {
    display: flex;
    gap: 20px;
    font-size: 13px;
    flex-wrap: wrap;
}
.footer-links a {
    color: #7a8ba8;
    text-decoration: none;
    transition: color 0.25s;
}
.footer-links a:hover {
    color: var(--color-primary-light);
    text-decoration: underline;
}
/* 响应式 */
@media (max-width: 1024px) {
    .footer .container {
        grid-template-columns: 1fr 1fr;
        gap: 40px 30px;
    }
    .footer-about { grid-column: 1 / -1; }
    .footer-bottom .container { flex-direction: column; text-align: center; }
    .footer-links { justify-content: center; }
}
@media (max-width: 640px) {
    .footer .container {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .footer-about { grid-column: auto; }
    .footer { padding: 50px 0 0; }
    .footer-bottom { margin-top: 40px; }
}

/* ========== 回到顶部按钮 ========== */
.back-to-top {
    position: fixed;
    right: 36px;
    bottom: 48px;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(var(--color-primary-rgb), 0.75);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(var(--color-primary-rgb), 0.4);
    color: var(--color-white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 24px rgba(var(--color-primary-rgb), 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    z-index: 9999;
    overflow: hidden;
}
.back-to-top::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(var(--color-primary-rgb), 0.15) 0%, transparent 50%);
    pointer-events: none;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}
.back-to-top:hover {
    transform: translateY(-3px) scale(1);
    background: var(--color-primary);
    border-color: var(--color-primary-light);
    box-shadow: 0 8px 32px rgba(var(--color-primary-rgb), 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}
.back-to-top:hover .ring-progress {
    stroke: var(--color-primary-light);
}
.back-to-top:active {
    transform: translateY(-1px) scale(0.97);
}
.back-to-top svg {
    width: 20px;
    height: 20px;
    position: relative;
    z-index: 1;
}
/* 进度环 */
.back-to-top .progress-ring {
    position: absolute;
    inset: -2px;
    width: calc(100% + 4px);
    height: calc(100% + 4px);
    transform: rotate(-90deg);
}
.back-to-top .progress-ring circle {
    fill: none;
    stroke-width: 2;
}
.back-to-top .progress-ring .ring-bg {
    stroke: rgba(var(--color-primary-rgb), 0.15);
}
.back-to-top .progress-ring .ring-progress {
    stroke: var(--color-white);
    opacity: 0.3;
    stroke-linecap: round;
    transition: stroke-dashoffset 0.15s ease, stroke 0.3s ease;
}

/* ========== 页面滚动进度条 ========== */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
    z-index: 10001;
    transition: width 0.1s linear;
    pointer-events: none;
}
.scroll-progress::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 80px;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(var(--color-primary-rgb), 0.4));
    filter: blur(2px);
}

/* ========== 波浪分隔线 ========== */
.wave-divider {
    position: relative;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    margin-top: -1px;
    height: 120px;
    background: var(--color-white-light);
}
.wave-svg {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 200%;
    height: 100%;
}
.wave-divider.animated .wave-back {
    animation: waveScroll 18s linear infinite;
}
.wave-divider.animated .wave-mid {
    animation: waveScroll 12s linear infinite reverse;
}
.wave-divider.animated .wave-front {
    animation: waveScroll 8s linear infinite;
}
@keyframes waveScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}
@media (max-width: 768px) {
    .wave-divider { height: 70px; }
}

/* ========== Scroll Reveal 动画 ========== */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}
[data-reveal="left"] {
    transform: translateX(-40px);
}
[data-reveal="right"] {
    transform: translateX(40px);
}
[data-reveal="zoom"] {
    transform: scale(0.9);
}
[data-reveal].revealed {
    opacity: 1;
    /* transform: translateY(0) translateX(0) scale(1); */
    transform: none;
}
/* 依次延迟 */
[data-reveal][data-delay="1"] { transition-delay: 0.1s; }
[data-reveal][data-delay="2"] { transition-delay: 0.2s; }
[data-reveal][data-delay="3"] { transition-delay: 0.3s; }
[data-reveal][data-delay="4"] { transition-delay: 0.4s; }
[data-reveal][data-delay="5"] { transition-delay: 0.5s; }
/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    [data-reveal] {
        opacity: 1;
        transform: none;
        transition: none;
    }
}
/* 移动端 - 顶部栏适配 */
@media (max-width: 768px) {
    .top-bar-inner {
        padding: 0 12px;
        height: 32px;
    }
    .top-bar-item {
        font-size: 11px;
        gap: 3px;
    }
    .top-bar-icon {
        width: 12px;
        height: 12px;
    }
    .lang-switch {
        padding: 1px 3px;
        border-radius: 12px;
    }
    .lang-option {
        font-size: 11px;
        padding: 2px 9px;
        border-radius: 11px;
    }
    .top-bar-sep {
        margin: 0 2px;
    }
}
@media (max-width: 480px) {
    .top-bar-left .top-bar-item + .top-bar-sep,
    .top-bar-left .top-bar-sep + .top-bar-item {
        display: none;
    }
    .top-bar-left .top-bar-item:nth-child(n+2) {
        display: none;
    }
}