:root {
    --primary-text-color: #25272E;
    --primary-green: #46A84C;

    --text-gray: #666666;
    --bg-white: #ffffff;
    --transition-speed: 0.3s;

    --primary-fontSize48: 48px;
    --primary-fontSize28: 28px;
    --primary-fontSize26: 26px;
    --primary-fontSize22: 22px;
    --primary-fontSize18: 18px;
    --primary-fontSize16: 16px;
    --primary-fontSize14: 14px;

    --primary-pHeight88: 88px;
    --primary-pHeight50: 50px;

    --primary-font-weight600: 600;
    --primary-font-weight400: 400;

    --primary-line-height0999: 0.999;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: PingFangSC, PingFang SC, Microsoft YaHei, sans-serif;
    font-size: var(--primary-fontSize14);
    line-height: 1.6;
    color: #333;
    background-color: var(--bg-white);
}

a {
    text-decoration: none;
    color: inherit;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}
::-webkit-scrollbar {
    width: 13px;
    height: 10px;
}
::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.4);
    background-clip: padding-box;
    border: 3px solid transparent;
    border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.5);
}

::-webkit-scrollbar-track {
    background-color: transparent;
}

::-webkit-scrollbar-track:hover {
    background-color: #f8fafc;
}
/* 页面内容模块显隐控制 */
.page-module {
    display: none;
}

.page-module.active {
    display: block;
}

/* 子导航样式调整 - 改为span元素 */
.sub-nav-item {
    display: block;
    user-select: none;
}

/* 页面切换动画 */
.page-module {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.page-module.active {
    opacity: 1;
}

/* 导航栏吸附样式 */
.sub-nav.sticky {
    background-color: #EEEFF2;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.container {
    max-width: 1240px;
    margin: 0 auto;
}
.esg-base-container {
    min-width: 1240px;
    overflow-x: auto;
    margin: 0 auto;
}
/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg-white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
    border-bottom: 1px solid #eee;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
}

.nav-main {
    display: flex;
    gap: 40px;
}

.nav-main a {
    font-size: var(--primary-fontSize14);
    color: #333;
    transition: color 0.3s;
}

.nav-main a:hover {
    color: var(--primary-green);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.lang-switch {
    font-size: var(--primary-fontSize14);
    color: #666;
}

.menu-toggle {
    width: 24px;
    height: 18px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    height: 2px;
    background: #333;
}

/* Banner Styles */
.banner {
    width: 100%;
    height: 400px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    margin-top: 70px;
    overflow: hidden;
}

.banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.2);
}

/* Sub Nav Styles */
.sub-nav {
    margin: 0 auto;
    position: sticky;
    top: 84px;
    z-index: 10;
}

.sub-nav-list {
    display: flex;
    justify-content: center;
    max-width: 1240px;
    margin: 0 auto;
    background: #EEEFF2;
}

.sub-nav-item {
    flex: 1;
    text-align: center;
    padding: 10px;
    font-size: var(--primary-fontSize14);
    color: var(--primary-text-color);
    cursor: pointer;
    transition: all 0.3s;
    border-bottom: 6px solid transparent;
    position: relative;
    background: #EEEFF2;
}

.sub-nav-item.active, .sub-nav-item:hover {
    color: var(--primary-green);
    background: #EAFCEA;
    border-bottom-color: var(--primary-green);
    font-weight: var(--primary-font-weight600);
}

/* Section Styles */
.section {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}
.section-first {
    padding-top: var(--primary-pHeight50);
}
.section + .section {
    margin-top: var(--primary-pHeight50);
}
.section-center {
    max-width: 1240px;
    margin: 0 auto;
}
.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-title {
    font-weight: var(--primary-font-weight600);
    font-size: var(--primary-fontSize28);
    color: var(--primary-text-color);
    line-height: var(--primary-line-height0999);
    margin-bottom: 20px;
}
.section-title-special {
    font-weight: var(--primary-font-weight600);
    font-size: var(--primary-fontSize48);
    color: var(--primary-green);
    line-height: var(--primary-line-height0999);
    margin-bottom: 20px;
}
.section-desc {
    font-weight: 400;
    font-size: var(--primary-fontSize16);
    color: var(--primary-text-color);
    margin-bottom: var(--primary-pHeight50);
}
.section-desc-special {
    margin-bottom: 30px;
}

/* Green Title Bar */
.green-bar {
    display: inline-block;
    background: var(--primary-green);
    color: var(--bg-white);
    padding: 9px 15px;
    font-size: var(--primary-fontSize14);
    margin-bottom: 30px;
}

/* Footer Styles */
.footer {
    background: #333;
    color: var(--bg-white);
    padding: 40px 0;
    text-align: center;
}

.footer-content {
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 20px;
}
.goal-highlight {
    color: var(--primary-green);
    font-weight: var(--primary-font-weight600);
    font-size: 24px;
}