*{margin:0;padding:0;box-sizing:border-box}
.about-banner {
    width:100%;
    height:750px;
    position:relative;
    color:#fff;
    font-family:"Microsoft Yahei",sans-serif;
}
.about-bg {
    position:absolute;
    left:0;
    top:0;
    width:100%;
    height:100%;
    background-position:center center;
    background-size:cover;
    background-repeat:no-repeat;
}
/* 顶部固定导航栏 */
.top-fixed-bar {
    position: absolute;
    left: 0;
    top: 60px;
    width: 100%;
    padding: 0 45px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 9999 !important;
}
.top-fixed-bar a,
.top-fixed-bar div {
    pointer-events: auto;
}

/* 菜单按钮 */
.menu-btn {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 40px;
    height: 28px;
    position: relative;
    cursor: pointer;
}
.menu-btn::before,
.menu-btn::after {
    content: "";
    width: 100%;
    height: 2px;
    background: #D4AF37;
}
.menu-btn::before {
    margin-bottom: 8px;
}
.menu-btn::after {
    margin-top: 8px;
}
.menu-btn span {
    display: block;
    width: 100%;
    height: 2px;
    background: #D4AF37;
}

/* 英文LOGO */
.banner-brand-text {
    z-index: 1;
    text-align: center;
}
.banner-brand-text .brand-en {
    font-family: 'Times New Roman', serif;
    font-style: italic;
    font-size: 72px;
    color: #D4AF37;
    letter-spacing: 2px;
    font-weight: 500;
}
.banner-brand-text .brand-en sup {
    font-size: 24px;
    margin-left: 8px;
    vertical-align: top;
}

/* 右侧语言+搜索 */
.top-right-box {
    display: flex;
    align-items: center;
    gap: 25px;
}
.lang-box {
    display: none;
}
.arrow {
    width: 7px;
    height: 7px;
    border: 1px solid #fff;
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}
.search-btn {
    display: none;
}
.about-title {
    position:absolute;
    top:50%;
    left:120px;
    transform:translateY(-50%);
    z-index:2;
}
.about-title h1 {
    font-size:48px;
    font-weight:normal;
    margin-bottom:10px;
    color: #fff;
}
.about-title p {
    font-size:32px;
    opacity:.9;
}
.about-subnav {
    position:absolute;
    bottom:0;
    left:0;
    right:0;
    display:flex;
    justify-content:center;
    gap:80px;
    padding:30px 0;
    border-top:1px solid rgba(255,255,255,.2);
    z-index:2;
}
/* 默认白色 */
.about-subnav a {
    color: #fff;
    text-decoration: none;
    font-size: 18px;
    letter-spacing: 2px;
    position: relative;
    transition: all 0.3s ease;
}
/* 鼠标悬浮：金色 */
.about-subnav a:hover {
    color: #d4af37;
}
/* 当前栏目 / 默认首页选中：金色 + 下划线 */
.about-subnav a.active {
    color: #d4af37;
}
.about-subnav a.active::after {
    content: '';
    width: 30px;
    height: 2px;
    background: #d4af37;
    position: absolute;
    left: 50%;
    bottom: -8px;
    transform: translateX(-50%);
}

/* 品牌简介板块 */
.about-brand-section {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    margin: 0;
    padding: 0;
    position: relative;
    z-index: 1;
}
.about-brand-wrap {
    height: 100%;
    display: flex;
    flex-direction: column;
}
.about-brand-top {
    width: 100%;
    height: 50%;
    position: relative;
    background-color: #f5f5f5;
}
.about-brand-top-bg {
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transform: scale(1.1);
    transition: opacity 0.5s ease, transform 0.5s ease;
}
.about-brand-top-bg.animate {
    animation: fadeInScale 1.5s ease forwards;
}
.about-brand-bottom {
    width: 100%;
    height: 50%;
    padding: 60px 45px;
    display: flex;
    align-items: flex-start;
    background: #f5f5f5;
    box-sizing: border-box;
    overflow-y: auto;
}
.about-brand-left {
    width: 35%;
    display: flex;
    justify-content: center;
}
.about-brand-title {
    position: relative;
    opacity: 0;
    transform: translateX(-30px);
}
.about-brand-title.animate {
    animation: fadeInLeft 1.5s ease forwards;
}
.about-title-bg {
    position: absolute;
    top: 50%;
    left: 60%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    background-image: url('../1_circle.png');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    z-index: 0;
}
.about-title-en {
    font-size: 120px;
    font-weight: bold;
    color: #111;
    line-height: 1;
    text-align: center;
    white-space: pre-line;
    position: relative;
    z-index: 1;
}
.about-title-text {
    display: inline-block;
    font-size: 16px;
    color: #333;
    letter-spacing: 4px;
    margin-left: 10px;
    vertical-align: middle;
}
.about-brand-right {
    width: 45%;
    padding-left: 60px;
}
.about-brand-text {
    font-size: 20px;
    line-height: 2;
    color: #333;
    margin-bottom: 20px;
    text-align: justify;
}
.about-brand-text.first {
    opacity: 0;
    transform: translateX(-50px);
}
.about-brand-text.first.animate {
    animation: fadeInLeft 1.5s ease forwards;
}
.about-brand-text.second {
    opacity: 0;
    transform: translateX(50px);
}
.about-brand-text.second.animate {
    animation: fadeInRight 1.5s ease forwards;
}
@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 fadeInScale {
    from { opacity: 0; transform: scale(1.1); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

/* 移动端响应式 */
@media (max-width: 768px) {
    .about-brand-section {
        margin-top: 0;
    }
    .about-brand-top {
        height: 50%;
    }
    .about-brand-bottom {
        height: 50%;
        flex-direction: column;
        padding: 30px 20px;
    }
    .about-brand-left {
        width: 100%;
        margin-bottom: 30px;
    }
    .about-title-en {
        font-size: 60px;
    }
    .about-brand-right {
        width: 100%;
        padding-left: 0;
    }
    .about-brand-text {
        font-size: 15px;
        line-height: 1.8;
    }
}

/* 滚动板块样式 */
.scroll-section {
    height: 100vh;
    width: 100%;
    position: relative;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

/* 公司时间线板块 */
.timeline-section {
    width: 100%;
    min-height: 100vh;
    padding: 80px 45px;
    background: #fff;
    display: flex;
    gap: 60px;
    box-sizing: border-box;
    overflow: hidden;
}

/* 左侧时间线区域 */
.timeline-left {
    flex: 1;
    padding-right: 30px;
    overflow: hidden;
}

.timeline-list {
    list-style: none;
    padding: 0;
    margin: 0;
    position: relative;
}

.timeline-list::before {
    content: '';
    position: absolute;
    left: 15px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: #d4af37;
}

.timeline-item {
    position: relative;
    padding-left: 55px;
    padding-bottom: 40px;
    opacity: 0;
    transform: translateX(-30px);
}

.timeline-item.animate {
    animation: fadeInLeft 0.8s ease forwards;
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 8px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #d4af37;
    border: 3px solid #fff;
    box-shadow: 0 0 0 3px rgba(212, 175, 55, 0.3);
}

.timeline-year {
    font-size: 20px;
    font-weight: bold;
    color: #d4af37;
    margin-bottom: 8px;
    display: block;
}

.timeline-title {
    font-size: 18px;
    font-weight: 600;
    color: #111;
    margin-bottom: 10px;
    display: block;
}

/* 右侧图片区域 */
.timeline-right {
    width: 450px;
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    overflow: hidden;
}

.timeline-right .timeline-main-image {
    width: 100%;
    height: 400px;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    border-radius: 8px;
    opacity: 0;
    transform: translateX(30px);
}

.timeline-right .timeline-main-image.animate {
    animation: fadeInRight 0.8s ease forwards;
}

.timeline-right .timeline-small-image {
    width: calc(50% - 7.5px);
    height: 200px;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    border-radius: 8px;
    opacity: 0;
    transform: translateY(20px);
}
.timeline-right .timeline-small-image:nth-child(n+4) {
    width: 100%;
    height: 250px;
}

.timeline-right .timeline-small-image.animate {
    animation: fadeInUp 0.8s ease forwards;
}




/* 底部标语 */
.timeline-slogan {
    text-align: center;
    padding: 30px 0;
    font-size: 18px;
    color: #d4af37;
    font-weight: 500;
    letter-spacing: 4px;
}

/* 时间线响应式 */
@media (max-width: 1200px) {
    .timeline-section {
        flex-direction: column;
        padding: 60px 30px;
    }
    .timeline-right {
        width: 100%;
        max-width: 600px;
        margin: 0 auto;
    }
    .timeline-main-image {
        height: 350px;
    }
}

@media (max-width: 768px) {
    .timeline-section {
        padding: 40px 20px;
        gap: 40px;
    }
    .timeline-left {
        padding-right: 0;
    }
    .timeline-item {
        padding-left: 45px;
        padding-bottom: 30px;
    }
    .timeline-list::before {
        left: 10px;
    }
    .timeline-dot {
        left: 3px;
        width: 12px;
        height: 12px;
    }
    .timeline-year {
        font-size: 16px;
    }
    .timeline-title {
        font-size: 16px;
    }
    .timeline-desc {
        font-size: 14px;
        line-height: 1.6;
    }
    .timeline-main-image {
        height: 280px;
    }
    .timeline-small-image {
        height: 160px;
    }
    .timeline-slogan {
        font-size: 15px;
        letter-spacing: 2px;
    }
}

/* 隐藏滚动条 */
::-webkit-scrollbar {
    width: 0;
    height: 0;
    display: none;
}

* {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

/* 全屏菜单样式 */
.menu-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 9998;
    backdrop-filter: blur(5px);
}
.menu-overlay.active {
    display: block;
    animation: fadeInMenu 0.5s ease;
}
@keyframes fadeInMenu {
    from { opacity: 0; }
    to { opacity: 1; }
}
.fullscreen-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    overflow: hidden;
}
.fullscreen-menu.active {
    display: block;
}
.menu-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    transform: scale(1.05);
    transition: transform 1.5s ease-out;
}
.fullscreen-menu.active .menu-background {
    transform: scale(1);
}
.menu-overlay-inner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.4) 50%, rgba(0, 0, 0, 0.7) 100%);
}
.menu-container {
    position: relative;
    z-index: 2;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 100px 40px 80px;
    box-sizing: border-box;
    overflow: hidden;
}
#fullscreen-menu .banner-brand-text {
    position: absolute;
    top: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
}
#fullscreen-menu .banner-brand-text .brand-en {
    font-family: 'Times New Roman', serif;
    font-style: italic;
    font-size: 72px;
    color: #D4AF37 !important;
    letter-spacing: 2px;
    font-weight: 500;
}
#fullscreen-menu .banner-brand-text .brand-en sup {
    font-size: 24px;
    margin-left: 8px;
    vertical-align: top;
}
.menu-nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 30px;
    max-width: 1200px;
    width: 100%;
    overflow: hidden;
}
.nav-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    opacity: 0;
    transform: translateY(20px);
    animation: slideUpColumn 0.6s ease forwards;
}
.nav-column:nth-child(1) { animation-delay: 0.1s; }
.nav-column:nth-child(2) { animation-delay: 0.15s; }
.nav-column:nth-child(3) { animation-delay: 0.2s; }
.nav-column:nth-child(4) { animation-delay: 0.25s; }
.nav-column:nth-child(5) { animation-delay: 0.3s; }
.nav-column:nth-child(6) { animation-delay: 0.35s; }
@keyframes slideUpColumn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.nav-title {
    font-family: "SimSun", "STSong", "Noto Serif SC", serif;
    font-size: 28px;
    color: #ffffff;
    text-decoration: none;
    letter-spacing: 10px;
    margin-bottom: 30px;
    font-weight: 300;
    transition: all 0.3s ease;
    position: relative;
}
.nav-title::after {
    content: "";
    position: absolute;
    bottom: -8px;
    left: 50%;
    width: 0;
    height: 1px;
    background: rgba(212, 175, 55, 0.8);
    transition: width 0.4s ease;
    transform: translateX(-50%);
}
.nav-title:hover {
    color: #D4AF37;
    letter-spacing: 12px;
}
.nav-title:hover::after {
    width: 50%;
}
.nav-sub-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.nav-sub-item {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    letter-spacing: 3px;
    transition: all 0.3s ease;
    position: relative;
}
.nav-sub-item::after {
    content: "";
    position: absolute;
    bottom: -4px;
    left: 50%;
    width: 0;
    height: 1px;
    background: rgba(255, 255, 255, 0.5);
    transition: width 0.3s ease;
    transform: translateX(-50%);
}
.nav-sub-item:hover {
    color: #ffffff;
}
.nav-sub-item:hover::after {
    width: 80%;
}
.menu-footer {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    opacity: 0;
    animation: fadeInUpMenu 0.8s ease 0.8s forwards;
}
@keyframes fadeInUpMenu {
    from { opacity: 0; transform: translateX(-50%) translateY(20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.footer-text {
    font-family: "SimSun", "STSong", "Noto Serif SC", serif;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 6px;
    margin: 0;
    font-weight: 300;
}
.menu-close {
    position: absolute;
    top: 40px;
    right: 40px;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    z-index: 3;
}
.menu-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}
.menu-close span {
    position: absolute;
    width: 20px;
    height: 1px;
    background: rgba(255, 255, 255, 0.8);
    transition: background 0.3s ease;
}
.menu-close:hover span {
    background: #D4AF37;
}
.menu-close span:first-child {
    transform: rotate(45deg);
}
.menu-close span:last-child {
    transform: rotate(-45deg);
}

/* 全屏菜单响应式 */
@media (max-width: 1200px) {
    .menu-nav-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 30px;
    }
}
@media (max-width: 768px) {
    .menu-container {
        padding: 80px 20px 60px;
    }
    #fullscreen-menu .banner-brand-text .brand-en {
        font-size: 48px;
    }
    .menu-nav-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
    .nav-title {
        font-size: 22px;
        letter-spacing: 8px;
        margin-bottom: 20px;
    }
    .nav-sub-item {
        font-size: 13px;
        letter-spacing: 2px;
    }
    .footer-text {
        font-size: 12px;
        letter-spacing: 4px;
        padding: 0 20px;
    }
    .menu-close {
        width: 36px;
        height: 36px;
        top: 25px;
        right: 25px;
    }
    .menu-close span {
        width: 16px;
    }
}
@media (max-width: 480px) {
    #fullscreen-menu .banner-brand-text .brand-en {
        font-size: 36px;
    }
    .menu-nav-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    .nav-title {
        font-size: 18px;
        letter-spacing: 6px;
    }
    .nav-sub-list {
        gap: 12px;
    }
    .footer-text {
        font-size: 11px;
        letter-spacing: 3px;
    }
}