/* 全局重置+核心配色（藏青+暖金+米白）+ SEO基础优化 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Montserrat", "PingFang SC", sans-serif;
    scroll-behavior: smooth;
}

:root {
    --primary: #0A2463;    /* 主色-藏青（轻奢、专业） */
    --accent: #FFD700;     /* 强调色-暖金（轻奢、活力） */
    --light: #F5F5F0;      /* 米白背景（柔和、轻奢） */
    --gray: #5C5C5C;       /* 中性灰文本 */
    --dark-gray: #2D2D2D;  /* 深灰文本 */
    --shadow: 0 6px 20px rgba(10, 36, 99, 0.08); /* 藏青调轻奢阴影 */
    --hover-shadow: 0 12px 30px rgba(10, 36, 99, 0.15); /* 悬浮增强阴影 */
    --gradient: linear-gradient(120deg, #0A2463, #103888); /* 藏青渐变 */
    --gold-gradient: linear-gradient(120deg, #FFD700, #F0C800); /* 暖金渐变 */
}

body {
    background-color: var(--light);
    color: var(--dark-gray);
    line-height: 1.8;
    overflow-x: hidden;
}

/* 通用容器（轻奢窄边距+居中）+ SEO语义化 */
.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.4s ease;
}

ul {
    list-style: none;
}

/* 导航架构差异化：滚动吸顶全屏导航（区别于侧边/折叠导航） */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: transparent;
    z-index: 9999;
    transition: all 0.5s ease;
    padding: 20px 0;
}

.header.scrolled {
    background-color: var(--primary);
    padding: 15px 0;
    box-shadow: var(--shadow);
}

.nav-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 32px;
    font-weight: 800;
    color: var(--accent);
    letter-spacing: 1px;
}

.logo span {
    color: var(--light);
}

/* PC端导航菜单（轻奢横向布局） */
.nav-menu {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-menu li a {
    color: var(--light);
    font-size: 16px;
    font-weight: 500;
    position: relative;
}

.nav-menu li a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent);
    transition: width 0.4s ease;
}

.nav-menu li a:hover::after, .nav-menu li a.active::after {
    width: 100%;
}

/* 移动端导航（差异化：全屏侧滑） */
.mobile-nav-btn {
    display: none;
    color: var(--light);
    font-size: 28px;
    cursor: pointer;
}

.mobile-nav-menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background-color: var(--primary);
    display: flex;
    flex-direction: column;
    padding: 40px 20px;
    transition: right 0.5s ease;
    z-index: 9999;
}

.mobile-nav-menu.active {
    right: 0;
}

.mobile-nav-menu li {
    margin-bottom: 30px;
}

.mobile-nav-menu li a {
    color: var(--light);
    font-size: 18px;
}

.mobile-close-btn {
    align-self: flex-end;
    color: var(--accent);
    font-size: 24px;
    cursor: pointer;
    margin-bottom: 40px;
}

/* Banner区域（差异化：全屏视觉差+轻奢渐变叠加） */
.banner {
    height: 100vh;
    background: url("https://tse-mm.bing.com/th?q=B体育 亚洲轻奢运动装备 全屏场景") center/cover no-repeat;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.banner::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(10, 36, 99, 0.7), rgba(10, 36, 99, 0.9));
}

.banner-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: 0 20px;
}

.banner-content h1 {
    font-size: 56px;
    color: var(--light);
    margin-bottom: 20px;
    line-height: 1.2;
}

.banner-content h1 span {
    color: var(--accent);
}

.banner-content p {
    font-size: 20px;
    color: var(--light);
    opacity: 0.9;
    margin-bottom: 40px;
}

.banner-btn {
    display: inline-block;
    padding: 15px 40px;
    background: var(--gold-gradient);
    color: var(--primary);
    border-radius: 50px;
    font-weight: 700;
    font-size: 18px;
    transition: all 0.4s ease;
    box-shadow: var(--shadow);
}

.banner-btn:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

/* 核心模块（差异化：视觉差区块+轻奢卡片） */
.section {
    padding: 100px 0;
    position: relative;
}

.section:nth-child(even) {
    background-color: #FFFFFF;
}

.section-title {
    font-size: 38px;
    color: var(--primary);
    margin-bottom: 60px;
    text-align: center;
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background-color: var(--accent);
}

/* 亚洲本土化优势（差异化：网格卡片+暖金边框） */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
    margin-top: 20px;
}

.advantage-card {
    background-color: var(--light);
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--accent);
    transition: all 0.5s ease;
}

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

.advantage-card h3 {
    color: var(--primary);
    font-size: 24px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.advantage-card h3 i {
    color: var(--accent);
    font-size: 28px;
}

.advantage-card p {
    color: var(--gray);
    font-size: 16px;
    line-height: 1.8;
}

/* 产品中心（差异化：沉浸式场景卡片+亚洲分区分类） */
.product-tab {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
}

.product-tab-btn {
    padding: 10px 30px;
    background-color: var(--light);
    border: none;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    transition: all 0.4s ease;
}

.product-tab-btn.active {
    background-color: var(--primary);
    color: var(--accent);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.product-card {
    background-color: #FFFFFF;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all 0.5s ease;
}

.product-card:hover {
    box-shadow: var(--hover-shadow);
}

.product-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: all 0.5s ease;
}

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

.product-card .product-info {
    padding: 25px;
}

.product-card .product-info h3 {
    color: var(--primary);
    font-size: 20px;
    margin-bottom: 15px;
}

.product-card .product-info p {
    color: var(--gray);
    font-size: 15px;
    line-height: 1.8;
}

/* 新闻资讯（差异化：轻奢列表+暖金时间戳） */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.news-item {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 30px;
    background-color: #FFFFFF;
    padding: 30px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: all 0.4s ease;
}

.news-item:hover {
    box-shadow: var(--hover-shadow);
}

.news-item-img {
    width: 100%;
    height: 200px;
    border-radius: 8px;
    overflow: hidden;
}

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

.news-item-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.news-item-content .news-date {
    color: var(--accent);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
}

.news-item-content .news-title {
    color: var(--primary);
    font-size: 22px;
    margin-bottom: 15px;
}

.news-item-content .news-desc {
    color: var(--gray);
    font-size: 16px;
    line-height: 1.8;
}

/* 案例展示（差异化：全屏案例+轻奢叠加文案） */
.case-slider {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.case-item {
    height: 500px;
    border-radius: 16px;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow);
}

.case-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.6s ease;
}

.case-item:hover img {
    transform: scale(1.1);
}

.case-item .case-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 50px;
    background: linear-gradient(to top, var(--primary), transparent);
    color: var(--light);
}

.case-item .case-info h3 {
    font-size: 28px;
    margin-bottom: 15px;
    color: var(--accent);
}

.case-item .case-info p {
    font-size: 16px;
    line-height: 1.8;
    opacity: 0.9;
    max-width: 800px;
}

/* 联系我们（差异化：亚洲分区联系方式+轻奢表单） */
.contact-wrap {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 50px;
}

.contact-info {
    background: var(--gradient);
    color: var(--light);
    padding: 50px;
    border-radius: 16px;
}

.contact-info h3 {
    font-size: 28px;
    margin-bottom: 40px;
    color: var(--accent);
}

.contact-region {
    margin-bottom: 30px;
}

.contact-region h4 {
    font-size: 20px;
    margin-bottom: 15px;
    border-bottom: 1px solid rgba(255, 215, 0, 0.3);
    padding-bottom: 10px;
}

.contact-region p {
    font-size: 16px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.contact-form input, .contact-form textarea, .contact-form select {
    padding: 18px;
    border: 1px solid #E0E0E0;
    border-radius: 12px;
    font-size: 16px;
    color: var(--dark-gray);
    background-color: var(--light);
    transition: all 0.4s ease;
}

.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(255, 215, 0, 0.1);
}

.contact-form button {
    padding: 18px;
    background: var(--gold-gradient);
    color: var(--primary);
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.4s ease;
}

.contact-form button:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
}

/* 底部（差异化：藏青底+暖金文字+亚洲版图元素） */
.footer {
    background-color: var(--primary);
    color: var(--light);
    padding: 80px 0 30px;
}

.footer-top {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-logo {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 20px;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 16px;
    line-height: 1.8;
}

.footer-links h4 {
    font-size: 20px;
    margin-bottom: 20px;
    color: var(--accent);
}

.footer-links ul li {
    margin-bottom: 15px;
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.7);
    transition: all 0.3s ease;
}

.footer-links ul li a:hover {
    color: var(--accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
}

/* 响应式适配（差异化：移动端视觉重构） */
@media (max-width: 1200px) {
    .news-item {
        grid-template-columns: 1fr;
    }
    .news-item-img {
        height: 250px;
    }
    .contact-wrap {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 992px) {
    .nav-menu {
        display: none;
    }
    .mobile-nav-btn {
        display: block;
    }
    .banner-content h1 {
        font-size: 42px;
    }
    .section-title {
        font-size: 32px;
    }
    .case-item {
        height: 400px;
    }
    .case-item .case-info {
        padding: 30px;
    }
}

@media (max-width: 576px) {
    .banner-content h1 {
        font-size: 32px;
    }
    .banner-content p {
        font-size: 16px;
    }
    .section {
        padding: 70px 0;
    }
    .advantage-grid {
        grid-template-columns: 1fr;
    }
    .product-grid {
        grid-template-columns: 1fr;
    }
    .case-item {
        height: 300px;
    }
    .contact-info {
        padding: 30px;
    }
}