/* ========== 基础重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== 颜色变量 ========== */
:root {
    --primary-color: #1a472a;   /* 墨绿色 */
    --secondary-color: #c62828; /* 红色 */
    --light-color: #f1f8e9;
    --dark-color: #0d2818;
    --gray-color: #6c757d;
    --white-color: #ffffff;
}

/* ========== 顶部导航（Logo 跨双行 + 导航靠右） ========== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--white-color);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
    position: relative;
    min-height: 130px;
}

/* --- Logo：跨越两行导航的高度，透明底色 --- */
.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    padding: 10px 0;
    text-decoration: none;
}

.logo img {
    height: 100px;
    width: auto;
    background-color: transparent;
    padding: 0;
    transition: height 0.3s ease;
}

/* --- 导航容器：靠右，纵向排列上下两行 --- */
.nav-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 16px;
    padding: 20px 0;
}

/* ============================================================
   上层：刀片形直角梯形标签
   ============================================================ */
.top-nav {
    display: flex;
    gap: 0;
}

.top-nav-item {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 180px;
    height: 50px;
    font-size: 1.05rem;
    font-weight: 500;
    letter-spacing: 1px;
    color: var(--gray-color);
    text-decoration: none;
    white-space: nowrap;
    background-color: #e8ebe8;
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
}

/* 快销产品（左）：平行四边形 */
.top-nav-item:first-child {
    clip-path: polygon(30px 0, 100% 0, calc(100% - 30px) 100%, 0 100%);
    padding-left: 8px;
}

/* 跨境服务（右）：直角梯形，与左侧标签无缝拼接 */
.top-nav-item:last-child {
    clip-path: polygon(30px 0, 100% 0, 100% 100%, 0 100%);
    margin-left: -30px;
    padding-left: 38px;
}

.top-nav-item:hover {
    color: var(--primary-color);
    background-color: #d5ddd3;
}

.top-nav-item.active {
    color: #fff;
    background-color: var(--primary-color);
}

/* --- 下层：页内锚点导航 --- */
.sub-nav {
    display: flex;
    justify-content: flex-end;
}

.nav-list {
    display: flex;
    gap: 28px;
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-list a {
    display: inline-block;
    color: var(--dark-color);
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    padding: 5px 2px;
    position: relative;
    transition: color 0.3s;
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

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

.nav-list a:hover::after {
    width: 100%;
}

/* --- 移动端汉堡按钮 --- */
.mobile-menu-btn {
    display: none;
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-size: 20px;
    width: 44px;
    height: 44px;
    border-radius: 8px;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
    flex-shrink: 0;
}

.mobile-menu-btn:hover {
    background-color: var(--primary-color);
    color: #fff;
}

/* ========== 按钮 ========== */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn:hover {
    background-color: var(--dark-color);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid #fff;
    color: #fff;
}

.btn-outline:hover {
    background-color: #fff;
    color: var(--primary-color);
}

/* ========== 首屏标语 ========== */
.hero-section {
    background: linear-gradient(rgba(26, 71, 42, 0.85), rgba(13, 40, 24, 0.9));
    background-size: cover;
    background-position: center;
    color: #fff;
    padding: 100px 0;
    text-align: center;
    margin-bottom: 60px;
}

.hero-title {
    font-size: 2.8rem;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== 通用板块 ========== */
.section-title {
    text-align: center;
    font-size: 2.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
    font-weight: 700;
}

.section-subtitle {
    text-align: center;
    color: var(--gray-color);
    margin-bottom: 50px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.page-section {
    padding: 80px 0;
}

.page-section.alt-bg {
    background-color: var(--light-color);
}

/* ========== 产品展示（快销产品页） ========== */
.products-section {
    padding-bottom: 80px;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.product-card {
    background-color: var(--white-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.product-card:hover {
    transform: translateY(-10px);
}

/* 图片区域：正方形（高度 = 宽度） */
.product-img {
    position: relative;
    width: 100%;
    aspect-ratio: 1 / 1; /* 高度等于宽度 */
    overflow: hidden;
    background-color: #f4f6f4;
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.product-label {
    position: absolute;
    top: 20px;
    right: 0;
    background-color: var(--secondary-color);
    color: #fff;
    padding: 8px 15px;
    font-weight: 500;
    border-radius: 4px 0 0 4px;
}

.product-content {
    padding: 25px;
}

.product-title {
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.product-spec {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid #eee;
}

.spec-label {
    font-weight: 600;
    color: var(--dark-color);
}

.spec-value {
    color: var(--gray-color);
    margin-left: 5px;
}

.product-features h4,
.product-process h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.product-features ul {
    list-style: none;
    margin-bottom: 20px;
}

.product-features li {
    padding: 5px 0;
    color: var(--gray-color);
    position: relative;
    padding-left: 20px;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.product-process p {
    color: var(--gray-color);
    margin-bottom: 20px;
}

.product-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.tag {
    background-color: var(--light-color);
    color: var(--primary-color);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 14px;
}

/* ========== 公司介绍 ========== */
.about-section {
    background-color: var(--light-color);
    padding: 80px 0;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 50px;
    align-items: center;
}

.about-text p {
    margin-bottom: 20px;
    color: var(--dark-color);
    font-size: 1.05rem;
    line-height: 1.8;
}

.about-image {
    display: flex;
    justify-content: center;
}

.about-logo {
    text-align: center;
}

/* Logo 长方形容器（透明底色） */
.logo-rectangle {
    width: 200px;
    height: 80px;
    margin: 0 auto 15px;
    background-color: transparent;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-rectangle img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background-color: transparent;
}

.logo-description {
    color: var(--primary-color);
    font-size: 1.2rem;
    font-weight: 500;
}

/* ========== 烹调指导 ========== */
.cooking-section {
    padding: 80px 0;
}

.cooking-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.cooking-card {
    background-color: var(--white-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.cooking-icon {
    width: 70px;
    height: 70px;
    background-color: var(--light-color);
    color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 30px;
}

.cooking-card h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.4rem;
}

.cooking-steps,
.cooking-tips {
    text-align: left;
    list-style-position: inside;
    color: var(--gray-color);
}

.cooking-steps li,
.cooking-tips li {
    margin-bottom: 10px;
    padding-left: 10px;
}

/* ========== 联系方式 ========== */
.contact-section {
    padding: 80px 0;
    background-color: var(--light-color);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

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

.contact-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.contact-details h4 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.contact-details p {
    color: var(--gray-color);
}

.contact-form {
    background-color: var(--white-color);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
}

.contact-form h3 {
    color: var(--primary-color);
    margin-bottom: 25px;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: inherit;
    font-size: 16px;
    resize: vertical;
}

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

/* ========== 页脚 ========== */
.footer {
    background-color: var(--dark-color);
    color: #fff;
    padding: 60px 0 30px;
}

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

.footer-logo {
    text-align: center;
}

.footer-logo .logo-rectangle {
    width: 200px;
    height: 80px;
    margin-bottom: 15px;
    background-color: transparent;
    padding: 0;
}

.footer-logo .logo-rectangle img {
    background-color: transparent;
}

.footer-logo .logo-description {
    color: #fff;
    opacity: 0.8;
}

.footer-links h4,
.footer-social h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #fff;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: #fff;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: #fff;
    border-radius: 50%;
    font-size: 18px;
    transition: all 0.3s;
    text-decoration: none;
}

.social-icons a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

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

.footer-bottom p {
    margin-bottom: 10px;
}

/* ========== 跨境服务页 - 供应链链路 ========== */
.flow-grid {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 40px;
}

.flow-item {
    flex: 1 1 240px;
    max-width: 300px;
    background: var(--white-color);
    border-radius: 10px;
    padding: 30px 22px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.06);
    text-align: center;
    border-top: 4px solid #dce8d6;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.flow-item:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
}

.flow-item-center {
    border-top-color: var(--primary-color);
    background: linear-gradient(180deg, #f1f8e9 0%, #ffffff 65%);
}

.flow-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background-color: var(--light-color);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    margin: 0 auto 18px;
}

.flow-item-center .flow-icon {
    background-color: var(--primary-color);
    color: #fff;
}

.flow-item h3 {
    color: var(--primary-color);
    font-size: 1.15rem;
    margin-bottom: 12px;
}

.flow-item p {
    color: var(--gray-color);
    font-size: 0.95rem;
    line-height: 1.7;
}

.flow-arrow {
    display: flex;
    align-items: center;
    color: var(--primary-color);
    font-size: 26px;
    opacity: 0.6;
}

/* ========== 跨境服务页 - 上游货源 ========== */
.range-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.range-card {
    background: var(--white-color);
    border-radius: 10px;
    padding: 35px 25px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.06);
    transition: transform 0.3s ease;
}

.range-card:hover {
    transform: translateY(-6px);
}

.range-card .range-icon {
    font-size: 40px;
    color: var(--secondary-color);
    margin-bottom: 18px;
}

.range-card h3 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.range-card p {
    color: var(--gray-color);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========== 跨境服务页 - 核心优势 ========== */
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.advantage-card {
    background: var(--white-color);
    border-radius: 10px;
    padding: 30px 25px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.06);
    border-left: 4px solid var(--primary-color);
}

.advantage-card h3 {
    color: var(--primary-color);
    font-size: 1.15rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.advantage-card h3 i {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.advantage-card p {
    color: var(--gray-color);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========== 跨境服务页 - 中国肉品优势 ========== */
.reason-section {
    background: linear-gradient(rgba(26, 71, 42, 0.94), rgba(13, 40, 24, 0.96));
    color: #fff;
    padding: 80px 0;
}

.reason-section .section-title {
    color: #fff;
}

.reason-section .section-subtitle {
    color: rgba(255, 255, 255, 0.75);
}

.reason-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
    margin-top: 45px;
}

.reason-card {
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 10px;
    padding: 32px 26px;
    transition: background 0.3s ease, transform 0.3s ease;
}

.reason-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-6px);
}

.reason-card .reason-icon {
    font-size: 30px;
    color: #a5d6a7;
    margin-bottom: 18px;
}

.reason-card h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: #fff;
}

.reason-card p {
    color: rgba(255, 255, 255, 0.78);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ========== 跨境服务页 - 行动区 ========== */
.cta-section {
    background-color: var(--primary-color);
    color: #fff;
    text-align: center;
    padding: 70px 0;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.cta-section p {
    font-size: 1.05rem;
    opacity: 0.85;
    margin-bottom: 32px;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
}

.cta-section .btn {
    background-color: #fff;
    color: var(--primary-color);
}

.cta-section .btn:hover {
    background-color: var(--light-color);
    color: var(--dark-color);
}

/* ========== 响应式 ========== */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.2rem;
    }
    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .contact-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 900px) {
    .flow-arrow {
        transform: rotate(90deg);
        width: 100%;
        justify-content: center;
        height: 30px;
    }
    .flow-item {
        max-width: 100%;
    }
}

@media (max-width: 820px) {
    /* 顶部导航切换为移动端模式 */
    .header-inner {
        min-height: 74px;
        padding: 10px 20px;
        gap: 15px;
    }

    .logo img {
        height: 52px;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .nav-wrapper {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--white-color);
        flex-direction: column;
        align-items: stretch;
        gap: 18px;
        padding: 24px 20px;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        border-top: 1px solid #eee;
    }

    .nav-wrapper.active {
        display: flex;
    }

    /* 移动端刀片标签 */
    .top-nav {
        flex-direction: row;
        justify-content: center;
        gap: 0;
    }

    .top-nav-item {
        width: 130px;
        height: 44px;
        font-size: 0.98rem;
        letter-spacing: 0;
    }

    .top-nav-item:first-child {
        clip-path: polygon(22px 0, 100% 0, calc(100% - 22px) 100%, 0 100%);
        padding-left: 6px;
    }

    .top-nav-item:last-child {
        clip-path: polygon(22px 0, 100% 0, 100% 100%, 0 100%);
        margin-left: -22px;
        padding-left: 28px;
    }

    /* 移动端下层导航 */
    .sub-nav {
        justify-content: flex-start;
    }

    .nav-list {
        flex-direction: column;
        gap: 14px;
        align-items: flex-start;
    }

    .nav-list a {
        font-size: 16px;
        padding: 6px 0;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .products-grid,
    .cooking-grid {
        grid-template-columns: 1fr;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .page-section {
        padding: 55px 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .social-icons {
        justify-content: center;
    }

    .cta-section h2 {
        font-size: 1.5rem;
    }

    .reason-section {
        padding: 60px 0;
    }

    .logo-rectangle {
        width: 160px;
        height: 64px;
    }

    .footer-logo .logo-rectangle {
        width: 120px;
        height: 48px;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 70px 0;
    }

    .hero-title {
        font-size: 1.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .product-card {
        margin: 0 5px;
    }

    /* 小屏刀片标签收缩 */
    .top-nav-item {
        width: 110px;
        height: 40px;
        font-size: 0.9rem;
    }

    .top-nav-item:first-child {
        clip-path: polygon(20px 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
        padding-left: 4px;
    }

    .top-nav-item:last-child {
        clip-path: polygon(20px 0, 100% 0, 100% 100%, 0 100%);
        margin-left: -20px;
        padding-left: 24px;
    }
}