:root {
    --primary: #0066cc;
    --dark: #004499;
    --light: #e6f2ff;
    --accent: #ff6600;
    --text: #333333;
    --gray: #666666;
    --bg: #f8f9fa;
    --white: #ffffff;
    --border: #dddddd;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 12px 32px rgba(0, 0, 0, 0.12);
    --radius: 12px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
}

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

/* 头部导航 */
.header {
    background: linear-gradient(135deg, var(--primary), var(--dark));
    color: var(--white);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.header-top {
    background: rgba(0, 0, 0, 0.15);
    padding: 8px 0;
    font-size: 14px;
}

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

.hotline {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hotline-icon {
    width: 18px;
    height: 18px;
    fill: var(--white);
}

.top-link {
    color: var(--white);
    text-decoration: none;
    transition: opacity 0.2s;
}

.top-link:hover {
    opacity: 0.8;
}

.header-main {
    padding: 12px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--white);
    flex-shrink: 0;
}

.logo-img {
    width: 80px;
    height: 58px;
    border-radius: 50%;
    border: 3px solid var(--accent);
    background: var(--white);
    object-fit: cover;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-size: 20px;
    font-weight: 700;
    line-height: 1.2;
}

.logo-sub {
    font-size: 13px;
    opacity: 0.85;
}

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

.nav a {
    color: var(--white);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 6px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s, opacity 0.3s;
}

.nav a:hover {
    border-bottom-color: var(--accent);
    opacity: 0.9;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    flex-shrink: 0;
    z-index: 10;
}

.hamburger span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--white);
    border-radius: 2px;
    transition: 0.3s;
}

/* 主视觉 */
.hero {
    background: linear-gradient(135deg, var(--primary), #003366);
    color: var(--white);
    padding: 70px 0 60px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -5%;
    width: 550px;
    height: 550px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 50%;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    background: var(--accent);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 18px;
}

.hero h1 {
    font-size: 40px;
    line-height: 1.2;
    margin-bottom: 12px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    margin-bottom: 24px;
}

.hero-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    margin-bottom: 28px;
}

.info-item {
    background: rgba(255, 255, 255, 0.12);
    padding: 14px 16px;
    border-radius: 8px;
    backdrop-filter: blur(6px);
    display: flex;
    flex-direction: column;
}

.info-item .label {
    font-size: 12px;
    opacity: 0.75;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-item .value {
    font-size: 16px;
    font-weight: 600;
}

.hero-cta {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 30px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
}

.btn-primary:hover {
    background: #e55a00;
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(255, 102, 0, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid var(--white);
}

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

.hero-visual {
    background: var(--white);
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.hero-visual img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.hero-visual-caption {
    margin-top: 10px;
    color: var(--gray);
    font-size: 14px;
}

/* 通用区块 */
.section {
    padding: 65px 0;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-title h2 {
    font-size: 32px;
    color: var(--dark);
    margin-bottom: 8px;
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    display: block;
    width: 56px;
    height: 4px;
    background: var(--accent);
    margin: 10px auto 0;
    border-radius: 2px;
}

.section-title p {
    color: var(--gray);
    font-size: 16px;
    max-width: 600px;
    margin: 0 auto;
}

/* 简介 */
.intro {
    background: var(--white);
}

.intro-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

.intro-text {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray);
}

.intro-text strong {
    color: var(--primary);
    font-weight: 600;
}

.intro-img {
    display: block;
    max-width: 70%;
    width: 100%;
    height: auto;
    border-radius: 14px;
    margin: 24px auto 0;
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.intro-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-hover);
}

.intro-stats {
    display: grid;
    gap: 20px;
}

.stat-card {
    background: var(--light);
    padding: 24px;
    border-radius: 10px;
    text-align: center;
    border-left: 5px solid var(--primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.stat-number {
    font-size: 34px;
    font-weight: 700;
    color: var(--primary);
    display: block;
}

.stat-label {
    font-size: 15px;
    color: var(--gray);
    margin-top: 6px;
}

/* 价值链 */
.value-chain {
    background: var(--dark);
    color: var(--white);
    padding: 50px 0;
}

.value-chain h3 {
    text-align: center;
    font-size: 26px;
    margin-bottom: 30px;
    font-weight: 600;
}

.chain-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 18px;
    text-align: center;
}

.chain-item {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 12px;
    backdrop-filter: blur(8px);
    transition: transform 0.3s, background 0.3s;
}

.chain-item:hover {
    transform: translateY(-4px);
    background: rgba(255, 255, 255, 0.18);
}

.chain-item img {
    width: 72px;
    height: 72px;
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 10px;
    background: var(--white);
}

.chain-item p {
    font-size: 14px;
    font-weight: 600;
}

/* 展览范围 */
.categories {
    background: var(--bg);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

.category-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border-top: 4px solid var(--primary);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.category-icon {
    width: 48px;
    height: 48px;
    background: var(--light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 14px;
}

.category-card h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 10px;
}

.category-card ul {
    list-style: none;
    color: var(--gray);
    font-size: 15px;
}

.category-card li {
    padding: 5px 0;
    padding-left: 16px;
    position: relative;
}

.category-card li::before {
    content: '•';
    color: var(--accent);
    position: absolute;
    left: 0;
    font-weight: bold;
}

/* 参展费用 */
.pricing {
    background: var(--white);
}

.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.pricing-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
}

.pricing-table thead {
    background: var(--primary);
    color: var(--white);
}

.pricing-table th {
    padding: 16px 20px;
    text-align: left;
    font-weight: 600;
    font-size: 16px;
}

.pricing-table td {
    padding: 14px 20px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

.pricing-table tbody tr:hover {
    background: var(--light);
}

.pricing-table .price {
    font-weight: 700;
    color: var(--accent);
    font-size: 18px;
}

.alert-box {
    background: #fff8e7;
    border-left: 5px solid var(--accent);
    padding: 18px 22px;
    border-radius: 0 8px 8px 0;
    display: flex;
    gap: 14px;
    align-items: flex-start;
    color: #5a4a2e;
    font-size: 15px;
}

.alert-icon {
    font-size: 22px;
    flex-shrink: 0;
}

/* 参展手续 */
.process {
    background: var(--bg);
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 30px;
}

.step-card {
    background: var(--white);
    padding: 32px 24px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    position: relative;
}

.step-number {
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: var(--accent);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.step-card h4 {
    margin-top: 12px;
    margin-bottom: 8px;
    color: var(--dark);
    font-size: 18px;
}

.step-card p {
    color: var(--gray);
    font-size: 15px;
}

/* 联系 */
.contact {
    background: linear-gradient(135deg, var(--primary), var(--dark));
    color: var(--white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.contact-info h2 {
    font-size: 30px;
    margin-bottom: 12px;
}

.contact-org {
    font-size: 16px;
    opacity: 0.9;
    margin-bottom: 20px;
}

.contact-details {
    display: grid;
    gap: 18px;
}

.contact-item {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.contact-icon {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    font-size: 15px;
    margin-bottom: 2px;
}

.contact-item span {
    font-size: 15px;
    opacity: 0.9;
}

.wechat-card {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(10px);
    padding: 30px 24px;
    border-radius: 16px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.wechat-card h3 {
    font-size: 22px;
    margin-bottom: 6px;
}

.wechat-subtitle {
    font-size: 14px;
    opacity: 0.8;
    margin-bottom: 18px;
}

.wechat-qr-wrapper {
    display: inline-block;
    position: relative;
    cursor: pointer;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s, box-shadow 0.3s;
    background: #fff;
    padding: 8px;
}

.wechat-qr-wrapper:hover {
    transform: scale(1.04);
    box-shadow: 0 8px 28px rgba(0, 0, 0, 0.35);
}

.wechat-qr-img {
    display: block;
    width: 180px;
    height: 180px;
    object-fit: contain;
    border-radius: 10px;
}

.qr-zoom-hint {
    position: absolute;
    bottom: 14px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    color: #fff;
    font-size: 12px;
    padding: 5px 14px;
    border-radius: 20px;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.wechat-qr-wrapper:hover .qr-zoom-hint {
    opacity: 1;
}

.wechat-tip {
    margin-top: 14px;
    font-size: 13px;
    opacity: 0.7;
}

/* 页脚 */
.footer {
    background: #001a33;
    color: var(--white);
    padding: 30px 0;
    text-align: center;
    font-size: 14px;
}

.footer-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
}

.footer-link:hover {
    text-decoration: underline;
}

.footer-sub {
    margin-top: 8px;
    opacity: 0.7;
}

/* 二维码弹窗 */
.qr-modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.qr-modal-overlay.active {
    display: flex;
}

.qr-modal-content {
    position: relative;
    background: #fff;
    border-radius: 18px;
    padding: 20px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
    cursor: default;
    max-width: 92vw;
    max-height: 92vh;
}

.qr-modal-content img {
    display: block;
    max-width: 400px;
    width: 100%;
    height: auto;
    border-radius: 12px;
}

.qr-modal-close {
    position: absolute;
    top: -14px;
    right: -14px;
    width: 36px;
    height: 36px;
    background: #fff;
    border: none;
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
    color: #333;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background 0.2s;
}

.qr-modal-close:hover {
    background: #f0f0f0;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .hero-content,
    .intro-grid,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .hero h1 {
        font-size: 28px;
    }
    .hero-visual {
        order: -1;
    }

    /* 移动端导航菜单 */
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--dark);
        flex-direction: column;
        gap: 0;
        padding: 8px 0;
        box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
        border-radius: 0 0 12px 12px;
        z-index: 5;
    }
    .nav.active {
        display: flex;
    }
    .nav a {
        padding: 12px 24px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.12);
    }

    /* ✅ 修复：确保汉堡按钮在移动端靠右对齐 */
    .hamburger {
        display: flex;
        margin-left: auto;        /* 强制推至最右侧 */
        position: relative;
        z-index: 20;
    }

    .header-main {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .intro-img {
        max-width: 85%;
    }
    .chain-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 24px;
    }
    .hero-info {
        grid-template-columns: 1fr;
    }
    .categories-grid {
        grid-template-columns: 1fr;
    }
    .process-steps {
        grid-template-columns: 1fr;
    }
    .wechat-qr-img {
        width: 150px;
        height: 150px;
    }
    .logo-img {
        width: 70px;
        height: 50px;
    }
}