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

:root {
    --primary: #0f2c4a;
    --primary-light: #1a6fb0;
    --primary-lighter: #2d9cdb;
    --accent: #f0a500;
    --accent-dark: #d68910;
    --dark: #1a1a2e;
    --gray: #6b7280;
    --light-gray: #f4f6f8;
    --white: #ffffff;
    --text: #1f2937;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
    --radius: 12px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    background: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

ul {
    list-style: none;
}

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

/* ========== 导航栏 ========== */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 10px rgba(0, 0, 0, 0.06);
    z-index: 1000;
    transition: var(--transition);
}

#navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.logo-sub {
    font-size: 0.65rem;
    color: var(--gray);
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    gap: 8px;
}

.nav-link {
    padding: 8px 14px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary-light);
    background: var(--light-gray);
}

.nav-link.active {
    color: var(--primary);
    font-weight: 600;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.lang-switch {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
}

.lang-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray);
    transition: var(--transition);
    border-radius: 6px;
}

.lang-btn.active {
    color: var(--primary);
    background: var(--light-gray);
}

.lang-divider {
    color: var(--gray);
    font-size: 0.8rem;
}

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

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 主视觉区 ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #0f2c4a 0%, #1a3a5c 40%, #1a6fb0 100%);
    overflow: hidden;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" viewBox="0 0 60 60"><g fill="none" fill-rule="evenodd"><g fill="%23ffffff" fill-opacity="0.03"><circle cx="30" cy="30" r="2"/></g></g></svg>');
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 0 24px;
    max-width: 800px;
    animation: fadeInUp 1s ease;
}

.hero-title {
    font-size: 2.8rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.3;
    margin-bottom: 20px;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 36px;
    font-weight: 400;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 36px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--accent-dark);
    border-color: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(240, 165, 0, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: #fff;
    transform: translateY(-2px);
}

/* 浅色背景上使用的 outline 按钮（与 expo-card-link 同色） */
.btn-outline.btn-on-light {
    color: var(--primary-light);
    border-color: var(--primary-light);
}

.btn-outline.btn-on-light:hover {
    background: rgba(26, 111, 176, 0.08);
    border-color: var(--primary);
    color: var(--primary);
}

.btn-full {
    width: 100%;
    margin-top: 8px;
}

.hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.8rem;
    text-align: center;
    z-index: 2;
}

.scroll-arrow {
    width: 20px;
    height: 32px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 12px;
    margin: 8px auto 0;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 3px;
    height: 8px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 2px;
    animation: scrollDown 1.5s infinite;
}

@keyframes scrollDown {
    0% { opacity: 0; top: 6px; }
    50% { opacity: 1; }
    100% { opacity: 0; top: 18px; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== 数据亮点 ========== */
.stats-section {
    padding: 60px 0;
    background: var(--white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    text-align: center;
}

.stat-item {
    padding: 24px 16px;
    border-right: 1px solid #e5e7eb;
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-number span {
    color: var(--accent);
    font-size: 2rem;
}

.stat-label {
    font-size: 0.95rem;
    color: var(--gray);
    font-weight: 500;
}

/* ========== 通用 Section Header ========== */
.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 1.05rem;
    color: var(--gray);
}

/* ========== 展会卡片 ========== */
.exhibitions-section {
    padding: 80px 0;
    background: var(--light-gray);
}

.exhibitions-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.exhibition-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.exhibition-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.expo-tag {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--accent);
    color: var(--dark);
    padding: 4px 14px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    z-index: 3;
}

.expo-image {
    height: 160px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.expo-image-text {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: 2px;
}

.expo-body {
    padding: 24px;
}

.expo-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.expo-name-en {
    font-size: 0.85rem;
    color: var(--gray);
    margin-bottom: 16px;
}

.expo-info {
    margin-bottom: 16px;
}

.expo-info-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 6px;
}

.expo-icon {
    font-size: 1rem;
}

.expo-desc {
    font-size: 0.9rem;
    color: var(--gray);
    line-height: 1.6;
    margin-bottom: 16px;
}

.expo-cta {
    display: inline-block;
    color: var(--primary-light);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition);
}

.expo-cta:hover {
    color: var(--accent);
    transform: translateX(4px);
}

/* ========== 服务流程 ========== */
.process-section {
    padding: 80px 0;
    background: var(--white);
}

.process-timeline {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.process-step {
    text-align: left;
    padding: 28px;
    background: var(--light-gray);
    border-radius: var(--radius);
    position: relative;
    transition: var(--transition);
}

.process-step:hover {
    background: #eef2f7;
    transform: translateY(-4px);
}

.process-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-light);
    opacity: 0.3;
    margin-bottom: 8px;
    line-height: 1;
}

.process-step h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
}

.process-step p {
    font-size: 0.9rem;
    color: var(--gray);
    line-height: 1.6;
}

/* ========== 为什么选我们 ========== */
.why-section {
    padding: 80px 0;
    background: var(--light-gray);
}

.why-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

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

.why-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.why-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.why-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
}

.why-card p {
    font-size: 0.9rem;
    color: var(--gray);
    line-height: 1.6;
}

/* ========== 询盘表单 ========== */
.inquiry-section {
    padding: 80px 0;
    background: var(--white);
}

.inquiry-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
    align-items: start;
}

.inquiry-left .section-title {
    text-align: left;
}

.inquiry-desc {
    color: var(--gray);
    font-size: 1rem;
    margin-bottom: 32px;
}

.wechat-card {
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--light-gray);
    padding: 24px;
    border-radius: var(--radius);
}

.wechat-qr {
    width: 140px;
    height: 140px;
    background: var(--white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid #e5e7eb;
    flex-shrink: 0;
    overflow: hidden;
    padding: 6px;
}

.wechat-qr img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
}

.qr-placeholder {
    font-size: 0.75rem;
    color: var(--gray);
    text-align: center;
    line-height: 1.4;
}

.wechat-info {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
}

.wechat-info h4 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 8px;
    writing-mode: horizontal-tb;
    text-orientation: mixed;
}

.wechat-info p {
    font-size: 0.9rem;
    color: var(--text);
    margin-bottom: 4px;
    writing-mode: horizontal-tb;
    text-orientation: mixed;
}

.inquiry-form {
    background: var(--light-gray);
    padding: 36px;
    border-radius: var(--radius);
}

.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 0.95rem;
    color: var(--text);
    background: var(--white);
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(26, 111, 176, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.form-note {
    text-align: center;
    font-size: 0.85rem;
    color: var(--gray);
    margin-top: 12px;
}

.form-note.success {
    color: #10b981;
    font-weight: 600;
}

/* ========== 页脚 ========== */
.footer {
    background: var(--primary);
    color: rgba(255, 255, 255, 0.8);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
}

.footer-tagline {
    font-size: 0.9rem;
    line-height: 1.6;
    max-width: 280px;
}

.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-list li {
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.footer-list a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition);
}

.footer-list a:hover {
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: 20px 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ========== 浮动按钮 ========== */
.float-cta {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--accent);
    color: var(--dark);
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(240, 165, 0, 0.4);
    z-index: 900;
    transition: var(--transition);
    cursor: pointer;
}

.float-cta:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 25px rgba(240, 165, 0, 0.5);
}

.float-icon {
    font-size: 1.4rem;
    line-height: 1;
}

.float-text {
    font-size: 0.65rem;
    font-weight: 700;
}

/* ========== 响应式 ========== */
@media (max-width: 968px) {
    .exhibitions-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .inquiry-wrapper {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
        transform: translateY(-150%);
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
    }

    .nav-link {
        display: block;
        padding: 14px;
        border-bottom: 1px solid #f0f0f0;
    }

    .hamburger {
        display: flex;
    }

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

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .stat-item {
        border-right: none;
        border-bottom: 1px solid #e5e7eb;
        padding: 20px 12px;
    }

    .stat-item:nth-last-child(-n+2) {
        border-bottom: none;
    }

    .stat-number {
        font-size: 2.2rem;
    }

    .exhibitions-grid {
        grid-template-columns: 1fr;
    }

    .process-timeline {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .why-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

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

    .inquiry-form {
        padding: 24px;
    }

    .wechat-card {
        flex-direction: column;
        text-align: center;
    }

    .float-cta {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-item {
        border-bottom: 1px solid #e5e7eb;
    }

    .stat-item:last-child {
        border-bottom: none;
    }
}

/* ========== 展会列表页样式 ========== */
.page-hero {
    min-height: 320px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding-top: 120px;
    padding-bottom: 60px;
    text-align: center;
}

.page-hero .hero-content {
    position: relative;
    z-index: 2;
}

.exhibitions-list-section {
    padding: 80px 0;
    background: #f8fafc;
}

.exhibitions-grid.modern {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 40px;
}

.exhibition-card-modern {
    background: var(--white);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.exhibition-card-modern:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.expo-card-banner {
    height: 110px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    position: relative;
}

.expo-card-banner::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 24px;
    background: inherit;
    border-radius: 4px;
    transform-origin: center;
    transform: translateX(-50%) rotate(45deg);
    z-index: 1;
}

.expo-card-banner-text {
    color: white;
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 1px;
    text-align: center;
    z-index: 2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
}

.expo-card-body {
    padding: 32px 24px 28px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.expo-card-title {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 6px;
    line-height: 1.3;
}

.expo-card-subtitle {
    font-size: 0.85rem;
    color: var(--gray);
    margin-bottom: 18px;
    font-style: italic;
}

.expo-card-meta {
    margin-bottom: 18px;
}

.expo-card-meta-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.92rem;
    color: var(--text);
    margin-bottom: 8px;
}

.expo-card-icon {
    font-size: 1rem;
    min-width: 20px;
    text-align: center;
}

.expo-card-desc {
    font-size: 0.92rem;
    color: var(--gray);
    line-height: 1.7;
    margin-bottom: 20px;
    flex: 1;
}

.expo-card-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: auto;
}

.expo-card-link {
    display: inline-flex;
    align-items: center;
    font-weight: 700;
    color: var(--primary-light);
    transition: var(--transition);
    font-size: 0.95rem;
}

.expo-card-link:hover {
    color: var(--primary);
    transform: translateX(3px);
}

.expo-card-link.secondary {
    color: var(--gray);
    font-weight: 600;
}

.expo-card-link.secondary:hover {
    color: var(--primary-light);
}

@media (max-width: 968px) {
    .exhibitions-grid.modern {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .exhibitions-grid.modern {
        grid-template-columns: 1fr;
    }

    .page-hero {
        min-height: 260px;
        padding-top: 100px;
    }
}