/* ===== CSS 变量 ===== v202604111708 ===== */
:root {
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #7c8ff0;
    --secondary-color: #2d3748;
    --accent-color: #f56565;
    --text-color: #1a202c;
    --text-light: #718096;
    --bg-color: #ffffff;
    --bg-light: #f7fafc;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px rgba(0,0,0,0.07);
    --shadow-hover: 0 10px 25px rgba(0,0,0,0.12);
    --shadow-card: 0 4px 15px rgba(0,0,0,0.08);
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

/* ===== 重置与基础 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; transition: color 0.3s; }
img { max-width: 100%; height: auto; }
/* 图片懒加载优化 */
img[loading="lazy"] { background: #f0f0f0; min-height: 200px; }
img[loading="lazy"]:not([src]) { opacity: 0; }

/* ===== 头部 ===== */
.site-header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow);
    position: relative;
    z-index: 1000;
    padding: 0.5rem 0;
}
.header-content {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.site-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.site-logo img {
    height: 2.5rem;
    width: auto;
    object-fit: contain;
}
.site-logo h1 {
    font-size: 1.1rem;
    color: var(--primary-color);
    font-weight: 700;
    margin: 0;
}
.site-logo:hover h1 { color: var(--primary-dark); }

/* 主内容区 */
.site-main {
    margin-top: 0;
}

/* ===== 导航 ===== */
.site-nav { flex: 1; }
.nav-menu {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}
.nav-link {
    color: var(--text-color);
    font-weight: 500;
    padding: 0.5rem 0;
    font-size: 0.95rem;
}
.nav-link:hover { color: var(--primary-color); }

/* ===== 语言切换器 ===== */
.lang-switcher {
    position: relative;
    margin-left: auto;
    z-index: 1001;
}
.lang-label {
    cursor: pointer;
    padding: 0.6rem 1.2rem;
    background: #f0f0f0;
    border-radius: 6px;
    font-weight: 600;
    display: inline-block;
    transition: all 0.3s;
    user-select: none;
}
.lang-label:hover { 
    background: #e0e0e0;
    transform: translateY(-1px);
}
.lang-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    box-shadow: var(--shadow-hover);
    border-radius: 6px;
    min-width: 160px;
    z-index: 1001;
    margin-top: 0.5rem;
    padding: 0.5rem 0;
    border: 1px solid var(--border-color);
}
.lang-switcher:hover .lang-dropdown, .lang-switcher.active .lang-dropdown { display: block; }
.lang-switcher .lang-label:focus { outline: 2px solid var(--primary-color); }
.lang-option {
    display: block;
    padding: 0.875rem 1.25rem;
    color: #333;
    text-decoration: none;
    transition: background 0.3s;
    font-size: 0.95rem;
}
.lang-option:hover, .lang-option.active {
    background: var(--primary-color);
    color: white;
}
/* 移动端语言切换器支持 */
@media (hover: none) and (pointer: coarse) {
    .lang-dropdown {
        display: none;
    }
    .lang-switcher.active .lang-dropdown {
        display: block;
        position: absolute;
        top: 100%;
        right: 0;
        background: white;
        box-shadow: var(--shadow-hover);
        border-radius: 6px;
        min-width: 160px;
        z-index: 1001;
        margin-top: 0.5rem;
        padding: 0.5rem 0;
        border: 1px solid var(--border-color);
    }
    .lang-option {
        padding: 1rem 1.25rem;
    }
}

/* ===== 按钮 ===== v202604111708 ===== */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    font-size: 1.05rem;
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: var(--bg-gradient);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.5);
}
.btn-primary:active {
    transform: translateY(-1px);
}
.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}
.btn-secondary:hover {
    background: var(--bg-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}
.btn-large {
    padding: 1.25rem 3rem;
    font-size: 1.15rem;
}
.btn-small {
    padding: 0.6rem 1.5rem;
    font-size: 0.9rem;
}

/* ===== Hero 区域 ===== v202604111708 ===== */
.hero-section {
    background: var(--bg-gradient);
    color: white;
    padding: 8rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    animation: float 6s ease-in-out infinite;
}
.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: rgba(255,255,255,0.08);
    border-radius: 50%;
    animation: float 8s ease-in-out infinite reverse;
}
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-30px); }
}
.hero-content {
    position: relative;
    z-index: 1;
}
.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    font-weight: 800;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
    animation: fadeInUp 0.8s ease-out;
}
.hero-subtitle {
    font-size: 1.35rem;
    max-width: 800px;
    margin: 0 auto 2.5rem;
    opacity: 0.95;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}
.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== 产品区域 ===== v202604111708 ===== */
.products-section { 
    padding: 6rem 0;
    background: var(--bg-light);
}
.section-title {
    font-size: 2.75rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--secondary-color);
    font-weight: 700;
}
.section-subtitle {
    text-align: center;
    color: var(--text-light);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}
.product-card {
    background: white;
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}
.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--bg-gradient);
    transform: scaleX(0);
    transition: transform 0.4s ease;
}
.product-card:hover::before {
    transform: scaleX(1);
}
.product-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}
.product-icon { 
    font-size: 4rem; 
    margin-bottom: 1.5rem;
    display: inline-block;
    transition: transform 0.3s;
}
.product-card:hover .product-icon {
    transform: scale(1.15) rotate(5deg);
}
.product-card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    font-weight: 600;
}
.product-card p { 
    color: var(--text-light); 
    font-size: 1rem;
    line-height: 1.6;
}

/* ===== 特色功能 ===== v202604111708 ===== */
.features-section {
    padding: 6rem 0;
    background: white;
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}
.feature-card {
    background: var(--bg-light);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border-color);
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-hover);
    background: white;
}
.feature-icon { 
    font-size: 4rem; 
    margin-bottom: 1.5rem;
    display: inline-block;
    transition: transform 0.4s;
}
.feature-card:hover .feature-icon {
    transform: scale(1.2) rotate(10deg);
}
.feature-card h3 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    font-weight: 600;
}
.feature-card p { 
    color: var(--text-light); 
    font-size: 1rem;
    line-height: 1.7;
}
.feature-list {
    list-style: none;
    margin-top: 1.5rem;
    text-align: left;
}
.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-color);
    font-size: 0.95rem;
}
.feature-list li::before {
    content: '✓';
    color: var(--primary-color);
    font-weight: bold;
    margin-right: 0.5rem;
}

/* ===== 联系表单 ===== v202604111708 ===== */
.contact-page {
    padding: 4rem 0;
    background: var(--bg-light);
}
.page-header {
    text-align: center;
    margin-bottom: 3rem;
}
.page-title {
    font-size: 2.75rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-weight: 700;
}
.page-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
}
.contact-info {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}
.contact-info h2 {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}
.contact-item {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--radius);
    transition: all 0.3s;
}
.contact-item:hover {
    background: white;
    box-shadow: var(--shadow);
    transform: translateX(5px);
}
.contact-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}
.contact-details h3 {
    font-size: 1.1rem;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}
.contact-details a, .contact-details p {
    color: var(--text-light);
    font-size: 1rem;
    transition: color 0.3s;
}
.contact-details a:hover {
    color: var(--primary-color);
}
.business-hours {
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: var(--radius);
}
.business-hours h3 {
    font-size: 1.2rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}
.business-hours ul {
    list-style: none;
}
.business-hours li {
    padding: 0.5rem 0;
    color: var(--text-color);
    font-size: 0.95rem;
}
.response-time {
    margin-top: 1.5rem;
    padding: 1rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: var(--radius);
    border-left: 4px solid var(--primary-color);
}
.response-time p {
    color: var(--text-color);
    font-size: 0.95rem;
    margin: 0;
}
.contact-form-section {
    background: white;
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}
.contact-form-section h2 {
    font-size: 1.8rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}
.form-description {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1rem;
}
.inquiry-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}
.form-group {
    display: flex;
    flex-direction: column;
}
.form-group.full-width {
    grid-column: 1 / -1;
}
.form-group label {
    font-weight: 600;
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}
.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: all 0.3s;
    font-family: inherit;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}
.form-group textarea {
    min-height: 150px;
    resize: vertical;
}
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-light);
}
.inquiry-form button {
    grid-column: 1 / -1;
    margin-top: 1rem;
}

/* ===== 页脚 ===== */
.site-footer {
    background: var(--secondary-color);
    color: white;
    padding: 3rem 0 1.5rem;
}
.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}
.footer-section h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}
.footer-section p { opacity: 0.9; margin-bottom: 0.5rem; }
.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}
.footer-bottom p { opacity: 0.7; font-size: 0.9rem; }

/* ===== 地图部分 ===== */
.map-section {
    padding: 5rem 0;
    background: var(--bg-light);
}
.map-container {
    max-width: 100%;
}
.map-wrapper {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: var(--shadow);
}
.map-wrapper iframe {
    display: block;
    width: 100%;
    height: 450px;
}
.map-info {
    margin-top: 2rem;
    padding: 1.5rem;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}
.map-info p {
    margin-bottom: 0.5rem;
    color: var(--text-color);
}
.map-info .btn-small {
    margin-top: 1rem;
    padding: 0.6rem 1.2rem;
    font-size: 0.9rem;
    display: inline-block;
}

/* ===== 信任元素 ===== */
.trust-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}
.trust-section .section-title {
    color: white;
    margin-bottom: 1rem;
    text-align: center;
}
.trust-section .section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}
.trust-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}
.trust-item {
    text-align: center;
    padding: 2.5rem 1.5rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    transition: all 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.trust-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}
.trust-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}
.trust-number {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}
.trust-label {
    font-size: 1rem;
    font-weight: 600;
    opacity: 1;
    margin-bottom: 0.5rem;
}
.trust-desc {
    font-size: 0.85rem;
    opacity: 0.85;
}

/* 核心优势 */
.advantages-section {
    margin: 4rem 0;
}
.advantages-title {
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2.5rem;
    color: white;
}
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}
.advantage-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem 1.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.3s;
    color: #333;
}
.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}
.advantage-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.advantage-card h4 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: #667eea;
}
.advantage-card p {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.6;
}

/* 认证标志 */
.certifications {
    text-align: center;
    padding: 2.5rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    margin-bottom: 4rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
}
.cert-title {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: white;
}
.cert-subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}
.cert-logos {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}
.cert-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: white;
    color: #667eea;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s;
}
.cert-badge:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}
.cert-badge-large {
    flex-direction: column;
    padding: 1.5rem 2.5rem;
    border-radius: var(--radius-lg);
    min-width: 180px;
}
.cert-main {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
}
.cert-sub {
    font-size: 0.85rem;
    opacity: 0.8;
    font-weight: 400;
}
.cert-note {
    font-size: 0.9rem;
    opacity: 0.85;
    margin-top: 1rem;
}

/* 尼日利亚市场专题 */
.nigeria-market-section {
    background: linear-gradient(135deg, #008751 0%, #ffffff 50%, #008751 100%);
    padding: 3rem 2rem;
    border-radius: var(--radius-lg);
    margin: 3rem 0;
    text-align: center;
    border: 3px solid #008751;
}
.nigeria-market-section .section-title {
    font-size: 2rem;
    color: #008751;
    margin-bottom: 1rem;
    font-weight: 700;
}
.nigeria-market-section .section-subtitle {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}
.nigeria-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2.5rem;
}
.nigeria-feature {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.3s;
}
.nigeria-feature:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}
.nigeria-feature .feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}
.nigeria-feature h4 {
    font-size: 1.2rem;
    color: #008751;
    margin-bottom: 0.8rem;
    font-weight: 600;
}
.nigeria-feature p {
    font-size: 0.95rem;
    color: #666;
    line-height: 1.6;
}
.nigeria-cities {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}
.city-badge {
    background: white;
    color: #008751;
    padding: 0.5rem 1.2rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    border: 2px solid #008751;
}
.nigeria-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}
.nigeria-cta .btn {
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
}
.nigeria-cta .btn-whatsapp {
    background: #25D366;
    color: white;
}
.nigeria-cta .btn-whatsapp:hover {
    background: #128C7E;
}
@media (max-width: 768px) {
    .nigeria-market-section {
        padding: 2rem 1rem;
    }
    .nigeria-market-section .section-title {
        font-size: 1.5rem;
    }
    .nigeria-market-section .section-subtitle {
        font-size: 1rem;
    }
    .nigeria-features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    .nigeria-cities {
        flex-direction: column;
        align-items: center;
    }
    .nigeria-cta {
        flex-direction: column;
    }
    .nigeria-cta .btn {
        width: 100%;
    }
}

/* 客户评价 */
.testimonials {
    text-align: center;
}
.testimonials-title {
    font-size: 1.8rem;
    margin-bottom: 2.5rem;
    color: white;
}
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.testimonial-card {
    background: rgba(255, 255, 255, 0.95);
    padding: 2rem;
    border-radius: var(--radius-lg);
    color: #333;
    transition: all 0.3s;
}
.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
}
.testimonial-stars {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    letter-spacing: 0.2rem;
}
.testimonial-text {
    font-size: 1rem;
    line-height: 1.6;
    font-style: italic;
    margin-bottom: 1rem;
    color: #555;
}
.testimonial-author {
    font-size: 0.9rem;
    color: #888;
    font-weight: 600;
}

/* ===== 移动端菜单按钮 ===== */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 21px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}
.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--secondary-color);
    border-radius: 2px;
    transition: all 0.3s;
}
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}
.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===== WhatsApp 浮窗 ===== */
.whatsapp-float {
    position: fixed;
    bottom: 25px;
    right: 25px;
    z-index: 1000;
    transition: all 0.3s;
    box-shadow: 2px 2px 15px rgba(0,0,0,0.3);
}
.whatsapp-float:hover { transform: scale(1.15); }
.whatsapp-float img { border-radius: 50%; }

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .site-header {
        padding: 0.4rem 0;
        position: relative;
    }
    .header-content {
        display: block;
        width: 100%;
    }
    /* 第一排：logo + 公司名（居中，更大更醒目） */
    .site-logo {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 0.8rem;
        padding: 0.6rem 0;
        border-bottom: 1px solid #f0f0f0;
        margin-bottom: 0.5rem;
        max-width: 100%;
        overflow: hidden;
    }
    /* LOGO 图片 - 比公司名大 2 倍左右 */
    .site-logo img {
        height: 3.2rem; /* 约 51px，是公司名 1.2rem 的约 2.7 倍 */
        max-width: 45%;
        object-fit: contain;
    }
    .site-logo h1 {
        font-size: 1.2rem;
        margin: 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        font-weight: 700;
    }
    /* 显示汉堡菜单按钮 */
    .mobile-menu-toggle {
        display: flex;
        position: absolute;
        right: 15px;
        top: 0.8rem;
        z-index: 1001;
    }
    /* 隐藏原来的导航容器 */
    .site-nav {
        display: none;
        width: 100%;
        position: absolute;
        top: 100%;
        left: 0;
        background: white;
        box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        z-index: 1000;
        padding: 1rem 0;
    }
    .site-nav.active {
        display: block;
    }
    /* 第二排：导航菜单（左对齐）+ 语言切换器（紧跟） */
    .nav-menu {
        display: flex;
        flex-direction: column;
        padding: 0;
        margin: 0;
        list-style: none;
        gap: 0;
    }
    .nav-item {
        margin: 0;
        border-bottom: 1px solid #f0f0f0;
    }
    .nav-item:last-child {
        border-bottom: none;
    }
    .nav-link {
        display: block;
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
        color: var(--text-color);
        text-decoration: none;
        transition: background 0.3s;
    }
    .nav-link:hover {
        background: #f5f5f5;
    }
    /* 语言切换器 */
    .lang-switcher {
        display: block;
        margin: 0;
        border-top: 1px solid #f0f0f0;
    }
    .lang-label {
        display: block;
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
        cursor: pointer;
    }
    .lang-dropdown {
        position: static;
        display: none;
        width: 100%;
        min-width: auto;
        box-shadow: none;
        border-top: 1px solid #f0f0f0;
    }
    .lang-dropdown.active {
        display: block;
    }
    .lang-option {
        display: block;
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
        border-bottom: 1px solid #f0f0f0;
    }
    .lang-option:last-child {
        border-bottom: none;
    }
    /* 移动端紧凑布局优化 */
    .hero-title { font-size: 1.2rem; }
    .hero-subtitle { font-size: 0.75rem; margin-bottom: 0.6rem !important; }
    .hero-section { padding: 1.2rem 0 !important; }
    .hero-buttons { gap: 0.4rem !important; }
    .hero-buttons .btn { padding: 0.4rem 0.8rem !important; font-size: 0.8rem !important; }
    .section-title { font-size: 1.1rem; margin-bottom: 0.6rem !important; }
    .section-subtitle { font-size: 0.8rem !important; margin-bottom: 0.6rem !important; }
    .products-section, .why-choose-section, .features-section { padding: 1.2rem 0 !important; }
    
    /* 产品卡片双列布局 */
    .products-grid { 
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.4rem !important;
    }
    .product-card { padding: 0.5rem !important; }
    .product-icon { font-size: 1.3rem; margin-bottom: 0.3rem !important; }
    .product-card h3 { font-size: 0.8rem; margin-bottom: 0.25rem !important; line-height: 1.2 !important; }
    .product-card p { font-size: 0.7rem; line-height: 1.2 !important; }
    
    /* 特性卡片双列布局 */
    .features-grid { 
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 0.4rem !important;
    }
    .feature-card { padding: 0.5rem !important; }
    .feature-icon { font-size: 1.3rem; margin-bottom: 0.3rem !important; }
    .feature-card h3 { font-size: 0.8rem; margin-bottom: 0.25rem !important; line-height: 1.2 !important; }
    .feature-card p { font-size: 0.7rem; line-height: 1.2 !important; }
    
    /* 统计数据紧凑 - 横向排列 */
    .stats-grid { 
        grid-template-columns: repeat(4, 1fr) !important;
        gap: 0.3rem !important;
    }
    .stat-card { padding: 0.6rem 0.3rem !important; flex-direction: column !important; }
    .stat-number { font-size: 1.3rem !important; line-height: 1.2 !important; }
    .stat-label { font-size: 0.65rem !important; line-height: 1.2 !important; }
    
    /* Why Choose Us 列表紧凑 */
    .why-choose-list { gap: 0.4rem !important; }
    .why-choose-item { padding: 0.6rem !important; }
    .why-choose-item h3 { font-size: 0.85rem !important; margin-bottom: 0.3rem !important; }
    .why-choose-item p { font-size: 0.7rem !important; line-height: 1.3 !important; }
    .why-choose-icon { font-size: 1.3rem !important; margin-bottom: 0.3rem !important; }
    .feature-list li { font-size: 0.7rem !important; margin-bottom: 0.15rem !important; padding-left: 1rem !important; }
    
    /* 核心优势紧凑 - 单行显示 */
    .core-advantages-grid { 
        grid-template-columns: repeat(4, 1fr) !important;
        gap: 0.3rem !important;
    }
    .advantage-card { padding: 0.5rem !important; flex-direction: column !important; align-items: center !important; }
    .advantage-icon { font-size: 1.5rem !important; margin-bottom: 0.3rem !important; }
    .advantage-card h4 { font-size: 0.75rem !important; margin-bottom: 0.2rem !important; line-height: 1.2 !important; }
    .advantage-card p { font-size: 0.65rem !important; line-height: 1.2 !important; }
    
    /* 认证紧凑 - 单行显示 */
    .certifications-grid { 
        grid-template-columns: repeat(3, 1fr) !important;
        gap: 0.3rem !important;
    }
    .cert-card { padding: 0.4rem !important; }
    .cert-icon { font-size: 1.5rem !important; margin-bottom: 0.2rem !important; }
    .cert-card h4 { font-size: 0.7rem !important; line-height: 1.2 !important; }
    .cert-card p { font-size: 0.6rem !important; display: none !important; }
    
    /* 评价紧凑 */
    .testimonial-card { padding: 1rem !important; margin-bottom: 0.5rem !important; }
    .testimonial-text { font-size: 0.8rem !important; }
    .testimonial-author { font-size: 0.75rem !important; }
    
    .site-main { margin-top: 0; }
    
    /* 移动端地图优化 */
    .map-section { padding: 1.5rem 0 !important; }
    .map-wrapper iframe { height: 200px !important; }
    .map-info { padding: 0.8rem !important; }
    .map-info .btn-small { width: 100%; text-align: center; padding: 0.4rem 0.8rem !important; font-size: 0.8rem !important; }
    .map-info p { font-size: 0.8rem !important; }
    
    /* 移动端内容更紧凑 */
    .container { padding: 0 12px !important; }
    .about-content { padding: 1.5rem 0 !important; }
    .about-text { padding: 0 8px; font-size: 0.85rem; }
    
    /* 页脚紧凑 */
    .site-footer { padding: 1.5rem 0 !important; }
    .footer-content { gap: 1rem !important; }
    .footer-section h3 { font-size: 0.9rem !important; margin-bottom: 0.5rem !important; }
    .footer-section p { font-size: 0.8rem !important; margin-bottom: 0.3rem !important; }
    
    /* 列表项紧凑 */
    .feature-list li { font-size: 0.8rem !important; margin-bottom: 0.2rem !important; }
    
    /* 移动端联系表单 */
    .contact-content {
        grid-template-columns: 1fr !important;
        gap: 2rem !important;
    }
    .contact-info, .contact-form-section {
        padding: 1.5rem !important;
    }
    .page-title { font-size: 1.8rem !important; }
    .page-subtitle { font-size: 0.9rem !important; }
    .contact-info h2, .contact-form-section h2 { font-size: 1.4rem !important; }
    .contact-item {
        padding: 1rem !important;
        gap: 1rem !important;
        margin-bottom: 1rem !important;
    }
    .contact-icon { font-size: 2rem !important; }
    .contact-details h3 { font-size: 1rem !important; }
    .contact-details a, .contact-details p { font-size: 0.9rem !important; }
    .inquiry-form {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 0.75rem !important;
        font-size: 0.95rem !important;
    }
    .form-group textarea { min-height: 120px !important; }
    .business-hours, .response-time {
        padding: 1rem !important;
        margin-top: 1rem !important;
    }
}

@media (max-width: 480px) {
    .site-header {
        padding: 0.3rem 0;
    }
    /* 超小屏幕 - LOGO 更大 */
    .site-logo img {
        height: 3.5rem; /* 约 56px，是公司名的约 3 倍 */
        max-width: 40%;
    }
    .site-logo h1 {
        font-size: 1.15rem;
    }
    .site-logo {
        gap: 0.7rem;
        padding: 0.5rem 0;
    }
    .nav-menu {
        gap: 0.5rem;
    }
    .nav-link {
        font-size: 0.8rem;
        padding: 0.25rem 0.4rem;
    }
    .lang-label {
        padding: 0.35rem 0.6rem;
        font-size: 0.8rem;
    }
    .hero-title { font-size: 1.5rem; }
    .hero-subtitle { font-size: 0.85rem; }
    .hero-section { padding: 2rem 0; }
    .section-title { font-size: 1.3rem; }
    .container { padding: 0 12px; }
    /* 小屏幕地图优化 */
    .map-wrapper iframe {
        height: 280px;
    }
    .map-info {
        padding: 1rem;
    }
    .map-info p {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .site-header { padding: 0.4rem 0; }
    .site-logo img {
        height: 0.95rem;
    }
    .site-logo h1 {
        font-size: 0.95rem;
    }
    .hero-section { padding: 3rem 0; }
    .hero-title { font-size: 1.5rem; }
    .container { padding: 0 15px; }
    .site-main {
        margin-top: 0;
    }
}