/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 500;
    margin-bottom: 0.8rem;
}

p {
    margin-bottom: 0.8rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: 5px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(45deg, #2c5aa0, #4a7bc8);
    color: white;
}

.btn-primary:hover {
    background: linear-gradient(45deg, #1e3d6f, #2c5aa0);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(44, 90, 160, 0.3);
}

.btn-secondary {
    background: transparent;
    color: #2c5aa0;
    border: 2px solid #2c5aa0;
}

.btn-secondary:hover {
    background: #2c5aa0;
    color: white;
}

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

.btn-outline:hover {
    background: white;
    color: #2c5aa0;
}

/* Header */
.header {
    background: white;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar {
    padding: 0.8rem 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.brand-text h1 {
    color: #2c5aa0;
    margin: 0;
    font-size: 1.6rem;
    display: flex;
    align-items: center;
}

.brand-text span {
    color: #666;
    font-size: 0.8rem;
    font-weight: 300;
    margin-top: -4px;
}

.nav-menu {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #2c5aa0;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

/* Hero Section - 更紧凑 */
.hero {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 100px 0 50px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><polygon fill="%23ffffff08" points="0,1000 1000,0 1000,1000"/></svg>');
    background-size: cover;
}

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

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.1rem;
    margin-bottom: 1.8rem;
    opacity: 0.9;
    line-height: 1.5;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    opacity: 0.9;
    font-size: 0.95rem;
}

.feature-item i {
    font-size: 1.1rem;
    color: #ffd700;
}

/* Section Headers - 更紧凑 */
.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-header h2 {
    font-size: 2rem;
    color: #2c5aa0;
    margin-bottom: 0.6rem;
}

.section-header p {
    font-size: 1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* Products Section - 更紧凑 */
.products {
    padding: 50px 0;
    background: white;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.product-card {
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    overflow: hidden;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.product-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.1);
}

.product-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(44, 90, 160, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-info {
    padding: 1.2rem;
}

.product-info h3 {
    color: #2c5aa0;
    margin-bottom: 0.6rem;
    font-size: 1.1rem;
}

.product-info p {
    color: #666;
    line-height: 1.5;
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
}

.product-features {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

.feature-tag {
    background: #e3f2fd;
    color: #1565c0;
    padding: 0.2rem 0.6rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* About Section - 更紧凑 */
.about {
    padding: 50px 0;
    background: #f8f9fa;
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 3rem;
    align-items: start;
}

.about-intro {
    font-size: 1.05rem;
    color: #666;
    margin-bottom: 1.5rem;
}

.factory-showcase {
    margin: 1.5rem 0;
    text-align: center;
}

.factory-image {
    width: 100%;
    max-width: 600px;
    height: auto;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
    margin-bottom: 0.8rem;
    transition: transform 0.3s ease;
}

.factory-image:hover {
    transform: scale(1.02);
}

.factory-caption {
    font-size: 0.9rem;
    color: #666;
    font-style: italic;
    margin-bottom: 1.5rem;
}

.about-highlights {
    display: grid;
    gap: 1.5rem;
}

.highlight-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.highlight-item i {
    color: #2c5aa0;
    font-size: 1.8rem;
    margin-top: 0.3rem;
    flex-shrink: 0;
}

.highlight-item h4 {
    color: #2c5aa0;
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
}

.highlight-item p {
    font-size: 0.9rem;
}

.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: #2c5aa0;
    margin-bottom: 0.3rem;
}

.stat-label {
    color: #666;
    font-weight: 500;
    font-size: 0.9rem;
}

/* Applications Section - 确保一行四个 */
.applications {
    padding: 50px 0;
    background: white;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.application-card {
    text-align: center;
    padding: 2rem 1.5rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.application-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
}

.application-card i {
    font-size: 2.5rem;
    color: #2c5aa0;
    margin-bottom: 1rem;
}

.application-card h3 {
    color: #2c5aa0;
    margin-bottom: 0.6rem;
    font-size: 1.1rem;
}

.application-card p {
    color: #666;
    line-height: 1.5;
    font-size: 0.9rem;
}

/* Certifications Section - 确保一行四个 */
.certifications {
    padding: 50px 0;
    background: #f8f9fa;
}

.cert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.cert-item {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.cert-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px rgba(0, 0, 0, 0.12);
}

.cert-badge {
    width: 70px;
    height: 70px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, #2c5aa0, #4a7bc8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cert-badge i {
    font-size: 2rem;
    color: white;
}

.cert-item h4 {
    color: #2c5aa0;
    margin-bottom: 0.4rem;
    font-size: 1.05rem;
}

.cert-item p {
    color: #666;
    font-size: 0.85rem;
}

/* Customer Section - 确保一行四个 */
.customers-section {
    text-align: center;
    padding-top: 2.5rem;
    border-top: 2px solid #e9ecef;
}

.customers-section h3 {
    color: #2c5aa0;
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
}

.customers-note {
    color: #666;
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 1rem;
}

.customer-categories {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
}

.category-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    padding: 1.5rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.category-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.12);
}

.category-item i {
    font-size: 2.5rem;
    color: #2c5aa0;
}

.category-item span {
    color: #333;
    font-weight: 500;
    text-align: center;
    font-size: 0.9rem;
}

/* Contact Section - 更紧凑 */
.contact {
    padding: 50px 0;
    background: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.info-item {
    display: flex;
    gap: 0.8rem;
    align-items: flex-start;
}

.info-item i {
    color: #2c5aa0;
    font-size: 1.2rem;
    margin-top: 0.2rem;
    flex-shrink: 0;
}

.info-item h4 {
    color: #2c5aa0;
    margin-bottom: 0.2rem;
    font-size: 0.95rem;
}

.info-item p {
    color: #666;
    line-height: 1.4;
    font-size: 0.9rem;
}

.contact-form {
    background: white;
    padding: 1.8rem;
    border-radius: 8px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 2px solid #e9ecef;
    border-radius: 5px;
    font-size: 0.95rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2c5aa0;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Footer - 更紧凑 */
.footer {
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    color: white;
    padding: 2rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-brand-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 0.6rem;
}

.footer-logo {
    height: 30px;
    width: auto;
    object-fit: contain;
}

.footer-brand h3 {
    color: #2c5aa0;
    margin: 0;
    font-size: 1.2rem;
}

.footer-brand p {
    opacity: 0.8;
    line-height: 1.5;
    font-size: 0.85rem;
}

.footer-links h4,
.footer-contact h4 {
    color: #2c5aa0;
    margin-bottom: 0.6rem;
    font-size: 1rem;
}

.footer-links a {
    display: block;
    color: white;
    text-decoration: none;
    margin-bottom: 0.3rem;
    opacity: 0.8;
    transition: opacity 0.3s ease;
    font-size: 0.85rem;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-contact p {
    margin-bottom: 0.3rem;
    opacity: 0.8;
    font-size: 0.85rem;
}

.footer-contact i {
    color: #2c5aa0;
    width: 18px;
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 1rem;
    text-align: center;
    opacity: 0.6;
    font-size: 0.8rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    background-color: white;
    margin: 8% auto;
    padding: 1.8rem;
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    position: relative;
}

.close {
    position: absolute;
    right: 1rem;
    top: 1rem;
    color: #aaa;
    font-size: 26px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #000;
}

.modal-content h3 {
    color: #2c5aa0;
    margin-bottom: 1.2rem;
    text-align: center;
}

/* Responsive Design - 平板 */
@media (max-width: 1024px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

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

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

/* Responsive Design - 手机端优化 */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

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

    .nav-toggle {
        display: block;
    }

    /* Hero 区域 - 手机端紧凑，避免被遮挡 */
    .hero {
        padding: 85px 0 30px;
        margin-top: 0;
    }

    .hero-title {
        font-size: 1.6rem;
        margin-bottom: 0.8rem;
    }

    .hero-subtitle {
        font-size: 0.95rem;
        margin-bottom: 1.2rem;
    }

    .hero-buttons {
        flex-direction: row;
        justify-content: center;
        gap: 0.6rem;
    }

    .hero-buttons .btn {
        flex: 1;
        max-width: 48%;
        padding: 0.7rem 0.8rem;
        font-size: 0.85rem;
    }

    .hero-features {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 0.8rem;
        font-size: 0.8rem;
        margin-top: 1.5rem;
        max-width: 100%;
    }

    .feature-item {
        flex-direction: column;
        text-align: center;
        gap: 0.3rem;
    }

    .feature-item i {
        font-size: 1.3rem;
    }

    .feature-item span {
        font-size: 0.75rem;
        line-height: 1.2;
    }

    /* Section 间距紧凑 */
    .products,
    .about,
    .applications,
    .certifications,
    .contact {
        padding: 35px 0;
    }

    .section-header {
        margin-bottom: 1.8rem;
    }

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

    .section-header p {
        font-size: 0.9rem;
    }

    /* 手机端产品 2x2 网格 */
    .product-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0.6rem;
    }

    .product-image {
        height: 140px;
    }

    .product-info {
        padding: 0.7rem;
    }

    .product-info h3 {
        font-size: 0.9rem;
        margin-bottom: 0.3rem;
        line-height: 1.2;
    }

    .product-info p {
        font-size: 0.75rem;
        line-height: 1.3;
        margin-bottom: 0.5rem;
    }

    .feature-tag {
        font-size: 0.65rem;
        padding: 0.12rem 0.4rem;
    }

    /* About 区域优化 */
    .about-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .about-intro {
        font-size: 0.95rem;
        margin-bottom: 1rem;
    }

    .factory-image {
        max-height: 180px;
        width: 100%;
        object-fit: cover;
    }

    .factory-caption {
        font-size: 0.8rem;
        margin-bottom: 1rem;
    }

    .about-highlights {
        gap: 1rem;
    }

    .highlight-item i {
        font-size: 1.5rem;
    }

    .highlight-item h4 {
        font-size: 0.95rem;
        margin-bottom: 0.2rem;
    }

    .highlight-item p {
        font-size: 0.85rem;
    }

    /* Stats 四列紧凑排列 */
    .about-stats {
        grid-template-columns: repeat(4, 1fr);
        gap: 0.6rem;
    }

    .stat-item {
        padding: 0.8rem 0.4rem;
    }

    .stat-number {
        font-size: 1.3rem;
        margin-bottom: 0.2rem;
    }

    .stat-label {
        font-size: 0.7rem;
        line-height: 1.2;
    }

    /* 手机端应用 2x2 网格 */
    .applications-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0.6rem;
    }

    .application-card {
        padding: 1rem 0.6rem;
    }

    .application-card i {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
    }

    .application-card h3 {
        font-size: 0.9rem;
        margin-bottom: 0.3rem;
        line-height: 1.2;
    }

    .application-card p {
        font-size: 0.75rem;
        line-height: 1.25;
    }

    /* 手机端认证两列 */
    .cert-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
        margin-bottom: 2rem;
    }

    .cert-item {
        padding: 1rem 0.6rem;
    }

    .cert-badge {
        width: 55px;
        height: 55px;
        margin-bottom: 0.6rem;
    }

    .cert-badge i {
        font-size: 1.6rem;
    }

    .cert-item h4 {
        font-size: 0.9rem;
        margin-bottom: 0.2rem;
    }

    .cert-item p {
        font-size: 0.75rem;
    }

    /* 手机端客户类别两列 */
    .customers-section {
        padding-top: 2rem;
    }

    .customers-section h3 {
        font-size: 1.4rem;
        margin-bottom: 0.5rem;
    }

    .customers-note {
        font-size: 0.85rem;
        margin-bottom: 1.2rem;
    }

    .customer-categories {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.8rem;
    }

    .category-item {
        padding: 1rem 0.6rem;
    }

    .category-item i {
        font-size: 1.8rem;
    }

    .category-item span {
        font-size: 0.8rem;
        line-height: 1.2;
    }

    /* Contact 区域紧凑优化 - 网格布局 */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 1.2rem;
    }

    .contact-info {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0.6rem 0.8rem;
    }

    .info-item {
        gap: 0.5rem;
        align-items: flex-start;
    }

    .info-item i {
        font-size: 1rem;
        margin-top: 0.1rem;
    }

    .info-item h4 {
        font-size: 0.8rem;
        margin-bottom: 0;
        font-weight: 600;
    }

    .info-item p {
        font-size: 0.75rem;
        line-height: 1.3;
    }

    .info-item p a {
        word-break: break-all;
    }

    .contact-form {
        padding: 1rem;
    }

    .form-group {
        margin-bottom: 0.7rem;
    }

    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 0.65rem;
        font-size: 0.85rem;
    }

    .form-group textarea {
        min-height: 70px;
    }

    /* Footer 紧凑优化 - 横向布局 */
    .footer {
        padding: 1.2rem 0 0.6rem;
    }

    .footer-content {
        display: grid;
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-bottom: 0.8rem;
    }

    .footer-brand {
        margin-bottom: 0.5rem;
    }

    .footer-brand-header {
        margin-bottom: 0.3rem;
    }

    .footer-logo {
        height: 24px;
    }

    .footer-brand h3 {
        font-size: 1rem;
    }

    .footer-brand p {
        font-size: 0.75rem;
        line-height: 1.3;
    }

    /* Footer 链接和联系信息横向排列 */
    .footer-links,
    .footer-contact {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0.3rem 1rem;
    }

    .footer-links h4,
    .footer-contact h4 {
        grid-column: 1 / -1;
        font-size: 0.85rem;
        margin-bottom: 0.3rem;
    }

    .footer-links a {
        font-size: 0.75rem;
        margin-bottom: 0.1rem;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .footer-contact p {
        font-size: 0.75rem;
        margin-bottom: 0.1rem;
    }

    .footer-contact i {
        width: 16px;
        font-size: 0.75rem;
    }

    .footer-bottom {
        padding-top: 0.6rem;
        font-size: 0.7rem;
        margin-top: 0.5rem;
    }
}

/* 小手机 */
@media (max-width: 480px) {
    .hero {
        padding: 80px 0 25px;
    }

    .hero-title {
        font-size: 1.3rem;
    }

    .hero-buttons .btn {
        font-size: 0.8rem;
        padding: 0.65rem 0.6rem;
    }

    .hero-features {
        gap: 0.6rem;
    }

    .feature-item i {
        font-size: 1.2rem;
    }

    .feature-item span {
        font-size: 0.7rem;
    }

    .nav-brand h1 {
        font-size: 1.1rem;
    }

    /* 小手机产品保持 2x2 */
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .product-image {
        height: 120px;
    }

    .product-info {
        padding: 0.6rem;
    }

    .product-info h3 {
        font-size: 0.85rem;
    }

    .product-info p {
        font-size: 0.7rem;
        margin-bottom: 0.4rem;
    }

    /* 小手机应用保持 2x2 */
    .applications-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .application-card {
        padding: 0.8rem 0.5rem;
    }

    .application-card i {
        font-size: 1.6rem;
    }

    .application-card h3 {
        font-size: 0.85rem;
    }

    .application-card p {
        font-size: 0.7rem;
    }

    /* Stats 保持四列但更紧凑 */
    .about-stats {
        gap: 0.4rem;
    }

    .stat-item {
        padding: 0.6rem 0.2rem;
    }

    .stat-number {
        font-size: 1.05rem;
    }

    .stat-label {
        font-size: 0.6rem;
    }

    /* Contact 信息更紧凑 */
    .contact-info {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .info-item h4 {
        font-size: 0.75rem;
    }

    .info-item p {
        font-size: 0.7rem;
    }

    /* Footer 更紧凑 */
    .footer-content {
        gap: 0.8rem;
    }

    .footer-brand p {
        font-size: 0.7rem;
    }
}

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

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 3px solid #f3f3f3;
    border-top: 3px solid #2c5aa0;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Form Success/Error Messages */
.form-message {
    padding: 0.8rem;
    border-radius: 5px;
    margin-bottom: 0.8rem;
    text-align: center;
    font-size: 0.85rem;
}

.form-message.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.form-message.error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Floating Contact Buttons */
.floating-contacts {
    position: fixed;
    right: 20px;
    bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 1500;
}

.floating-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 22px;
    text-decoration: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.3s ease;
}

.floating-btn:hover {
    transform: translateY(-3px) scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.floating-btn.whatsapp {
    background: linear-gradient(135deg, #25D366, #128C7E);
}

.floating-btn.wechat {
    background: linear-gradient(135deg, #09B83E, #07A033);
}

.floating-btn.phone {
    background: linear-gradient(135deg, #4CAF50, #388E3C);
}

.floating-btn.email {
    background: linear-gradient(135deg, #2196F3, #1976D2);
}

@media (max-width: 768px) {
    .floating-contacts {
        right: 12px;
        bottom: 12px;
        gap: 8px;
    }

    .floating-btn {
        width: 46px;
        height: 46px;
        font-size: 19px;
    }
}