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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', 'WenQuanYi Micro Hei', sans-serif;
    line-height: 1.6;
    color: #333333;
    background-color: #F5F5F5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, #1D4E89 0%, #2C5F96 100%);
    color: white;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(29, 78, 137, 0.2);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.logo p {
    font-size: 0.9rem;
    opacity: 0.9;
    color: #A8D8EA;
}

.header-contact {
    display: flex;
    align-items: center;
    gap: 30px;
    flex-wrap: wrap;
}

.mobile-header-btns {
    display: none;
    gap: 10px;
}

.header-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 2px solid #7FB069;
    border-radius: 50%;
    background: transparent;
    color: #7FB069;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
}

.header-btn:hover {
    background: #7FB069;
    color: white;
    transform: scale(1.1);
}

.header-btn i {
    font-size: 1.1rem;
}

/* Visibility Control */
.desktop-only {
    display: block;
}

.mobile-only {
    display: none;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.contact-item i {
    font-size: 1.1rem;
    color: #7FB069;
}

.contact-item a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

.contact-item a:hover {
    color: #E9C46A;
}

/* Hero Section */
.hero {
    position: relative;
    background: linear-gradient(135deg, #1D4E89 0%, #2C5F96 50%, #1D4E89 100%);
    color: white;
    padding: 80px 0;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('../images/bg.jpg') center/cover;
    opacity: 0.1;
    z-index: 1;
}

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

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: bold;
}

.hero h3 {
    font-size: 1.3rem;
    margin-bottom: 40px;
    opacity: 0.9;
    color: #FFB347;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-features .feature {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.15);
    padding: 20px 15px;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    min-width: 120px;
}

.hero-features .feature:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 255, 255, 0.1);
}

.hero-features .feature i {
    font-size: 2rem;
    color: #A8D8EA;
}

.hero-features .feature span {
    font-size: 0.9rem;
    font-weight: 500;
    color: white;
    text-align: center;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 15px 30px;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 160px;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(45deg, #C44536, #D55647);
    color: white;
    box-shadow: 0 4px 15px rgba(196, 69, 54, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(45deg, #B83E2F, #C44536);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(196, 69, 54, 0.4);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid #FFB347;
}

.btn-secondary:hover {
    background: #FFB347;
    color: white;
    transform: translateY(-2px);
}

/* Services Section */
.services {
    padding: 80px 0;
    background: white;
}

.services h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: #1D4E89;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.service-card {
    text-align: center;
    padding: 40px 20px;
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border: 1px solid #B7B7B7;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(29, 78, 137, 0.15);
}

.service-card i {
    font-size: 3rem;
    color: #4A90E2;
    margin-bottom: 20px;
}

.service-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: #1D4E89;
}

.service-card p {
    color: #666;
    line-height: 1.6;
}

/* Samples Section */
.samples {
    padding: 80px 0;
    background: #F9F9F9;
}

.samples h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 15px;
    color: #1D4E89;
}

.samples-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 50px;
}

.samples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.sample-item {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.sample-item:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.sample-item img {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

/* Process Section */
.process {
    padding: 80px 0;
    background: white;
}

.process h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: #1D4E89;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.step {
    text-align: center;
    padding: 30px 20px;
    position: relative;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(45deg, #C44536, #D55647);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 20px;
    box-shadow: 0 4px 15px rgba(196, 69, 54, 0.3);
}

.step h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: #1D4E89;
}

.step p {
    color: #666;
    line-height: 1.6;
}

/* Keywords Section */
.keywords {
    padding: 60px 0;
    background: #F9F9F9;
}

.keywords h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: #1D4E89;
}

.keywords-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: center;
}

.keyword-item {
    background: white;
    padding: 12px 24px;
    border-radius: 25px;
    border: 2px solid #1D4E89;
    color: #1D4E89;
    font-weight: 500;
    transition: all 0.3s ease;
}

.keyword-item:hover {
    background: #1D4E89;
    color: white;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background: white;
}

.contact h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: #1D4E89;
}

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

.contact-card {
    text-align: center;
    padding: 40px 30px;
    background: linear-gradient(135deg, #1D4E89 0%, #2C5F96 100%);
    color: white;
    border-radius: 15px;
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(29, 78, 137, 0.3);
}

.contact-card i {
    font-size: 3rem;
    color: #FFD93D;
    margin-bottom: 20px;
}

.contact-card h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.contact-card p {
    font-size: 1.2rem;
    font-weight: bold;
    margin-bottom: 10px;
}

.contact-card a {
    color: #E9C46A;
    text-decoration: none;
}

.contact-card a:hover {
    text-decoration: underline;
}

.contact-card small {
    opacity: 0.8;
}

/* Footer */
.footer {
    background: #1D4E89;
    color: white;
    padding: 40px 0 20px;
}

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

.footer-info h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #A8D8EA;
}

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

.disclaimer {
    font-size: 0.85rem;
    opacity: 0.8;
    color: #A8D8EA;
}

.footer-keywords {
    font-size: 0.9rem;
    opacity: 0.9;
}
.footer-keywords a{
       font-size: 0.9rem;
    color: #A8D8EA;
    margin-right: 10px;
    text-decoration: none;
}
.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Mobile Contact Fixed */
.mobile-contact {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #1D4E89 0%, #2E6BB8 50%, #4A90E2 100%);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 1000;
    box-shadow: 0 -3px 25px rgba(29, 78, 137, 0.4), 
                0 -1px 8px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    height: 50px;
}

.mobile-contact {
    display: flex;
}

.mobile-contact-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 8px 5px;
    text-decoration: none;
    color: white;
    border: none;
    background: transparent;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.mobile-contact-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.mobile-contact-btn:hover::before {
    left: 100%;
}

.mobile-contact-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.2);
}

.mobile-contact-btn:active {
    transform: translateY(0);
    background: rgba(255, 255, 255, 0.25);
}

.mobile-contact-btn i {
    font-size: 1.3rem;
    margin-bottom: 2px;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}

.mobile-contact-btn span {
    font-size: 0.75rem;
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    letter-spacing: 0.3px;
}

.phone-btn {
    border-right: 1px solid rgba(255, 255, 255, 0.2);
}

.phone-btn i {
    color: #FFD93D;
}

.phone-btn:hover i {
    color: #FFC107;
    transform: scale(1.1);
}

.wechat-btn i {
    color: #A8E6CF;
}

.wechat-btn:hover i {
    color: #81C784;
    transform: scale(1.1);
}

/* WeChat 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: 15% auto;
    padding: 30px;
    border-radius: 15px;
    width: 90%;
    max-width: 400px;
    text-align: center;
    position: relative;
}

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    position: absolute;
    right: 15px;
    top: 10px;
    cursor: pointer;
}

.close:hover,
.close:focus {
    color: #000;
}

.modal-content h3 {
    color: #1D4E89;
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.wechat-qr {
    width: 200px;
    height: 200px;
    margin: 0 auto 20px;
    border: 1px solid #ddd;
    border-radius: 10px;
}

.wechat-info {
    margin-top: 20px;
}

.wechat-info p {
    color: #666;
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 15px;
}

#wechatId {
    color: #1D4E89;
    font-weight: bold;
    background: #F5F5F5;
    padding: 4px 8px;
    border-radius: 5px;
    user-select: all;
}

.wechat-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-bottom: 15px;
}

.btn-copy, .btn-wechat {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-copy {
    background: linear-gradient(45deg, #FFB347, #FFCC80);
    color: #E65100;
}

.btn-copy:hover {
    background: linear-gradient(45deg, #FFCC80, #FFB347);
    transform: translateY(-2px);
}

.btn-wechat {
    background: linear-gradient(45deg, #07C160, #1AAD19);
    color: white;
}

.btn-wechat:hover {
    background: linear-gradient(45deg, #1AAD19, #07C160);
    transform: translateY(-2px);
}

.wechat-tip {
    font-size: 0.85rem !important;
    color: #999 !important;
    font-style: italic;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    .header-content {
        text-align: center;
    }
    
    .contact-info {
        justify-content: center;
    }
    
    .hero {
        padding: 60px 0;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    .hero h3 {
        font-size: 1.1rem;
    }
    
    .hero-features {
        gap: 20px;
        justify-content: center;
    }
    
    .hero-features .feature {
        flex-basis: calc(50% - 10px);
        max-width: 180px;
    }
    
    .services, .samples, .process, .contact {
        padding: 60px 0;
    }
    
    .services h2, .samples h2, .process h2, .contact h2 {
        font-size: 1.8rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .samples-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        grid-template-columns: 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    /* Show mobile contact on mobile */
    body {
        padding-bottom: 50px;
    }
}

/* Medium screens (481px - 600px) */
@media (max-width: 600px) and (min-width: 481px) {
    .hero-features {
        gap: 18px;
        justify-content: center;
    }
    
    .hero-features .feature {
        flex-basis: calc(50% - 9px);
        min-width: 140px;
        max-width: 160px;
    }
    
    .hero-features .feature i {
        font-size: 1.8rem;
    }
    
    .hero-features .feature span {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .hero-features {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 15px;
    }
    
    .hero-features .feature {
        flex-direction: column;
        align-items: center;
        gap: 8px;
        flex-basis: calc(50% - 7.5px);
        min-width: 110px;
        padding: 15px 10px;
    }
    
    .hero-features .feature i {
        font-size: 1.5rem;
    }
    
    .hero-features .feature span {
        font-size: 0.85rem;
        line-height: 1.2;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 250px;
    }
    
    .modal-content {
        margin: 20% auto;
        width: 95%;
    }
    
    .wechat-qr {
        width: 150px;
        height: 150px;
    }
}

/* Desktop specific styles */
@media (min-width: 769px) {
    .mobile-contact {
        display: none !important;
    }
    
    body {
        padding-bottom: 0;
    }
}

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

.service-card,
.sample-item,
.step,
.contact-card {
    animation: fadeInUp 0.6s ease-out;
}

/* High contrast for accessibility */
@media (prefers-contrast: high) {
    .btn-secondary {
        border-width: 3px;
    }
    
    .contact-item a,
    .contact-card a {
        text-decoration: underline;
    }
}

/* Testimonials Section */
.testimonials {
    padding: 80px 0;
    background: #F9F9F9;
}

.testimonials h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: #1D4E89;
}

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

.testimonial-card {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    border-left: 4px solid #81C784;
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(29, 78, 137, 0.15);
}

.testimonial-content {
    margin-bottom: 20px;
}

.testimonial-content p {
    color: #666;
    font-style: italic;
    line-height: 1.6;
    font-size: 1.1rem;
}

.testimonial-author {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.rating {
    display: flex;
    gap: 3px;
}

.rating i {
    color: #FFA726;
    font-size: 0.9rem;
}

.testimonial-author span {
    color: #1D4E89;
    font-weight: 500;
    font-size: 0.9rem;
}

/* FAQ Section */
.faq {
    padding: 80px 0;
    background: white;
}

.faq h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 60px;
    color: #1D4E89;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid #B7B7B7;
    border-radius: 10px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: #1D4E89;
    box-shadow: 0 2px 10px rgba(29, 78, 137, 0.1);
}

.faq-question {
    background: #F5F5F5;
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: #E9F4FF;
}

.faq-question h3 {
    color: #1D4E89;
    font-size: 1.1rem;
    margin: 0;
}

.faq-question i {
    color: #6B73FF;
    transition: transform 0.3s ease;
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-answer p {
    color: #666;
    line-height: 1.6;
    padding: 20px 0;
    margin: 0;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    max-height: 200px;
}

/* Certificate Knowledge Section */
.certificate-knowledge {
    padding: 80px 0;
    background: white;
}

.certificate-knowledge h2 {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 15px;
    color: #1D4E89;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 60px;
}

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.knowledge-category {
    background: #F9F9F9;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.knowledge-category:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(29, 78, 137, 0.15);
}

.category-header {
    background: linear-gradient(135deg, #1D4E89 0%, #2C5F96 100%);
    color: white;
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.category-header i {
    font-size: 2rem;
    color: #A8E6CF;
}

.category-header h3 {
    font-size: 1.3rem;
    margin: 0;
}

.knowledge-items {
    padding: 30px;
}

.knowledge-item {
    margin-bottom: 25px;
    padding-bottom: 25px;
    border-bottom: 1px solid #ddd;
}

.knowledge-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.knowledge-item h4 {
    color: #1D4E89;
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.knowledge-item p {
    color: #666;
    line-height: 1.6;
    margin-bottom: 15px;
}

.knowledge-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.knowledge-features .feature {
    background: linear-gradient(45deg, #81C784, #A5D6A7);
    color: #2E7D32;
    padding: 4px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.knowledge-tips {
    background: linear-gradient(135deg, #F9F9F9 0%, #F0F8FF 100%);
    padding: 40px;
    border-radius: 20px;
    border: 2px solid #81C784;
}

.knowledge-tips h3 {
    text-align: center;
    color: #1D4E89;
    font-size: 1.5rem;
    margin-bottom: 30px;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.tip-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    padding: 20px;
    background: white;
    border-radius: 10px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

.tip-item i {
    font-size: 1.5rem;
    color: #FF7043;
    margin-top: 5px;
    flex-shrink: 0;
}

.tip-content h4 {
    color: #1D4E89;
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.tip-content p {
    color: #666;
    line-height: 1.5;
    margin: 0;
    font-size: 0.95rem;
}

/* Mobile responsiveness updates */
@media (max-width: 768px) {
    .header-contact {
        justify-content: center;
    }
    
    .desktop-only {
        display: none;
    }
    
    .mobile-only {
        display: block;
    }
    
    .mobile-header-btns {
        display: flex;
    }
    
    .testimonials, .faq, .certificate-knowledge {
        padding: 60px 0;
    }
    
    .testimonials h2, .faq h2, .certificate-knowledge h2 {
        font-size: 1.8rem;
    }
    
    .knowledge-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .tips-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .knowledge-tips {
        padding: 30px 20px;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonial-author {
        justify-content: center;
        text-align: center;
    }
    
    .wechat-actions {
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-copy, .btn-wechat {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .mobile-contact {
        height: 45px;
    }
    
    .mobile-contact-btn {
        padding: 6px 3px;
    }
    
    .mobile-contact-btn i {
        font-size: 1.2rem;
        margin-bottom: 1px;
    }
    
    .mobile-contact-btn span {
        font-size: 0.7rem;
        letter-spacing: 0.2px;
    }
    
    body {
        padding-bottom: 45px !important;
    }
    
    .header-btn {
        width: 35px;
        height: 35px;
    }
    
    .header-btn i {
        font-size: 1rem;
    }
}

/* Print styles */
@media print {
    .mobile-contact,
    .modal {
        display: none !important;
    }
    
    .hero {
        background: none !important;
        color: black !important;
    }
    
    .contact-card {
        background: none !important;
        color: black !important;
        border: 2px solid black;
    }
}