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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

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

/* Header Styles */
.header {
    background-color: #0088cc;
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo h1 {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0;
}

.main-nav {
    display: flex;
    align-items: center;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav li {
    margin: 0 15px;
}

.main-nav a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    transition: all 0.3s ease;
    border-radius: 4px;
    font-weight: 500;
}

.main-nav a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    margin-left: 1rem;
}

/* Hero Section */
.hero {
    padding: 120px 0 60px;
    background: linear-gradient(135deg, #0088cc, #00a2e8);
    color: white;
    text-align: center;
}

.hero .container {
    max-width: 800px;
}

.hero-content {
    margin: 0 auto;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

.download-buttons {
    margin-top: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: white;
    color: #0088cc;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    transition: all 0.3s;
}

.btn:hover {
    background-color: #f0f0f0;
    transform: translateY(-2px);
}

.btn.primary {
    background-color: #0088cc;
    color: white;
}

.btn.primary:hover {
    background-color: #00a2e8;
}

/* Features Section */
.features {
    padding: 60px 0;
    background-color: #f9f9f9;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
    position: relative;
}

.features h2:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #0088cc;
    margin: 15px auto;
}

.features-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.feature-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.feature-card {
    flex: 1;
    min-width: 300px;
    max-width: 350px;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: #0088cc;
}

.feature-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.feature-card h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: #0088cc;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
    font-size: 1rem;
}

@media (max-width: 1200px) {
    .container {
        padding: 0 20px;
    }
    
    .feature-card,
    .download-card,
    .guide-card,
    .faq-card,
    .security-card {
        min-width: 250px;
    }
}

@media (max-width: 992px) {
    .header .container {
        padding: 0 20px;
    }
    
    .main-nav ul {
        gap: 10px;
    }
    
    .main-nav li {
        margin: 0 5px;
    }
    
    .main-nav a {
        padding: 0.4rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .feature-row,
    .download-row,
    .guide-row,
    .faq-row,
    .security-row {
        gap: 1.5rem;
    }
    
    .feature-card,
    .download-card,
    .guide-card,
    .faq-card,
    .security-card {
        min-width: 220px;
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 40px 0;
    }
    
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-content p {
        font-size: 1rem;
    }
    
    .download-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .download-buttons .btn {
        width: 100%;
        text-align: center;
    }
    
    .feature-row,
    .download-row,
    .guide-row,
    .faq-row,
    .security-row {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-card,
    .download-card,
    .guide-card,
    .faq-card,
    .security-card {
        width: 100%;
        max-width: 500px;
        min-width: auto;
    }
    
    .features,
    .download,
    .guide,
    .faq,
    .security {
        padding: 40px 0;
    }
    
    h2 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .main-nav {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: #0088cc;
        padding: 1rem 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .main-nav ul {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }
    
    .main-nav li {
        margin: 0;
        width: 100%;
        text-align: center;
    }
    
    .main-nav a {
        display: block;
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
    
    .main-nav a:hover {
        background-color: rgba(255, 255, 255, 0.1);
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 30px 0;
    }
    
    .hero-content h2 {
        font-size: 1.8rem;
    }
    
    .hero-content p {
        font-size: 0.9rem;
    }
    
    .feature-icon,
    .download-icon,
    .guide-icon,
    .faq-icon,
    .security-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .feature-card h3,
    .download-card h3,
    .guide-card h3,
    .faq-card h3,
    .security-card h3 {
        font-size: 1.3rem;
    }
    
    .feature-card p,
    .download-card p,
    .guide-card p,
    .faq-card p,
    .security-card p {
        font-size: 0.9rem;
    }
    
    .feature-features,
    .download-features,
    .guide-features,
    .faq-features,
    .security-features {
        gap: 0.8rem;
    }
    
    .feature-features span,
    .download-features span,
    .guide-features span,
    .faq-features span,
    .security-features span {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
    
    .features,
    .download,
    .guide,
    .faq,
    .security {
        padding: 30px 0;
    }
    
    .footer {
        padding: 30px 0;
    }
    
    .footer-links ul {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-links li {
        margin: 5px 0;
    }
    
    .header {
        padding: 0.8rem 0;
    }
    
    .logo h1 {
        font-size: 1.3rem;
    }
    
    .menu-toggle {
        font-size: 1.3rem;
        padding: 0.4rem;
    }
    
    .main-nav {
        padding: 0.8rem 0;
    }
    
    .main-nav ul {
        gap: 10px;
    }
    
    .main-nav a {
        padding: 0.7rem 1.2rem;
        font-size: 0.9rem;
    }
}

/* Download Section */
.download {
    padding: 60px 0;
    background-color: #fff;
}

.download h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
    position: relative;
}

.download h2:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #0088cc;
    margin: 15px auto;
}

.download-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.download-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.download-card {
    flex: 1;
    min-width: 280px;
    max-width: 400px;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.download-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: #0088cc;
}

.download-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.download-card h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: #0088cc;
}

.download-info {
    margin-bottom: 2rem;
    text-align: left;
}

.download-info p {
    color: #666;
    margin-bottom: 0.8rem;
    font-size: 1rem;
    line-height: 1.6;
}

.download-info span {
    color: #333;
    font-weight: bold;
    margin-right: 0.5rem;
}

.download-btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background-color: #0088cc;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
    transition: all 0.3s ease;
    border: 2px solid #0088cc;
}

.download-btn:hover {
    background-color: transparent;
    color: #0088cc;
    transform: translateY(-2px);
}

/* Guide Section */
.guide {
    padding: 60px 0;
    background-color: #f9f9f9;
}

.guide h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
    position: relative;
}

.guide h2:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #0088cc;
    margin: 15px auto;
}

.guide-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.guide-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.guide-card {
    flex: 1;
    min-width: 280px;
    max-width: 500px;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.guide-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.guide-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: #0088cc;
}

.guide-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.guide-card h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: #0088cc;
}

.guide-content {
    margin-bottom: 1.5rem;
}

.guide-content p {
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
}

.guide-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.guide-features span {
    background-color: #f0f7ff;
    color: #0088cc;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.guide-features span:hover {
    background-color: #0088cc;
    color: white;
    transform: translateY(-2px);
}

/* FAQ Section */
.faq {
    padding: 60px 0;
    background-color: #fff;
}

.faq h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
    position: relative;
}

.faq h2:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #0088cc;
    margin: 15px auto;
}

.faq-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.faq-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.faq-card {
    flex: 1;
    min-width: 280px;
    max-width: 500px;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.faq-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.faq-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: #0088cc;
}

.faq-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.faq-card h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: #0088cc;
}

.faq-content {
    margin-bottom: 1.5rem;
}

.faq-content p {
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.6;
}

.faq-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.faq-features span {
    background-color: #f0f7ff;
    color: #0088cc;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.faq-features span:hover {
    background-color: #0088cc;
    color: white;
    transform: translateY(-2px);
}

/* Footer */
.footer {
    background-color: #333;
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Security Section */
.security {
    padding: 60px 0;
    background-color: #f9f9f9;
}

.security h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: #333;
    position: relative;
}

.security h2:after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: #0088cc;
    margin: 15px auto;
}

.security-wrapper {
    max-width: 1200px;
    margin: 0 auto;
}

.security-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.security-card {
    flex: 1;
    min-width: 280px;
    max-width: 500px;
    background: white;
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.security-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.security-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: #0088cc;
}

.security-card h3 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    position: relative;
    padding-bottom: 0.5rem;
}

.security-card h3:after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 2px;
    background: #0088cc;
}

.security-card p {
    color: #666;
    margin-bottom: 2rem;
    font-size: 1rem;
    line-height: 1.6;
}

.security-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.security-features span {
    background-color: #f0f7ff;
    color: #0088cc;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.security-features span:hover {
    background-color: #0088cc;
    color: white;
    transform: translateY(-2px);
}

@media (max-width: 1200px) {
    .security-card {
        min-width: 250px;
    }
}

@media (max-width: 992px) {
    .security-row {
        gap: 1.5rem;
    }
    
    .security-card {
        min-width: 220px;
        padding: 2rem;
    }
}

@media (max-width: 768px) {
    .security {
        padding: 40px 0;
    }
    
    .security h2 {
        font-size: 2rem;
        margin-bottom: 2rem;
    }
    
    .security-row {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
    }
    
    .security-card {
        width: 100%;
        max-width: 500px;
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .security {
        padding: 30px 0;
    }
    
    .security-card {
        padding: 1.5rem;
    }
    
    .security-icon {
        font-size: 2.5rem;
        margin-bottom: 1rem;
    }
    
    .security-card h3 {
        font-size: 1.3rem;
    }
    
    .security-card p {
        font-size: 0.9rem;
    }
    
    .security-features {
        gap: 0.8rem;
    }
    
    .security-features span {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}