/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans SC', sans-serif;
    line-height: 1.6;
    color: #333;
}

/* 导航栏样式 */
.header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2563eb;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #2563eb;
}

/* 英雄区域样式 */
.hero {
    padding: 8rem 2rem 4rem;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1;
    padding-right: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #1e40af;
}

.hero p {
    font-size: 1.2rem;
    color: #64748b;
    margin-bottom: 2rem;
}

.cta-button {
    background-color: #2563eb;
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    text-decoration: none;
    display: inline-block;
}

.cta-button:hover {
    background-color: #1d4ed8;
    color: white;
    text-decoration: none;
}

.hero-image {
    flex: 1;
}

.hero-image img {
    max-width: 100%;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* 功能特点样式 */
.features {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.features h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #1e40af;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: #1e40af;
    margin-bottom: 1rem;
}

/* 安全保障样式 */
.security {
    padding: 4rem 2rem;
    background-color: #f8fafc;
}

.security h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #1e40af;
}

.security-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.security-text {
    width: 100%;
}

.security-text h3 {
    color: #1e40af;
    margin-bottom: 2rem;
    font-size: 1.5rem;
    text-align: center;
}

.security-text ul {
    list-style: none;
    margin-bottom: 2rem;
}

.security-text li {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    position: relative;
    color: #4b5563;
    line-height: 1.8;
}

.security-text li::before {
    content: "✓";
    color: #2563eb;
    position: absolute;
    left: 0;
    font-weight: bold;
}

.security-highlight {
    background: #f0f9ff;
    padding: 2rem;
    border-radius: 0.5rem;
    margin-top: 2rem;
}

.security-highlight p {
    color: #1e40af;
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.security-highlight ul {
    margin-bottom: 0;
}

.security-highlight li {
    color: #2563eb;
    font-weight: 500;
}

.security-image {
    flex: 1;
}

.security-image img {
    max-width: 100%;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* 价格方案样式 */
.pricing {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #1e40af;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.pricing-card {
    background: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
    transition: transform 0.3s;
}

.pricing-card.featured {
    transform: scale(1.05);
    border: 2px solid #2563eb;
}

.pricing-card:hover {
    transform: translateY(-5px);
}

.pricing-card h3 {
    color: #1e40af;
    margin-bottom: 1rem;
}

.price {
    font-size: 2rem;
    font-weight: 700;
    color: #2563eb;
    margin-bottom: 1rem;
}

.pricing-card ul {
    list-style: none;
    margin: 2rem 0;
}

.pricing-card li {
    margin-bottom: 0.5rem;
    color: #64748b;
}

.pricing-button {
    background-color: #2563eb;
    color: white;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 100%;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.pricing-button:hover {
    background-color: #1d4ed8;
    color: white;
    text-decoration: none;
}

/* 联系我们样式 */
.contact {
    padding: 4rem 2rem;
    background-color: #f8fafc;
}

.contact h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #1e40af;
}

.contact-content {
    max-width: 600px;
    margin: 0 auto;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-form input,
.contact-form textarea {
    padding: 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 0.5rem;
    font-size: 1rem;
}

.contact-form textarea {
    height: 150px;
    resize: vertical;
}

.submit-button {
    background-color: #2563eb;
    color: white;
    padding: 1rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-button:hover {
    background-color: #1d4ed8;
}

.contact-info {
    text-align: center;
    padding: 2rem;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.contact-info p {
    margin-bottom: 1rem;
    color: #64748b;
}

.contact-info .warning {
    color: #dc2626;
    font-weight: 500;
    margin-top: 1rem;
    padding: 1rem;
    background: #fee2e2;
    border-radius: 0.5rem;
}

/* 页脚样式 */
.footer {
    background-color: #1e40af;
    color: white;
    padding: 4rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section p {
    margin-bottom: 0.5rem;
    color: rgba(255,255,255,0.8);
}

.footer-link {
    color: rgba(255,255,255,0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: #60a5fa;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 6rem;
    }

    .hero-content {
        padding-right: 0;
        margin-bottom: 2rem;
    }

    .security-content {
        flex-direction: column;
    }

    .pricing-card.featured {
        transform: none;
    }
}

@media (max-width: 480px) {
    .nav {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
}