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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* 导航栏 */
.navbar {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}

.navbar-brand h1 {
    font-size: 1.8rem;
    font-weight: 700;
    color: #0070c9;
}

.navbar-nav ul {
    display: flex;
    list-style: none;
}

.navbar-nav ul li {
    margin-left: 20px;
}

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

.navbar-nav ul li a:hover {
    color: #0070c9;
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #0070c9, #00a8ff);
    color: #fff;
    padding: 120px 0 80px;
    text-align: center;
}

.hero-content h2 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

.btn-primary {
    display: inline-block;
    background-color: #fff;
    color: #0070c9;
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: #f8f9fa;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* 功能介绍 */
.features {
    padding: 80px 0;
    background-color: #fff;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background-color: #0070c9;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

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

/* 应用截图 */
.screenshots {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.screenshots h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.screenshot-item {
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    text-align: center;
}

.screenshot-item img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
}

/* 关于我们 */
.about {
    padding: 80px 0;
    background-color: #fff;
}

.about h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: #333;
}

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

.about-text ul {
    margin-top: 20px;
    padding-left: 20px;
}

.about-text ul li {
    margin-bottom: 10px;
    color: #666;
    line-height: 1.6;
}

.about-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    background-color: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.about-feature-item {
    text-align: center;
    padding: 20px;
    background-color: #fff;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.about-feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.about-feature-item i {
    font-size: 2.5rem;
    color: #0070c9;
    margin-bottom: 15px;
}

.about-feature-item p {
    font-size: 1.1rem;
    font-weight: 500;
    color: #333;
    margin: 0;
}

/* 荣誉与成就 */
.achievements {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.achievements h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.achievement-item {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.achievement-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.achievement-icon {
    width: 80px;
    height: 80px;
    background-color: #0070c9;
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 2rem;
}

.achievement-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: #333;
}

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

/* 联系我们 */
.contact {
    padding: 80px 0;
    background-color: #f8f9fa;
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 60px;
    color: #333;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 30px;
}

.contact-item i {
    font-size: 1.5rem;
    color: #0070c9;
    margin-right: 20px;
    margin-top: 5px;
}

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

.contact-form {
    background-color: #fff;
    padding: 40px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #0070c9;
}

/* 页脚 */
.footer {
    background-color: #333;
    color: #fff;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-section p {
    color: #ccc;
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #0070c9;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #444;
    color: #ccc;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        padding: 10px;
    }

    .navbar-nav ul {
        margin-top: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .navbar-nav ul li {
        margin: 0 10px;
    }

    .hero-content h2 {
        font-size: 2.5rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .features h2,
    .screenshots h2,
    .about h2,
    .contact h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-content h2 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .feature-card,
    .screenshot-item,
    .contact-info,
    .contact-form {
        padding: 20px;
    }

    .features h2,
    .screenshots h2,
    .about h2,
    .contact h2 {
        font-size: 1.8rem;
    }
}