/* 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;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    line-height: 1.6;
}

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

/* 头部样式 */
.header {
    text-align: center;
    padding: 40px 20px;
    color: white;
}

.logo h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    letter-spacing: 2px;
}

.tagline {
    font-size: 1.2rem;
    opacity: 0.9;
    font-weight: 300;
}

/* 主要内容 */
.main-content {
    background: white;
    border-radius: 20px;
    padding: 60px 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Hero 部分 */
.hero {
    text-align: center;
    margin-bottom: 60px;
}

.hero-title {
    font-size: 2.5rem;
    color: #2d3748;
    margin-bottom: 15px;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: #718096;
    font-weight: 300;
}

/* 功能特性网格 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 60px;
}

.feature-card {
    background: linear-gradient(135deg, #f6f8fb 0%, #ffffff 100%);
    padding: 40px 30px;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(102, 126, 234, 0.2);
    border-color: #667eea;
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.feature-card h3 {
    font-size: 1.4rem;
    color: #2d3748;
    margin-bottom: 15px;
    font-weight: 600;
}

.feature-card p {
    color: #718096;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 更多功能部分 */
.more-features {
    margin-bottom: 60px;
    text-align: center;
}

.section-title {
    font-size: 2rem;
    color: #2d3748;
    margin-bottom: 40px;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.more-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.more-feature-item {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    padding: 25px 20px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    transition: all 0.3s ease;
    border: 2px solid #e9ecef;
    cursor: pointer;
}

.more-feature-item:hover {
    transform: translateY(-5px);
    border-color: #667eea;
    background: linear-gradient(135deg, #f8f9ff 0%, #ffffff 100%);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.15);
}

.more-icon {
    font-size: 2rem;
    display: inline-block;
    transition: transform 0.3s ease;
}

.more-feature-item:hover .more-icon {
    transform: scale(1.2) rotate(5deg);
}

.more-text {
    font-size: 1rem;
    color: #2d3748;
    font-weight: 500;
}

/* 下载部分 */
.download-section {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    margin-bottom: 40px;
}

.download-btn {
    background: white;
    color: #667eea;
    border: none;
    padding: 18px 50px;
    font-size: 1.3rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.download-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.download-btn:active {
    transform: scale(0.98);
}

.download-icon {
    font-size: 1.5rem;
}

.download-info {
    color: white;
    margin-top: 20px;
    font-size: 0.95rem;
    opacity: 0.9;
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 30px 20px;
    color: white;
}

.beian {
    margin-bottom: 10px;
}

.beian a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.beian a:hover {
    opacity: 1;
    text-decoration: underline;
}

.copyright {
    font-size: 0.9rem;
    opacity: 0.7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .logo h1 {
        font-size: 2.5rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .main-content {
        padding: 40px 20px;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .download-btn {
        padding: 15px 40px;
        font-size: 1.1rem;
    }

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

    .section-title {
        font-size: 1.6rem;
    }
}