/* 全局样式 */
body {
    font-family: 'San Francisco', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #F2F2F7;
    color: #3A3A3C;
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* 头部导航 */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: #1C1C1E;
    color: #FFFFFF;
    z-index: 1000;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header nav a {
    color: #FFFFFF;
    text-decoration: none;
    margin-left: 20px;
    font-size: 18px;
}

/* Hero 区域 */
.hero {
    height: 100vh;
    background: linear-gradient(135deg, #1C1C1E, #0A84FF);
    color: #FFFFFF;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 100px;
}

.hero h1 {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.hero p {
    font-size: 32px;
    margin-bottom: 30px;
}

.hero .cta-button {
    background-color: #0A84FF;
    color: #FFFFFF;
    border: none;
    padding: 15px 30px;
    font-size: 20px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.hero .cta-button:hover {
    background-color: #0972d3;
}

/* 功能与性能 */
.features {
    background-color: #FFFFFF;
    padding: 50px 20px;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
}

.feature-item {
    flex: 1 1 45%;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
}

.feature-item img {
    max-width: 100px;
    margin-right: 20px;
}

.feature-item h3 {
    font-size: 24px;
    margin-bottom: 10px;
}

/* 设计与外观 */
.design {
    background-color: #F2F2F7;
    padding: 50px 20px;
    text-align: center;
}

.design img {
    max-width: 100%;
    height: auto;
    margin-bottom: 20px;
}

/* 质量与耐用性 */
.quality {
    background-color: #FFFFFF;
    padding: 50px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.quality-item {
    background-color: #F2F2F7;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.quality-item img {
    max-width: 50px;
    margin-bottom: 10px;
}

/* 用户价值维度 */
.value {
    background-color: #F2F2F7;
    padding: 50px 20px;
    text-align: center;
}

.value h2 {
    margin-bottom: 30px;
}

.value p {
    font-size: 20px;
    margin-bottom: 20px;
}

/* 呼叫行动 */
.cta {
    background-color: #0A84FF;
    color: #FFFFFF;
    padding: 50px 20px;
    text-align: center;
}

.cta h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.cta a {
    background-color: #FFFFFF;
    color: #0A84FF;
    text-decoration: none;
    padding: 15px 30px;
    font-size: 20px;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.cta a:hover {
    background-color: #e0e0e0;
}

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

    header nav a {
        margin: 10px 0;
    }

    .hero {
        padding-top: 150px;
    }

    .features {
        flex-direction: column;
    }

    .feature-item {
        flex: 1 1 100%;
    }
}