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

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

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

/* 导航栏 */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 24px;
    font-weight: bold;
    color: #3498db;
}

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

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

nav ul li a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

/* 主要内容 */
main {
    margin-top: 80px;
}

section {
    padding: 80px 0;
}

h1, h2, h3 {
    margin-bottom: 20px;
}

/* 英雄区 */
#hero {
    background-color: #3498db;
    color: #fff;
    text-align: center;
    padding: 100px 0;
}

#hero h1 {
    font-size: 48px;
    margin-bottom: 20px;
}

#hero p {
    font-size: 24px;
    margin-bottom: 40px;
}

.cta-button {
    display: inline-block;
    background-color: #2ecc71;
    color: #fff;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: #27ae60;
}

/* 功能区 */
#features {
    background-color: #f9f9f9;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    text-align: center;
    padding: 20px;
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.feature-item i {
    color: #3498db;
    margin-bottom: 20px;
}

/* 工作原理 */
.steps {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
}

.step {
    text-align: center;
    flex: 1;
}

.step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    background-color: #3498db;
    color: #fff;
    border-radius: 50%;
    line-height: 40px;
    font-weight: bold;
    margin-bottom: 10px;
}

/* 价格方案 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.pricing-item {
    background-color: #fff;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 40px;
    text-align: center;
}

.pricing-item.featured {
    background-color: #3498db;
    color: #fff;
}

.pricing-item h3 {
    font-size: 24px;
}

.price {
    font-size: 36px;
    font-weight: bold;
    margin: 20px 0;
}

.pricing-item ul {
    list-style: none;
    margin-bottom: 30px;
}

.pricing-item ul li {
    margin-bottom: 10px;
}

/* 联系我们 */
form {
    display: grid;
    gap: 20px;
    max-width: 600px;
    margin: 0 auto;
}

input, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
}

textarea {
    height: 150px;
}

/* 页脚 */
footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 20px;
}