/* 基础样式 */
:root {
    --primary-color: #4285F4;
    --secondary-color: #34A853;
    --accent-color: #EA4335;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #757575;
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

body {
    color: var(--text-color);
    line-height: 1.6;
    background-color: var(--light-gray);
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s;
}

a:hover {
    color: var(--accent-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--white);
    color: var(--primary-color);
    border-radius: 4px;
    font-weight: 600;
    transition: all 0.3s;
    margin: 5px;
    border: none;
    cursor: pointer;
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.btn-primary:hover {
    background-color: #3367d6;
}

.btn-large {
    padding: 15px 40px;
    font-size: 18px;
}

/* 头部样式 */
header {
    background-color: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    height: 40px;
    margin-right: 10px;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

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

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    font-weight: 500;
    color: var(--text-color);
}

nav ul li a:hover {
    color: var(--primary-color);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-color);
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #4285F4 0%, #34A853 100%);
    color: var(--white);
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 42px;
    margin-bottom: 20px;
    font-weight: 700;
}

.hero p {
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto 30px;
}

.version-info {
    margin-top: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}

.download-buttons {
    margin: 30px 0;
}

/* 特性区域 */
.features {
    padding: 80px 0;
    background-color: var(--white);
}

.features h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 32px;
}

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

.feature-card {
    background-color: var(--light-gray);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 40px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
    font-size: 20px;
}

/* 下载区域 */
.download-section {
    padding: 80px 0;
    background-color: var(--light-gray);
}

.download-section h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 32px;
}

.platform-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.platform-card {
    background-color: var(--white);
    padding: 30px 20px;
    border-radius: 8px;
    text-align: center;
    transition: all 0.3s;
    color: var(--text-color);
}

.platform-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    color: var(--primary-color);
}

.platform-card i {
    font-size: 50px;
    margin-bottom: 20px;
    display: block;
}

.platform-card h3 {
    margin-bottom: 10px;
}

.platform-card p {
    font-size: 14px;
    color: var(--dark-gray);
}

/* 常见问题 */
.faq {
    padding: 80px 0;
    background-color: var(--white);
}

.faq h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 32px;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid var(--medium-gray);
    border-radius: 8px;
    overflow: hidden;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.faq-question {
    width: 100%;
    padding: 20px;
    text-align: left;
    background-color: var(--light-gray);
    border: none;
    font-size: 18px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-size: 24px;
}

.faq-question.active::after {
    content: '-';
}

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease;
}

.faq-answer.show {
    padding: 20px;
    max-height: 500px;
}

/* 页脚 */
footer {
    background-color: #202124;
    color: var(--white);
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.footer-col h4 {
    margin-bottom: 20px;
    font-size: 18px;
}

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

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

.footer-col ul li a {
    color: #9aa0a6;
}

.footer-col ul li a:hover {
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #3c4043;
    color: #9aa0a6;
    font-size: 14px;
}

.footer-bottom p {
    margin-bottom: 10px;
}