/* 全局样式 */
:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --accent-color: #ea4335;
    --light-color: #f8f9fa;
    --dark-color: #202124;
    --gray-color: #5f6368;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #fff;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: #3367d6;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

/* 头部样式 */
.header {
    background-color: white;
    box-shadow: 0 2px 5px 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 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--dark-color);
}

.nav ul {
    display: flex;
    list-style: none;
    gap: 20px;
}

.nav a {
    text-decoration: none;
    color: var(--gray-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* 英雄区域 */
.hero {
    padding: 80px 0;
    background-color: var(--light-color);
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 40px;
}

.hero-content {
    flex: 1;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: var(--gray-color);
}

.hero-image {
    flex: 1;
}

.hero-image img {
    width: 100%;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* 功能区域 */
.features {
    padding: 80px 0;
}

.features h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
}

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

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

.feature:hover {
    transform: translateY(-10px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.feature h3 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

.feature p {
    color: var(--gray-color);
}

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

.download h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
}

.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.download-option {
    padding: 30px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.download-option h3 {
    margin-bottom: 10px;
    font-size: 1.5rem;
}

.download-option p {
    color: var(--gray-color);
    margin-bottom: 20px;
}

/* 常见问题 */
.faq {
    padding: 80px 0;
}

.faq h2 {
    text-align: center;
    margin-bottom: 50px;
    font-size: 2rem;
}

.faq-item {
    margin-bottom: 15px;
    border: 1px solid #e0e0e0;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: 20px;
    text-align: left;
    background-color: white;
    border: none;
    font-size: 1.1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
}

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

.faq-answer {
    padding: 0 20px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    background-color: #f9f9f9;
}

.faq-answer p {
    padding: 20px 0;
}

.faq-answer.show {
    max-height: 200px;
    padding: 0 20px;
}

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

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

.footer-section h4 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}

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

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

.footer-section a {
    color: #bdc1c6;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #3c4043;
    color: #9aa0a6;
    font-size: 0.9rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header .container {
        flex-direction: column;
        gap: 15px;
    }

    .nav ul {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    .hero .container {
        flex-direction: column;
    }

    .hero-content, .hero-image {
        text-align: center;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .download-options {
        grid-template-columns: 1fr;
    }
}