/* 基础样式设置 */
:root {
    --primary-color: #4285f4;
    --primary-dark: #3367d6;
    --secondary-color: #f8f9fa;
    --text-color: #202124;
    --text-light: #5f6368;
    --gray-light: #e0e0e0;
    --white: #ffffff;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

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

body {
    font-family: 'Noto Sans SC', sans-serif;
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

h1, h2, h3, h4 {
    margin-bottom: 20px;
    line-height: 1.3;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 50px;
}

h3 {
    font-size: 1.5rem;
    font-weight: 500;
}

p {
    margin-bottom: 15px;
    color: var(--text-light);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

section {
    padding: 100px 0;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
}

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

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

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

.btn-secondary:hover {
    background-color: var(--gray-light);
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background-color: var(--white);
    box-shadow: var(--shadow);
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo img {
    height: 40px;
    width: 40px;
    object-fit: contain;
    margin-right: 10px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
}

.nav-links li {
    margin: 0 15px;
}

.nav-links a {
    color: var(--text-color);
    font-weight: 500;
}

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

/* 移动端导航按钮 */
.download-btn-small {
    display: none;
}

/* 英雄区域 */
.hero {
    padding-top: 150px;
    background-color: var(--secondary-color);
    overflow: hidden;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.hero-image img {
    max-height: 600px;
    max-width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transform: translateY(20px);
    filter: drop-shadow(0px 10px 20px rgba(0, 0, 0, 0.15));
}

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

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

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

.feature-card:hover {
    transform: translateY(-5px);
}

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

/* 应用预览 */
.app-preview {
    background-color: var(--secondary-color);
}

.screenshots {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.screenshot {
    flex: 1;
    min-width: 250px;
    max-width: 300px;
    text-align: center;
}

.screenshot img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 15px;
    border: 1px solid var(--gray-light);
}

/* 下载区域 */
.download {
    text-align: center;
}

.download-options {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 50px;
    flex-wrap: wrap;
}

.download-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    background-color: var(--white);
    transition: transform 0.3s ease;
    min-width: 200px;
}

.download-option:hover {
    transform: scale(1.05);
}

.download-option img {
    height: 60px;
    margin-bottom: 15px;
}

/* FAQ区域 */
.faq {
    background-color: var(--secondary-color);
}

.faq-items {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--white);
    border-radius: var(--radius);
    margin-bottom: 15px;
    overflow: hidden;
}

.faq-question {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
}

.faq-question h3 {
    margin-bottom: 0;
}

.toggle {
    font-size: 1.5rem;
    font-weight: 700;
}

.faq-answer {
    padding: 0 20px 20px;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-item.active .toggle {
    transform: rotate(45deg);
}

/* 页脚 */
footer {
    background-color: var(--text-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    margin-bottom: 30px;
}

.footer-logo {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.footer-logo img {
    height: 40px;
    width: 40px;
    object-fit: contain;
    margin-right: 10px;
    border-radius: 8px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 60px;
}

.footer-column h4 {
    color: var(--white);
    margin-bottom: 15px;
}

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

.footer-column a {
    color: var(--gray-light);
}

.footer-column a:hover {
    color: var(--white);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--gray-light);
}

.beian {
    color: var(--gray-light);
    font-size: 0.9rem;
    text-decoration: none;
    transition: color 0.3s ease;
}

.beian:hover {
    color: var(--white);
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 992px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-content {
        margin-bottom: 40px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-image {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .download-btn-small {
        display: block;
    }

    .footer-content {
        flex-direction: column;
    }

    .footer-links {
        margin-top: 30px;
    }
}

@media (max-width: 576px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    section {
        padding: 60px 0;
    }

    .download-options {
        flex-direction: column;
        align-items: center;
    }

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

    .screenshots {
        flex-direction: column;
        align-items: center;
    }
}