/* 基础样式 */
:root {
    --color-primary: #0366d6;
    --color-primary-hover: #0353b3;
    --color-secondary: #6c757d;
    --color-accent: #28a745;
    --color-accent-hover: #218838;
    --color-text: #24292e;
    --color-text-secondary: #586069;
    --color-border: #e1e4e8;
    --color-bg: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-bg-tertiary: #fafbfc;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --border-radius: 6px;
    --transition: all 0.2s ease-in-out;
}

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

/* 粒子背景样式 */
#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
    background-color: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    color: var(--color-text);
    line-height: 1.5;
    background-color: transparent;
    position: relative;
}

.main-content {
    position: relative;
    z-index: 1;
    background-color: transparent;
    min-height: 100vh;
}

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

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

ul {
    list-style-position: inside;
    padding-left: 1rem;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    text-align: center;
    margin-bottom: 2.5rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* 导航栏 */
.navbar {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 1rem 0;
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    width: 24px;
    height: 24px;
    margin-right: 0.5rem;
    /* 移除fill属性，因为我们现在使用的是SVG图像文件 */
}

.logo-text {
    font-weight: 600;
    font-size: 1.25rem;
}

.navbar-nav {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--color-text);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
}

.nav-link:hover {
    color: var(--color-primary);
    text-decoration: none;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition);
}

.nav-link:hover::after {
    width: 100%;
}

.navbar-actions {
    display: flex;
    align-items: center;
}

/* 语言切换器 */
.language-switcher {
    position: relative;
}

.lang-dropdown {
    position: relative;
    display: inline-block;
}

.lang-dropdown-btn {
    display: flex;
    align-items: center;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    transition: var(--transition);
    gap: 6px;
}

.lang-dropdown-btn:hover {
    background-color: var(--color-bg-secondary);
}

.lang-icon {
    width: 16px;
    height: 16px;
    color: var(--color-text);
}

.dropdown-arrow {
    width: 12px;
    height: 12px;
    transition: transform 0.3s;
}

.lang-dropdown.active .dropdown-arrow {
    transform: rotate(180deg);
}

.current-lang {
    font-weight: 500;
}

.lang-dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background-color: var(--color-bg);
    min-width: 160px;
    box-shadow: 0 8px 16px var(--color-shadow);
    border-radius: var(--border-radius);
    z-index: 100;
    padding: 8px 0;
    margin-top: 5px;
    border: 1px solid var(--color-border);
}

.lang-dropdown.active .lang-dropdown-content {
    display: block;
}

.lang-option {
    display: block;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.875rem;
    padding: 8px 16px;
    transition: var(--transition);
}

.lang-option:hover {
    background-color: var(--color-bg-secondary);
}

.lang-option.active {
    background-color: var(--color-primary);
    color: white;
}

/* 响应式设计 - 语言切换器 */
@media (max-width: 768px) {
    .current-lang {
        display: none;
    }
    
    .lang-dropdown-btn {
        padding: 0.5rem;
    }
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    border: 1px solid var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    border-color: var(--color-primary-hover);
    color: white;
    text-decoration: none;
}

.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline:hover {
    background-color: var(--color-bg-secondary);
    text-decoration: none;
}

/* 英雄区域 */
.hero {
    padding: 4rem 0;
    background-color: rgba(250, 251, 252, 0.6);
    border-bottom: 1px solid var(--color-border);
}

.hero-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.hero-image {
    max-width: 450px;
    width: 100%;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 12px var(--color-shadow);
    transition: transform 0.3s ease;
}

.hero-image img:hover {
    transform: scale(1.02);
}

/* 特性区域 */
.features {
    padding: 5rem 0;
    background-color: rgba(255, 255, 255, 1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--color-shadow);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--color-text-secondary);
}

/* 下载区域 */
.download {
    padding: 5rem 0;
    background-color: rgba(246, 248, 250, 1);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.download-options {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.download-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    width: 100%;
    max-width: 350px;
    transition: var(--transition);
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--color-shadow);
}

.download-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1.5rem;
}

.windows-icon, .mobile-icon {
    width: 100%;
    height: 100%;
    fill: var(--color-primary);
}

.download-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.download-card p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

.download-btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--color-primary);
    color: white;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
}

.download-btn:hover {
    background-color: var(--color-primary-hover);
    color: white;
    text-decoration: none;
}

.mobile-buttons {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

.ios-btn, .android-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* 原理区域 */
.principles {
    padding: 5rem 0;
    background-color: rgba(255, 255, 255, 1);
}

.principles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.principle-card {
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.principle-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--color-shadow);
}

.principle-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.card-content {
    margin-bottom: 1.5rem;
    min-height: 100px;
}

.detail-link {
    display: inline-block;
    color: var(--color-primary);
    font-weight: 600;
}

.detail-link:hover {
    text-decoration: underline;
}

/* 团队区域 */
.team {
    padding: 5rem 0;
    background-color: rgba(246, 248, 250, 1);
    border-top: 1px solid var(--color-border);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.team-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    transition: var(--transition);
}

.team-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px var(--color-shadow);
}

.team-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.team-content {
    margin-bottom: 1.5rem;
    min-height: 100px;
}

/* 页脚 */
.footer {
    background-color: rgba(250, 251, 252, 1);
    border-top: 1px solid var(--color-border);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

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

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-link {
    color: var(--color-text-secondary);
}

.footer-link:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--color-border);
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero-container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        margin-bottom: 3rem;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .download-options {
        flex-direction: column;
        align-items: center;
    }
}

@media (max-width: 768px) {
    .navbar-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .navbar-nav {
        margin: 1rem 0;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 576px) {
    .features-grid,
    .principles-grid,
    .team-grid {
        grid-template-columns: 1fr;
    }
    
    .mobile-buttons {
        flex-direction: column;
        gap: 0.75rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-actions {
        flex-direction: column;
        gap: 1rem;
    }
}