/* ===== 电脑系统下载中心 - 整合版CSS ===== */
:root {
    /* 核心颜色变量 */
    --primary: #667eea;
    --secondary: #764ba2;
    --accent: #f093fb;
    --success: #4ecdc4;
    
    /* 文本颜色 */
    --text-dark: #2d3436;
    --text-light: #ffffff;
    --text-muted: #636e72;
    
    /* 背景 */
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.2);
    --group-bg: rgba(255, 255, 255, 0.95);
    
    /* 阴影 */
    --shadow-light: 0 4px 15px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 15px 35px rgba(0, 0, 0, 0.2);
    --shadow-colored: 0 8px 25px rgba(102, 126, 234, 0.3);
    
    /* 动画 */
    --transition: all 0.3s ease;
    --transition-fast: all 0.2s ease;
    
    /* 圆角和间距 */
    --radius: 16px;
    --radius-small: 12px;
    --radius-large: 20px;
    
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    background: var(--bg-gradient);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ===== 容器布局 ===== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* 清除默认样式冲突 */
.unit-100 {
    width: 100%;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.7s;
    opacity: 0;
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.language {
    text-align: center;
    margin: 0 auto;
    position: relative;
    background: var(--group-bg);
    border-radius: var(--radius-large);
    box-shadow: var(--shadow-medium);
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.3);
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* 背景装饰元素 */
.bg-decor {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
    animation: float 6s ease-in-out infinite;
    z-index: 0;
}

.bg-decor:nth-child(1) {
    top: -100px;
    left: -100px;
    animation-delay: 0s;
}

.bg-decor:nth-child(2) {
    bottom: -100px;
    right: -100px;
    animation-delay: 3s;
}

/* 头部样式 */
.header {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(15px);
    border-radius: var(--radius);
    box-shadow: var(--shadow-medium);
    animation: fadeInUp 0.6s ease-out forwards;
    opacity: 0;
    position: relative;
    z-index: 1;
}

.header h3 {
    font-size: 2.2rem;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(to right, #ffffff, #f0f0f0);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
    letter-spacing: 1px;
    font-weight: 700;
}

.header p {
    font-size: 1.1rem;
    color: var(--text-light);
    text-shadow: 0 1px 5px rgba(0, 0, 0, 0.3);
    margin-bottom: 0;
    opacity: 0.9;
}

/* 面包屑导航 */
.breadcrumb {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-light);
    font-size: 0.9rem;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.5s;
    opacity: 0;
}

.breadcrumb a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--accent);
    text-shadow: 0 0 10px rgba(240, 147, 251, 0.5);
}

.breadcrumb-separator {
    margin: 0 var(--spacing-sm);
    opacity: 0.7;
}

.breadcrumb-current {
    font-weight: 500;
    color: var(--accent);
}

/* 下载内容样式 */
.download-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.9s;
    opacity: 0;
}

.download-content p {
    font-size: 1.5rem;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    color: var(--primary);
    font-weight: bold;
    position: relative;
    display: inline-block;
    text-align: center;
    width: 100%;
}

.download-content p::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    border-radius: 3px;
}

/* 下载分组样式 */
.download-group {
    background: rgba(255,255,255,0.95);
    border-radius: var(--radius);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
    transition: var(--transition-fast);
}

.download-group::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 4px;
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    transition: var(--transition-fast);
}

.download-group:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.download-group li {
    margin-bottom: 10px;
    padding: 8px 12px;
    transition: var(--transition-fast);
    border-radius: var(--radius-small);
    list-style: none;
}

.download-group li:hover {
    transform: translateY(-2px);
    background: rgba(102, 126, 234, 0.05);
    border-left-color: var(--primary);
}

/* 按钮样式系统 */
.btn2 {
    display: inline-block;
    padding: 10px 20px;
    margin: 4px;
    border-radius: var(--radius-small);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    line-height: 1.4;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn2::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition);
}

.btn2:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-colored);
}

.btn2:hover::before {
    left: 100%;
}

/* 按钮类型变体 */
.btn-windows {
    background: linear-gradient(45deg, #0078d4, #106ebe);
    color: white;
}

.btn-office {
    background: linear-gradient(45deg, #d83b01, #ff8c00);
    color: white;
}

.btn-tools {
    background: linear-gradient(45deg, #e91e63, #ad1457);
    color: white;
}

.btn-software {
    background: linear-gradient(45deg, #00b894, #00a085);
    color: white;
}

/* 图片容器样式 */
.image-container {
    margin: var(--spacing-xl) 0;
    text-align: center;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 1.1s;
    opacity: 0;
}

.download-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
    box-shadow: var(--shadow-medium);
    transition: var(--transition);
    max-height: 500px;
    object-fit: contain;
}

.download-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-heavy);
}

/* 页脚样式 */
.footer {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: rgba(255,255,255,0.1);
    border-radius: var(--radius);
    color: var(--text-light);
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 1.3s;
    opacity: 0;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.footer p {
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

.footer p:nth-child(2) {
    margin-top: var(--spacing-sm);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 下载建议列表样式 */
.download-group ul {
    list-style: none;
    padding-left: 0;
    text-align: left;
    max-width: 600px;
    margin: 0 auto;
}

.download-group ul li {
    margin-bottom: 12px;
    padding-left: 20px;
    position: relative;
    line-height: 1.6;
}

.download-group ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    top: 3px;
    color: var(--accent);
    font-size: 1.2rem;
    font-weight: bold;
}

/* 下载说明样式 */
.download-description {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.95rem;
    animation: fadeInUp 0.8s ease-out forwards;
    animation-delay: 0.8s;
    opacity: 0;
}

/* 动画定义 */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

@keyframes textGlow {
    0% { text-shadow: 0 0 5px rgba(240, 147, 251, 0.5); }
    50% { text-shadow: 0 0 20px rgba(240, 147, 251, 0.8), 0 0 30px rgba(240, 147, 251, 0.5); }
    100% { text-shadow: 0 0 5px rgba(240, 147, 251, 0.5); }
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(1); opacity: 0.8; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .container {
        max-width: 100%;
        padding: var(--spacing-md);
    }
    
    .header h3 {
        font-size: 2rem;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-xl: 1.5rem;
        --spacing-lg: 1.25rem;
        --spacing-md: 0.75rem;
        --spacing-sm: 0.5rem;
    }
    
    .header h3 {
        font-size: 1.8rem;
    }
    
    .download-content p {
        font-size: 1.2rem;
    }
    
    .btn2 {
        font-size: 13px;
        padding: 8px 16px;
        margin: 3px;
        display: inline-block;
        width: auto;
    }
    
    .language {
        padding: var(--spacing-lg);
    }
    
    .footer {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .header {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .header h3 {
        font-size: 1.6rem;
    }
    
    .btn2 {
        display: block;
        width: 80%;
        margin: 8px auto;
    }
    
    .download-group {
        padding: var(--spacing-md);
    }
    
    .download-group ul {
        text-align: center;
    }
    
    .download-group ul li {
        padding-left: 0;
    }
    
    .download-group ul li::before {
        left: auto;
        right: 100%;
        margin-right: var(--spacing-sm);
    }
}

/* 无障碍和焦点样式 */
:focus {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--radius-small);
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(to bottom, var(--primary), var(--secondary));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(to bottom, var(--secondary), var(--primary));
}

/* 从其他文件整合的额外样式 */
.coin {
    position: fixed;
    top: -9999px;
    left: -9999px;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}