/* ===== 下载界面统一样式 - 现代化设计 ===== */

/* CSS 变量定义 - 优化性能和兼容性 */
:root {
    /* 颜色系统 */
    --primary-color: #007BFF;
    --primary-hover: #0056b3;
    --secondary-color: #6c757d;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --danger-color: #dc3545;
    --info-color: #17a2b8;
    
    /* 主题颜色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
    
    /* 渐变背景 */
    --gradient-stable: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-beta: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-dev: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    /* 阴影系统 */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* 卡片样式 */
    --card-bg: rgba(255, 255, 255, 0.95);
    --card-border: rgba(255, 255, 255, 0.2);
    --card-shadow: var(--shadow-lg);
    
    /* 过渡动画 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    /* 间距 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
}

/* 基础样式设置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

/* 页面基础样式 */
body {
    background: var(--gradient-stable);
    background-size: 200% 200%;
    animation: gradientBG 25s ease infinite;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--text-primary);
    font-family: 'Segoe UI', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    will-change: background, color;
    transform: translateZ(0);
}

/* Beta 版本特定背景 */
body.beta-version {
    background: var(--gradient-beta);
}

/* Dev 版本特定背景 */
body.dev-version {
    background: var(--gradient-dev);
}

/* 背景动画 */
@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 容器布局 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* 页面头部样式 */
.page-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    text-align: center;
    animation: fadeInUp 1s ease;
}

.header-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(20px);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: white;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    animation: float 3s ease-in-out infinite;
}

.header-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.page-title {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    color: white;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    margin: 0;
}

.page-subtitle {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin: 0;
    font-weight: 400;
}

.version-badge {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}

.badge {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge.stable {
    background: var(--success-color);
    color: white;
}

.badge.beta {
    background: var(--warning-color);
    color: #212529;
}

.badge.dev {
    background: var(--danger-color);
    color: white;
}

.badge.version {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    backdrop-filter: blur(10px);
}

/* 版本卡片容器 */
.version-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-xl);
    width: 100%;
    max-width: 1000px;
    margin-bottom: var(--space-2xl);
}

/* 版本卡片样式 */
.version-card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--card-border);
    transition: all var(--transition-normal);
    will-change: transform, box-shadow, backdrop-filter;
    transform: translateZ(0);
    position: relative;
    overflow: hidden;
}

.version-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.version-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(30px);
}

.version-card:hover::before {
    left: 100%;
}

.version-card.stable {
    border-left: 6px solid var(--success-color);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 249, 250, 0.95) 100%);
}

.version-card.beta {
    border-left: 6px solid var(--warning-color);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 248, 225, 0.95) 100%);
}

.version-card.dev {
    border-left: 6px solid var(--danger-color);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 231, 231, 0.95) 100%);
}

.version-card-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--space-lg);
}

.version-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--space-md);
    font-size: 1.5rem;
    color: white;
}

.version-icon.stable {
    background: var(--success-color);
}

.version-icon.beta {
    background: var(--warning-color);
}

.version-icon.dev {
    background: var(--danger-color);
}

.version-card-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.version-card-subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* 下载列表样式 */
.download-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.download-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg) var(--space-xl);
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    will-change: transform, background-color, box-shadow;
    position: relative;
    overflow: hidden;
}

.download-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.download-item:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.15) 100%);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.download-item:hover::before {
    left: 100%;
}

.download-info {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.download-version {
    font-weight: 700;
    color: var(--text-primary);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.download-version::before {
    content: '📦';
    font-size: 1em;
}

.download-platform {
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.9;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.download-platform::before {
    content: '💻';
    font-size: 0.9em;
}

.download-button {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    border: none;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    display: inline-block;
    will-change: transform, background-color, box-shadow;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.2);
}

.download-button::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: left var(--transition-slow);
}

.download-button:hover {
    background: linear-gradient(135deg, var(--primary-hover) 0%, #004085 100%);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 123, 255, 0.4);
}

.download-button:hover::before {
    left: 100%;
}

.download-button:active {
    transform: translateY(-1px) scale(1.02);
    box-shadow: 0 2px 10px rgba(0, 123, 255, 0.3);
}

/* 导航按钮组 */
.nav-buttons {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
    flex-wrap: wrap;
    justify-content: center;
}

.nav-button {
    padding: var(--space-lg) var(--space-xl);
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    color: white;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-normal);
    backdrop-filter: blur(20px);
    will-change: transform, background-color, box-shadow;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.nav-button::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: left var(--transition-slow);
}

.nav-button:hover {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.15) 100%);
    border-color: rgba(255, 255, 255, 0.7);
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.nav-button:hover::before {
    left: 100%;
}

.nav-button.active {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.35) 0%, rgba(255, 255, 255, 0.25) 100%);
    border-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 6px 25px rgba(255, 255, 255, 0.2);
}

.nav-button i {
    font-size: 1.2em;
    transition: transform var(--transition-fast);
}

.nav-button:hover i {
    transform: scale(1.1);
}

/* 信息框样式 */
.info-box {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-top: var(--space-xl);
    border: 1px solid rgba(255, 255, 255, 0.2);
    max-width: 600px;
    text-align: center;
}

.info-text {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.95rem;
    line-height: 1.5;
    margin: 0;
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: var(--space-lg);
    }
    
    .version-grid {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }
    
    .version-card {
        padding: var(--space-lg);
    }
    
    .nav-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .nav-button {
        width: 100%;
        max-width: 300px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 2rem;
    }
    
    .page-subtitle {
        font-size: 1rem;
    }
    
    .version-card {
        padding: var(--space-md);
    }
    
    .download-item {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }
    
    .download-button {
        align-self: flex-end;
    }
}

/* 性能优化 */
* {
    transition: color var(--transition-normal),
                background-color var(--transition-normal),
                border-color var(--transition-normal),
                box-shadow var(--transition-normal);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.5);
}