/* 基础样式重置和变量定义 */
:root {
    /* 颜色变量 */
    --color-primary: #625ee4;
    --color-primary-light: #7a77e8;
    --color-primary-dark: #4a47d0;
    --color-secondary: #625ee4;
    --color-secondary-light: #7a77e8;
    --color-secondary-dark: #4a47d0;
    --color-text: #1a202c;
    --color-text-light: #4a5568;
    --color-background: #f0f2f5;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    --color-border: rgba(0, 0, 0, 0.1);
    
    /* 阴影变量 */
    --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);
    
    /* 间距变量 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* 圆角变量 */
    --border-radius: 8px;
    --border-radius-sm: 4px;
    --border-radius-lg: 12px;
    
    /* 动画变量 */
    --transition-normal: 0.3s ease;
    --transition-fast: 0.15s ease;
    --transition-slow: 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--color-gray-800);
    background: var(--color-gray-100);
}

/* 通用容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 下载进度条 */
.download-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--color-gray-200);
    display: none;
    z-index: 1000;
}

.download-progress-bar {
    height: 100%;
    background: var(--color-primary);
    width: 0;
    transition: width var(--transition-normal);
}

/* 头部导航 */
.header {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 60px;
    position: relative;
}

.nav-link {
    color: var(--color-gray-700);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: 0 var(--spacing-sm);
    position: relative;
    transition: color var(--transition-normal);
}

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

.nav-indicator {
    position: absolute;
    bottom: 0;
    height: 3px;
    background: var(--color-primary);
    transition: all var(--transition-normal);
    border-radius: var(--border-radius-sm);
}

/* 主要内容区 */
.main {
    padding: var(--spacing-xl) 0;
}

/* 英雄区域 */
.hero {
    text-align: center;
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-xxl);
}

.hero-title {
    font-size: 2.5rem;
    color: var(--color-white);
    margin-bottom: var(--spacing-xl);
}

.hero-title a {
    color: inherit;
    text-decoration: none;
}

.hero-subtitle {
    display: block;
    font-size: 1.2rem;
    margin-top: var(--spacing-sm);
    opacity: 0.9;
}

.download-section {
    margin-top: var(--spacing-xl);
}

.download-button {
    background: var(--color-white);
    color: var(--color-primary);
    border: none;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.download-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.download-button:active {
    transform: translateY(0);
}

/* 游戏截图展示区 */
.screenshots {
    padding: var(--spacing-xl) 0;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.screenshot-item {
    position: relative;
    width: 100%;
    height: 0;
    padding-bottom: 75%;
    overflow: hidden;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: transform 0.3s ease;
}

.screenshot-item:hover {
    transform: scale(1.02);
}

.screenshot-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

/* 模态框样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.modal.active {
    display: flex;
    opacity: 1;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90vh;
}

.modal-image {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--border-radius);
}

.modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: 2rem;
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: transform 0.3s ease;
}

.modal-close:hover {
    transform: scale(1.1);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    right: var(--spacing-xl);
    bottom: var(--spacing-xl);
    background: var(--color-white);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .download-button {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 1rem;
    }

    .screenshots-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .screenshot-item {
        padding-bottom: 56.25%; /* 16:9 比例 */
    }
}

/* 页脚 */
.footer {
    background: var(--color-white);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xxl);
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.footer-content {
    text-align: center;
    color: var(--color-gray-600);
}

.copyright {
    margin-bottom: var(--spacing-sm);
}

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

.contact a:hover {
    text-decoration: underline;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main {
    animation: fadeInUp 0.6s ease-out;
}