/* 1. 主题色和阴影变量 */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f5f6fa;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --modal-header-height: 56px;
  }
  
  /* 2. 全局重置 */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  /* 3. 正文背景和字体 */
  body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-bg);
  }
  
  /* 4. 头部导航 */
  .navbar {
    background-color: var(--primary-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
  }
  .logo h1 {
    color: var(--white);
    font-size: 1.8rem;
  }
  .search-container {
    display: flex;
    gap: 0.5rem;
  }
  #searchInput {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    width: 300px;
  }
  .search-btn {
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
  }
  .search-btn:hover {
    background-color: #2980b9;
  }
  
  /* 5. 分类过滤区域 */
  .category-filter {
    padding: 1rem 2rem;
    background-color: var(--white);
    box-shadow: var(--shadow);
  }
  .categories {
    display: flex;
    gap: 1rem;
    overflow-x: auto;
    padding: 0.5rem 0;
  }
  .category-btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--secondary-color);
    border-radius: 20px;
    background: none;
    color: var(--secondary-color);
    cursor: pointer;
    transition: all 0.3s;
  }
  .category-btn:hover,
  .category-btn.active {
    background-color: var(--secondary-color);
    color: var(--white);
  }
  
  /* 6. 游戏卡片列表 */
  .game-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem;
  }
  .game-card {
    background-color: var(--white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
  }
  .game-card:hover {
    transform: translateY(-5px);
  }
  .game-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
  }
  .game-info {
    padding: 1rem;
  }
  .game-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
  }
  .game-description {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 1rem;
  }
  .play-btn {
    background-color: var(--secondary-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s;
  }
  .play-btn:hover {
    background-color: #2980b9;
  }
  
  /* 7. 底部 */
  footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 2rem;
    margin-top: 2rem;
  }
  .footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
  }
  .social-links {
    display: flex;
    gap: 1rem;
  }
  .social-links a {
    color: var(--white);
    font-size: 1.5rem;
    transition: color 0.3s;
  }
  .social-links a:hover {
    color: var(--secondary-color);
  }
  
  /* 8. 模态框及加载动画 */
  .game-modal {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background-color: rgba(0,0,0,0.9);
    z-index: 1000;
    overflow: auto;
  }
  .modal-content {
    position: relative;
    background-color: var(--white);
    margin: 0.5rem auto;
    width: 98%; max-width: 1600px; height: 95vh;
    border-radius: 8px;
    overflow: hidden;
    display: flex; flex-direction: column;
  }
  .modal-header {
    flex-shrink: 0;
    display: flex; justify-content: space-between; align-items: center;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: var(--white);
  }
  .close-btn {
    background: none; border: none;
    color: var(--white); font-size: 1.5rem;
    cursor: pointer;
  }
  .game-frame-wrapper {
    position: relative; flex-grow: 1;
    display: flex; justify-content: center; align-items: center;
    background-color: #000; min-height: 85vh; overflow: hidden;
  }
  .game-frame-container {
    position: relative; width: 100%; height: 100%; background-color: #000; overflow: hidden;
  }
  .game-frame-container iframe {
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%; border: none; display: block;
  }
  
  /* 加载指示器 & 错误信息 */
  .loading-spinner {
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    background: #000; color: #fff;
    font-size: 1.5rem; font-weight: bold; z-index: 10;
  }
  .loading-spinner::after {
    content: '';
    display: block;
    width: 50px; height: 50px; margin: 20px auto;
    border-radius: 50%;
    border: 5px solid var(--secondary-color);
    border-top-color: transparent;
    animation: spin 1s linear infinite;
  }
  @keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }
  .error-message {
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    display: flex; justify-content: center; align-items: center;
    background: #000; color: #fff; padding: 2rem; text-align: center;
    font-size: 1.2rem;
  }
  
  /* 移动端响应 */
  @media (max-width: 768px) {
    .navbar { flex-direction: column; gap: 1rem; }
    #searchInput { width: 100%; }
    .game-container { grid-template-columns: 1fr; padding: 1rem; }
    .footer-content { flex-direction: column; text-align: center; gap: 1rem; }
    .modal-content { width: 100%; height: 100%; margin: 0; border-radius: 0; }
    .game-frame-wrapper { min-height: calc(100vh - 50px); }
  }

    /* 9. game3 全屏样式 */
    .modal-content.fullscreen {
    /* 覆盖原来的尺寸限制 */
    width: 100vw !important;
    height: 100vh !important;
    max-width: none !important;
    margin: 0 !important;
    border-radius: 0 !important;
  }
  .modal-content.fullscreen .modal-header {
    /* 放大标题栏宽度 */
    width: 100%;
  }
  .modal-content.fullscreen .game-frame-wrapper {
    /* 让游戏区域撑满剩下的所有空间 */
    flex: none;
    height: calc(100% - var(--modal-header-height, 50px));
    min-height: 0;
  }
  .modal-content.fullscreen .game-frame-container,
  .modal-content.fullscreen .game-frame-container iframe {
    /* 扩展到容器 100% */
    width: 100%;
    height: 100%;
  }