/* Reset & 基础 */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  html, body {
    width: 100%;
    height: 100%;
    font-size: 18px;
    background: #f2f2f7;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
    color: #1c1c1e;
    line-height: 1.6;
    box-sizing: border-box;
  }
  
  /* 标题 */
  h1, h2, h3 {
    font-weight: 600;
    margin-bottom: 0.5em;
  }
  
  /* 事件列表 - 默认多列grid */
  #event-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
  }
  
  /* 单个活动卡片 */
  .event-card {
    background: #fff;
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: box-shadow 0.2s ease-in-out;
    width: 100%;
    margin: 0;
  }
  
  .event-card:hover {
    box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  }
  
  .event-card img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    border-bottom: 1px solid #ddd;
  }
  
  .event-info {
    padding: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
  }
  
  .event-info h3 {
    font-size: 1.25rem;
    margin: 0 0 0.5em 0;
  }
  
  .event-info p {
    flex-grow: 1;
    font-size: 1rem;
    color: #3c3c4399;
    margin-bottom: 1em;
  }
  
  /* 按钮样式 */
  button {
    background-color: #007aff;
    border: none;
    color: white;
    padding: 0.85em 1.4em;
    font-size: 1.3rem;
    font-weight: 600;
    border-radius: 12px;
    cursor: pointer;
    transition: background-color 0.25s ease;
    user-select: none;
    outline-offset: 2px;
  }
  
  button:focus {
    outline: 2px solid #0051a8;
    outline-offset: 3px;
  }
  
  button:hover {
    background-color: #005ecb;
  }
  
  button:active {
    background-color: #0041a8;
  }
  
  /* 内容区 */
  #content {
    background: #fff;
    border-radius: 15px;
    padding: 1rem 1rem;
    max-width: 100%;
    margin: 1rem 0;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  }
  
  #content img {
    max-width: 100%;
    border-radius: 12px;
    margin: 1em 0;
  }
  
  /* 状态和按钮容器 */
  #status {
    font-size: 1.1rem;
    margin: 1rem 0;
    color: #555;
  }
  
  #buttons {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    flex-wrap: wrap;
  }
  
  #buttons button {
    flex: 1 1 120px;
    min-width: 120px;
    padding: 0.9em 0;
    font-size: 1.2rem;
  }
  
  /* 表单样式 */
  form {
    max-width: 100%;
    margin: 1rem auto 3rem auto;
    background: #fff;
    padding: 1.5rem 1rem;
    border-radius: 15px;
    box-shadow: 0 6px 20px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
  }
  
  label {
    display: flex;
    flex-direction: column;
    font-weight: 600;
    color: #333;
    font-size: 1.1rem;
  }
  
  input, select, textarea {
    margin-top: 0.3rem;
    padding: 0.75em 1em;
    font-size: 1.1rem;
    border: 1.5px solid #ccc;
    border-radius: 10px;
    font-family: inherit;
    transition: border-color 0.3s ease;
  }
  
  input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #007aff;
    box-shadow: 0 0 5px rgba(0,122,255,0.5);
  }
  
  textarea {
    resize: vertical;
    min-height: 80px;
  }
  
  button[type="submit"] {
    align-self: stretch;
    margin-top: 1rem;
    background-color: #007aff;
    padding: 1.3em 0;
    font-size: 1.4rem;
    font-weight: 700;
    border-radius: 15px;
  }
  
  /* 提示文字 */
  #result {
    max-width: 480px;
    margin: 0 auto 2rem auto;
    font-size: 1.1rem;
    color: #444;
    text-align: center;
  }
  
  /* loading遮罩 */
  #loadingMask {
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", Helvetica, Arial, sans-serif;
  }
  
  /* 移动端强制单列卡片 */
  @media screen and (max-width: 600px) {
    #event-list {
      display: grid !important;
      grid-template-columns: 1fr !important; /* 绝对单列 */
      gap: 1rem !important;
    }
  
    .event-card {
      width: 100% !important;
      display: block !important;
      margin: 0 auto 1rem auto !important;
    }
  
    #buttons {
      flex-direction: column !important;
      gap: 1rem !important;
    }
  
    #buttons button {
      width: 100% !important;
      min-width: auto !important;
    }
  
    button, button[type="submit"] {
      font-size: 1.6rem !important;
      padding: 1.5em 0 !important;
      border-radius: 20px !important;
    }
  }