/* 全站背景：較亮的漸變色系 */
body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(-45deg, #283048, #4b79a1, #a8c0ff, #e0eafc);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    color: #333;
    text-align: center;
    margin: 0;
    padding: 0;
    /* 移除文字陰影以避免模糊 */
    /* text-shadow: none; */
  }
  
  /* 漸變動畫 keyframes */
  @keyframes gradientBG {
    0% {
      background-position: 0% 50%;
    }
    50% {
      background-position: 100% 50%;
    }
    100% {
      background-position: 0% 50%;
    }
  }
  
  /* particles.js 區塊（如啟用背景動畫） */
  #particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: -1;
    top: 0;
    left: 0;
  }
  
  /* 頁首區 */
  .header-section {
    background: linear-gradient(90deg, #ff416c, #ff4b2b);
    padding: 60px 0;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.3);
  }
  .header-section h1 {
    font-size: 3rem;
    margin: 0;
    color: #fff;
  }
  .header-section p {
    font-size: 1.25rem;
    color: #fff;
  }
  
  /* 主要內容區：採用較淺背景與深色文字，確保內文清晰 */
  .main-content {
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: 15px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin-top: 30px;
    color: #333;
  }
  .main-content h2,
  .main-content p,
  .main-content li,
  .main-content a {
    color: #333;
  }
  
  /* 個人頭像 */
  .profile-img {
    width: 150px;
    border-radius: 50%;
    box-shadow: 0 4px 15px rgba(255, 75, 43, 0.6);
    transition: transform 0.3s ease-in-out;
  }
  .profile-img:hover {
    transform: scale(1.1);
  }
  
  /* 自訂按鈕 */

  /* 移除按鈕群組及其按鈕的邊框、outline 與聚焦時的 box-shadow */
  .btn-group {
    border: none;
  }

  .btn-group .btn {
    border: none !important;
    outline: none !important;
    box-shadow: none !important;
  }

  /* 針對焦點狀態也清除外框 */
  .btn-group .btn:focus {
    outline: none !important;
    box-shadow: none !important;
  }

  /* 若因為 inline 元素間的空白產生縫隙，可以試試以下做法（選用）：
    將 .btn-group 設定為 flex 布局 */
  .btn-group {
    display: flex;
  }

  .btn-primary-custom {
    background: linear-gradient(90deg, #00c6ff, #0072ff);
    border: none;
    color: #fff;
  }
  .btn-primary-custom:hover {
    background: linear-gradient(90deg, #0072ff, #00c6ff);
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(0, 114, 255, 0.5);
  }
  .btn-secondary-custom {
    background: linear-gradient(90deg, #ff416c, #ff4b2b);
    border: none;
    color: #fff;
  }
  .btn-secondary-custom:hover {
    background: linear-gradient(90deg, #ff4b2b, #ff416c);
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(255, 75, 43, 0.5);
  }
  .btn-minecraft {
    background: linear-gradient(90deg, #a1c4fd, #c2e9fb); /* 較淺的藍色漸層 */
    border: none;
    color: #fff;
    transition: all 0.3s ease;
  }
  .btn-minecraft:hover {
    background: linear-gradient(90deg, #c2e9fb, #a1c4fd);
    transform: scale(1.1);
    box-shadow: 0 6px 20px rgba(194, 233, 251, 0.5);
  }
  
  /* 卡片區塊 */
  .card {
    background: rgba(0, 0, 0, 0.2);
    color: #fff;
    border: none;
    transition: transform 0.3s ease-in-out;
  }
  .card:hover {
    transform: scale(1.05);
  }
  
  /* Footer 區塊 */
  .footer-section {
    background: #222;
    padding: 20px 0;
    margin-top: 30px;
  }
  .footer-section p {
    margin: 0;
    color: #fff;
  }
  
  /* 強調技能區塊 */
  .skills-section h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
  }
  .skills-section h2::after {
    content: "";
    position: absolute;
    width: 50%;
    height: 3px;
    background: linear-gradient(90deg, #00c6ff, #0072ff);
    left: 25%;
    bottom: -10px;
  }
  .skills-section .badge {
    font-size: 1.2rem;
    padding: 10px 15px;
    margin: 5px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }
  .skills-section .badge:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.5);
  }
  
  /* 響應式調整 */
  @media (max-width: 768px) {
    .header-section h1 {
      font-size: 2.5rem;
    }
    .header-section p {
      font-size: 1rem;
    }
  }