body {
      font-family: "Hiragino Sans", "Noto Sans JP", sans-serif;
      background-color: #f8fafc;
      color: #333;
      margin: 0;
      padding: 0;
      line-height: 1.7;
    }
    header {
      background: linear-gradient(to right, #4f8ef7, #6ab0de);
      color: #fff;
      text-align: center;
      padding: 35px 15px;
    }
    header h1 {
      font-size: 1.6em;
      margin-bottom: 8px;
    }
    header p {
      font-size: 1em;
      opacity: 0.9;
      margin: 0;
    }
    main {
      max-width: 850px;
      margin: 20px auto;
      padding: 10px 15px;
      background: #fff;
      border-radius: 8px;
      box-shadow: 0 2px 6px rgba(0,0,0,0.05);
    }
    .profile-avatar {
      text-align: center;
      margin: 15px 0;
    }
    .profile-avatar img {
      width: 90px;
      height: 90px;
      border-radius: 50%;
      object-fit: cover;
      box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    }
    .content-block {
      margin-bottom: 18px;
    }
    .content-block p {
      margin: 6px 0;
      text-align: justify;
    }
    .cta {
      text-align: center;
      margin-top: 25px;
    }
    .cta button {
      background: linear-gradient(to right, #3b82f6, #60a5fa);
      border: none;
      padding: 12px 28px;
      font-size: 1em;
      color: #fff;
      border-radius: 40px;
      cursor: pointer;
      transition: 0.3s;
    }
    .cta button:hover {
      background: linear-gradient(to right, #2563eb, #3b82f6);
      transform: translateY(-1px);
    }
    footer {
      text-align: center;
      font-size: 0.85em;
      color: #666;
      margin: 20px 0;
    }
    footer a {
      color: #2563eb;
      text-decoration: none;
      margin: 0 8px;
    }
    .banner-container img {
      width: 100%;
      border-radius: 8px;
      margin-top: 10px;
    }
    /* ✅ 弹窗样式 */
    .popup {
      display: none;
      position: fixed;
      z-index: 1000;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.5);
    }
    .popup-body {
      background: #fff;
      max-width: 680px;
      margin: 80px auto;
      border-radius: 10px;
      padding: 30px;
      position: relative;
      box-shadow: 0 3px 15px rgba(0,0,0,0.3);
      animation: popup-in 0.25s ease;
    }
    .popup-close {
      position: absolute;
      top: 10px;
      right: 20px;
      font-size: 22px;
      cursor: pointer;
    }
    @keyframes popup-in {
      from { transform: scale(0.9); opacity: 0; }
      to { transform: scale(1); opacity: 1; }
    }