* { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      background: linear-gradient(160deg, #e0f7fa 0%, #b3e5fc 40%, #81d4fa 100%);
      min-height: 100vh;
      color: #1a3a5c;
      overflow-x: hidden;
    }
    .page {
      max-width: 480px;
      margin: 0 auto;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      padding: 16px;
      position: relative;
    }
    /* 顶部logo和进度 */
    .header {
      text-align: center;
      padding: 12px 0 8px;
    }
    .logo {
      max-width: 220px;
      height: auto;
      margin: 0 auto 12px;
      display: block;
    }
    .progress-wrap {
      background: rgba(255,255,255,0.6);
      border-radius: 20px;
      height: 10px;
      overflow: hidden;
      margin: 8px 0 4px;
    }
    .progress-bar {
      height: 100%;
      background: linear-gradient(90deg, #0288d1, #00bcd4);
      border-radius: 20px;
      transition: width 0.4s ease;
      width: 0%;
    }
    .progress-text {
      font-size: 13px;
      color: #0277bd;
      text-align: right;
      margin-bottom: 8px;
    }
    /* 卡片 */
    .card {
      background: #fff;
      border-radius: 20px;
      padding: 28px 22px;
      box-shadow: 0 8px 30px rgba(2, 119, 189, 0.15);
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .question-title {
      font-size: 18px;
      font-weight: 600;
      line-height: 1.5;
      margin-bottom: 22px;
      color: #01579b;
    }
    .options {
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex: 1;
    }
    .option {
      background: #f0f9ff;
      border: 2px solid #e1f5fe;
      border-radius: 14px;
      padding: 14px 16px;
      font-size: 16px;
      cursor: pointer;
      transition: all 0.2s;
      display: flex;
      align-items: center;
      gap: 10px;
      user-select: none;
    }
    .option:hover { border-color: #4fc3f7; background: #e1f5fe; }
    .option.selected {
      border-color: #0288d1;
      background: #e1f5fe;
      color: #01579b;
      font-weight: 500;
    }
    .option input { display: none; }
    .check {
      width: 22px;
      height: 22px;
      border: 2px solid #90caf9;
      border-radius: 50%;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s;
    }
    .option.selected .check {
      background: #0288d1;
      border-color: #0288d1;
    }
    .option.selected .check::after {
      content: "✓";
      color: white;
      font-size: 14px;
      font-weight: bold;
    }
    textarea, input[type="text"] {
      width: 100%;
      border: 2px solid #e1f5fe;
      border-radius: 12px;
      padding: 14px;
      font-size: 16px;
      font-family: inherit;
      resize: none;
      background: #f0f9ff;
      color: #01579b;
      outline: none;
    }
    textarea:focus, input[type="text"]:focus {
      border-color: #0288d1;
    }
    .score-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 10px;
    }
    .score-btn {
      aspect-ratio: 1;
      border: 2px solid #e1f5fe;
      border-radius: 12px;
      background: #f0f9ff;
      font-size: 18px;
      font-weight: 600;
      color: #0277bd;
      cursor: pointer;
      transition: all 0.2s;
    }
    .score-btn.selected {
      background: #0288d1;
      border-color: #0288d1;
      color: white;
    }
    /* 按钮区 */
    .btn-area {
      margin-top: 24px;
      display: flex;
      gap: 12px;
    }
    .btn {
      flex: 1;
      border: none;
      border-radius: 14px;
      padding: 15px;
      font-size: 17px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
    }
    .btn-prev {
      background: #e3f2fd;
      color: #0277bd;
    }
    .btn-next, .btn-submit {
      background: linear-gradient(90deg, #0288d1, #00acc1);
      color: white;
      box-shadow: 0 4px 15px rgba(2, 136, 209, 0.35);
    }
    .btn:active { transform: scale(0.98); }
    .btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
      transform: none;
    }
    /* 成功页 */
    .success-page {
      display: none;
      text-align: center;
      padding: 20px 10px;
    }
    .success-icon {
      font-size: 64px;
      margin-bottom: 16px;
    }
    .success-title {
      font-size: 24px;
      font-weight: 700;
      color: #01579b;
      margin-bottom: 12px;
    }
    .success-desc {
      font-size: 16px;
      color: #0277bd;
      line-height: 1.6;
      margin-bottom: 28px;
    }
    .tg-btn {
      display: inline-block;
      background: linear-gradient(90deg, #0288d1, #00acc1);
      color: white;
      text-decoration: none;
      padding: 16px 36px;
      border-radius: 50px;
      font-size: 18px;
      font-weight: 600;
      box-shadow: 0 6px 20px rgba(2, 136, 209, 0.4);
    }
    .tg-tip {
      margin-top: 18px;
      font-size: 14px;
      color: #546e7a;
      line-height: 1.5;
    }
    /* 隐藏类 */
    .hidden { display: none !important; }
    /* PC端优化 */
    @media (min-width: 600px) {
      .page { padding: 30px 20px; }
      .card { padding: 36px 32px; }
      .question-title { font-size: 20px; }
    }

    .shake {
      animation: shake 0.4s ease-in-out;
    }
    @keyframes shake {
      0%, 100% { transform: translateX(0); }
      20% { transform: translateX(-6px); }
      40% { transform: translateX(6px); }
      60% { transform: translateX(-4px); }
      80% { transform: translateX(4px); }
    }
    textarea.error {
      border-color: #e53935 !important;
      background: #ffebee !important;
    }