/* ============ 页面加载遮罩 ============ */
    #page-loader {
      position: fixed;
      inset: 0;
      background: #020617;            /* 深色，和 footer 统一 */
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      z-index: 999999;
      color: #e5e7eb;
    }
    .loader-inner {
      text-align: center;
    }
    .loader-spinner {
      width: 64px;
      height: 64px;
      border-radius: 999px;
      border: 4px solid rgba(148,163,184,0.4);
      border-top-color: #38bdf8;
      animation: loaderSpin 0.9s linear infinite;
      margin: 0 auto 16px;
    }
    .loader-text-cn {
      font-size: 16px;
      letter-spacing: 0.2em;
      margin-bottom: 4px;
    }
    .loader-text-en {
      font-size: 12px;
      color: #9ca3af;
    }
    @keyframes loaderSpin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    /* 主内容初始隐藏，加载完成后再淡入 */
    #app.app-hidden {
      opacity: 0;
      visibility: hidden;
    }

    /* 顶部左侧文字：默认透明，动画时再显示（用 animate.css 的 fadeInUp） */
    .text-main-switch .text-line {
      opacity: 0;
    }
    .text-main-switch .text-line.animate-start {
      opacity: 1;
    }

    /* 左下角文字：竖向“滚动”滑入 */
    .left-font .left-font-line {
      opacity: 0;
      transform: translateY(20px);
    }
    .left-font .left-font-line.scroll-animate {
      animation: leftScrollIn 0.45s ease forwards;
    }

    @keyframes leftScrollIn {
      0% {
        opacity: 0;
        transform: translateY(20px);
      }
      100% {
        opacity: 1;
        transform: translateY(0);
      }
    }

    /* 右下角缩略图：淡入 */
    #paper-thumb {
      opacity: 0;
    }
    #paper-thumb.fade-animate {
      animation: thumbFadeIn 0.6s ease forwards;
    }

    @keyframes thumbFadeIn {
      0% { opacity: 0; }
      100% { opacity: 1; }
    }

    /* 中部介绍区域基础风格（偏学术、干净） */
    .intro-section {
      margin-top: 60px;
      margin-bottom: 40px;
    }
    .intro-section h2 {
      font-size: 28px;
      font-weight: 600;
      margin-bottom: 16px;
    }
    .intro-section p {
      font-size: 15px;
      line-height: 1.8;
    }

    .feature-section {
      padding: 60px 0;
      border-radius: 32px;
      margin-bottom: 40px;
    }
    .feature-card {
      background: #ffffff;
      border-radius: 20px;
      padding: 24px 22px;
      height: 100%;
      box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
      border: 1px solid rgba(148, 163, 184, 0.2);
    }
    .feature-card h5 {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px;
      color: #4b5563;
      line-height: 1.7;
    }

    .stats-section {
      padding: 40px 0 10px;
    }
    .stat-item h3 {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .stat-item p {
      font-size: 13px;
      color: #6b7280;
      margin-bottom: 0;
    }

    .news-section {
      padding: 40px 0 10px;
      border-top: 1px solid rgba(148,163,184,0.25);
    }
    .news-item {
      padding: 14px 0;
      border-bottom: 1px dashed rgba(148,163,184,0.35);
    }
    .news-item:last-child {
      border-bottom: none;
    }
    .news-date {
      font-size: 12px;
      color: #9ca3af;
    }
    .news-title {
      font-size: 14px;
      font-weight: 500;
      margin-bottom: 4px;
    }
    .news-desc {
      font-size: 13px;
      color: #6b7280;
      margin-bottom: 0;
    }

    /* 页脚 */
    .footer-miao {
      background: #020617;
      color: #e5e7eb;
      font-size: 13px;
    }
    .footer-miao a {
      color: #9ca3af;
      text-decoration: none;
    }
    .footer-miao a:hover {
      color: #e5e7eb;
      text-decoration: underline;
    }
    .footer-title {
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .footer-miao ul {
      list-style: none;
      padding: 0;
      margin: 0;
    }
    .footer-miao li {
      margin-bottom: 6px;
    }
    .footer-bottom {
      border-top: 1px solid rgba(148,163,184,0.3);
      margin-top: 24px;
      padding-top: 14px;
      font-size: 12px;
      color: #6b7280;
    }