:root {
      --page-bg: #f4f8fb;
      --surface: #ffffff;
      --surface-soft: #f8fbfd;
      --text-main: #111111;
      --text-muted: #333333;
      --line: #dbe7f0;
      --primary: #1d72b8;
      --primary-hover: #0f5f9f;
      --accent: #b36a55;
      --accent-soft: #fff6f2;
    }

    body {
      font-family: 'Open Sans', sans-serif;
      padding: 2rem 1rem;
      background:
        linear-gradient(180deg, #f7fbff 0%, var(--page-bg) 280px),
        var(--page-bg);
      color: var(--text-main);
      line-height: 1.62;
    }

    a {
      text-decoration: none !important;
      color: var(--primary);
      transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease;
    }
    
    a:hover {
      color: var(--primary-hover);
    }
    
    .custom-container {
      max-width: 1200px;
      margin: 0 auto;
      background-color: rgba(255, 255, 255, 0.96);
      padding: 2.25rem;
      border: 1px solid rgba(219, 231, 240, 0.9);
      border-radius: 12px;
      box-shadow: 0 18px 45px rgba(30, 72, 116, 0.08);
    }
    
    .header-container {
      display: flex;
      flex-direction: row;
      align-items: center;
      justify-content: center;
      padding: 1rem 0;
      gap: 2rem;
    }
    
    .profile-info {
      text-align: left;
      color: var(--text-main);
    }

    .profile-info .text-muted {
      color: var(--text-muted) !important;
    }
    
    .profile-img {
      width: 160px;
      height: 160px;
      object-fit: cover;
      border: none;
      background: transparent;
      border-radius: 0;
      display: block;
      box-shadow: none;
    }
    
    .nav-tabs {
      justify-content: center;
      border-bottom: 1px solid var(--line);
      margin-top: 1.5rem;
      gap: 0.25rem;
    }
    
    .nav-tabs .nav-link {
      border: none;
      color: var(--text-muted);
      padding: 0.58rem 1.2rem;
      border-radius: 8px 8px 0 0;
      transition: all 0.2s ease;
    }
    
    .nav-tabs .nav-link:hover {
      color: var(--primary-hover);
      background-color: #eef7fc;
    }
    
    .nav-tabs .nav-link.active {
      color: var(--primary-hover);
      background-color: #f7fbff;
      border-bottom: 3px solid var(--accent);
      font-weight: bold;
    }
    
    .tab-content {
      padding: 2rem 0;
    }
    
    .tab-pane {
      padding: 0 1rem;
    }
    
    ul {
      padding-left: 1.5rem;
    }
    
    li {
      margin-bottom: 0.5rem;
    }
    
    h2, h5 {
      color: var(--text-main);
      font-weight: 600;
    }

    .section-title {
      color: var(--accent);
      font-size: 1.52rem;
      font-weight: 700;
      line-height: 1.2;
      margin: 2.2rem 0 1.55rem;
      letter-spacing: 0;
      clear: both;
      display: block;
    }

    .section-title:first-child {
      margin-top: 0;
    }

    .section-title::after {
      content: "";
      display: block;
      width: 150px;
      height: 2px;
      margin-top: 0.85rem;
      background: linear-gradient(90deg, var(--accent), rgba(179, 106, 85, 0.16));
    }
    
    .bg-light-red {
      background-color: #FFF5F5;
    }
    
    .border-red {
      border: 1px solid #FFCCCB;
      border-radius: 5px;
    }
    
    .placeholder-text {
      color: var(--text-muted);
      font-style: normal;
    }

    .timeline-list,
    .education-list {
      display: grid;
      gap: 1.7rem;
      margin: 0 0 2rem;
    }

    .timeline-list {
      position: relative;
      padding-left: 0.15rem;
    }

    .timeline-list::before {
      content: "";
      position: absolute;
      top: 1.8rem;
      bottom: 1.8rem;
      left: 1.52rem;
      width: 2px;
      background: linear-gradient(180deg, rgba(179, 106, 85, 0.18), rgba(179, 106, 85, 0.65), rgba(179, 106, 85, 0.18));
    }

    .timeline-item,
    .education-item {
      display: grid;
      grid-template-columns: 7rem 1fr;
      gap: 1.55rem;
      align-items: start;
      position: relative;
    }

    .timeline-item::before {
      content: "";
      position: absolute;
      top: 1.72rem;
      left: 1.29rem;
      width: 0.45rem;
      height: 0.45rem;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 0 5px #ffffff;
      z-index: 1;
    }

    .timeline-logo {
      justify-self: end;
      position: relative;
      width: 4.15rem;
      height: 4.15rem;
      margin-top: 0;
      border-radius: 0;
      background: transparent;
      border: none;
      box-shadow: none;
      z-index: 2;
      overflow: visible;
    }

    .timeline-logo img {
      position: relative;
      z-index: 4;
      display: block;
      width: 100%;
      height: 100%;
      object-fit: contain;
      padding: 0;
      background: transparent;
    }

    .timeline-logo.logo-sdu img {
      transform: scale(1.16);
    }

    .timeline-logo::before {
      content: "";
      position: absolute;
      left: 50%;
      top: 50%;
      width: 1.86rem;
      height: 2.12rem;
      transform: translate(-50%, -50%);
      background: linear-gradient(180deg, #cb8065 0%, #a75d49 100%);
      clip-path: polygon(50% 0, 92% 16%, 84% 70%, 50% 100%, 16% 70%, 8% 16%);
      box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.18);
    }

    .timeline-logo::after {
      content: "";
      position: absolute;
      left: 50%;
      top: 50%;
      width: 1rem;
      height: 1rem;
      transform: translate(-50%, -52%);
      background:
        linear-gradient(#ffffff, #ffffff) center / 0.22rem 1rem no-repeat,
        linear-gradient(#ffffff, #ffffff) center / 1rem 0.22rem no-repeat;
      z-index: 3;
    }

    .timeline-logo:has(img)::before,
    .timeline-logo:has(img)::after {
      display: none;
    }

    .timeline-content {
      min-width: 0;
      padding: 0.05rem 0 0;
    }

    .timeline-title {
      color: var(--text-main);
      font-size: 1.08rem;
      font-weight: 700;
      line-height: 1.35;
    }

    .timeline-title a {
      color: var(--text-main);
    }

    .timeline-role {
      color: #333333;
      font-size: 1rem;
      margin-top: 0.18rem;
    }

    .timeline-meta {
      color: #4a4a4a;
      font-size: 0.96rem;
      margin-top: 0.18rem;
      }

    .timeline-date {
      color: var(--accent);
      font-weight: 700;
      margin-top: 0.26rem;
    }

    .paper-item {
      display: flex;
      gap: 1.1rem;
      margin-bottom: 1rem;
      padding: 0.95rem 1rem;
      border: 1px solid transparent;
      border-radius: 8px;
      background: transparent;
      transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .paper-item:hover {
      background: var(--surface-soft);
      border-color: #e2edf5;
      box-shadow: 0 8px 22px rgba(30, 72, 116, 0.06);
    }
        
    .conference {
      width: 150px;
      font-weight: bold;
      color: var(--accent);
      line-height: 1.35;
    }
        
    .paper-details {
      flex: 1;
      color: var(--text-main);
    }

    .paper-details i {
      color: #333333;
    }

    hr {
      border: 0;
      border-top: 1px solid var(--line);
      opacity: 1;
      margin: 0.7rem 0 1.1rem;
    }

    .bibtex-box {
      background: var(--surface-soft);
      border: 1px solid var(--line);
      border-radius: 8px;
      padding: 12px;
      font-family: "Courier New", monospace;
      font-size: 0.92rem;
      white-space: pre-wrap;
      word-break: break-word;
      color: var(--text-main);
    }

    .recruitment-box {
      background-color: var(--surface-soft);
      border-radius: 8px;
      padding: 20px;
      margin: 20px 0;
      border: 1px solid var(--line);
    }

    /* Light academic action buttons */
    .paper-links {
      display: inline-flex;
      flex-wrap: wrap;
      gap: 7px;
      margin-top: 8px;
    }

    .paper-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-width: 3.2rem;
      padding: 0.34rem 0.7rem;
      border-radius: 8px;
      font-size: 0.84rem;
      font-weight: 700;
      line-height: 1;
      text-decoration: none !important;
      border: 1px solid currentColor;
      box-shadow: none;
      transition: all 0.18s ease;
      letter-spacing: 0;
      font-family: "Courier New", "SFMono-Regular", Menlo, Consolas, monospace;
    }

    .paper-btn:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(30, 72, 116, 0.1);
    }

    .paper-btn:active {
      transform: translateY(0);
    }

    .btn-paper {
      background: #fff8e8;
      color: #a66a00 !important;
    }

    .btn-pdf {
      background: #eef7ff;
      color: #1d72b8 !important;
    }

    .btn-code {
      background: #ecfbf7;
      color: #087f73 !important;
    }

    .btn-bib {
      background: #f2f3ff;
      color: #5f63b8 !important;
    }

    .btn-doi {
      background: #fff0ed;
      color: #b8563f !important;
    }

    .btn-arxiv {
      background: #f6f2ff;
      color: #7655b8 !important;
    }

    .paper-btn:hover,
    .paper-btn:focus {
      color: #ffffff !important;
      border-color: transparent;
    }

    .btn-paper:hover,
    .btn-paper:focus {
      background: #a66a00;
    }

    .btn-pdf:hover,
    .btn-pdf:focus {
      background: #1d72b8;
    }

    .btn-code:hover,
    .btn-code:focus {
      background: #087f73;
    }

    .btn-bib:hover,
    .btn-bib:focus {
      background: #5f63b8;
    }

    .btn-doi:hover,
    .btn-doi:focus {
      background: #b8563f;
    }

    .btn-arxiv:hover,
    .btn-arxiv:focus {
      background: #7655b8;
    }
                    
    @media (max-width: 768px) {
      .header-container {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
      }
      
      .profile-info {
        text-align: center;
      }
      
      body {
        padding: 1rem;
      }
      
      .custom-container {
        padding: 1.4rem;
      }
      
      .paper-item {
        flex-direction: column;
        gap: 0.35rem;
        padding: 0.8rem 0;
        border-radius: 0;
        border-color: transparent;
        border-bottom: 1px solid var(--line);
      }
            
      .conference {
        width: auto;
        margin-bottom: 3px;
      }

      .timeline-item,
      .education-item {
        grid-template-columns: 4.8rem 1fr;
        gap: 0.8rem;
      }

      .timeline-list::before {
        left: 1.06rem;
      }

      .timeline-item::before {
        left: 0.84rem;
      }

      .timeline-logo {
        width: 3.25rem;
        height: 3.25rem;
      }

      .timeline-logo::before {
        width: 1.55rem;
        height: 1.78rem;
      }
    }