:root {
      --uh-navy: #0D2240;
      --uh-navy-light: #1a3a5c;
      --uh-red: #b70022;
      --uh-red-hover: #9a001c;
      --uh-white: #ffffff;
      --uh-offwhite: #f5f5f5;
      --uh-gray-100: #e6e6e6;
      --uh-gray-600: #555555;
      --uh-text: #2c2c2c;
    }

    * { margin: 0; padding: 0; box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      font-family: 'Inter', sans-serif;
      color: var(--uh-text);
      background: var(--uh-white);
      line-height: 1.6;
    }

    .top-bar {
      background: var(--uh-navy);
      color: var(--uh-white);
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-bar a {
      color: var(--uh-white);
      text-decoration: none;
      font-size: 0.95rem;
      transition: opacity 0.3s;
    }

    .top-bar a:hover { opacity: 0.8; }
    .top-bar-title {
      font-family: 'Roboto Slab', serif;
      font-size: 1.3rem;
      font-weight: 600;
      text-align: center;
      flex: 1;
    }

    .lang-switcher {
      display: flex;
      gap: 0.5rem;
    }

    .lang-btn {
      background: transparent;
      border: 1px solid var(--uh-white);
      color: var(--uh-white);
      padding: 0.4rem 0.8rem;
      font-size: 0.85rem;
      cursor: pointer;
      border-radius: 4px;
      transition: all 0.3s;
      font-weight: 500;
    }

    .lang-btn.active {
      background: var(--uh-red);
      border-color: var(--uh-red);
    }

    .hero {
      background: linear-gradient(135deg, var(--uh-navy) 0%, var(--uh-navy-light) 100%);
      color: var(--uh-white);
      padding: 3rem 2rem;
      text-align: center;
    }

    .hero h1 {
      font-family: 'Roboto Slab', serif;
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
      font-weight: 600;
    }

    .hero p { font-size: 1.1rem; color: #e0e8f0; }

    .audience-tabs {
      background: var(--uh-offwhite);
      padding: 1.5rem 2rem;
      display: flex;
      justify-content: center;
      gap: 1rem;
      flex-wrap: wrap;
    }

    .tab-btn {
      padding: 0.7rem 1.5rem;
      border: 2px solid var(--uh-navy);
      background: var(--uh-white);
      color: var(--uh-navy);
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border-radius: 50px;
      transition: all 0.3s;
      font-family: 'Inter', sans-serif;
    }

    .tab-btn.active {
      background: var(--uh-navy);
      color: var(--uh-white);
    }

    .tab-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .container {
      max-width: 820px;
      margin: 0 auto;
      padding: 2rem;
    }

    .content-section { display: none; }
    .content-section.active { display: block; }

    h2 {
      font-family: 'Roboto Slab', serif;
      font-size: 1.6rem;
      font-weight: 600;
      color: var(--uh-navy);
      margin: 2rem 0 1rem 0;
      padding-left: 1rem;
      border-left: 4px solid var(--uh-red);
    }

    h3 {
      font-family: 'Roboto Slab', serif;
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--uh-navy);
      margin: 1.5rem 0 0.8rem 0;
    }

    p { margin-bottom: 1rem; color: var(--uh-text); line-height: 1.7; }
    ul { margin: 1rem 0 1rem 2rem; }
    li { margin-bottom: 0.5rem; }

    .section-divider {
      height: 1px;
      background: var(--uh-gray-100);
      margin: 2rem 0;
    }

    .svg-container {
      text-align: center;
      margin: 2rem 0;
    }

    .svg-container svg {
      max-width: 100%;
      height: auto;
    }

    .img-placeholder {
      background: #f0f2f5;
      border: 2px dashed #ccc;
      border-radius: 8px;
      padding: 3rem 2rem;
      text-align: center;
      color: #888;
      font-size: 0.85rem;
      font-style: italic;
      aspect-ratio: 16/9;
      max-width: 600px;
      margin: 1.5rem auto;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .img-comparison {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      max-width: 580px;
      margin: 1.8rem auto;
      align-items: end;
    }
    .img-comparison div {
      text-align: center;
    }
    .img-comparison img {
      width: 100%;
      height: 250px;
      object-fit: contain;
      border-radius: 6px;
      border: 1px solid var(--uh-gray-100);
      box-shadow: 0 2px 12px rgba(0,0,0,.08);
      background: #f8f8f8;
    }
    .img-comparison span, .img-single span {
      display: block;
      font-size: .75rem;
      color: var(--uh-gray-600);
      margin-top: .4rem;
      font-weight: 500;
    }
    .img-single {
      max-width: 480px;
      margin: 1.8rem auto;
      text-align: center;
    }
    .img-single img {
      width: 100%;
      max-height: 320px;
      object-fit: contain;
      border-radius: 6px;
      border: 1px solid var(--uh-gray-100);
      box-shadow: 0 2px 12px rgba(0,0,0,.08);
      background: #f8f8f8;
    }
    @media(max-width:480px) {
      .img-comparison { grid-template-columns: 1fr; max-width: 300px; }
      .img-comparison img { max-height: 220px; }
      .img-single { max-width: 320px; }
      .img-single img { max-height: 240px; }
    }

    .cta-box {
      background: var(--uh-offwhite);
      border: 2px solid var(--uh-red);
      border-radius: 8px;
      padding: 2rem;
      margin: 2rem 0;
      text-align: center;
    }

    .cta-box a {
      display: inline-block;
      background: var(--uh-red);
      color: var(--uh-white);
      padding: 0.8rem 2rem;
      border-radius: 4px;
      text-decoration: none;
      font-weight: 600;
      transition: all 0.3s;
      margin-top: 1rem;
    }

    .cta-box a:hover { background: var(--uh-red-hover); }

    .footer {
      background: var(--uh-navy);
      color: var(--uh-white);
      text-align: center;
      padding: 2rem;
      margin-top: 3rem;
      font-size: 0.9rem;
    }

    /* Table of Contents */
    .toc-wrapper {
      background: var(--uh-offwhite);
      border: 1px solid var(--uh-gray-100);
      border-radius: 8px;
      margin-bottom: 2rem;
      overflow: hidden;
    }
    .toc-toggle {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      padding: 0.75rem 1.2rem;
      background: none;
      border: none;
      cursor: pointer;
      font-family: 'Inter', sans-serif;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--uh-navy);
    }
    .toc-toggle::after {
      content: '\25BC';
      font-size: 0.7rem;
      transition: transform 0.3s;
    }
    .toc-wrapper.open .toc-toggle::after {
      transform: rotate(180deg);
    }
    .toc-list {
      list-style: none;
      padding: 0 1.2rem 1rem;
      margin: 0;
      display: none;
    }
    .toc-wrapper.open .toc-list {
      display: block;
    }
    .toc-list li {
      padding: 0.35rem 0;
      border-bottom: 1px solid var(--uh-gray-100);
    }
    .toc-list li:last-child { border-bottom: none; }
    .toc-list a {
      color: var(--uh-navy-light);
      text-decoration: none;
      font-size: 0.85rem;
      transition: color 0.2s;
    }
    .toc-list a:hover { color: var(--uh-red); }

    /* CTA Section */
    .cta-referral {
      background: var(--uh-navy);
      color: white;
      text-align: center;
      padding: 2rem;
      border-radius: 10px;
      margin-top: 2rem;
    }
    .cta-referral h3 { margin: 0 0 0.5rem; font-size: 1.2rem; }
    .cta-referral p { margin: 0 0 1rem; font-size: 0.95rem; color: #e8edf5; }
    .cta-referral a {
      display: inline-block;
      background: var(--uh-red);
      color: white;
      padding: 0.7rem 2rem;
      border-radius: 6px;
      text-decoration: none;
      font-weight: 600;
      transition: background 0.3s;
    }
    .cta-referral a:hover { background: var(--uh-red-hover); }

    @media (max-width: 768px) {
      .hero h1 { font-size: 1.8rem; }
      .top-bar { flex-direction: column; gap: 1rem; }
      .audience-tabs { flex-direction: column; align-items: center; }
      .tab-btn { min-width: 200px; }
      h2 { font-size: 1.3rem; }
      .container { padding: 1rem; }
    }