/* --- Main Variables --- */
    :root {
      --bg-main: #f4f2ec;
      --navy: #192341;
      --navy-hover: #2a3863;
      --text-dark: #111111;
      --text-gray: #555555;
      --index-active: #5f6a78; /* Grey color for active index item */
      --index-line: #7a8fa6;
      
      --font-sans: 'Inter', sans-serif;
      --font-serif: 'Fraunces', serif;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-dark);
      font-family: var(--font-sans);
    }

    /* --- Page Container --- */
    .blog-main {
      padding-top: 150px; /* Clears fixed header */
      padding-bottom: 100px;
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 40px;
      padding-right: 40px;
    }

    /* --- Hero Section --- */
    .blog-hero {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
      margin-bottom: 80px;
    }

    .blog-hero-text {
      max-width: 500px;
    }

    .blog-title {
      font-family: var(--font-serif);
      font-size: 3.5rem;
      line-height: 1.15;
      font-weight: 400;
      color: #000;
      margin-bottom: 25px;
    }

    .blog-subtitle {
      font-family: var(--font-sans);
      font-size: 1.15rem;
      line-height: 1.5;
      color: #444;
      font-weight: 400;
    }

    .blog-hero-image img {
      width: 100%;
      height: auto;
      border: 1px solid rgba(0,0,0,0.1);
      box-shadow: 0 10px 30px rgba(0,0,0,0.05);
      object-fit: cover;
    }

    /* --- Two Column Layout (Index + Article) --- */
    .blog-layout {
      display: grid;
      grid-template-columns: 320px 1fr;
      gap: 80px;
    }

    /* --- Sidebar Index --- */
    .index-sidebar {
      position: sticky;
      top: 120px;
      align-self: start;
    }

    .index-title {
      font-family: var(--font-serif);
      font-size: 2.2rem;
      font-weight: 400;
      color: #000;
      margin-bottom: 20px;
      padding-bottom: 15px;
      border-bottom: 4px solid var(--index-line);
    }

    .index-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
    }

    .index-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      background-color: var(--navy);
      color: #fff;
      padding: 18px 20px;
      text-decoration: none;
      font-family: var(--font-sans);
      font-size: 0.95rem;
      line-height: 1.4;
      font-weight: 500;
      transition: background-color 0.2s ease;
    }

    .index-item:hover {
      background-color: var(--navy-hover);
    }

    .index-item.active {
      background-color: var(--index-active);
    }

    .index-item svg {
      flex-shrink: 0;
      margin-left: 15px;
      width: 16px;
      height: 16px;
    }

    /* --- Article Content --- */
    .article-body {
      font-family: var(--font-sans);
      font-size: 1.1rem;
      line-height: 1.7;
      color: #111;
      max-width: 650px;
    }

    .article-body p {
      margin-bottom: 20px;
    }

    .article-body strong {
      font-weight: 700;
    }

    .article-body h3 {
      font-family: var(--font-serif);
      font-size: 2.2rem;
      font-weight: 400;
      color: #000;
      margin-top: 60px;
      margin-bottom: 25px;
    }

    .article-body ul {
      margin-bottom: 25px;
      padding-left: 20px;
      list-style-type: disc;
    }

    .article-body li {
      margin-bottom: 12px;
      padding-left: 5px;
    }

    .article-conclusion {
      font-family: var(--font-sans);
      font-size: 1.15rem;
      font-weight: 700;
      color: #000;
      margin-top: 50px;
      padding-top: 40px;
      border-top: 1px solid #ccc;
    }

    /* --- Responsive Adjustments --- */
    @media (max-width: 992px) {
      .blog-layout {
        grid-template-columns: 1fr; /* Stack sidebar and article */
        gap: 50px;
      }

      .index-sidebar {
        position: relative;
        top: 0;
      }
    }

    @media (max-width: 768px) {
      .blog-main {
        padding-top: 120px;
        padding-left: 20px;
        padding-right: 20px;
      }

      .blog-hero {
        grid-template-columns: 1fr; /* Stack title and image */
        gap: 40px;
        margin-bottom: 50px;
      }

      .blog-title {
        font-size: 2.5rem;
      }

      .article-body h3 {
        font-size: 1.8rem;
        margin-top: 40px;
      }
    }