:root {
    --blog-primary: #0d6efd;
    --blog-ink: #0f1923;
    --blog-mist: #f5f7fa;
    --blog-rule: #e2e8f0;
    --blog-accent: #f59e0b;
  }

  /* ── Progress bar ── */
  #readProgress {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    background: linear-gradient(90deg, #0d6efd, #f59e0b);
    width: 0%;
    z-index: 9999;
    transition: width .1s linear;
  }

  /* ── Article hero ── */
  .article-hero {
    margin-top: 56px;
    background: linear-gradient(135deg, #0d1f44 0%, #0d6efd 100%);
    padding: 72px 0 56px;
    position: relative;
    overflow: hidden;
  }
  .article-hero::after {
    content: '✈';
    position: absolute;
    right: -30px; bottom: -20px;
    font-size: 14rem;
    opacity: .04;
    line-height: 1;
  }
  .article-back {
    font-family: 'DM Sans', sans-serif;
    font-size: .82rem;
    font-weight: 500;
    color: rgba(255,255,255,.7);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 20px;
    transition: color .15s;
  }
  .article-back:hover { color: #fff; }
  .article-badge {
    display: inline-block;
    font-family: 'DM Sans', sans-serif;
    font-size: .72rem;
    font-weight: 600;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: #fbbf24;
    background: rgba(251,191,36,.15);
    border: 1px solid rgba(251,191,36,.3);
    padding: 4px 12px;
    border-radius: 4px;
    margin-bottom: 16px;
  }
  .article-hero h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 4.5vw, 2.8rem);
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 20px;
    max-width: 720px;
  }
  .article-meta {
    font-family: 'DM Sans', sans-serif;
    font-size: .85rem;
    color: rgba(255,255,255,.65);
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    align-items: center;
  }
  .article-meta span { display: flex; align-items: center; gap: 6px; }

  /* ── Thumbnail ── */
  .article-thumbnail {
    width: 100%;
    max-height: 440px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: 40px;
    box-shadow: 0 8px 40px rgba(0,0,0,.12);
  }
  .article-thumb-placeholder {
    width: 100%;
    height: 280px;
    background: linear-gradient(135deg, #e8f0fe, #dbeafe);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 5rem;
    margin-bottom: 40px;
  }

  /* ── Article layout ── */
  .article-wrap { padding: 48px 0 64px; }
  .article-main { max-width: 720px; }

  /* ── TOC ── */
  .toc-box {
    background: var(--blog-mist);
    border-left: 4px solid var(--blog-primary);
    border-radius: 0 8px 8px 0;
    padding: 20px 24px;
    margin-bottom: 36px;
  }
  .toc-box h4 {
    font-family: 'DM Sans', sans-serif;
    font-size: .82rem;
    font-weight: 600;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--blog-primary);
    margin-bottom: 12px;
  }
  .toc-box ol { padding-left: 18px; margin: 0; }
  .toc-box li {
    font-family: 'DM Sans', sans-serif;
    font-size: .88rem;
    color: #475569;
    margin-bottom: 6px;
  }
  .toc-box li a { color: inherit; text-decoration: none; }
  .toc-box li a:hover { color: var(--blog-primary); }

  /* ── Article body typography ── */
  .article-body {
    font-family: 'DM Sans', sans-serif;
    font-size: 1rem;
    line-height: 1.8;
    color: #334155;
  }
  .article-body h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--blog-ink);
    margin: 40px 0 14px;
    padding-top: 8px;
    border-top: 2px solid var(--blog-rule);
  }
  .article-body h3 {
    font-family: 'Playfair Display', serif;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--blog-ink);
    margin: 28px 0 10px;
  }
  .article-body p { margin-bottom: 20px; }
  .article-body ul, .article-body ol { padding-left: 22px; margin-bottom: 20px; }
  .article-body li { margin-bottom: 8px; }
  .article-body strong { color: var(--blog-ink); }
  .article-body a { color: var(--blog-primary); text-decoration: underline; }
  .article-body blockquote {
    border-left: 4px solid var(--blog-accent);
    background: #fffbeb;
    padding: 16px 20px;
    margin: 28px 0;
    border-radius: 0 8px 8px 0;
    font-style: italic;
    color: #92400e;
  }
  .article-body .tip-box {
    background: #eff6ff;
    border: 1.5px solid #bfdbfe;
    border-radius: 10px;
    padding: 18px 20px;
    margin: 28px 0;
  }
  .article-body .tip-box::before {
    content: '💡 TIP';
    display: block;
    font-family: 'DM Sans', sans-serif;
    font-size: .72rem;
    font-weight: 700;
    letter-spacing: .12em;
    color: var(--blog-primary);
    margin-bottom: 8px;
  }

  /* ── Share bar ── */
  .share-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 24px 0;
    border-top: 1.5px solid var(--blog-rule);
    border-bottom: 1.5px solid var(--blog-rule);
    margin: 40px 0;
    flex-wrap: wrap;
  }
  .share-label {
    font-family: 'DM Sans', sans-serif;
    font-size: .82rem;
    font-weight: 600;
    color: #94a3b8;
    letter-spacing: .08em;
    text-transform: uppercase;
    margin-right: 4px;
  }
  .share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: 'DM Sans', sans-serif;
    font-size: .82rem;
    font-weight: 500;
    padding: 7px 16px;
    border-radius: 50px;
    border: 1.5px solid var(--blog-rule);
    text-decoration: none;
    color: #475569;
    background: #fff;
    cursor: pointer;
    transition: all .15s;
  }
  .share-btn:hover { border-color: var(--blog-primary); color: var(--blog-primary); }
  .share-btn.copy-btn.copied { background: #dcfce7; border-color: #4ade80; color: #16a34a; }

  /* ── Sidebar ── */
  .article-sidebar { padding-left: 28px; }
  @media (max-width: 991px) { .article-sidebar { padding-left: 0; margin-top: 48px; } }

  .sidebar-card {
    background: #fff;
    border: 1.5px solid var(--blog-rule);
    border-radius: 12px;
    padding: 22px;
    margin-bottom: 24px;
  }
  .sidebar-card h4 {
    font-family: 'Playfair Display', serif;
    font-size: 1rem;
    font-weight: 700;
    color: var(--blog-ink);
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 1.5px solid var(--blog-rule);
  }

  /* ── CTA card ── */
  .cta-card {
    background: linear-gradient(135deg, #0d6efd, #0a4fcf);
    color: #fff;
    border-radius: 12px;
    padding: 28px 22px;
    text-align: center;
    margin-bottom: 24px;
  }
  .cta-card .icon { font-size: 2.5rem; margin-bottom: 10px; }
  .cta-card h4 {
    font-family: 'Playfair Display', serif;
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
  }
  .cta-card p {
    font-family: 'DM Sans', sans-serif;
    font-size: .85rem;
    opacity: .85;
    margin-bottom: 18px;
  }
  .cta-btn {
    display: inline-block;
    background: #fff;
    color: var(--blog-primary);
    font-family: 'DM Sans', sans-serif;
    font-size: .88rem;
    font-weight: 700;
    padding: 10px 24px;
    border-radius: 50px;
    text-decoration: none;
    transition: transform .15s, box-shadow .15s;
  }
  .cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,.18);
    color: var(--blog-primary);
  }

  /* ── Related / Recent posts ── */
  .related-post {
    display: flex;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--blog-rule);
    text-decoration: none;
    color: inherit;
    transition: color .15s;
  }
  .related-post:last-child { border-bottom: none; }
  .related-post:hover { color: var(--blog-primary); }
  .rp-thumb {
    width: 58px; height: 58px;
    border-radius: 8px;
    background: linear-gradient(135deg, #e8f0fe, #dbeafe);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.5rem;
    flex-shrink: 0;
    overflow: hidden;
  }
  .rp-thumb img { width: 100%; height: 100%; object-fit: cover; }
  .rp-info h5 {
    font-family: 'DM Sans', sans-serif;
    font-size: .85rem;
    font-weight: 500;
    line-height: 1.35;
    margin: 0 0 4px;
  }
  .rp-info span {
    font-family: 'DM Sans', sans-serif;
    font-size: .75rem;
    color: #94a3b8;
  }

  /* ── Animations ── */
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(18px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  .fade-up { animation: fadeUp .5s ease both; }