:root {
      --bg: #f8fafc; --bg-surface: #f1f5f9; --bg-card: #ffffff;
      --text: #0f172a; --text-muted: #64748b; --border: #e2e8f0;
      --blue: #0f52a0; --blue-mid: #1d6fd4; --blue-pale: #dbeafe;
      --purple: #7c3aed; --purple-mid: #8b5cf6; --purple-pale: #ede9fe;
      --accent: #38bdf8; --black: #080c10; --nav-bg: #f8fafc;
    }
    [data-theme="dark"] {
      --bg: #18181b; --bg-surface: #222226; --bg-card: #27272a;
      --text: #f4f4f5; --text-muted: #a1a1aa; --border: #3f3f46;
      --blue: #60a5fa; --blue-mid: #93c5fd; --blue-pale: #1e3a5f;
      --purple: #a78bfa; --purple-mid: #c4b5fd; --purple-pale: #2e1a4a;
      --accent: #38bdf8; --black: #09090b; --nav-bg: #18181b;
    }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body { font-family:var(--font-ui); background: var(--bg); color: var(--text); line-height: 1.6; transition: background 0.25s, color 0.25s; }
    .ticker-bar { background: var(--black); padding: 9px 0; overflow: hidden; white-space: nowrap; }
    .ticker-inner { display: inline-block; animation: tick 35s linear infinite; font-size: 0.72rem; font-family:var(--font-ui); color: rgba(255,255,255,0.5); letter-spacing: 0.05em; }
    .ticker-inner span { margin: 0 2rem; color: var(--accent); }
    @keyframes tick { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
    nav { position: sticky; top: 0; z-index: 100; background: var(--nav-bg); border-bottom: 1px solid var(--border); padding: 0 2.5rem; height: 60px; display: flex; align-items: center; justify-content: space-between; transition: background 0.25s; }
    .nav-logo { --font-wordmark:'Source Serif 4', serif; font-family:var(--font-wordmark); font-size: 1.15rem; font-weight: 800; color: var(--text); text-decoration: none; }
    .nav-logo span { color: var(--blue-mid); }
    .nav-right { display: flex; align-items: center; gap: 2rem; }
    .nav-links { display: flex; gap: 1.35rem; list-style: none; align-items: center; }
    .nav-links a { text-decoration: none; font-size: 0.82rem; font-weight: 500; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-muted); transition: color 0.2s; }
    .nav-links a:hover, .nav-links a.active { color: var(--blue-mid); }
    .nav-cta { background: var(--blue) !important; color: #fff !important; padding: 7px 16px !important; border-radius: 6px; }
    .theme-toggle { background: var(--bg-surface); border: 1px solid var(--border); border-radius: 20px; padding: 5px 10px; cursor: pointer; display: flex; align-items: center; gap: 6px; font-size: 0.78rem; color: var(--text-muted); font-family:var(--font-ui); white-space: nowrap; transition: background 0.2s; }
    .theme-toggle:hover { background: var(--border); }
    .article-hero {
      width: 100%;
      height: 420px;
      background-size: cover;
      background-position: center;
      background-color: #0c1a3a;
      position: relative;
      overflow: hidden;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(to bottom, rgba(0,0,0,0.15) 0%, rgba(0,0,0,0.55) 100%);
    }
    .article-wrap { max-width: 760px; margin: 0 auto; padding: 0 2rem; }
    .article-header { padding: 2.5rem 0 2rem; border-bottom: 1px solid var(--border); }
    .back-link { display: inline-flex; align-items: center; gap: 6px; font-size: 0.8rem; color: var(--text-muted); text-decoration: none; margin-bottom: 1.5rem; transition: color 0.2s; }
    .back-link:hover { color: var(--blue-mid); }
    .article-tag-ai { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--blue-mid); margin-bottom: 0.75rem; }
    .article-tag-tech { font-size: 0.7rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--purple-mid); margin-bottom: 0.75rem; }
    .article-title { font-family:var(--font-display); font-size: clamp(1.7rem, 4vw, 2.6rem); font-weight: 800; line-height: 1.12; letter-spacing: -0.03em; color: var(--text); margin-bottom: 1rem; }
    .article-meta { font-family:var(--font-ui); font-size: 0.78rem; color: var(--text-muted); display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
    .article-body { padding: 2.5rem 0 4rem; }
    .article-body p { font-size: 1.05rem; line-height: 1.9; color: var(--text); margin-bottom: 1.6rem; }
    .article-body h2 { font-family:var(--font-display); font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; color: var(--text); margin: 2.5rem 0 1rem; }
    .quick-takeaways { background:var(--bg-surface); border:1px solid var(--border); border-radius:10px; padding:1.25rem 1.4rem; margin:0 0 2rem; }
    .quick-takeaways h2 { margin:0 0 .75rem; font-size:1rem; }
    .quick-takeaways ul { padding-left:1.2rem; display:flex; flex-direction:column; gap:.55rem; }
    .quick-takeaways li { color:var(--text); line-height:1.65; }
    .whos-writing { border-top: 1px solid var(--border); padding: 2.5rem 0 3rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
    .whos-left { display: flex; align-items: center; gap: 1.25rem; }
    .whos-avatar { width: 52px; height: 52px; border-radius: 50%; background: var(--blue-pale); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; flex-shrink: 0; }
    .whos-text h3 { font-family:var(--font-display); font-size: 1rem; font-weight: 700; margin-bottom: 0.25rem; color: var(--text); }
    .whos-text p { font-size: 0.83rem; color: var(--text-muted); line-height: 1.6; max-width: 460px; }
    .bio-btn { display: inline-flex; align-items: center; gap: 8px; background: var(--blue); color: #fff; text-decoration: none; padding: 10px 22px; border-radius: 6px; font-size: 0.85rem; font-weight: 500; white-space: nowrap; transition: opacity 0.2s; flex-shrink: 0; }
    .bio-btn:hover { opacity: 0.85; }
    footer { background: var(--black); border-top: 1px solid rgba(255,255,255,0.07); padding: 1.75rem 2.5rem; display: flex; align-items: center; justify-content: space-between; }
    footer p { font-size: 0.75rem; color: rgba(255,255,255,0.3); font-family:var(--font-ui); }
    footer a { color: rgba(255,255,255,0.4); text-decoration: none; }
    footer a:hover { color: var(--accent); }
    @media (max-width: 768px) { .nav-links { display: none; } .whos-writing { flex-direction: column; align-items: flex-start; } footer { flex-direction: column; gap: 8px; } .article-hero { height: 220px; } .hero-emoji { font-size: 5rem; } }
    /* SHARE SECTION */
    .share-section { border-top: 1px solid var(--border); padding: 1.75rem 0 2rem; }
    .share-label { font-family:var(--font-ui); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 0.85rem; }
    .share-buttons { display: flex; gap: 10px; flex-wrap: wrap; }
    .share-btn { display: inline-flex; align-items: center; gap: 7px; padding: 8px 18px; border-radius: 6px; font-size: 0.82rem; font-weight: 500; text-decoration: none; cursor: pointer; border: 1px solid var(--border); background: var(--bg-card); color: var(--text); transition: background 0.18s, border-color 0.18s; font-family:var(--font-ui); }
    .share-btn:hover { background: var(--bg-surface); border-color: var(--blue-mid); color: var(--blue-mid); }
    .share-copy { }
    #copy-confirm { font-size: 0.75rem; color: var(--blue-mid); display: none; margin-left: 4px; }

    /* CITATIONS */
    .citations-section { border-top: 1px solid var(--border); padding: 2rem 0 2.5rem; }
    .citations-title { font-family:var(--font-display); font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 1rem; letter-spacing: -0.01em; }
    .citations-list { padding-left: 1.4rem; display: flex; flex-direction: column; gap: 0.6rem; }
    .citations-list li { font-size: 0.82rem; color: var(--text-muted); line-height: 1.6; }
    .citations-list a { color: var(--blue-mid); text-decoration: none; }
    .citations-list a:hover { text-decoration: underline; }

    /* BACK TO TOP */
    #back-top { position:fixed; bottom:28px; right:28px; width:42px; height:42px; border-radius:50%; background:var(--blue); color:#fff; border:none; cursor:pointer; font-size:1.1rem; display:flex; align-items:center; justify-content:center; opacity:0; pointer-events:none; transition:opacity 0.25s; z-index:900; box-shadow:0 4px 14px rgba(0,0,0,0.18); }
    #back-top.visible { opacity:1; pointer-events:auto; }

    /* HAMBURGER */
    .hamburger { display:none; flex-direction:column; gap:5px; background:none; border:none; cursor:pointer; padding:4px; }
    .hamburger span { display:block; width:22px; height:2px; background:var(--text); border-radius:2px; transition:transform 0.2s, opacity 0.2s; }
    .mobile-nav { display:none; position:absolute; top:60px; left:0; right:0; background:var(--nav-bg); border-bottom:1px solid var(--border); padding:1rem 2.5rem; flex-direction:column; gap:1rem; z-index:99; }
    .mobile-nav a { text-decoration:none; font-size:0.88rem; font-weight:500; color:var(--text-muted); text-transform:uppercase; letter-spacing:0.06em; }
    .mobile-nav a:hover { color:var(--blue-mid); }
    .mobile-nav .nav-cta { background:var(--blue); color:#fff !important; padding:8px 16px; border-radius:6px; display:inline-block; }
    @media (max-width:768px) { .hamburger { display:flex; } .nav-links { display:none !important; } .mobile-nav.open { display:flex; } nav { position:relative; } }

    /* RELATED ARTICLES */
    .related-section { border-top:1px solid var(--border); padding:2.5rem 0 3rem; }
    .related-title { font-family:var(--font-display); font-size:1rem; font-weight:700; color:var(--text); margin-bottom:1.25rem; letter-spacing:-0.01em; }
    .related-grid { display:grid; grid-template-columns:1fr 1fr; gap:16px; }
    .related-card { display:flex; flex-direction:column; text-decoration:none; background:var(--bg-card); border:1px solid var(--border); border-radius:10px; overflow:hidden; transition:border-color 0.2s; }
    .related-card:hover { border-color:var(--blue-mid); }
    .related-thumb { height:110px; background-size:cover; background-position:center; background-color:var(--bg-surface); }
    .related-body { padding:1rem; }
    .related-tag { font-size:0.65rem; font-weight:600; letter-spacing:0.09em; text-transform:uppercase; color:var(--blue-mid); margin-bottom:0.4rem; }
    .related-tag-tech { color:#a78bfa; }
    .related-card h4 { font-family:var(--font-display); font-size:0.9rem; font-weight:700; line-height:1.35; color:var(--text); margin-bottom:0.35rem; }
    .related-card span { font-family:var(--font-ui); font-size:0.7rem; color:var(--text-muted); }
    @media (max-width:600px) { .related-grid { grid-template-columns:1fr; } }

    /* TABLE OF CONTENTS */
    .toc-box { background:var(--bg-surface); border:1px solid var(--border); border-radius:10px; padding:1.25rem 1.5rem; margin-bottom:2.5rem; }
    .toc-label { font-family:var(--font-ui); font-size:0.68rem; letter-spacing:0.1em; text-transform:uppercase; color:var(--text-muted); margin-bottom:0.75rem; }
    .toc-list { list-style:none; display:flex; flex-direction:column; gap:0.4rem; }
    .toc-list a { font-size:0.85rem; color:var(--blue-mid); text-decoration:none; }
    .toc-list a:hover { text-decoration:underline; }

    /* ACTIVE NAV */
    .nav-links a.active { color:var(--blue-mid) !important; }