:root {
    --bg:            #F5F1EB;
    --bg-alt:        #EDEAE3;
    --surface:       #FFFFFF;
    --border:        #DDD9D0;
    --border-light:  #EAE7E0;
    --text:          #1A1714;
    --text-body:     #3D3A35;
    --text-muted:    #6B6760;
    --text-subtle:   #9B9892;
    --accent:        #C85C2D;
    --accent-bg:     #FDF1EB;
    --accent-border: #F0C4A8;
    --shadow:        rgba(200,92,45,0.08);
    --green:         #2A7A4B;
    --green-bg:      #EAF5EF;
    --green-border:  #A8D9BC;
    --blue:          #2563A8;
    --blue-bg:       #EAF1FA;
    --blue-border:   #A8C5E8;
    --red:           #B83535;
    --red-bg:        #FAEBEB;
    --red-border:    #E8AAAA;
    --serif:  'Newsreader', Georgia, serif;
    --sans:   'Inter', system-ui, sans-serif;
    --mono:   'JetBrains Mono', 'Courier New', monospace;
    /* timeline brand colors */
    --nvidia:  #76B900;
    --dh:      #E00024;
    --infrrd:  #00A651;
  }

  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body { background: var(--bg); color: var(--text-body); font-family: var(--sans); font-size: 17px; line-height: 1.75; }

  /* ─── NAV ─────────────────────────────────────────────── */
  nav {
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 0 48px; height: 52px; display: flex; align-items: center;
    justify-content: space-between; position: sticky; top: 0; z-index: 100;
  }
  .nav-brand { font-family: var(--sans); font-size: 13px; font-weight: 600; color: var(--text); letter-spacing: 0.01em; text-decoration: none; }
  .nav-tag   { background: var(--accent); color: #fff; font-size: 11px; font-weight: 600; padding: 3px 9px; border-radius: 3px; letter-spacing: 0.04em; }

  /* ─── LAYOUT ──────────────────────────────────────────── */
  .page-wrap { max-width: 980px; margin: 0 auto; padding: 0 32px 80px; }

  /* ─── HERO ────────────────────────────────────────────── */
  .hero { padding: 72px 0 64px; border-bottom: 1px solid var(--border); margin-bottom: 64px; }
  .hero-layout { display: flex; align-items: center; gap: 56px; }
  .hero-text { flex: 1; min-width: 0; }
  .hero-tagline { font-family: var(--mono); font-size: 11px; font-weight: 500; color: var(--accent); letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 16px; }
  .hero h1 { font-family: var(--serif); font-size: clamp(42px, 5.5vw, 60px); font-weight: 600; line-height: 1.04; letter-spacing: -0.025em; color: var(--text); margin-bottom: 8px; }
  .hero-bio { font-family: var(--serif); font-size: 18px; font-style: italic; font-weight: 500; line-height: 1.75; color: var(--text-muted); margin-bottom: 36px; }

  .hero-ctas { display: flex; gap: 10px; flex-wrap: wrap; }
  .cta-link { display: inline-flex; align-items: center; gap: 7px; font-family: var(--sans); font-size: 13px; font-weight: 600; text-decoration: none; padding: 9px 16px; border-radius: 6px; letter-spacing: 0.01em; transition: opacity 0.15s; }
  .cta-link:hover { opacity: 0.82; }
  .cta-link svg  { width: 15px; height: 15px; flex-shrink: 0; }
  .cta-primary   { background: var(--text); color: #fff; }
  .cta-linkedin  { background: #0A66C2; color: #fff; }
  .cta-medium    { background: var(--surface); color: var(--text); border: 1px solid var(--border); }

  .hero-pic-wrap { flex-shrink: 0; padding-top: 6px; }
  @keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    33%       { transform: translateY(-7px) rotate(0.4deg); }
    66%       { transform: translateY(-3px) rotate(-0.3deg); }
  }
  @keyframes shimmer-border {
    0%, 100% { box-shadow: 0 8px 32px rgba(200,92,45,0.10); }
    50%       { box-shadow: 0 14px 40px rgba(200,92,45,0.22), 0 0 0 4px rgba(200,92,45,0.06); }
  }
  .hero-pic {
    width: 160px; height: 160px; border-radius: 18px;
    object-fit: cover; object-position: top center; display: block;
    border: 2px solid var(--border);
    animation: float 5s ease-in-out infinite, shimmer-border 4s ease-in-out infinite;
    transition: border-color 0.3s;
  }
  .hero-pic:hover { border-color: var(--accent); animation-play-state: paused; }

  /* ─── SECTION CHROME ──────────────────────────────────── */
  .section-wrap { margin-bottom: 64px; padding-bottom: 64px; border-bottom: 1px solid var(--border); }
  .section-label { font-family: var(--sans); font-size: 11px; font-weight: 600; color: var(--accent); letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 10px; }
  .section-heading { font-family: var(--serif); font-size: 26px; font-weight: 600; letter-spacing: -0.01em; color: var(--text); margin-bottom: 32px; }

  /* ════════════════════════════════════════════════════════
     HORIZONTAL TIMELINE — year-by-year 2009–2026
  ════════════════════════════════════════════════════════ */
  .tl-scroll-wrap { padding-bottom: 8px; }

  .tl-track {
    display: flex;
    width: 100%;
  }

  /* ── each year column ── */
  .tl-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 0;
  }

  /* year label */
  .tl-yr {
    font-family: var(--mono);
    font-size: 9px;
    color: var(--text-subtle);
    letter-spacing: 0.03em;
    padding-bottom: 6px;
    text-align: center;
    white-space: nowrap;
    line-height: 1;
  }

  /* coloured line bar */
  .tl-bar {
    width: 100%;
    height: 6px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .tl-col.nvidia .tl-bar  { background: var(--nvidia); }
  .tl-col.dh .tl-bar      { background: var(--dh); }
  .tl-col.infrrd .tl-bar  { background: var(--infrrd); }

  /* tick mark on each bar */
  .tl-bar::after {
    content: '';
    display: block;
    width: 1px;
    height: 12px;
    background: rgba(255,255,255,0.55);
    position: absolute;
  }

  /* icon slot below the bar — fixed height so columns align */
  .tl-icon-slot {
    margin-top: 10px;
    height: 48px;
    display: flex;
    align-items: flex-start;
    justify-content: center;
  }

  /* company logo button */
  .tl-logo-btn {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    border: 2px solid var(--border);
    background: var(--surface);
    overflow: hidden;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  }
  .tl-logo-btn img { width: 100%; height: 100%; object-fit: contain; }
  .tl-logo-btn:hover { transform: translateY(-3px); box-shadow: 0 5px 16px rgba(0,0,0,0.14); }
  .tl-logo-btn.active { border-color: var(--accent); box-shadow: 0 4px 18px rgba(200,92,45,0.22); transform: translateY(-2px); }

  /* company label below icon — clipped to column width */
  .tl-icon-name {
    font-family: var(--sans);
    font-size: 8px;
    font-weight: 500;
    color: var(--text-subtle);
    margin-top: 4px;
    text-align: center;
    letter-spacing: 0.02em;
    max-width: 100%;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
  }

  /* ── detail panel ── */
  .tl-mobile { display: none; }
  .tl-detail-wrap { margin-top: 28px; }
  .tl-detail {
    display: none;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 28px 32px;
  }
  .tl-detail.open { display: block; animation: fadeSlide 0.22s ease; }
  @keyframes fadeSlide { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

  .tl-detail-header { display: flex; align-items: center; gap: 14px; margin-bottom: 24px; padding-bottom: 20px; border-bottom: 1px solid var(--border-light); }
  .tl-detail-logo   { width: 44px; height: 44px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); display: flex; align-items: center; justify-content: center; overflow: hidden; flex-shrink: 0; padding: 4px; }
  .tl-detail-logo img { width: 100%; height: 100%; object-fit: contain; }
  .tl-detail-company { font-family: var(--serif); font-size: 20px; font-weight: 600; color: var(--text); }
  .tl-detail-total   { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

  .tl-roles { display: flex; flex-direction: column; }
  .tl-role  { display: grid; grid-template-columns: 1fr auto; gap: 4px 24px; padding: 14px 0; border-bottom: 1px solid var(--border-light); align-items: start; }
  .tl-role:last-child { border-bottom: none; padding-bottom: 0; }
  .tl-role-title { font-size: 14px; font-weight: 500; color: var(--text); }
  .tl-role-desc  { font-size: 13px; color: var(--text-muted); grid-column: 1; margin-top: 3px; line-height: 1.55; }
  .tl-role-dates { font-family: var(--mono); font-size: 11px; color: var(--text-subtle); white-space: nowrap; padding-top: 2px; }

  .tl-exit {
    margin-top: 20px;
    padding: 14px 18px;
    background: var(--bg-alt);
    border-radius: 6px;
    border-left: 3px solid var(--border);
    font-family: var(--serif);
    font-size: 14px;
    font-style: italic;
    color: var(--text-muted);
    line-height: 1.65;
  }
  .tl-exit-label {
    font-family: var(--mono);
    font-size: 10px;
    font-style: normal;
    font-weight: 500;
    color: var(--text-subtle);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    display: block;
    margin-bottom: 6px;
  }

  /* ════════════════════════════════════════════════════════
     ARTICLE LIST  (one per row, rectangular)
  ════════════════════════════════════════════════════════ */
  .filter-bar { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 0; }
  .filter-pill { font-family: var(--sans); font-size: 12px; font-weight: 500; padding: 5px 14px; border-radius: 20px; border: 1px solid var(--border); background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all 0.15s; }
  .filter-pill:hover { border-color: var(--accent); color: var(--accent); }
  .filter-pill.active { background: var(--accent); color: #fff; border-color: var(--accent); }
  /* search box */
  .article-search { width: 100%; box-sizing: border-box; font-family: var(--sans); font-size: 13px; padding: 9px 14px; margin-bottom: 16px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); color: var(--text-body); transition: border-color 0.15s; }
  .article-search::placeholder { color: var(--text-subtle); }
  .article-search:focus { outline: none; border-color: var(--accent); }
  /* two-row filter layout (category + flavor) */
  .filter-row { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
  .filter-lead { font-family: var(--mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-subtle); flex-shrink: 0; width: 56px; padding-top: 4px; }
  .filter-row:last-of-type { margin-bottom: 24px; }
  /* flavor chips (interactive filter) */
  .flavor-bar { display: flex; flex-wrap: wrap; gap: 6px; }
  .flavor-chip { font-family: var(--mono); font-size: 11px; font-weight: 500; padding: 3px 10px; border-radius: 20px; border: 1px solid var(--border); background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all 0.15s; }
  .flavor-chip::before { content: "#"; opacity: 0.55; }
  .flavor-chip:hover { border-color: var(--accent); color: var(--accent); }
  .flavor-chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }
  /* flavor chips shown on each article card (display-only) */
  .card-flavors { display: inline-flex; flex-wrap: wrap; gap: 5px; }
  .card-flavor { font-family: var(--mono); font-size: 9px; padding: 1px 6px; border-radius: 3px; border: 1px solid var(--border); color: var(--text-subtle); white-space: nowrap; }
  .card-flavor::before { content: "#"; opacity: 0.5; }

  .articles-list { display: flex; flex-direction: column; gap: 8px; }

  .art-row {
    display: flex;
    align-items: stretch;
    text-decoration: none;
    color: inherit;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 7px;
    overflow: hidden;
    transition: box-shadow 0.15s, transform 0.15s;
  }
  .art-row:hover { box-shadow: 0 3px 16px rgba(0,0,0,0.08); transform: translateX(2px); }
  .art-row.hidden { display: none; }

  /* Left accent strip */
  .art-strip { width: 4px; flex-shrink: 0; }
  .art-ai    .art-strip { background: var(--blue); }
  .art-sec   .art-strip { background: var(--red); }
  .art-infra .art-strip { background: var(--green); }
  .art-policy .art-strip { background: var(--accent); }
  .art-data  .art-strip { background: var(--blue); }
  .art-interactive .art-strip { background: var(--green); }

  /* Body */
  .art-body { flex: 1; padding: 14px 20px; min-width: 0; }
  .art-top  { display: flex; align-items: baseline; gap: 10px; margin-bottom: 3px; flex-wrap: wrap; }

  .art-badge { display: inline-block; font-family: var(--mono); font-size: 9px; font-weight: 500; padding: 2px 7px; border-radius: 3px; letter-spacing: 0.05em; text-transform: uppercase; white-space: nowrap; flex-shrink: 0; }
  .badge-ai          { background: var(--blue-bg);   color: var(--blue);   border: 1px solid var(--blue-border); }
  .badge-sec         { background: var(--red-bg);    color: var(--red);    border: 1px solid var(--red-border); }
  .badge-infra       { background: var(--green-bg);  color: var(--green);  border: 1px solid var(--green-border); }
  .badge-policy      { background: var(--accent-bg); color: var(--accent); border: 1px solid var(--accent-border); }
  .badge-data        { background: var(--blue-bg);   color: var(--blue);   border: 1px solid var(--blue-border); }
  .badge-interactive { background: var(--green-bg);  color: var(--green);  border: 1px solid var(--green-border); }

  .art-title { font-family: var(--serif); font-size: 16px; font-weight: 600; color: var(--text); line-height: 1.3; }
  .art-quote { font-size: 12px; font-style: italic; color: var(--text-subtle); margin-top: 3px; line-height: 1.5; }
  .art-quote code { font-style: normal; font-family: var(--mono); font-size: 0.9em; }
  .art-desc  { font-size: 13px; color: var(--text-muted); margin-top: 4px; line-height: 1.55; }
  .art-desc code { font-family: var(--mono); font-size: 0.85em; background: var(--accent-bg); border: 1px solid var(--accent-border); padding: 1px 4px; border-radius: 3px; color: var(--accent); }

  /* Meta (right side) */
  .art-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: center;
    gap: 6px;
    padding: 14px 18px;
    flex-shrink: 0;
    border-left: 1px solid var(--border-light);
    min-width: 130px;
  }
  .art-date { font-family: var(--mono); font-size: 10px; color: var(--text-subtle); white-space: nowrap; }
  .art-actions { display: flex; align-items: center; gap: 8px; }
  .art-link { font-size: 13px; font-weight: 600; color: var(--accent); white-space: nowrap; }

  /* share button (reused) */
  .share-btn { background: none; border: 1px solid var(--border); border-radius: 50%; width: 26px; height: 26px; display: flex; align-items: center; justify-content: center; cursor: pointer; color: var(--text-subtle); transition: all 0.15s; padding: 0; }
  .share-btn:hover { border-color: var(--accent); color: var(--accent); }
  .share-btn.copied { border-color: var(--green); color: var(--green); }
  .share-btn svg { width: 12px; height: 12px; }

  /* ─── NAV LINKS ──────────────────────────────────────── */
  .nav-links { display: flex; gap: 20px; }
  .nav-link { font-family: var(--sans); font-size: 13px; font-weight: 500; color: var(--text-muted); text-decoration: none; letter-spacing: 0.01em; transition: color 0.15s; }
  .nav-link:hover { color: var(--text); }
  .nav-link.active { color: var(--accent); }

  /* ─── SCROLL ANCHOR OFFSET ───────────────────────────── */
  .section-anchor { scroll-margin-top: 64px; }

  /* ─── TECH STACK ─────────────────────────────────────── */
  .tech-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 16px; }
  .tech-group { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 18px 20px; }
  .tech-group-label { font-family: var(--sans); font-size: 11px; font-weight: 600; color: var(--text-muted); letter-spacing: 0.08em; text-transform: uppercase; margin-bottom: 12px; padding-bottom: 10px; border-bottom: 1px solid var(--border-light); }
  .tech-badges { display: flex; flex-wrap: wrap; gap: 6px; }
  .tech-badge { display: inline-block; font-family: var(--mono); font-size: 10px; font-weight: 500; padding: 3px 9px; border-radius: 4px; letter-spacing: 0.04em; white-space: nowrap; border: 1px solid; line-height: 1.6; }
  .tech-blue    { background: var(--blue-bg);   color: var(--blue);   border-color: var(--blue-border); }
  .tech-green   { background: var(--green-bg);  color: var(--green);  border-color: var(--green-border); }
  .tech-accent  { background: var(--accent-bg); color: var(--accent); border-color: var(--accent-border); }
  .tech-neutral { background: var(--bg-alt);    color: var(--text-muted); border-color: var(--border); }

  /* ─── EMBEDDED MIND MAP ──────────────────────────────── */
  .tech-map-wrap {
    border: 1px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 24px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.06);
  }
  .tech-map-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 16px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
  }
  .tech-map-topbar-left {
    display: flex;
    align-items: center;
    gap: 8px;
  }
  .tech-map-dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 6px rgba(200,92,45,0.5);
  }
  .tech-map-label {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }
  .tech-map-open {
    font-family: var(--mono);
    font-size: 10px;
    color: var(--accent);
    text-decoration: none;
    letter-spacing: 0.04em;
    transition: opacity 0.15s;
  }
  .tech-map-open:hover { opacity: 0.7; }
  .tech-map-frame { height: 500px; background: #0c0c0c; display: block; }
  .tech-map-frame iframe { width: 100%; height: 100%; border: none; display: block; }
  .tech-map-mobile-cta { display: none; }

  /* ─── PAGINATION ─────────────────────────────────────── */
  .pagination { display: flex; align-items: center; justify-content: space-between; margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--border-light); flex-wrap: wrap; gap: 10px; }
  .pagination-info { font-family: var(--mono); font-size: 11px; color: var(--text-subtle); }
  .pagination-controls { display: flex; align-items: center; gap: 6px; }
  .page-btn { font-family: var(--sans); font-size: 12px; font-weight: 500; padding: 5px 11px; border: 1px solid var(--border); border-radius: 5px; background: var(--surface); color: var(--text-muted); cursor: pointer; transition: all 0.15s; }
  .page-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
  .page-btn.active { background: var(--accent); color: #fff; border-color: var(--accent); }
  .page-btn:disabled { opacity: 0.35; cursor: default; }

  /* ─── INTERESTS ───────────────────────────────────────── */
  .interests-grid { display: flex; flex-direction: column; gap: 10px; }
  .interest-card {
    background: var(--surface);
    border: 1px solid var(--border-light);
    border-left: 3px solid var(--accent);
    border-radius: 0 10px 10px 0;
    padding: 14px 18px;
  }
  .interest-card.ic-blue   { border-left-color: var(--blue); }
  .interest-card.ic-green  { border-left-color: var(--green); }
  .interest-card.ic-purple { border-left-color: #7B5EA7; }
  .interest-card.ic-orange { border-left-color: #FF6719; }
  .interest-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; }
  .interest-icon {
    width: 32px; height: 32px; border-radius: 7px; flex-shrink: 0;
    background: var(--accent-bg);
    display: flex; align-items: center; justify-content: center; font-size: 16px;
  }
  .interest-card.ic-blue   .interest-icon { background: var(--blue-bg); }
  .interest-card.ic-green  .interest-icon { background: var(--green-bg); }
  .interest-card.ic-purple .interest-icon { background: #F3F0FA; }
  .interest-card.ic-orange .interest-icon { background: #FFF4EE; }
  .interest-title {
    font-size: 11px; font-weight: 700; text-transform: uppercase;
    letter-spacing: 0.08em; color: var(--text-muted);
  }
  .interest-tags { display: flex; flex-wrap: wrap; gap: 6px; }
  .interest-tag {
    font-size: 12px; font-weight: 500; padding: 4px 12px; border-radius: 20px;
    border: 1px solid var(--border); background: var(--bg); color: var(--text-body);
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    cursor: default; text-decoration: none; display: inline-block;
  }
  .interest-tag:hover { background: var(--accent-bg); border-color: var(--accent-border); color: var(--accent); }
  a.interest-tag { cursor: pointer; }
  a.interest-tag:hover { background: #FFF4EE; border-color: #FFB899; color: #FF6719; }

  /* ─── FOOTER ──────────────────────────────────────────── */
  footer { background: var(--surface); border-top: 1px solid var(--border); padding: 24px 48px; display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--text-muted); }
  .footer-links { display: flex; gap: 24px; }
  .footer-links a { color: var(--text-muted); text-decoration: none; font-weight: 500; transition: color 0.15s; }
  .footer-links a:hover { color: var(--accent); }

  /* ─── RESPONSIVE ──────────────────────────────────────── */
  @media (max-width: 700px) {
    nav { padding: 0 20px; }
    .nav-links { display: none; }
    footer { padding: 20px; flex-direction: column; gap: 14px; text-align: center; }
    .page-wrap  { padding: 0 20px 60px; }
    .hero       { padding: 48px 0 40px; }
    .hero-layout { flex-direction: column-reverse; gap: 28px; }
    .hero-pic   { width: 100px; height: 100px; border-radius: 14px; }
    .art-meta   { min-width: 110px; padding: 12px; }
    .tl-role    { grid-template-columns: 1fr; }
    .tl-role-dates { margin-top: 2px; }
    .tl-detail  { padding: 18px; }
    .tl-scroll-wrap { display: none; }
    .tl-mobile { display: flex; flex-direction: column; gap: 10px; margin-top: 4px; }
    .tl-mobile-row {
      display: flex; align-items: center; gap: 14px;
      background: var(--surface); border: 1px solid var(--border-light);
      border-radius: 12px; padding: 12px 14px; cursor: pointer;
      transition: box-shadow 0.15s, border-color 0.15s;
    }
    .tl-mobile-row:active { box-shadow: 0 2px 10px rgba(0,0,0,0.08); }
    .tl-mobile-row.active { border-color: var(--accent); box-shadow: 0 2px 12px rgba(200,92,45,0.18); }
    .tl-mobile-accent { width: 4px; height: 40px; border-radius: 2px; flex-shrink: 0; }
    .tl-mobile-accent.nvidia { background: var(--nvidia); }
    .tl-mobile-accent.dh     { background: var(--dh); }
    .tl-mobile-accent.infrrd { background: var(--infrrd); }
    .tl-mobile-logo { width: 38px; height: 38px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); overflow: hidden; padding: 3px; flex-shrink: 0; }
    .tl-mobile-logo img { width: 100%; height: 100%; object-fit: contain; }
    .tl-mobile-info { flex: 1; min-width: 0; }
    .tl-mobile-name { font-size: 14px; font-weight: 600; color: var(--text); }
    .tl-mobile-years { font-family: var(--mono); font-size: 11px; color: var(--text-subtle); margin-top: 2px; }
    .tech-grid       { grid-template-columns: 1fr; }
    .pagination      { flex-direction: column; align-items: flex-start; }
    .tech-map-frame  { display: none; }
    .tech-map-mobile-cta { display: inline-flex; }
  }

/* ─── PUBLICATIONS: bucket labels ─────────────────────── */
.pub-bucket-label {
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted);
  margin: 20px 0 10px;
}
.pub-bucket-label:first-of-type { margin-top: 4px; }

/* ─── HERO PILLARS (Direction A) ──────────────────────── */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 28px; }
@media (max-width: 640px) { .pillars { grid-template-columns: 1fr; } }
.pillar-card {
  display: flex; flex-direction: column; gap: 6px; text-decoration: none;
  background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
  padding: 16px 18px; transition: box-shadow 0.15s, transform 0.15s, border-color 0.15s;
}
.pillar-card:hover { box-shadow: 0 4px 22px var(--shadow); transform: translateY(-2px); border-color: var(--accent-border); }
.pillar-label { font-family: var(--mono); font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); }
.pillar-count { font-family: var(--serif); font-size: 28px; font-weight: 600; color: var(--text); line-height: 1; }
.pillar-meta { font-family: var(--sans); font-size: 12px; color: var(--text-muted); }
.pillar-link { font-family: var(--sans); font-size: 11.5px; font-weight: 600; color: var(--accent); margin-top: auto; }

/* ─── PUBLICATION FLIP CARDS ──────────────────────────── */
/* one consistent thumbnail-sized grid for every bucket (books, papers, digital) */
.flip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 172px)); justify-content: start; gap: 14px; margin-bottom: 8px; }

.flipcard { perspective: 1000px; }
.flipcard-inner {
  position: relative; width: 100%; height: 100%;
  transition: transform 0.5s; transform-style: preserve-3d;
}
.flipcard.is-flipped .flipcard-inner { transform: rotateY(180deg); }
/* The front face sits in-flow so its content (2:3 cover + caption, or the title panel)
   defines the card height; the back face is absolutely overlaid. Every card in a row
   then stretches to equal height so covers line up at the top and links at the bottom. */
.flipcard-inner .flipcard-front { position: relative; height: 100%; }

.flipcard-face {
  position: absolute; inset: 0; display: flex; flex-direction: column;
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface);
  overflow: hidden; -webkit-backface-visibility: hidden; backface-visibility: hidden;
}
.flipcard-back { transform: rotateY(180deg); }
.flipcard:hover .flipcard-face { border-color: var(--accent-border); box-shadow: 0 4px 22px var(--shadow); }

.flipcard-toggle {
  flex: 1; min-height: 0; width: 100%; display: flex; flex-direction: column;
  align-items: stretch; gap: 8px; padding: 0; border: none; background: none;
  cursor: pointer; text-align: left; font: inherit; color: inherit;
}
.flipcard-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: -2px; }
.flipcard--text .flipcard-front .flipcard-toggle { padding: 14px 12px; justify-content: center; align-items: center; text-align: center; gap: 8px; }
/* a long description can exceed the card height (which is set by the front face);
   let it scroll inside the card so it never overruns the link strip below */
.flipcard-back .flipcard-toggle { padding: 14px 12px; gap: 8px; justify-content: flex-start; overflow-y: auto; overscroll-behavior: contain; scrollbar-width: thin; }

/* front: media (cover + caption) */
.flipcard-cover { width: 100%; aspect-ratio: 2 / 3; flex: none; object-fit: cover; background: var(--surface); }
.flipcard-caption { flex-shrink: 0; padding: 10px 14px; font-family: var(--serif); font-size: 14px; font-weight: 600; line-height: 1.3; color: var(--text); }

/* front: paper title panel */
.flipcard-panel-venue { font-family: var(--mono); font-size: 10px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); }
.flipcard-paneltitle { font-family: var(--serif); font-size: 13.5px; font-weight: 600; line-height: 1.32; color: var(--text); }
.flipcard-panel-cat { font-family: var(--mono); font-size: 10px; color: var(--text-muted); }
.flipcard--text.venue-arxiv .flipcard-front { background: var(--red-bg); }
.flipcard--text.venue-arxiv .flipcard-panel-venue { color: var(--red); }
.flipcard--text.venue-ssrn .flipcard-front { background: var(--blue-bg); }
.flipcard--text.venue-ssrn .flipcard-panel-venue { color: var(--blue); }

/* back: desc + meta */
.flipcard-desc { font-family: var(--sans); font-size: 12px; color: var(--text-body); line-height: 1.45; }
.flipcard-meta { font-family: var(--mono); font-size: 10.5px; color: var(--text-muted); line-height: 1.4; }
.flipcard-back .pub-self { color: var(--accent); font-weight: 600; }

/* venue link strip (both faces) */
.flipcard-link {
  flex-shrink: 0; display: flex; align-items: center; justify-content: space-between;
  padding: 9px 14px; border-top: 1px solid var(--border-light); text-decoration: none;
  font-family: var(--sans); font-size: 11.5px; font-weight: 600; color: var(--accent);
}
.flipcard-link:hover { background: var(--accent-bg); }
.venue-arxiv .flipcard-link { color: var(--red); }
.venue-arxiv .flipcard-link:hover { background: var(--red-bg); }
.venue-ssrn .flipcard-link { color: var(--blue); }
.venue-ssrn .flipcard-link:hover { background: var(--blue-bg); }

@media (prefers-reduced-motion: reduce) {
  .flipcard-inner { transform: none !important; transition: none; }
  .flipcard-face { -webkit-backface-visibility: visible; backface-visibility: visible; transition: opacity 0.1s; }
  .flipcard-back { transform: none; opacity: 0; pointer-events: none; }
  .flipcard.is-flipped .flipcard-front { opacity: 0; pointer-events: none; }
  .flipcard.is-flipped .flipcard-back { opacity: 1; pointer-events: auto; }
}