:root {
    /* dark bluish gray palette — all greys derived from a single hue/saturation pair
       so changing --paper-h / --paper-s retints the whole UI. */
    --paper-h: 225;
    --paper-s: 10%;

    --paper:      hsl(var(--paper-h), var(--paper-s), 15%);
    --paper-2:    hsl(var(--paper-h), var(--paper-s), 18%);
    --muted-3:    hsl(var(--paper-h), var(--paper-s), 28%);
    --muted-2:    hsl(var(--paper-h), var(--paper-s), 40%);
    --muted:      hsl(var(--paper-h), var(--paper-s), 55%);
    --ink-softer: hsl(var(--paper-h), var(--paper-s), 70%);
    --ink-soft:   hsl(var(--paper-h), var(--paper-s), 80%);
    --ink:        hsl(var(--paper-h), var(--paper-s), 93%);

    --accent:     #7aa7e0;

    --sans: 'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;

    --col-label: 200px;
    --col-gap:   3rem;
    --max-width: 1080px;
    --body-size: 0.95rem;
  }

  * { box-sizing: border-box; }

  html {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
  }

  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--sans);
    font-size: var(--body-size);
    /* text-align: justify; */
    line-height: 1.65;
    font-weight: 400;
  }

  .page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: clamp(2.5rem, 6vw, 5rem) clamp(1.25rem, 4vw, 3rem) 0;
  }

  /* ========== TYPE ========== */

  h1, h2, h3, h4 { margin: 0; font-weight: 500; font-family: var(--sans); }

  a {
    color: inherit;
    text-decoration: none;
    border-bottom: 1px solid var(--muted-2);
    padding-bottom: 1px;
    transition: color 0.2s ease, border-color 0.2s ease;
  }
  a:hover { color: var(--accent); border-bottom-color: var(--accent); }

  ::selection { background: var(--ink); color: var(--paper); }

  /* ========== ROW (label + content grid) ========== */
  /* no borders; rely on whitespace alone */

  .row {
    display: grid;
    grid-template-columns: var(--col-label) 1fr;
    gap: var(--col-gap);
    padding: clamp(4rem, 7vw, 6.5rem) 0;
  }

  .row:first-of-type {
    padding-top: clamp(5rem, 10vw, 8rem);
  }

  .row .label {
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.22em;
    color: var(--muted);
    padding-top: 0.55rem;
    align-self: start;
    position: sticky;
    top: 1.5rem;
  }

  .row .content > :first-child { margin-top: 0; }
  .row .content > :last-child  { margin-bottom: 0; }

  /* ========== INTRO PANEL ========== */

  .intro-panel { align-self: stretch; position: relative; display: flex; flex-direction: column; }

  .intro-panel > div {
    display: flex;
    flex-direction: column;
    flex: 1;
  }

  .intro-panel .avatar {
    position: absolute;
    bottom: 130%;
    left: 0;
    width: 30%;
    aspect-ratio: 1 / 1;
    object-fit: cover;
    display: block;
    background: var(--paper-2);
    border-radius: 50%;
  }

  .site-name {
    font-size: clamp(1.0rem, 1.2vw, 1.4rem);
    font-weight: 600;
    letter-spacing: -0.022em;
    line-height: 1.1;
    color: var(--ink);
    margin: 0;
  }

  .site-subtitle {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--muted);
    line-height: 1.35;
    margin: 0.3rem 0 0;
  }

  /* ========== INTRO ========== */

  .lede {
    font-size: clamp(1.0rem, 1.2vw, 1.3rem);
    font-weight: 300;
    line-height: 1.5;
    color: var(--ink);
    letter-spacing: -0.015em;
    max-width: 38em;
    margin: 1.2em 0;
  }

  .lede a {
    color: var(--ink);
    border-bottom-color: var(--muted-2);
  }

  .about-link,
  .contact-link {
    display: inline-block;
    margin-top: 2rem;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
    text-decoration: none;
    border-bottom: 1px solid var(--muted-2);
    padding-bottom: 1px;
    transition: color 0.2s ease, border-color 0.2s ease;
  }
  .about-link:hover,
  .contact-link:hover { color: var(--accent); border-bottom-color: var(--accent); }

  .contact-link { margin-top: auto; align-self: flex-start; }

  .lede-meta {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
  }
  .lede-meta .dot {
    display: inline-block;
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 22%, transparent);
  }

  /* ========== COLLAPSIBLE (DETAILS / SUMMARY) ========== */
  /* no borders; lots of breathing room */

  details + details { margin-top: 2.5rem; }

  summary {
    list-style: none;
    cursor: pointer;
    padding: 0.6rem 0;
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: 1.25rem;
    align-items: baseline;
  }
  summary::-webkit-details-marker { display: none; }

  .summary-title {
    font-size: clamp(1.05rem, 1.2vw, 1.4rem);
    font-weight: 600;
    letter-spacing: -0.022em;
    line-height: 1.1;
    color: var(--ink);
    transition: color 0.2s ease;
  }

  .summary-meta {
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.14em;
    text-align: right;
    text-transform: uppercase;
    transition: color 0.2s ease;
  }

  /* +/- toggle marker */
  .marker {
    display: inline-block;
    width: 12px; height: 12px;
    position: relative;
    align-self: center;
    color: var(--muted);
    transition: color 0.2s ease;
  }
  .marker::before,
  .marker::after {
    content: '';
    position: absolute;
    background: currentColor;
    top: 50%; left: 0;
    width: 12px; height: 1.5px;
    transform-origin: center;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .marker::before { transform: translateY(-50%); }
  .marker::after  { transform: translateY(-50%) rotate(90deg); }
  details[open] .marker::after { transform: translateY(-50%) rotate(0deg); }

  summary:hover .summary-title,
  summary:hover .more-label,
  summary:hover .marker { color: var(--accent); }

  details[open] summary { padding-bottom: 1.25rem; }
  details[open] .marker { color: var(--ink); }

  .details-body { padding: 0.5rem 0 1rem; }

  /* ========== SECTION EXPAND (more/less) ========== */

  details.section-more {
    display: flex;
    flex-direction: column-reverse;
    margin-top: 3rem;
  }

  .section-more > summary {
    padding: 0.85rem 0;
    display: flex;
    align-items: center;
    gap: 0.65rem;
  }

  .more-label {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
    transition: color 0.2s ease;
  }
  .more-label::before { content: "more"; }
  .section-more[open] .more-label::before { content: "less"; }

  .section-more .talks { margin-top: 0; }
  .section-more .talks .talk:first-child { padding-top: 0; }

  /* ========== ROLES (inside Work) ========== */

  .roles { list-style: none; padding: 0; margin: 0; }

  .role-item { padding: 1.5rem 0 0; }
  .role-item + .role-item { padding-top: 3.75rem; }

  .role-head {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 1.25rem;
    align-items: baseline;
    margin-bottom: 1rem;
  }

  .role-year {
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.14em;
    text-transform: uppercase;
    padding-top: 0.15em;
  }

  .role-title {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--ink);
    letter-spacing: -0.012em;
  }

  .role-detail {
    display: grid;
    grid-template-columns: 130px 1fr;
    gap: 0.7rem 1.25rem;
    margin-top: 0.5rem;
  }
  .role-detail dt {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.16em;
    color: var(--muted);
    font-weight: 500;
    padding-top: 0.3em;
  }
  .role-detail dd {
    margin: 0;
    color: var(--ink-softer);
    font-size: var(--body-size);
    line-height: 1.65;
  }
  .role-detail dd p {
    margin: 0.5em 0 0;
  }

  /* ========== PROJECT BODY ========== */

  .project-body p {
    margin: 0 0 0.9rem;
    color: var(--ink-softer);
    max-width: 42em;
  }
  .project-result {
    font-size: 0.85rem;
    color: var(--ink);
    margin-top: 1.1rem !important;
    margin-bottom: 0 !important;
    letter-spacing: 0.005em;
  }
  .project-result::before {
    content: "→";
    margin-right: 0.6em;
    color: var(--accent);
  }

  .project-tags,
  .talk-tags,
  .label-tags,
  .role-tags {
    list-style: none;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .project-tags { margin: 1.25rem 0 0; }
  .talk-tags    { margin: 1.1rem 0 0; }
  .label-tags   { margin: 1.5rem 0 0; }
  .role-tags    { margin: 0; }

  .project-tags li,
  .talk-tags li,
  .label-tags li,
  .role-tags li {
    font-size: 0.55rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
    font-weight: 500;
    border: 1px solid var(--muted-3);
    border-radius: 999px;
    padding: 0.3em 0.85em;
    cursor: default;
    transition: color 0.2s ease, border-color 0.2s ease;
  }
  .project-tags li:hover,
  .talk-tags li:hover,
  .label-tags li:hover,
  .role-tags li:hover {
    color: var(--accent);
    border-color: var(--accent);
  }

  .summary-meta .pip {
    display: inline-block;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--accent);
    margin-right: 0.5em;
    transform: translateY(-1px);
  }

  /* ========== SPEAKING ========== */

  .speaking-stat {
    font-size: clamp(2.25rem, 5vw, 3.25rem);
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1;
    margin: 0 0 0.5rem;
    color: var(--ink);
  }
  .speaking-stat .lbl {
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--muted);
    display: inline-block;
    margin-left: 0.6em;
    transform: translateY(-0.4em);
  }

  .talks {
    list-style: none;
    padding: 0;
    margin: 2.5rem 0 0;
  }
  .talk {
    padding: 1.75rem 0;
    display: grid;
    grid-template-columns: 200px 1fr;
    column-gap: 1.5rem;
    align-items: start;
  }
  .talk:first-child { padding-top: 0; }

  /* right column: title/note/tags stack beside the thumb */
  .talk-body { min-width: 0; }

  /* talk thumbnail (YouTube thumbnail) with centered play icon */
  .talk-thumb {
    position: relative;
    aspect-ratio: 4 / 3;
    background: var(--paper-2);
    border: 1px solid var(--muted-3);
    border-radius: 4px;
    overflow: hidden;
  }
  .talk-thumb a {
    display: block;
    width: 100%;
    height: 100%;
    border: none;
    padding: 0;
  }
  .talk-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: left center; /* crop only the right side */
    display: block;
  }
  .play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1.5px solid var(--ink);
    background: color-mix(in srgb, var(--paper) 45%, transparent);
    display: grid;
    place-items: center;
    transition: border-color 0.2s ease, background 0.2s ease;
  }
  .play-icon::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 7px 0 7px 12px;
    border-color: transparent transparent transparent var(--ink);
    margin-left: 3px; /* optical centering of the triangle */
    transition: border-left-color 0.2s ease;
  }
  .talk-thumb:hover .play-icon { border-color: var(--accent); }
  .talk-thumb:hover .play-icon::after { border-left-color: var(--accent); }

  .talk-head {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 1rem;
    align-items: baseline;
    margin-bottom: 0.55rem;
  }
  .talk-title {
    font-size: 1.05rem;
    font-weight: 500;
    letter-spacing: -0.012em;
    border-bottom: none;
  }
  .talk-title:hover { color: var(--accent); }
  .talk-views {
    font-size: 0.78rem;
    color: var(--muted);
    letter-spacing: 0.04em;
    white-space: nowrap;
  }
  .talk-views .n { color: var(--ink); font-weight: 500; }
  .talk-note {
    margin: 0;
    color: var(--ink-softer);
    font-size: var(--body-size);
    max-width: 42em;
  }

  /* ========== ABOUT ========== */

  .prose p {
    color: var(--ink-soft);
    max-width: 36em;
    margin: 0 0 1.3rem;
    font-size: 1.02rem;
    font-weight: 300;
    line-height: 1.7;
  }
  .prose p:last-child { margin-bottom: 0; }

  .about-teaser {
    position: relative;
    max-height: 5em;
    overflow: hidden;
  }
  .about-teaser::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 0%, var(--paper) 100%);
    pointer-events: none;
  }
  #about:has(.section-more[open]) .about-teaser { display: none; }
  #about .section-more[open] { margin-top: 0; }

  /* ========== CONTACT ========== */

  .contact {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 0.85rem 1.5rem;
  }
  .contact dt {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--muted);
    font-weight: 500;
    padding-top: 0.25em;
  }
  .contact dd {
    margin: 0;
    font-size: var(--body-size);
  }

  /* ========== FOOTER ========== */

  footer {
    margin-top: 4rem;
    padding: 3rem 0 4rem;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    font-size: 0.72rem;
    color: var(--muted);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-weight: 500;
  }

  /* ========== MOTION ========== */

  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: translateY(0); }
  }

  @media (prefers-reduced-motion: no-preference) {
    .row, footer {
      animation: fadeUp 0.7s cubic-bezier(0.2, 0.65, 0.3, 1) backwards;
    }
    .row:nth-of-type(1) { animation-delay: 0.05s; }
    .row:nth-of-type(2) { animation-delay: 0.12s; }
    .row:nth-of-type(3) { animation-delay: 0.19s; }
    .row:nth-of-type(4) { animation-delay: 0.26s; }
    .row:nth-of-type(5) { animation-delay: 0.33s; }
    .row:nth-of-type(6) { animation-delay: 0.40s; }
    footer              { animation-delay: 0.47s; }
  }

  /* ========== RESPONSIVE ========== */

  @media (max-width: 760px) {
    .row {
      grid-template-columns: 1fr;
      gap: 1rem;
      padding: 3rem 0;
    }
    .row .label {
      position: static;
      padding-top: 0;
    }
    .intro-panel .avatar {
      position: static;
      width: 64px;
      margin-bottom: 0.75rem;
    }
    summary {
      grid-template-columns: 1fr auto;
      grid-template-areas:
        "title  marker"
        "meta   meta";
      gap: 0.5rem 1rem;
    }
    .summary-title { grid-area: title; }
    .summary-meta  { grid-area: meta; text-align: left; }
    .marker        { grid-area: marker; }
    .role-head { grid-template-columns: 1fr; gap: 0.25rem; }
    .role-detail { grid-template-columns: 80px 1fr; gap: 0.4rem 0.85rem; }
    .contact { grid-template-columns: 80px 1fr; }
    .talk { grid-template-columns: 120px 1fr; column-gap: 1rem; }
    .talk-head { grid-template-columns: 1fr; gap: 0.25rem; }
    .play-icon { width: 38px; height: 38px; }
    .play-icon::after { border-width: 6px 0 6px 10px; }
  }