/* Layout: one 1040px column, sticky name bar, content in a readable 68ch measure;
   lists use a narrow left rail (dates, topic tags) beside the text. */
:root {
  --bg: #F5F7FA;
  --surface: #FFFFFF;
  --ink: #141B2D;
  --muted: #586179;
  --line: #DCE1EA;
  --accent: #2B47B8;
  --accent-ink: #FFFFFF;
  --accent-soft: #E8EDFB;
  --pulse: #D9480F;
  --gold: #8A5800;
  --gold-soft: #FBF1DC;

  --t-hci: #2E7D32; --t-se: #C2410C; --t-xr: #6A1B9A; --t-sec: #AD1457;
  --t-cv: #1565C0; --t-ml: #455A64; --t-xai: #00796B; --t-hpc: #5D4037;

  --display: "Newsreader", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --body: "IBM Plex Sans", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;

  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0D1120; --surface: #151B2E; --ink: #E7EAF3; --muted: #9AA3BA; --line: #262E47;
    --accent: #95A9FF; --accent-ink: #0D1120; --accent-soft: #1C2546; --pulse: #FF8A4C;
    --gold: #F0C060; --gold-soft: #2E2716;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0D1120; --surface: #151B2E; --ink: #E7EAF3; --muted: #9AA3BA; --line: #262E47;
  --accent: #95A9FF; --accent-ink: #0D1120; --accent-soft: #1C2546; --pulse: #FF8A4C;
  --gold: #F0C060; --gold-soft: #2E2716;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
:root { padding-top: env(safe-area-inset-top, 0px); padding-bottom: env(safe-area-inset-bottom, 0px); }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 5rem; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--body); font-size: 1.0625rem; line-height: 1.65;
  text-rendering: optimizeLegibility;
}
body::before {
  content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px);
  z-index: 30; background: var(--bg);
}
img { max-width: 100%; height: auto; display: block; }
[hidden] { display: none !important; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--display); font-weight: 500; line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(2.2rem, 5vw, 3.2rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.55rem, 3vw, 1.9rem); }
h3 { font-size: 1.3rem; }
p { margin: 0; }
.wrap {
  width: 100%; max-width: 1040px; margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}
.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 12px; top: 12px; z-index: 50; background: var(--surface); padding: 8px 12px; }

/* ── header ─────────────────────────────────────────── */
.site-header {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap { display: flex; align-items: center; gap: 12px 24px; flex-wrap: wrap; padding-block: 12px; }
.brand { font-family: var(--display); font-size: 1.35rem; color: var(--ink); text-decoration: none; margin-right: auto; white-space: nowrap; }
.brand:hover { color: var(--accent); }
.nav { display: flex; flex-wrap: wrap; gap: 2px 4px; align-items: center; }
.nav a {
  color: var(--muted); text-decoration: none; font-size: 0.95rem; padding: 6px 10px; border-radius: 8px;
}
.nav a:hover { color: var(--ink); background: var(--accent-soft); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 600; }
.nav a.cv { color: var(--accent-ink); background: var(--accent); font-weight: 600; margin-left: 4px; }
.nav a.cv:hover { filter: brightness(1.08); }
.theme-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--muted); border-radius: 8px;
  width: 36px; height: 36px; display: grid; place-items: center; cursor: pointer; margin-left: 4px;
}
.theme-btn:hover { color: var(--ink); }
.theme-btn svg { width: 18px; height: 18px; }

/* ── page scaffolding ────────────────────────────────── */
main { padding-block: 48px 72px; }
.page-head { display: grid; gap: 12px; margin-bottom: 40px; max-width: 68ch; }
.lede { color: var(--muted); font-size: 1.12rem; }
.section { display: grid; gap: 20px; margin-top: 56px; align-content: start; }
.section:first-child { margin-top: 0; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.section-head a { font-size: 0.95rem; }
.prose { display: grid; gap: 14px; max-width: 68ch; }
.muted { color: var(--muted); }
.small { font-size: 0.92rem; }

/* ── home hero ───────────────────────────────────────── */
.hero { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 40px; align-items: start; }
.portrait { width: 240px; aspect-ratio: 1; border-radius: 50%; object-fit: cover; background: var(--line); }
.hero-text { display: grid; gap: 16px; min-width: 0; }
.role { color: var(--muted); font-size: 1.05rem; line-height: 1.5; }
.role strong { color: var(--ink); font-weight: 600; }
.pulse { width: 100%; max-width: 420px; height: 34px; color: var(--pulse); }
.pulse polyline { stroke-dasharray: 900; stroke-dashoffset: 0; }
@media (prefers-reduced-motion: no-preference) {
  .pulse polyline { animation: trace 2.4s ease-out both; }
  @keyframes trace { from { stroke-dashoffset: 900; } to { stroke-dashoffset: 0; } }
}
.links { display: flex; flex-wrap: wrap; gap: 8px; }
.chip-link {
  display: inline-flex; align-items: center; gap: 7px; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  text-decoration: none; font-size: 0.92rem;
}
.chip-link:hover { border-color: var(--accent); color: var(--accent); }
.chip-link svg { width: 16px; height: 16px; flex: none; }
.email { font-family: var(--mono); font-size: 0.92rem; color: var(--muted); }
.email a { color: var(--ink); }

.interests { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.interests li { padding: 5px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--ink); font-size: 0.93rem; }

/* ── news ───────────────────────────────────────────── */
.news { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; }
.news li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr); gap: 16px; padding: 12px 0; border-top: 1px solid var(--line); }
.news li:last-child { border-bottom: 1px solid var(--line); }
.news time { font-family: var(--mono); font-size: 0.85rem; color: var(--muted); padding-top: 3px; font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ── two-up blocks ───────────────────────────────────── */
.split { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; }
.timeline { list-style: none; padding: 0; margin: 0; display: grid; gap: 18px; }
.timeline li { display: grid; gap: 2px; }
.timeline .when { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.timeline .what { font-weight: 600; }
.timeline .where { color: var(--muted); font-size: 0.95rem; }

/* ── topic tags & badges ─────────────────────────────── */
.tag {
  display: inline-block; min-width: 2.6em; text-align: center; padding: 1px 6px; border-radius: 5px;
  font-family: var(--mono); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.03em; color: #FFFFFF;
}
.tag-HCI { background: var(--t-hci); } .tag-SE { background: var(--t-se); } .tag-XR { background: var(--t-xr); }
.tag-SEC { background: var(--t-sec); } .tag-CV { background: var(--t-cv); } .tag-ML { background: var(--t-ml); }
.tag-XAI { background: var(--t-xai); } .tag-HPC { background: var(--t-hpc); }
.badge {
  display: inline-flex; align-items: center; gap: 5px; padding: 1px 8px; border-radius: 999px;
  border: 1px solid var(--line); color: var(--muted); font-family: var(--mono); font-size: 0.75rem; white-space: nowrap;
}
.badge.best { border-color: transparent; background: var(--gold-soft); color: var(--gold); font-weight: 600; }
.badge.status { color: var(--ink); }

/* ── publications ───────────────────────────────────── */
.pub-tools { display: grid; gap: 14px; padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); }
.stats { display: flex; flex-wrap: wrap; gap: 8px 28px; }
.stat { display: flex; align-items: baseline; gap: 8px; }
.stat b { font-family: var(--display); font-weight: 500; font-size: 1.7rem; font-variant-numeric: tabular-nums; }
.stat span { color: var(--muted); font-size: 0.93rem; }
.filters { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.filters .label { font-size: 0.88rem; color: var(--muted); margin-right: 4px; }
.filter {
  font: inherit; font-size: 0.85rem; cursor: pointer; padding: 4px 11px; border-radius: 999px;
  border: 1px solid var(--line); background: var(--bg); color: var(--ink);
}
.filter:hover { border-color: var(--accent); }
.filter[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.filter-count { font-size: 0.88rem; color: var(--muted); }
.legend { font-size: 0.88rem; color: var(--muted); }

.pubs { list-style: none; padding: 0; margin: 0; display: grid; gap: 0; counter-reset: pub; }
.pub { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 18px; padding: 16px 0; border-top: 1px solid var(--line); }
.pub:last-child { border-bottom: 1px solid var(--line); }
.pub-rail { display: flex; flex-wrap: wrap; gap: 4px; align-content: start; justify-content: flex-end; padding-top: 4px; }
.pub-body { display: grid; gap: 4px; min-width: 0; }
.pub-title { font-weight: 600; line-height: 1.4; }
.pub-authors { font-size: 0.95rem; color: var(--muted); }
.pub-authors .me { color: var(--ink); }
.pub-authors .mark { color: var(--accent); }
.pub-venue { font-size: 0.95rem; color: var(--muted); }
.pub-meta { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin-top: 4px; }
.doi {
  display: inline-flex; align-items: center; gap: 5px; padding: 1px 9px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent); font-family: var(--mono); font-size: 0.75rem;
  text-decoration: none; font-weight: 600;
}
.doi:hover { background: var(--accent); color: var(--accent-ink); }
.group-note { color: var(--muted); font-size: 0.95rem; max-width: 68ch; }

/* ── project / research cards ────────────────────────── */
.cards { display: grid; gap: 28px; }
.card {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); gap: 0;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden;
}
.card-media { background: #151D36; border-right: 1px solid var(--line); display: flex; align-items: center; }
.card-media img { width: 100%; height: auto; }
a.card-media { position: relative; text-decoration: none; }
.card-wide { grid-template-columns: minmax(0, 1fr); }
.card-wide .card-media { border-right: 0; border-bottom: 1px solid var(--line); }
.card-wide .card-body { padding: 26px 30px 28px; }
.card-wide .card-body > p { max-width: 80ch; }
.zoom {
  position: absolute; right: 10px; bottom: 10px; padding: 3px 10px; border-radius: 999px;
  background: rgba(11, 18, 32, 0.82); color: #E6EBF5; font-size: 0.8rem; opacity: 0; transition: opacity .15s;
}
a.card-media:hover .zoom, a.card-media:focus-visible .zoom { opacity: 1; }
@media (hover: none) { .zoom { opacity: 1; } }
.card-body { display: grid; gap: 12px; padding: 24px 26px; align-content: start; min-width: 0; }
.card-badges { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.card-body h2 { font-size: 1.3rem; }
.card-body ul:not(.tools) { margin: 0; padding-left: 1.15em; display: grid; gap: 4px; }
.card-people { font-size: 0.93rem; color: var(--muted); }
.card-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 8px;
  font-size: 0.92rem; font-weight: 600; text-decoration: none; border: 1px solid var(--accent);
}
.btn.primary { background: var(--accent); color: var(--accent-ink); }
.btn.ghost { color: var(--accent); background: transparent; }
.btn:hover { filter: brightness(1.08); }
.tools { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; padding: 0 !important; margin: 0; }
.tools li { font-family: var(--mono); font-size: 0.78rem; padding: 2px 8px; border-radius: 6px; background: var(--bg); border: 1px solid var(--line); color: var(--muted); }

/* ── definition lists (methods, service) ─────────────── */
.deflist { display: grid; gap: 0; margin: 0; }
.deflist > div { display: grid; grid-template-columns: 12rem minmax(0, 1fr); gap: 18px; padding: 14px 0; border-top: 1px solid var(--line); }
.deflist > div:last-child { border-bottom: 1px solid var(--line); }
.deflist dt { font-weight: 600; }
.deflist dd { margin: 0; color: var(--ink); }
.deflist dd .muted { font-size: 0.95rem; }

.plain-list { margin: 0; padding-left: 1.15em; display: grid; gap: 6px; max-width: 68ch; }
.course-list { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.course-list li { padding: 5px 12px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); font-size: 0.93rem; }

/* ── footer ─────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--line); padding-block: 28px 40px; color: var(--muted); font-size: 0.9rem; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; }
.site-footer a { color: var(--muted); }

/* ── responsive ─────────────────────────────────────── */
@media (max-width: 860px) {
  .site-header { position: static; }
  html { scroll-padding-top: 1rem; }
  .card { grid-template-columns: minmax(0, 1fr); }
  .card-media { border-right: 0; border-bottom: 1px solid var(--line); }
  .split { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 720px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .portrait { width: 168px; }
  .site-header .wrap { padding-block: 10px; }
  .brand { font-size: 1.2rem; }
  .nav { width: 100%; }
  .nav a { padding: 5px 8px; font-size: 0.9rem; }
  main { padding-block: 32px 56px; }
  .pub { grid-template-columns: minmax(0, 1fr); gap: 6px; }
  .pub-rail { justify-content: flex-start; padding-top: 0; }
  .news li { grid-template-columns: minmax(0, 1fr); gap: 2px; }
  .deflist > div { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .card-body { padding: 20px; }
}
@media print {
  .site-header, .site-footer, .pub-tools .filters { display: none; }
  body { background: #FFFFFF; color: #000000; }
}