/* ============================================================
   Tangen Lab — site styles (Direction B / Institute)
   ============================================================ */

:root {
  --bg: #ffffff;
  --panel: #f4f4f1;
  --ink: #0a0a0a;
  --ink-2: #2a2a28;
  --ink-3: #6b6b66;
  --ink-4: #a8a8a0;
  --rule: #1a1a1a;
  --rule-soft: #d8d8d2;
  --accent: #ff5e3a;
  --accent-ink: #d8442a;
  --sans: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: 'ss01', 'cv11';
}
a { color: inherit; text-decoration: none; }
.mono { font-family: var(--mono); }
img { max-width: 100%; display: block; }

/* ============================================================
   Accessibility: focus, skip link, reduced motion
   ============================================================ */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.skip {
  position: absolute;
  left: 8px;
  top: -60px;
  z-index: 100;
  background: var(--ink);
  color: var(--bg);
  padding: 0.6rem 1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  border-radius: 4px;
  transition: top 0.15s;
}
.skip:focus { top: 8px; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.wrap {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================================
   Top bar
   ============================================================ */
.topbar {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar .row {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  height: 56px;
  gap: 2rem;
}
.topbar .logo {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-right: 1px solid var(--rule-soft);
  height: 100%;
  display: flex;
  align-items: center;
}
.topbar .brand {
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.02em;
}
.topbar .brand .dot {
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--accent);
  margin-right: 8px;
  transform: translateY(-1px);
}
.topbar nav ul {
  display: flex;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.78rem;
}
.topbar nav a {
  padding: 0 1.25rem;
  color: var(--ink-2);
  border-left: 1px solid var(--rule-soft);
  height: 56px;
  display: flex;
  align-items: center;
  transition: background 0.15s, color 0.15s;
}
.topbar nav a:hover { background: var(--ink); color: var(--bg); }
.topbar nav a.active {
  color: var(--ink);
  font-weight: 500;
  position: relative;
}
.topbar nav a.active::after {
  content: '';
  position: absolute;
  left: 1.25rem; right: 1.25rem;
  bottom: 14px;
  height: 2px;
  background: var(--accent);
}
.topbar nav a.cta {
  background: var(--ink);
  color: var(--bg);
}
.topbar nav a.cta:hover { background: var(--accent); }
.topbar nav .num { color: var(--ink-3); margin-right: 0.5rem; }

/* ============================================================
   Page hero (sub-pages)
   ============================================================ */
.page-hero {
  padding: 5rem 0 3.5rem;
  border-bottom: 1px solid var(--rule);
}
.page-hero .grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 4rem;
  align-items: end;
}
.page-hero .crumb {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  margin-bottom: 1rem;
}
.page-hero .crumb .n { color: var(--accent); margin-right: 0.5rem; }
.page-hero h1 {
  font-size: clamp(2.4rem, 5vw, 4.6rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.98;
  margin: 0;
  text-wrap: balance;
  max-width: 14ch;
}
.page-hero h1 em {
  font-style: normal;
  color: var(--accent);
}
.page-hero .lede {
  padding-bottom: 0.4rem;
}
.page-hero .lede p {
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0 0 1rem;
  max-width: 42ch;
}
.page-hero .lede .meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  line-height: 1.7;
  margin-top: 1rem;
}

/* ============================================================
   Home hero (index/home)
   ============================================================ */
.hero {
  position: relative;
  padding: 5rem 0 4rem;
  border-bottom: 1px solid var(--rule);
}
.hero .grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 4rem;
  align-items: start;
}
.hero h1 {
  font-size: clamp(2.2rem, 4.4vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.0;
  margin: 0;
  text-wrap: balance;
  max-width: 16ch;
}
.hero h1 .ai { color: var(--accent); }
.hero h1 .dot { color: var(--accent); }
.hero .lede {
  align-self: start;
  padding-top: 0.5rem;
}
.hero .lede p {
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink-2);
  margin: 0 0 1.25rem;
  max-width: 38ch;
}
.hero .lede .meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
  letter-spacing: 0.03em;
  line-height: 1.7;
}
.hero .lede .meta a { border-bottom: 1px solid var(--ink); color: var(--ink); }

/* ============================================================
   Generic section
   ============================================================ */
.sec {
  border-bottom: 1px solid var(--rule-soft);
  padding: 5rem 0;
}
.sec-head {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
  align-items: end;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
}
.sec-head h2 {
  font-size: clamp(1.6rem, 2.6vw, 2.4rem);
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0;
  max-width: 22ch;
  grid-column: 1;
  grid-row: 2;
}
.sec-head .tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  grid-column: 1 / -1;
  grid-row: 1;
  align-self: start;
  margin-bottom: 0.75rem;
}
.sec-head .tag .n {
  color: var(--accent);
  margin-right: 0.5rem;
}
.sec-head .more {
  grid-column: 2;
  grid-row: 2;
  justify-self: end;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule-soft);
  padding-bottom: 2px;
}
.sec-head .more:hover { color: var(--ink); border-color: var(--ink); }

/* ============================================================
   Home: Featured cards
   ============================================================ */
.feat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--rule-soft);
  border: 1px solid var(--rule-soft);
}
.feat-card {
  background: var(--bg);
  padding: 2rem;
  position: relative;
  transition: background 0.2s;
}
.feat-card:hover { background: var(--panel); }
.feat-card .ix {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}
.feat-card h3 {
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  margin: 0 0 0.5rem;
}
.feat-card .deck {
  font-size: 1rem;
  color: var(--ink-2);
  margin: 0 0 1rem;
  font-weight: 400;
  line-height: 1.45;
}
.feat-card .body {
  font-size: 0.92rem;
  color: var(--ink-3);
  line-height: 1.55;
  margin: 0 0 1.5rem;
}
.feat-card .row-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.feat-card .row-links a {
  font-family: var(--mono);
  font-size: 0.75rem;
  border: 1px solid var(--rule);
  padding: 0.45rem 0.85rem;
  transition: all 0.15s;
}
.feat-card .row-links a:hover { background: var(--ink); color: var(--bg); }
.feat-card .row-links a.primary {
  background: var(--ink);
  color: var(--bg);
}
.feat-card .row-links a.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* visuals */
.feat-vis {
  aspect-ratio: 16 / 9;
  background: var(--panel);
  margin-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--rule-soft);
}
.feat-vis img { width: 100%; height: 100%; object-fit: cover; }
.feat-vis.classbuild {
  background: var(--ink);
  color: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background-image: linear-gradient(135deg, transparent 49%, rgba(255,255,255,0.04) 49%, rgba(255,255,255,0.04) 51%, transparent 51%);
  background-size: 14px 14px;
}
.feat-vis.classbuild .demo {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 0.5rem;
  width: 100%;
  max-width: 320px;
  font-family: var(--mono);
  font-size: 0.7rem;
}
.feat-vis.classbuild .demo > div {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  padding: 0.5rem;
  line-height: 1.3;
  overflow: hidden;
}
.feat-vis.classbuild .demo .chap { color: var(--accent); }
.feat-vis.think {
  background: linear-gradient(180deg, #2a2a28 0%, #0a0a0a 100%);
  color: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.feat-vis.think .play {
  width: 50px; height: 50px;
  border: 1.5px solid #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 1rem;
  position: relative;
}
.feat-vis.think .play::after {
  content: '';
  width: 0; height: 0;
  border-left: 14px solid #fff;
  border-top: 8px solid transparent;
  border-bottom: 8px solid transparent;
  margin-left: 4px;
}
.feat-vis.think .lbl {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  opacity: 0.7;
}
.feat-vis.think .big {
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-top: 0.3rem;
}
.feat-vis.think { transition: background 0.25s; }
a.feat-vis.think:hover { background: linear-gradient(180deg, #34332f 0%, #0a0a0a 100%); }
a.feat-vis.think:hover .play { border-color: var(--accent); }
a.feat-vis.think:hover .play::after { border-left-color: var(--accent); }

/* ============================================================
   Research table (home + research page)
   ============================================================ */
.res-table {
  border-top: 1px solid var(--rule);
}
.res-table .row {
  display: grid;
  grid-template-columns: 80px 1fr 1.5fr 200px;
  gap: 2rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--rule-soft);
  align-items: start;
  transition: background 0.2s;
}
.res-table .row.link { cursor: pointer; }
.res-table .row:hover { background: var(--panel); }
.res-table .row:hover h3 { color: var(--accent); }
.res-table .n {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
  padding-top: 0.5rem;
}
.res-table h3 {
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 0;
  transition: color 0.15s;
}
.res-table p {
  font-size: 0.95rem;
  color: var(--ink-3);
  line-height: 1.5;
  margin: 0;
}
.res-table .pulls {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-3);
  line-height: 1.7;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.res-table .pulls .k { color: var(--ink); }

/* ============================================================
   Long research entries (Research page)
   ============================================================ */
.research-entry {
  display: grid;
  grid-template-columns: 80px 1fr 1.5fr;
  gap: 3rem;
  padding: 3rem 0;
  border-bottom: 1px solid var(--rule-soft);
  align-items: start;
}
.research-entry:last-child { border-bottom: none; }
.research-entry .n {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
  padding-top: 0.5rem;
}
.research-entry .n .accent { color: var(--accent-ink); }
.research-entry .lhs h3 {
  font-size: 1.7rem;
  font-weight: 500;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0 0 1rem;
}
.research-entry .lhs .partners {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-top: 1px solid var(--rule-soft);
  padding-top: 1rem;
  margin-top: 1.5rem;
  line-height: 1.7;
}
.research-entry .lhs .partners .k { color: var(--ink); }
.research-entry .rhs p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0 0 1rem;
}
.research-entry .rhs p:last-child { margin-bottom: 0; }

/* ============================================================
   Publications list
   ============================================================ */
.papers ol {
  list-style: none;
  padding: 0;
  margin: 0;
}
.papers li {
  display: grid;
  grid-template-columns: 80px 1fr 100px 100px;
  gap: 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--rule-soft);
  align-items: baseline;
  font-size: 0.92rem;
}
.papers li:last-child { border-bottom: 1px solid var(--rule-soft); }
.papers .yr {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink);
  font-weight: 500;
}
.papers .ttl {
  line-height: 1.55;
  color: var(--ink);
}
.papers .ttl .auth {
  color: var(--ink-3);
  font-size: 0.85rem;
  display: block;
  margin-top: 0.2rem;
  font-family: var(--mono);
}
.papers .venue {
  font-style: italic;
  color: var(--ink-3);
  font-size: 0.85rem;
}
.papers .pdf {
  text-align: right;
  font-family: var(--mono);
  font-size: 0.72rem;
}
.papers .pdf a {
  border: 1px solid var(--rule);
  padding: 0.3rem 0.6rem;
  display: inline-block;
}
.papers .pdf a:hover { background: var(--ink); color: var(--bg); }

/* filter chips (publications) */
.pub-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.5rem;
}
.pub-filters button {
  appearance: none;
  background: var(--bg);
  border: 1px solid var(--rule-soft);
  color: var(--ink-2);
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 0.4rem 0.85rem;
  cursor: pointer;
  text-transform: none;
  letter-spacing: 0.08em;
  transition: all 0.15s;
}
.pub-filters button:hover { border-color: var(--ink); }
.pub-filters button.on {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}
.pub-filters .count {
  margin-left: 0.4rem;
  color: var(--ink-3);
}
.pub-filters button.on .count { color: rgba(255,255,255,0.55); }

/* ============================================================
   Lab band (with photo)
   ============================================================ */
.lab-band {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--ink);
  color: var(--bg);
}
.lab-band .inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 4rem 2rem;
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 3rem;
  align-items: center;
}
.lab-band .copy h3 {
  font-size: 2rem;
  font-weight: 500;
  letter-spacing: -0.03em;
  margin: 0 0 1rem;
  line-height: 1.1;
}
.lab-band .copy p {
  color: #bdbdb8;
  font-size: 0.95rem;
  line-height: 1.55;
  margin: 0 0 1.5rem;
  max-width: 36ch;
}
.lab-band .copy .tag {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #888884;
  margin-bottom: 1rem;
}
.lab-band .copy .tag .n { color: var(--accent); margin-right: 0.5rem; }
.lab-band img {
  width: 100%;
  border: 1px solid rgba(255,255,255,0.1);
  filter: grayscale(0.3);
}
.lab-band .copy a.btn {
  font-family: var(--mono);
  font-size: 0.78rem;
  border: 1px solid #fff;
  padding: 0.55rem 1rem;
  display: inline-block;
}
.lab-band .copy a.btn:hover { background: var(--accent); border-color: var(--accent); }

/* ============================================================
   People — bio + lists
   ============================================================ */
.bio {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 4rem;
  padding: 4rem 0 5rem;
  border-bottom: 1px solid var(--rule);
}
.bio .portrait {
  position: relative;
}
.bio .portrait img {
  width: 100%;
  border: 1px solid var(--rule);
  filter: grayscale(0.15);
}
.bio .portrait .caption {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-top: 0.75rem;
  display: flex;
  justify-content: space-between;
}
.bio .portrait .caption .accent { color: var(--accent); }
.bio .copy h2 {
  font-size: clamp(2rem, 3.6vw, 3rem);
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin: 0 0 1.5rem;
}
.bio .copy p {
  font-size: 1.02rem;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 1.25rem;
  max-width: 60ch;
}
.bio .copy .bio-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.bio .copy .bio-links a {
  font-family: var(--mono);
  font-size: 0.75rem;
  border: 1px solid var(--rule);
  padding: 0.5rem 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.bio .copy .bio-links a:hover { background: var(--ink); color: var(--bg); }
.bio .copy .bio-links a:hover img { filter: invert(1); }
.bio .copy .bio-links img { width: 14px; height: 14px; }

/* student lists */
.students {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}
.students.alumni { grid-template-columns: repeat(3, 1fr); }
.student-card {
  border: 1px solid var(--rule-soft);
  padding: 1.25rem;
  transition: all 0.15s;
  background: var(--bg);
}
.student-card:hover {
  border-color: var(--ink);
  transform: translateY(-2px);
}
.student-card .photo {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--panel);
  margin-bottom: 1rem;
  overflow: hidden;
  filter: grayscale(0.3);
}
.student-card .photo img { width: 100%; height: 100%; object-fit: cover; }
.student-card .nm {
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.01em;
  margin-bottom: 0.3rem;
  color: var(--ink);
}
.student-card .nm a { color: inherit; border-bottom: 1px solid var(--rule-soft); padding-bottom: 1px; }
.student-card .nm a:hover { color: var(--accent); border-color: var(--accent); }
.student-card .yr {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}
.student-card .yr .accent { color: var(--accent-ink); }
.student-card .topic {
  font-size: 0.85rem;
  color: var(--ink-2);
  line-height: 1.45;
}
.student-card .topic a { color: inherit; border-bottom: 1px solid var(--rule-soft); }
.student-card .topic a:hover { color: var(--accent); border-color: var(--accent); }

/* Honours — denser flat list */
.honours {
  border-top: 1px solid var(--rule);
}
.honours .row {
  display: grid;
  grid-template-columns: 60px 200px 1fr;
  gap: 2rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule-soft);
  align-items: baseline;
  font-size: 0.92rem;
}
.honours .yr {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent-ink);
  font-weight: 500;
}
.honours .nm { font-weight: 500; color: var(--ink); }
.honours .topic { color: var(--ink-3); line-height: 1.5; }

/* ============================================================
   Teaching / Services — content blocks
   ============================================================ */
.block {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 4rem;
  padding: 4rem 0;
  border-bottom: 1px solid var(--rule-soft);
  align-items: start;
}
.block:last-of-type { border-bottom: none; }
.block.flip { grid-template-columns: 1.4fr 1fr; }
.block.flip .visual { order: 2; }
.block .visual img {
  width: 100%;
  border: 1px solid var(--rule-soft);
}
.block .visual .vcap {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin-top: 0.75rem;
  display: flex;
  justify-content: space-between;
}
.block .visual .vcap .accent { color: var(--accent); }
.block .copy .ix {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  margin-bottom: 0.75rem;
  display: flex;
  gap: 1rem;
  align-items: center;
}
.block .copy .ix .n { color: var(--accent); }
.block .copy h3 {
  font-size: clamp(1.5rem, 2.4vw, 2.2rem);
  font-weight: 500;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0 0 0.5rem;
}
.block .copy .tagline {
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--ink-2);
  margin: 0 0 1.25rem;
  font-style: italic;
}
.block .copy .code {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 1.25rem;
  padding: 0.4rem 0;
  border-top: 1px solid var(--rule-soft);
  border-bottom: 1px solid var(--rule-soft);
}
.block .copy p {
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 1rem;
  max-width: 56ch;
}
.block .copy ul.checked {
  padding: 0;
  margin: 1rem 0 1.5rem;
  list-style: none;
}
.block .copy ul.checked li {
  padding: 0.55rem 0 0.55rem 1.75rem;
  border-bottom: 1px dashed var(--rule-soft);
  font-size: 0.95rem;
  color: var(--ink-2);
  position: relative;
  line-height: 1.5;
}
.block .copy ul.checked li::before {
  content: '→';
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.8rem;
  position: absolute;
  left: 0;
  top: 0.7rem;
}
.block .copy ul.checked li em {
  font-style: italic;
  color: var(--ink);
}
.block .copy .row-links {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}
.block .copy .row-links a {
  font-family: var(--mono);
  font-size: 0.78rem;
  border: 1px solid var(--rule);
  padding: 0.5rem 0.9rem;
  transition: all 0.15s;
}
.block .copy .row-links a:hover { background: var(--ink); color: var(--bg); }
.block .copy .row-links a.primary { background: var(--ink); color: var(--bg); }
.block .copy .row-links a.primary:hover { background: var(--accent); border-color: var(--accent); }

/* ============================================================
   Footer
   ============================================================ */
footer.site {
  border-top: 1px solid var(--rule);
  padding: 4rem 0 2rem;
  background: var(--bg);
}
footer.site .grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
}
footer.site h4 {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  margin: 0 0 1rem;
}
footer.site .bigmark {
  font-size: 2.8rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
  margin: 0 0 0.5rem;
}
footer.site .bigmark .dot {
  display: inline-block;
  width: 14px; height: 14px;
  background: var(--accent);
  margin-right: 10px;
  transform: translateY(-4px);
}
footer.site .bigmark span.sub {
  display: block;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--ink-3);
  letter-spacing: 0;
  margin-top: 0.4rem;
  font-family: var(--mono);
}
footer.site ul { list-style: none; padding: 0; margin: 0; }
footer.site li { padding: 0.3rem 0; font-size: 0.9rem; }
footer.site li a:hover { color: var(--accent); }
footer.site .legal {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule-soft);
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-3);
}

/* Services spec card (replaces stock photos) */
.spec {
  background-color: var(--ink);
  background-image:
    linear-gradient(155deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0) 42%),
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(255,255,255,0.028) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(255,255,255,0.028) 23px 24px);
  color: var(--bg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  position: relative;
  aspect-ratio: 4 / 5;
  min-height: 360px;
  border-top: 2px solid var(--accent);
  box-shadow: 0 22px 45px -30px rgba(0,0,0,0.55);
}
.spec.light {
  background-color: var(--panel);
  background-image:
    linear-gradient(155deg, rgba(255,255,255,0.75) 0%, rgba(255,255,255,0) 48%),
    repeating-linear-gradient(0deg, transparent 0 23px, rgba(10,10,10,0.04) 23px 24px),
    repeating-linear-gradient(90deg, transparent 0 23px, rgba(10,10,10,0.04) 23px 24px);
  color: var(--ink);
  border: 1px solid var(--rule-soft);
  border-top: 2px solid var(--accent);
  box-shadow: 0 22px 45px -32px rgba(0,0,0,0.22);
}
.spec .hd {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-4);
  padding-bottom: 0.75rem;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.spec.light .hd { color: var(--ink-3); border-bottom-color: var(--rule-soft); }
.spec .hd .n { color: var(--accent); }
.spec .display {
  font-size: 4.5rem;
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.95;
  margin: 0.5rem 0 0;
  font-variant-numeric: tabular-nums;
}
.spec .display .unit {
  font-size: 1.4rem;
  letter-spacing: 0;
  color: var(--ink-4);
  margin-left: 0.4rem;
  font-weight: 400;
  font-family: var(--mono);
}
.spec.light .display .unit { color: var(--ink-3); }
.spec .display .arrow {
  color: var(--accent);
  font-weight: 400;
}
.spec dl {
  margin: auto 0 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.5rem 1.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
}
.spec dt {
  color: var(--ink-4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  padding-top: 0.2rem;
}
.spec.light dt { color: var(--ink-3); }
.spec dd {
  margin: 0;
  color: #ddd;
  line-height: 1.45;
}
.spec.light dd { color: var(--ink); }
.spec dd em { color: var(--accent); font-style: normal; }

/* ============================================================
   Services — partner tiles (inside lab-band)
   ============================================================ */
.partner-tiles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.1);
}
.partner-tile {
  background: var(--ink);
  padding: 1.5rem;
}
.partner-tile .who {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #888884;
  margin-bottom: 0.5rem;
}
.partner-tile .what {
  font-size: 0.95rem;
  color: #ddd;
  line-height: 1.45;
}

/* ============================================================
   Hamburger nav toggle (mobile)
   ============================================================ */
.hamburger {
  display: none;
  appearance: none;
  background: var(--bg);
  border: 1px solid var(--rule-soft);
  border-radius: 6px;
  width: 40px;
  height: 36px;
  padding: 0;
  cursor: pointer;
  position: relative;
  -webkit-tap-highlight-color: transparent;
}
.hamburger span {
  position: absolute;
  left: 9px;
  width: 22px;
  height: 1.5px;
  background: var(--ink);
  border-radius: 1px;
  transition: transform 0.2s ease, opacity 0.15s, top 0.2s ease;
}
.hamburger span:nth-child(1) { top: 12px; }
.hamburger span:nth-child(2) { top: 17px; }
.hamburger span:nth-child(3) { top: 22px; }
.hamburger.open span:nth-child(1) { top: 17px; transform: rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { top: 17px; transform: rotate(-45deg); }

/* ============================================================
   MOBILE & TABLET
   ============================================================ */
@media (max-width: 900px) {
  .wrap { padding: 0 1.5rem; }

  /* —— Topbar: brand + hamburger only —— */
  .topbar .row {
    grid-template-columns: 1fr auto;
    gap: 1rem;
    padding-right: 0;
  }
  .topbar .brand { font-size: 0.95rem; }
  .topbar .brand .subtitle { display: none; }
  .hamburger { display: block; }

  /* nav becomes a dropdown panel */
  .topbar nav {
    display: none;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
    box-shadow: 0 12px 28px -18px rgba(0,0,0,0.25);
  }
  .topbar.open nav { display: block; }
  .topbar nav ul { flex-direction: column; padding: 0; }
  .topbar nav a {
    border-left: none;
    border-top: 1px solid var(--rule-soft);
    width: 100%;
    padding: 0 1.5rem;
    height: 54px;
    font-size: 0.82rem;
  }
  .topbar nav a:hover { background: transparent; color: var(--ink); }
  .topbar nav a.cta { background: var(--ink); color: var(--bg); }
  .topbar nav a.active::after {
    left: 1.5rem; right: auto;
    width: 24px; bottom: 18px;
  }

  /* —— Heroes —— */
  .hero, .page-hero { padding: 3rem 0 2.5rem; }
  .hero .grid, .page-hero .grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
    align-items: start;
  }
  .hero h1, .page-hero h1 {
    font-size: clamp(2rem, 8.5vw, 3.4rem);
    max-width: none;
    line-height: 1.05;
  }
  .hero .lede, .page-hero .lede { padding-top: 0; padding-bottom: 0; }
  .hero .lede p, .page-hero .lede p { max-width: none; font-size: 1rem; }

  /* —— Section heads —— */
  .sec { padding: 3.5rem 0; }
  .sec-head {
    grid-template-columns: 1fr;
    gap: 0.5rem;
    margin-bottom: 2rem;
    padding-bottom: 0.75rem;
  }
  .sec-head h2 {
    font-size: clamp(1.4rem, 5.5vw, 2rem);
    max-width: none;
    grid-column: 1;
    grid-row: 2;
  }
  .sec-head .more {
    grid-column: 1;
    grid-row: 3;
    justify-self: start;
    margin-top: 0.75rem;
    font-size: 0.7rem;
  }

  /* —— Featured cards —— */
  .feat-grid { grid-template-columns: 1fr; }
  .feat-card { padding: 1.5rem; }
  .feat-card h3 { font-size: 1.5rem; }
  .feat-vis.classbuild { padding: 0; }
  .feat-vis.classbuild .demo { font-size: 0.65rem; grid-template-columns: 52px 1fr; }
  .feat-vis.think .big { font-size: 1.3rem; padding: 0 1rem; }

  /* —— Research table (home + research) —— */
  .res-table .row,
  .res-table a.row {
    display: block !important;
    padding: 1.5rem 0;
  }
  .res-table .n {
    padding-top: 0;
    margin-bottom: 0.4rem;
    color: var(--accent);
  }
  .res-table h3 { font-size: 1.2rem; margin-bottom: 0.6rem; }
  .res-table p { margin-bottom: 0.9rem; }
  .res-table .pulls {
    border-top: 1px solid var(--rule-soft);
    padding-top: 0.75rem;
    margin-top: 0.5rem;
  }

  /* —— Research entries (Research page) —— */
  .research-entry {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    padding: 2.5rem 0;
  }
  .research-entry .n { margin-bottom: -0.4rem; }
  .research-entry .lhs h3 { font-size: 1.4rem; }

  /* —— Publications —— */
  .papers li {
    grid-template-columns: 56px 1fr;
    gap: 0.5rem 1rem;
    padding: 1.25rem 0;
  }
  .papers .venue, .papers .pdf {
    grid-column: 2;
    text-align: left;
  }
  .papers .pdf { margin-top: 0.4rem; }
  .pub-filters button { padding: 0.4rem 0.7rem; font-size: 0.7rem; }

  /* —— Bio —— */
  .bio {
    grid-template-columns: 1fr;
    gap: 1.75rem;
    padding: 3rem 0 4rem;
  }
  .bio .portrait { max-width: 240px; }
  .bio .copy h2 { font-size: clamp(1.8rem, 7vw, 2.5rem); }
  .bio .copy p { font-size: 1rem; }

  /* —— Student cards —— */
  .students,
  .students.alumni {
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
  }
  .student-card { padding: 1rem; }
  .student-card .photo { width: 44px; height: 44px; margin-bottom: 0.75rem; }

  /* —— Honours —— */
  .honours .row {
    grid-template-columns: 56px 1fr;
    gap: 0.4rem 1rem;
    padding: 0.85rem 0;
  }
  .honours .topic {
    grid-column: 2;
    font-size: 0.86rem;
    margin-top: 0.15rem;
  }

  /* —— Blocks (teaching / services) —— */
  .block, .block.flip {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 3rem 0;
  }
  .block.flip .visual { order: 0; }
  .block .copy h3 { font-size: 1.5rem; }
  .block .copy .row-links a { font-size: 0.72rem; padding: 0.45rem 0.7rem; }
  .block .copy ul.checked li { font-size: 0.92rem; }

  /* —— Spec cards (services) —— */
  .spec { aspect-ratio: auto; min-height: 280px; padding: 1.5rem; }
  .spec .display { font-size: 3rem; }
  .spec .display .unit { font-size: 1rem; }
  .spec dl { gap: 0.4rem 1rem; }

  /* —— Lab band —— */
  .lab-band .inner {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.5rem;
  }
  .lab-band .copy h3 { font-size: 1.5rem; }

  /* —— Footer —— */
  footer.site { padding: 3rem 0 2rem; }
  footer.site .grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
  footer.site .bigmark { font-size: 2.2rem; }
  footer.site .legal {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .wrap { padding: 0 1.25rem; }

  .hero h1, .page-hero h1 {
    font-size: clamp(1.85rem, 8vw, 2.4rem);
  }

  .students, .students.alumni { grid-template-columns: 1fr; gap: 0.6rem; }

  footer.site .grid { grid-template-columns: 1fr; gap: 1.5rem; }

  .honours .row {
    grid-template-columns: 50px 1fr;
    font-size: 0.85rem;
  }

  .partner-tiles { grid-template-columns: 1fr; }

  .spec .display { font-size: 2.4rem; }
  .spec dt { font-size: 0.62rem; }
  .spec dd { font-size: 0.78rem; }

  .topbar .brand { font-size: 0.88rem; }
}