/* =========================================================
   |Quantum⟩ Lab — design tokens
   ========================================================= */
:root{
  /* color */
  --paper:      #eef0f2;
  --paper-raised:#ffffff;
  --ink:        #171a21;
  --ink-soft:   #4b515c;
  --line:       #cfd4da;
  --edge:       #2f5d8a;   /* connection / link color, from network diagrams */
  --edge-soft:  #7d9ab8;
  --signal:     #b8802e;   /* single warm accent, used sparingly */
  --node-fill:  #171a21;

  /* type */
  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", serif;
  --font-body:    "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", "SFMono-Regular", Menlo, monospace;

  /* scale */
  --measure: 62ch;
  --gap: 1.5rem;
  --radius: 3px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1,h2,h3{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  color: var(--ink);
  margin: 0 0 0.5em 0;
}

h1{ font-size: clamp(2.2rem, 4.5vw, 3.4rem); font-weight: 500; }
h2{ font-size: clamp(1.5rem, 2.6vw, 2rem); }
h3{ font-size: 1.15rem; }

p{ margin: 0 0 1em 0; max-width: var(--measure); color: var(--ink-soft); }

a{ color: var(--edge); text-decoration: none; }
a:hover{ text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible{
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--edge);
}

.wrap{
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ---------------------------------------------------------
   Header / nav
   --------------------------------------------------------- */
.site-header{
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}

.site-header .wrap{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}

.brand{
  display:flex;
  align-items: baseline;
  gap: 0.6rem;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}
.brand:hover{ text-decoration: none; }
.brand .brand-mark{
  width: 10px; height: 10px;
  background: var(--signal);
  border-radius: 50%;
  display: inline-block;
  flex: none;
}
.brand small{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--ink-soft);
}

nav.primary-nav ul{
  list-style: none;
  display:flex;
  gap: 1.8rem;
  margin:0; padding:0;
}
nav.primary-nav a{
  color: var(--ink);
  font-size: 0.95rem;
}
nav.primary-nav a[aria-current="page"]{
  color: var(--edge);
  border-bottom: 2px solid var(--signal);
  padding-bottom: 3px;
}

.nav-toggle{
  display:none;
  background:none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  font-family: var(--font-mono);
  cursor:pointer;
}

@media (max-width: 720px){
  .nav-toggle{ display:block; }
  nav.primary-nav{
    display:none;
    position:absolute;
    left:0; right:0; top: 100%;
    background: var(--paper-raised);
    border-bottom: 1px solid var(--line);
  }
  nav.primary-nav.open{ display:block; }
  nav.primary-nav ul{
    flex-direction: column;
    gap:0;
    padding: 0.5rem 2rem 1.2rem;
  }
  nav.primary-nav li{ padding: 0.55rem 0; border-bottom: 1px dashed var(--line); }
}

/* ---------------------------------------------------------
   Hero
   --------------------------------------------------------- */
.hero{
  padding: 4.5rem 0 3.5rem;
}
.hero .wrap{
  display:grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}
@media (max-width: 860px){
  .hero .wrap{ grid-template-columns: 1fr; }
}

.hero-copy .eyebrow{ display:block; margin-bottom: 0.9rem; }
.hero-copy p.lede{
  font-size: 1.1rem;
  color: var(--ink);
  max-width: 46ch;
}
.hero-affil{
  margin-top: 1.6rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  border-left: 2px solid var(--line);
  padding-left: 0.9rem;
}
.hero-affil a{ color: var(--ink-soft); }

.hero-diagram{ width: 100%; height: auto; }
.hero-diagram .edge{
  stroke: var(--edge-soft);
  stroke-width: 1;
  opacity: 0;
  animation: draw-edge 900ms ease-out forwards;
}
.hero-diagram .node{
  fill: var(--node-fill);
  opacity: 0;
  animation: pop-node 500ms ease-out forwards;
}
.hero-diagram .node.accent{ fill: var(--signal); }
.hero-diagram text{
  font-family: var(--font-mono);
  font-size: 10px;
  fill: var(--ink-soft);
}

@keyframes draw-edge{ to{ opacity: 1; } }
@keyframes pop-node{ to{ opacity: 1; } }

@media (prefers-reduced-motion: reduce){
  .hero-diagram .edge, .hero-diagram .node{
    animation: none !important;
    opacity: 1 !important;
  }
}

/* ---------------------------------------------------------
   Sections
   --------------------------------------------------------- */
section{ padding: 3.2rem 0; }
section.alt{
  background: var(--paper-raised);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section-head{
  display:flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.9rem;
}
.section-head .eyebrow{ margin:0; }

/* research area grid — nodes, not cards */
.area-grid{
  display:grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2px;
  background: var(--line);
  border: 1px solid var(--line);
}
@media (max-width: 900px){ .area-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 720px){ .area-grid{ grid-template-columns: 1fr; } }

.area{
  background: var(--paper);
  padding: 1.8rem;
  position: relative;
}
.area .index{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--edge);
  display:block;
  margin-bottom: 0.6rem;
}
.area h3{ margin-bottom: 0.5rem; }
.area p{ font-size: 0.95rem; margin-bottom: 0; }

/* news / list rows */
.row-list{ border-top: 1px solid var(--line); }
.row-item{
  display:grid;
  grid-template-columns: 9rem 1fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}
@media (max-width: 620px){
  .row-item{ grid-template-columns: 1fr; gap: 0.3rem; }
}
.row-item time{
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.row-item p{ margin:0; }

/* people grid */
.people-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
@media (max-width: 860px){ .people-grid{ grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px){ .people-grid{ grid-template-columns: 1fr; } }

.person{ border-top: 2px solid var(--ink); padding-top: 0.9rem; }
.person .avatar{
  width: 100%;
  aspect-ratio: 1;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  margin-bottom: 0.9rem;
  display:flex;
  align-items:center;
  justify-content:center;
  font-family: var(--font-mono);
  color: var(--line);
  font-size: 0.75rem;
  overflow: hidden;
}
.person .avatar img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.person .avatar.initials{
  color: var(--edge);
  font-size: 1.4rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  background: var(--paper);
}
.person h3{ margin-bottom: 0.15rem; }
.person .role{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--edge);
  display:block;
  margin-bottom: 0.6rem;
}
.person p{ font-size: 0.92rem; }
.person .links a{ font-size: 0.85rem; margin-right: 0.8rem; }

/* publications */
.pub-year{
  font-family: var(--font-mono);
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin: 2rem 0 0.6rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--line);
}
.pub-list{ list-style:none; margin:0; padding:0; }
.pub-item{
  padding: 1rem 0;
  border-bottom: 1px dashed var(--line);
}
.pub-item .pub-title{ color: var(--ink); font-weight: 500; }
.pub-item .pub-meta{
  display:block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-top: 0.3rem;
}
.pub-item .pub-tag{
  display:inline-block;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.1rem 0.4rem;
  color: var(--ink-soft);
  margin-right: 0.4rem;
}

.placeholder-note{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--signal);
  background: #f7ecdb;
  border: 1px dashed var(--signal);
  padding: 0.7rem 1rem;
  margin-bottom: 2rem;
  max-width: none;
}

/* ---------------------------------------------------------
   Footer
   --------------------------------------------------------- */
.site-footer{
  border-top: 1px solid var(--line);
  padding: 2.5rem 0;
  margin-top: 2rem;
}
.site-footer .wrap{
  display:flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.site-footer a{ color: var(--ink-soft); }
.site-footer .cols{
  display:flex;
  gap: 3rem;
  flex-wrap: wrap;
}
.site-footer .cols div{ font-family: var(--font-mono); font-size: 0.8rem; }
.site-footer .cols a{ display:block; margin-bottom: 0.4rem; }

.btn{
  display:inline-block;
  border: 1px solid var(--ink);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  padding: 0.55rem 1rem;
  border-radius: var(--radius);
  margin-top: 1.4rem;
}
.btn:hover{ background: var(--ink); color: var(--paper); text-decoration:none; }

/* |Quantum⟩ Lab — additions to the shared institute layout */
.skip-link{ position:fixed; left:1rem; top:-5rem; z-index:100; background:var(--paper-raised); padding:.6rem 1rem; }
.skip-link:focus{ top:1rem; }
.site-header .wrap{ gap:1.4rem; }
.brand{ white-space:nowrap; }
nav.primary-nav ul{ gap:1.25rem; }
.page-intro{ padding-bottom:1.5rem; }
.page-intro .wrap{ display:block; }
.page-intro .eyebrow{ display:block; margin-bottom:.9rem; }
.page-intro .lede{ max-width:65ch; }
.area h3 a{ color:var(--ink); }
.feature-grid{ display:grid; grid-template-columns:1fr 1fr; gap:3rem; }
.feature-grid .eyebrow{ display:block; margin-bottom:.8rem; }
.text-link{ font-family:var(--font-mono); font-size:.85rem; }
.group-heading{ margin-top:3rem; }
.research-row{ grid-template-columns:18rem 1fr; gap:2.5rem; padding:2rem 0; scroll-margin-top:7rem; }
.research-row h2{ font-size:1.4rem; }
.research-row .index{ display:block; font-family:var(--font-mono); font-size:.78rem; color:var(--edge); margin-bottom:.6rem; }
.research-row p{ margin:0; }
.project-row{ padding:1.6rem 0; }
.project-row p{ margin-bottom:.5rem; }
.project-period,.item-meta{ font-family:var(--font-mono); font-size:.8rem; color:var(--ink-soft); }
.project-row h3{ font-size:1.35rem; }
.source-note{ margin:2.2rem 0 0; font-size:.88rem; max-width:80ch; }
.software-grid{ display:grid; grid-template-columns:1fr 1fr; gap:2rem 3rem; }
.software-item{ border-top:2px solid var(--ink); padding-top:1.2rem; display:flex; flex-direction:column; align-items:flex-start; }
.software-item .eyebrow{ margin-bottom:.75rem; }
.software-item h2{ font-size:1.5rem; overflow-wrap:anywhere; }
.software-item p{ font-size:.95rem; }
.software-links{ display:flex; flex-wrap:wrap; gap:.5rem 1.5rem; margin-top:auto; padding-top:.5rem; font-size:.82rem; font-family:var(--font-mono); }
.pub-year{ font-family:var(--font-mono); font-weight:500; font-size:1rem; }
.pub-year:first-child{ margin-top:0; }
.pub-links{ font-size:.85rem; margin-top:.5rem; }
.footer-brand{ font-family:var(--font-display); font-size:1.1rem; color:var(--ink); font-weight:500; }
.site-footer .cols strong{ display:block; margin-bottom:.6rem; color:var(--ink); font-weight:500; }
.person .avatar img{ object-position:center 25%; }
.person .links{ display:flex; flex-wrap:wrap; gap:.5rem; }
.person .links a{ margin:0; }

/* The map depicts research relationships, not a physical network topology. */
.research-map{ margin:0; min-width:0; }
.quantum-diagram{ overflow:visible; display:block; }
.quantum-diagram text{ font-size:12px; }
.map-orbit{ fill:none; stroke:var(--line); stroke-width:1; stroke-dasharray:2 7; }
.quantum-diagram .edge{ stroke-width:1.3; transition:stroke .2s,stroke-width .2s; }
.quantum-diagram .edge.is-active{ stroke:var(--edge); stroke-width:2.8; }
.map-topic{ cursor:pointer; }
.map-topic text{ transition:fill .2s; }
.map-topic:hover text,.map-topic:focus-visible text{ fill:var(--edge); }
.map-topic:focus-visible{ outline:none; }
.node-hit{ fill:transparent; stroke:transparent; stroke-width:1.5; }
.map-topic:hover .node-hit,.map-topic:focus-visible .node-hit{ fill:#b8802e15; stroke:var(--signal); }
.hub-disc{ fill:var(--paper-raised); stroke:var(--edge); stroke-width:1.5; }
.hub-halo{ fill:none; stroke:var(--edge-soft); opacity:.25; }
.map-hub:hover .hub-disc,.map-hub:focus-visible .hub-disc{ stroke:var(--signal); stroke-width:3; }
.quantum-diagram .hub-label{ fill:var(--edge); font-size:15px; font-weight:500; }
.signal-path{ fill:none; stroke:var(--signal); stroke-width:2.5; stroke-linecap:round; stroke-dasharray:4 110; animation:quantum-flow 9s linear infinite; pointer-events:none; }
.signal-secondary{ animation-duration:12s; animation-delay:-4s; }
@keyframes quantum-flow{ to{ stroke-dashoffset:-456; } }
.research-map.is-paused .signal-path{ animation-play-state:paused; }
.research-map figcaption{ border-top:1px solid var(--line); padding-top:.8rem; margin-top:.8rem; display:flex; justify-content:space-between; align-items:center; gap:1rem; font-family:var(--font-mono); font-size:.66rem; color:var(--ink-soft); }
.motion-toggle{ background:transparent; color:var(--ink-soft); font-family:var(--font-mono); font-size:.66rem; padding:.45rem .6rem; border:1px solid var(--line); border-radius:var(--radius); cursor:pointer; flex-shrink:0; min-height:36px; }
.motion-toggle:hover{ border-color:var(--edge); color:var(--edge); }
[hidden]{ display:none !important; }

@media (max-width:1050px){ .brand small{ display:none; } }
@media (min-width:721px) and (max-width:900px){
  .nav-toggle{ display:block; }
  nav.primary-nav{ display:none; position:absolute; left:0; right:0; top:100%; background:var(--paper-raised); border-bottom:1px solid var(--line); }
  nav.primary-nav.open{ display:block; }
  nav.primary-nav ul{ flex-direction:column; gap:0; padding:.5rem 2rem 1.2rem; }
  nav.primary-nav li{ padding:.55rem 0; border-bottom:1px dashed var(--line); }
}
@media (max-width:900px){ nav.primary-nav ul{ gap:0; } }
@media (max-width:860px){
  .research-map{ width:100%; max-width:520px; margin:0 auto; }
  .hero .wrap{ gap:2.5rem; }
}
@media (max-width:620px){
  .wrap{ padding-left:1.25rem; padding-right:1.25rem; }
  .hero{ padding-top:2.7rem; }
  .research-row{ grid-template-columns:1fr; gap:.7rem; }
  .feature-grid,.software-grid{ grid-template-columns:1fr; gap:2rem; }
  .section-head{ flex-wrap:wrap; }
  .site-footer .cols{ gap:2rem; }
  .research-map figcaption{ gap:.5rem; }
  .research-row{ scroll-margin-top:6rem; }
}
@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  .signal-path{ animation:none !important; stroke-dasharray:4 12; }
  .quantum-diagram *{ transition:none !important; }
}
@media print{
  .site-header{ position:static; }
  .nav-toggle,.motion-toggle{ display:none; }
  .signal-path{ animation:none; }
  .person,.software-item,.pub-item{ break-inside:avoid; }
}