/* ==========================================================================
   Cultural Dynamics Lab, stylesheet
   ========================================================================== */

:root {
  --crimson: #A31F34;
  --crimson-dark: #7A1626;
  --ink: #1B1B1B;
  --ink-soft: #5A5A5A;
  --paper: #FFFFFF;
  --paper-alt: #F5F5F5;
  --line: #DADADA;
  --gold: #C9A24B;
  --max-width: 1120px;
  --serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter", "Helvetica Neue", Arial, sans-serif;

  /* The dark theme names its colours --bg/--fg/--hairline and so on. Giving
     those same names light values here means one set of structural rules can
     serve both themes: css/type.css states the shape, and whichever palette
     is loaded fills in the colour. Without this, borders and rules written
     against --hairline would resolve to nothing on the light theme. */
  --bg: #FFFFFF;
  --bg-raised: #F5F5F5;
  --bg-sunken: #1B1B1B;
  --bg-header: #A31F34;
  --fg: #1B1B1B;
  --fg-muted: #5A5A5A;
  --fg-dim: #B0B0B0;
  --on-fg: #FFFFFF;
  --on-sunken: #C4C4C4;
  --accent: #A31F34;
  --on-accent: #FFFFFF;
  --label: #A31F34;
  --hairline: #DADADA;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--crimson-dark);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  color: var(--ink);
  line-height: 1.25;
  font-weight: 600;
}

h1 { font-size: 2.6rem; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.1rem; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--crimson-dark);
  font-weight: 600;
}

/* ---------------------------------------------------------------------- */
/* Top bar                                                                 */
/* ---------------------------------------------------------------------- */

.top-bar {
  background: var(--ink);
  color: #C4C4C4;
  font-size: 0.8rem;
}

.top-bar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.4rem;
  padding-bottom: 0.4rem;
  flex-wrap: wrap;
  gap: 0.3rem;
}

/* Both halves cannot fit on a phone: the department line alone fills a 390px
   screen, so the second one wrapped underneath and left the bar two lines
   tall. "Join the lab" is in the navigation on every page, so drop it here. */
@media (max-width: 560px) {
  .top-bar .container > span:last-child { display: none; }
  .top-bar .container { justify-content: center; }
}

.top-bar a {
  color: #C4C4C4;
}

/* ---------------------------------------------------------------------- */
/* Site header / flexible nav                                             */
/* ---------------------------------------------------------------------- */

.site-header {
  background: var(--paper);
  border-bottom: 3px solid var(--crimson);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
}

.brand-mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--crimson) 0%, var(--crimson-dark) 100%);
  color: #fff;
  font-family: var(--serif);
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
}

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand-text .name {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
  white-space: nowrap;
}

.brand-text .tagline {
  font-size: 0.72rem;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
}

/* Three bars and nothing else. The button sat in a filled, outlined box,
   which read as a white tile stuck on the crimson header. Padding stays so
   the tap target clears Apple's 44px, even though the bars are smaller. */
.nav-toggle {
  display: none;
  border: 0;
  background: none;
  border-radius: 0;
  padding: 0;
  width: 44px;
  height: 44px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  margin: 5px auto;
}

/* the flexible tab-style nav: wraps freely, no fixed widths, grows/shrinks
   with viewport and with the number of links */
.site-nav {
  display: flex;
}

.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
  background: var(--paper-alt);
  color: var(--ink);
  text-decoration: none;
}

.site-nav a.active {
  background: var(--crimson);
  color: #fff;
}

/* ---------------------------------------------------------------------- */
/* Hero                                                                    */
/* ---------------------------------------------------------------------- */

.hero {
  background: linear-gradient(160deg, var(--paper-alt) 0%, var(--paper) 60%);
  border-bottom: 1px solid var(--line);
}

.hero .container {
  padding-top: 4.5rem;
  padding-bottom: 4rem;
}

.hero-main {
  max-width: 640px;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero p.lead {
  font-size: 1.15rem;
  color: var(--ink-soft);
}

.hero-banner {
  height: 280px;
  background: linear-gradient(120deg, #2c2620 0%, var(--crimson-dark) 55%, var(--crimson) 100%);
  position: relative;
  overflow: hidden;
}

.hero-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 15% 30%, rgba(255,255,255,0.08) 0, transparent 45%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,0.10) 0, transparent 40%);
}

.page-header {
  padding: 3rem 0 2.25rem;
  border-bottom: 1px solid var(--line);
  background: var(--paper-alt);
}

.page-header h1 {
  margin: 0 0 0.5rem;
}

.page-header p {
  color: var(--ink-soft);
  max-width: 700px;
  margin: 0;
}

/* ---------------------------------------------------------------------- */
/* Sections                                                                */
/* ---------------------------------------------------------------------- */

section {
  padding: 3rem 0;
}

section + section {
  border-top: 1px solid var(--line);
}

.section-heading {
  margin-bottom: 1.75rem;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
  gap: 2.5rem;
}

@media (max-width: 800px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

/* ---------------------------------------------------------------------- */
/* Cards                                                                   */
/* ---------------------------------------------------------------------- */

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem;
}

/* Home page layout: main content next to a news sidebar */
.home-layout {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 800px) {
  .home-layout {
    grid-template-columns: 1fr;
  }
}

.home-sidebar .section-heading h2 {
  font-size: 1.5rem;
}

.news-sidebar {
  max-height: 460px;
  overflow-y: auto;
  position: sticky;
  top: 90px;
}

.news-list {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.news-item {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 1.25rem;
  padding-bottom: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.news-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.news-date {
  font-family: var(--serif);
  color: var(--crimson-dark);
  font-weight: 600;
  font-size: 0.95rem;
}

@media (max-width: 560px) {
  .news-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}

/* the sidebar is narrow, so always stack date above text there */
.home-sidebar .news-item {
  grid-template-columns: 1fr;
  gap: 0.2rem;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 800px) {
  .pillars { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .pillars { grid-template-columns: 1fr; }
}

.pillar {
  border-top: 3px solid var(--crimson);
  padding-top: 0.9rem;
}

.pillar h3 {
  margin: 0 0 0.4rem;
}

.pillar p {
  color: var(--ink-soft);
  font-size: 0.95rem;
  margin: 0;
}

/* ---------------------------------------------------------------------- */
/* People                                                                  */
/* ---------------------------------------------------------------------- */

.pi-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  align-items: start;
}

@media (max-width: 640px) {
  .pi-card {
    grid-template-columns: 1fr;
  }
}

.avatar {
  width: 100%;
  aspect-ratio: 4 / 5;
  border-radius: 10px;
  background: linear-gradient(150deg, var(--paper-alt), var(--line));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--crimson-dark);
  font-family: var(--serif);
  font-size: 2.4rem;
  font-weight: 700;
  border: 1px solid var(--line);
}

.avatar.small {
  aspect-ratio: 1 / 1;
  font-size: 1.5rem;
  border-radius: 8px;
}

.pi-links {
  margin: 0.75rem 0 1rem;
  font-size: 0.92rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  color: var(--ink-soft);
}

.hometown-section .section-heading {
  margin-bottom: 1.25rem;
}

.map-intro {
  max-width: 760px;
  color: var(--ink-soft);
  margin: 0.35rem 0 0;
}

.hometown-explorer {
  padding: 1rem;
}

.hometown-map-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(250px, 0.8fr);
  gap: 1.25rem;
  align-items: stretch;
}

.map-canvas {
  position: relative;
  min-height: 340px;
  aspect-ratio: 2 / 1;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(145deg, #faf9f5 0%, var(--paper-alt) 100%);
}

.world-silhouette {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.map-graticule {
  fill: none;
  stroke: rgba(122, 22, 38, 0.09);
  stroke-width: 1;
}

.map-land {
  fill: #E4E4E4;
  stroke: #C9C9C9;
  stroke-width: 2;
  stroke-linejoin: round;
}

.map-marker {
  --marker-color: var(--crimson);
  position: absolute;
  left: var(--x);
  top: var(--y);
  z-index: 2;
  width: 44px;
  height: 44px;
  margin: -22px 0 0 -22px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.map-dot {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--marker-color);
  box-shadow: 0 1px 0 rgba(27, 27, 27, 0.18);
  font-family: var(--sans);
  font-size: 0.54rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.map-marker.marker-director {
  --marker-color: var(--gold);
}

.map-marker.marker-affiliate {
  --marker-color: #5d625e;
}

.map-marker:hover .map-dot,
.map-marker.active .map-dot {
  transform: scale(1.18);
  box-shadow: 0 0 0 3px rgba(201, 162, 75, 0.35), 0 2px 4px rgba(27, 27, 27, 0.22);
}

.map-marker:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 2px;
}

.map-sidebar {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.25rem;
  border-left: 3px solid var(--crimson);
  border-radius: 0 8px 8px 0;
  background: var(--paper-alt);
}

.map-member-detail h3 {
  margin: 0.15rem 0;
}

.map-detail-label {
  margin: 0;
  font-size: 0.68rem;
}

.map-member-role {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.map-member-location {
  margin: 1rem 0 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.map-member-location strong {
  color: var(--ink);
  font-size: 0.98rem;
}

.map-roster-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.map-member-picker {
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.map-member-picker label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.map-member-picker select {
  width: 100%;
  min-height: 2.5rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid #C0C0C0;
  border-radius: 5px;
  background: #fff;
  color: var(--ink);
  font-family: var(--sans);
}

.map-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.85rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.map-legend li {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border: 1px solid var(--paper);
  border-radius: 50%;
  background: var(--crimson);
  box-shadow: 0 0 0 1px rgba(27, 27, 27, 0.15);
}

.legend-director { background: var(--gold); }
.legend-affiliate { background: #5d625e; }

.map-placeholder-note {
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.76rem;
  line-height: 1.5;
}

.map-location-list {
  margin-top: 1rem;
  border-top: 1px solid var(--line);
  padding-top: 0.85rem;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

.map-location-list summary {
  cursor: pointer;
  color: var(--crimson-dark);
  font-weight: 600;
}

.map-location-list ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem 1.25rem;
  margin: 0.75rem 0 0;
  padding: 0;
  list-style: none;
}

.map-location-list strong {
  color: var(--ink);
}

.pi-card[id],
.roster-card[id] {
  scroll-margin-top: 7rem;
}

.pi-card[id]:target,
.roster-card[id]:target {
  border-color: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 75, 0.26);
}

@media (max-width: 800px) {
  .hometown-map-layout {
    grid-template-columns: 1fr;
  }

  .map-sidebar {
    border-top: 3px solid var(--crimson);
    border-left: 0;
    border-radius: 0 0 8px 8px;
  }
}

@media (max-width: 560px) {
  .hometown-explorer {
    padding: 0.7rem;
  }

  .map-canvas {
    min-height: 220px;
  }

  .map-sidebar {
    padding: 1rem;
  }

  .map-location-list ul {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .map-dot {
    transition: none;
  }
}

.roster-group {
  margin-bottom: 2.25rem;
}

.roster-group h3 {
  border-bottom: 2px solid var(--crimson);
  display: inline-block;
  padding-bottom: 0.25rem;
  margin-bottom: 1rem;
}

.roster-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.roster-card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.9rem;
  background: #fff;
}

.rcard-head {
  display: flex;
  gap: 0.85rem;
  align-items: center;
}

.roster-card .info {
  min-width: 0;
}

.roster-card .info .rname {
  font-weight: 600;
  font-size: 0.95rem;
}

.roster-card .info .rrole {
  font-size: 0.8rem;
  color: var(--ink-soft);
}

.roster-card .rbio {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 0;
}

.roster-card .rlinks {
  display: flex;
  gap: 0.75rem;
  margin: 0;
  font-size: 0.78rem;
}

.alumni-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.6rem 1.5rem;
}

.alumni-list li {
  list-style: none;
  padding: 0.4rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.93rem;
}

.alumni-list .aname {
  font-weight: 600;
}

.alumni-list .anow {
  color: var(--ink-soft);
}

/* ---------------------------------------------------------------------- */
/* Research sidebar + tabs (flexible)                                     */
/* ---------------------------------------------------------------------- */

.research-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 800px) {
  .research-layout {
    grid-template-columns: 1fr;
  }
}

/* the flexible theme nav: a vertical sidebar on wide screens that becomes a
   wrapping horizontal row above the content on narrow screens, so the list
   of themes stays usable at any length or width */
.tabs {
  display: flex;
  flex-direction: column;
  flex-wrap: wrap;
  gap: 0.15rem;
  position: sticky;
  top: 110px;
  margin-top: 2rem;
  counter-reset: themenum;
}

@media (max-width: 800px) {
  .tabs {
    flex-direction: row;
    position: static;
    margin-top: 0;
    border-bottom: 1px solid var(--line);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
  }
}

.theme-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}

@media (max-width: 800px) {
  .theme-label {
    display: none;
  }
}

.tab-btn {
  counter-increment: themenum;
  flex: 1 1 auto;
  min-width: 160px;
  text-align: left;
  background: transparent;
  border: none;
  border-left: 3px solid var(--line);
  border-radius: 0;
  padding: 0.6rem 0 0.6rem 1rem;
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-soft);
  cursor: pointer;
  transition: all 0.15s ease;
}

.tab-btn::before {
  content: counter(themenum, decimal-leading-zero);
  display: block;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--line);
  margin-bottom: 0.15rem;
}

.tab-btn:hover {
  border-left-color: var(--crimson);
  color: var(--ink);
  background: var(--paper-alt);
}

.tab-btn.active {
  border-left-color: var(--crimson);
  color: var(--crimson-dark);
  background: var(--paper-alt);
}

.tab-btn.active::before {
  color: var(--crimson);
}

@media (max-width: 800px) {
  .tab-btn {
    border-left: none;
    border-bottom: 3px solid var(--line);
    padding: 0.6rem 0.75rem;
  }

  .tab-btn::before {
    display: inline;
    margin-right: 0.4rem;
    margin-bottom: 0;
  }

  .tab-btn.active {
    border-left: none;
    border-bottom-color: var(--crimson);
  }
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1rem 0 1.5rem;
}

.tag {
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-weight: 600;
  color: #FFFFFF;
  background: var(--crimson);
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
}

.publication-list {
  margin: 0;
}

.publication-list p {
  font-size: 0.93rem;
  color: var(--ink-soft);
  margin: 0 0 1rem;
}

.publication-list p:last-child {
  margin-bottom: 0;
}

.publication-list em {
  font-style: italic;
}

.links-box {
  margin-top: 2.5rem;
}

/* ---------------------------------------------------------------------- */
/* Publication status                                                      */
/* ---------------------------------------------------------------------- */

/* Marks a manuscript that is not published yet, inside an ordinary
   publication list. Reads as an annotation, not as part of the citation. */
.pub-status {
  display: inline-block;
  margin-left: 0.15rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.pub-status em {
  font-style: normal;
  text-transform: none;
  letter-spacing: 0;
}

/* ---------------------------------------------------------------------- */
/* Contact                                                                 */
/* ---------------------------------------------------------------------- */

.contact-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 2.5rem;
}

@media (max-width: 800px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-block {
  padding: 1.25rem 1.5rem;
  background: var(--paper-alt);
  border-radius: 10px;
  border: 1px solid var(--line);
  margin-bottom: 1.25rem;
}

/* A link whose text is ordinary words -- "Harvard faculty profile", a person's
   name in a sentence -- shows nothing without an underline. The email
   addresses in the sidebar are left alone: they announce themselves. */
.profile-links a,
.contact-block p a {
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.contact-block h3 {
  margin-top: 0;
}

.btn {
  display: inline-block;
  background: var(--crimson);
  color: #fff;
  padding: 0.7rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.92rem;
}

.btn:hover {
  background: var(--crimson-dark);
  text-decoration: none;
}

/* ---------------------------------------------------------------------- */
/* Footer                                                                  */
/* ---------------------------------------------------------------------- */

.site-footer {
  background: var(--ink);
  color: #C9C9C9;
  margin-top: 2rem;
}

/* One block of text now that the link row has gone, so nothing to space
   apart. */
.site-footer .container {
  padding: 2.5rem 1.5rem;
  font-size: 0.85rem;
}

.site-footer a {
  color: #EFEFEF;
}

/* ---------------------------------------------------------------------- */
/* Responsive nav collapse                                                */
/* ---------------------------------------------------------------------- */

/* Built by the script, so they must stay out of the way at desk width. */
.nav-backdrop,
.nav-drawer { display: none; }

@media (max-width: 700px) {
  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
  }

  /* The header's own list is for the wide layout only. */
  .site-nav { display: none; }

  /* The menu slides in from the right edge and sits over the page, which stays
     visible beside it. Dark in both palettes: like the top bar, it reads as
     chrome rather than as part of the page beneath it. It hangs off <body>,
     not off the header, which is a containing block for fixed children
     because of its backdrop-filter. */
  .nav-drawer {
    display: block;
    position: fixed;
    /* Longhand rather than the inset shorthand, which Safari only learned in
       14.1; an iPhone older than that would leave the panel unanchored. */
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    width: min(76vw, 330px);
    z-index: 70;
    background: #242424;
    padding: 5rem 1.6rem 2rem;
    overflow-y: auto;
    overscroll-behavior: contain;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 280ms ease, visibility 280ms;
  }

  .nav-drawer.open {
    transform: translateX(0);
    visibility: visible;
  }

  .nav-drawer ul {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  .nav-drawer a {
    display: block;
    padding: 0.7rem 0;
    color: rgba(255, 255, 255, 0.72);
    text-decoration: none;
    font-family: var(--display);
    font-size: 0.92rem;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
  }

  .nav-drawer a.active,
  .nav-drawer a:hover { color: #FFFFFF; }

  /* The research themes, indented under Research. They are the list that used
     to sit in the page on a phone; smaller and dimmer than the five sections
     above them, so the two levels stay apart. */
  .nav-drawer .nav-sub {
    list-style: none;
    margin: 0 0 0.5rem;
    padding: 0 0 0 1.1rem;
  }

  .nav-drawer .nav-sub a {
    padding: 0.5rem 0;
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    line-height: 1.45;
    color: rgba(255, 255, 255, 0.55);
  }

  .nav-drawer .nav-sub a.active,
  .nav-drawer .nav-sub a:hover { color: #FFFFFF; }

  /* Research page: the theme list lives in the drawer at this width. */
  .research-layout > .tabs { display: none; }

  .research-layout { display: block; }

  /* Catches the tap that lands on the page beside an open drawer. */
  .nav-backdrop {
    display: block;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 65;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: opacity 280ms ease, visibility 280ms;
  }

  .nav-backdrop.open { opacity: 1; visibility: visible; }

  /* Two strokes crossed, in the drawer's own top-left corner. */
  .nav-close {
    position: absolute;
    top: 1rem;
    left: 1.1rem;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 0;
    background: none;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
  }

  .nav-close::before,
  .nav-close::after {
    content: "";
    position: absolute;
    left: 10px;
    top: 21px;
    width: 24px;
    height: 2px;
    background: #FFFFFF;
  }

  .nav-close::before { transform: rotate(45deg); }
  .nav-close::after { transform: rotate(-45deg); }

  /* The page must not scroll under an open drawer. */
  body.nav-open { overflow: hidden; }
}

@media (prefers-reduced-motion: reduce) {
  .nav-drawer,
  .nav-backdrop { transition: none; }
}

/* ==========================================================================
   Person pages (people/<name>.html)
   Photo on the left, bio on the right, collapsing to one column on narrow
   screens. Colours come from tokens so dark.css carries over unchanged.
   ========================================================================== */

.person-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 2.5rem;
  align-items: start;
}

.person-photo {
  width: 100%;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
  background: linear-gradient(150deg, var(--paper-alt), var(--line));
}

.person-photo img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Stands in for a headshot we do not have yet, matching the roster avatars. */
.person-photo.is-initials {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--crimson-dark);
  font-family: var(--serif);
  font-size: 4rem;
  font-weight: 700;
}

.person-body h1 { margin: 0.2rem 0 0.35rem; }

.person-role {
  margin: 0 0 1.5rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.person-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  margin: 1.75rem 0 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.95rem;
}

.person-back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

@media (max-width: 760px) {
  .person-layout {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .person-photo {
    max-width: 240px;
  }
}

/* ==========================================================================
   Light theme banner

   When the globe switches the site to the crimson theme, the header becomes a
   solid Harvard crimson band and everything on it inverts to white. White on
   #A31F34 is 7.49:1. The home page carries the same rules in its own block,
   because it does not load this file's dark counterpart.
   ========================================================================== */

.theme-crimson .site-header {
  background: #A31F34;
  border-bottom-color: #A31F34;
}

.theme-crimson .brand-mark { color: #FFFFFF; }
.theme-crimson .brand-text .name { color: #FFFFFF; }
.theme-crimson .brand-text .tagline { color: rgba(255, 255, 255, 0.75); }
.theme-crimson .site-nav a { color: rgba(255, 255, 255, 0.8); }

.theme-crimson .site-nav a:hover,
.theme-crimson .site-nav a.active {
  background: none;
  color: #FFFFFF;
  border-bottom-color: #FFFFFF;
}

.theme-crimson .nav-toggle span { background: #FFFFFF; }

/* The wordmark is nowrap, so the brand block has a fixed width; below this
   it and the menu button stop fitting on one row and the button drops under
   the logo, which doubled the header to 142px on a 375px iPhone. The prefix
   on .brand-mark is there to outrank the copy of that rule inside index.html,
   which is later in the cascade. */
@media (max-width: 420px) {
  .brand { gap: 0.5rem; }
  .site-header .brand-mark { width: 46px; height: 34px; }
  .site-header .brand-globe { width: 42px; height: 42px; }
  .site-header .brand-mark-text { font-size: 1.25rem; }
  .brand-text .name { font-size: 0.92rem; }
  .brand-text .tagline { font-size: 0.56rem; letter-spacing: 0.12em; }
}

@media (max-width: 345px) {
  .brand-text .tagline { display: none; }
  .top-bar { font-size: 0.7rem; }
}