@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,500;8..60,600;8..60,700&family=IBM+Plex+Sans:wght@300;400;500;600&display=swap');

:root {
  --bg: #f5f5f2;
  --panel: #ffffff;
  --ink: #1b2b3c;
  --muted: #5d6a77;
  --line: #d8dee5;
  --accent: #8d2b2b;
  --accent-soft: #b0524a;
  --shadow: 0 12px 34px rgba(23, 35, 52, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

html {
  scrollbar-gutter: stable both-edges;
}

body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}

.container {
  max-width: 1280px;
}

.container > .row {
  justify-content: center;
}

#border-left,
#border-right {
  display: none;
}

.container > .row > .col-sm-12.col-lg-8 {
  flex: 0 0 100%;
  max-width: 980px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.col-sm-12.col-lg-8 > .top-shell,
.col-sm-12.col-lg-8 > #main-text {
  width: 100%;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
}

#top-shell,
.top-shell {
  margin-top: 2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: none;
  overflow: visible;
}

#header-top {
  display: block;
  margin-top: 0;
  padding: 1.85rem 1rem 1.45rem;
  text-align: center;
  background: transparent !important;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.display-4 {
  margin: 0;
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(2rem, 4.5vw, 3rem);
  letter-spacing: 0.01em;
}

#title-affiliation {
  margin-top: 0.45rem;
  margin-bottom: 0;
  padding-bottom: 0.55rem;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: clamp(0.92rem, 2vw, 1.05rem);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

#header-top .container {
  padding-bottom: 0.35rem;
}

.title-separator {
  display: none;
}

.no_highlight_link,
.no_highlight_link:hover {
  color: var(--ink);
  text-decoration: none;
}

#Mobile-header {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: 1.4rem;
  margin: 0;
  display: block;
}

.navbar {
  margin-top: 0;
  border: 0;
  border-top: 1px solid var(--line);
  border-radius: 0;
  background: transparent !important;
  box-shadow: none;
  padding: 0.42rem 1rem;
  transition: background-color 280ms ease, border-color 280ms ease, color 200ms ease;
}

.top-shell .navbar.scrolled {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(920px, calc(100vw - 2rem));
  z-index: 1200;
  border: 1px solid #7a2121;
  border-radius: 0 0 12px 12px;
  background: var(--accent) !important;
  transition: background-color 280ms ease, border-color 280ms ease, color 200ms ease;
}

.top-shell .navbar.scrolled .nav-link {
  color: #fff6f6 !important;
}

.top-shell .navbar.scrolled .nav-item:hover .nav-link::after {
  background: #ffd3d3;
}

.top-shell .navbar.scrolled .navbar-nav > .active > .nav-link,
.top-shell .navbar.scrolled .navbar-nav > .active > .nav-link:hover {
  color: #ffffff !important;
}

.top-shell .navbar.scrolled .navbar-nav > .active > .nav-link::after {
  background: #ffffff;
}

.top-shell .navbar.scrolled .navbar-toggler span {
  background: #fff6f6;
}

.top-shell .navbar.scrolled #Mobile-header,
.top-shell .navbar.scrolled #Mobile-header .no_highlight_link,
.top-shell .navbar.scrolled #Mobile-header .no_highlight_link:hover {
  color: #fff6f6 !important;
}

.top-shell .navbar.scrolled #Mobile-header font {
  color: #ffffff !important;
}

.navbar-nav {
  width: 100%;
  justify-content: center;
  gap: 0.35rem;
}

.nav-item {
  position: relative;
  font-size: 1.16rem;
}

.nav-link {
  color: var(--ink) !important;
  padding: 0.5rem 0.7rem !important;
  font-weight: 500;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.2rem;
  height: 2px;
  background: transparent;
  transform: scaleX(0.45);
  transform-origin: center;
  transition: background-color 140ms ease, transform 140ms ease;
}

.nav-item:hover .nav-link::after {
  background: var(--accent-soft);
  transform: scaleX(1);
}

.navbar-nav > .active > .nav-link,
.navbar-nav > .active > .nav-link:hover {
  color: var(--accent) !important;
  font-weight: 600;
}

.navbar-nav > .active > .nav-link::after {
  background: var(--accent);
  transform: scaleX(1);
}

.navbar-toggler {
  border: none;
  background: transparent;
}

.navbar-toggler:focus {
  outline: none;
}

.navbar-toggler span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

#main-text {
  margin-top: 1rem;
  padding-top: 0;
  padding-left: 0;
  padding-right: 0;
  background: transparent;
  flex: 1 0 auto;
  font-size: 1.06rem;
}

#main-text > .container,
#home-holder,
#contact-container,
#data-container,
#Current_Courses,
#Past_Courses,
#WorkingPapers,
#WorkInProgress,
#OldStuff,
#Resting,
#HistoricalBritishPatents,
#EllisIsland,
#CensusLink {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.45rem 1.35rem;
  box-shadow: none;
  transition: background-color 180ms ease;
}

#HistoricalBritishPatents,
#EllisIsland,
#CensusLink {
  margin-bottom: 1rem;
}

#main-text > #CensusLink {
  margin-bottom: 0;
}

/* Data page: each project in its own full-width container */
#main-text > .data-section {
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: none;
  padding: 1.45rem 1.35rem;
  transition: background-color 180ms ease;
}

#main-text > .data-section + .data-section {
  margin-top: 1.4rem;
}

#main-text > .data-section .separator {
  display: none;
}

#main-text > .data-section .row {
  align-items: flex-start;
}

#main-text > .data-section:hover {
  background-color: #fff3f3;
}

.research-item,
.teaching-item {
  border-radius: 8px;
  padding: 0.5rem 0.7rem;
  transition: background-color 180ms ease;
}

.research-item:hover,
.teaching-item:hover {
  background-color: #fff3f3;
}

.display-5 {
  font-family: 'Source Serif 4', Georgia, serif;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  margin-bottom: 0.8rem;
  color: #13263b;
}

#WorkingPapers > .display-5,
#WorkInProgress > .display-5,
#Resting > .display-5,
#OldStuff > .display-5,
#Current_Courses > .display-5,
#Past_Courses > .display-5 {
  margin-bottom: 1.2rem;
}

.h5,
.h6,
h5,
h6 {
  color: #13263b;
}

#contacts-container .h5 {
  margin-bottom: 1rem;
}

#contacts-container a + .h6 {
  margin-top: 0.9rem;
}

#contacts-container {
  align-items: center;
}

p {
  margin-bottom: 0.75rem;
}

.index-holder,
.data-item,
.text-justify,
.teaching-par {
  color: #25384b;
}

.separator {
  margin: 1.15rem 0;
  border-top: 1px solid var(--line);
}

.text-muted {
  color: var(--muted) !important;
  font-size: 1em;
}

.link_text,
.link_paper {
  color: var(--accent);
  font-size: 1.06em;
  text-decoration: none;
  border-bottom: 0;
  transition: color 120ms ease, text-decoration-color 120ms ease;
}

.link_muted {
  color: var(--muted);
  font-size: 1.06em;
  text-decoration: none;
  border-bottom: 0;
  transition: color 120ms ease, text-decoration-color 120ms ease;
}

.link_text:hover,
.link_paper:hover,
.link_muted:hover {
  color: #6e171a;
  border-bottom: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.item-research-teaching {
  text-decoration-color: var(--accent);
}


.responsive-picture {
  width: min(230px, 65%);
  height: auto;
  margin: 0.5rem 0 1rem;
  border-radius: 6px;
  border: 0;
  box-shadow: none;
}

.buttonAbstract {
  display: inline-block;
  margin-top: 0.18rem;
  margin-bottom: 0.35rem;
  padding: 0.34rem 0.82rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  font-size: 0.98rem;
}

.buttonAbstract:focus,
.buttonAbstract:active,
.buttonAbstract:not(:disabled):not(.disabled):active,
.show > .buttonAbstract.dropdown-toggle {
  background: #fff;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: none;
  outline: none;
}

.buttonAbstract:hover,
.buttonAbstract:hover:focus {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.buttonAbstract .link_button {
  color: inherit;
  text-decoration: none;
}

.card {
  margin-top: 0.4rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}

.card-body {
  padding-top: 0.65rem;
  padding-bottom: 0.3rem;
}

.map-holder,
#gmap_canvas {
  width: 100%;
  min-height: 320px;
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: none;
}

#WorkInProgress,
#OldStuff,
#Resting {
  width: 100%;
  max-width: 920px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 1rem;
}

#Past_Courses {
  margin-top: 1rem;
}

#my-footer {
  margin: 0 0 2rem;
  margin-top: auto;
  padding-top: 1rem;
  text-align: center;
  color: var(--muted);
}

#home-holder .row {
  align-items: center;
}

@media (max-width: 767px) {
  #header-top {
    display: none;
  }

  .top-shell {
    margin-top: 0.55rem;
  }

  .navbar {
    margin-top: 0;
    border-top: 0;
  }

  .top-shell .navbar.scrolled {
    left: 15px;
    right: 15px;
    width: auto;
    transform: none;
    border-radius: 10px;
  }

  .container > .row > .col-sm-12.col-lg-8 {
    max-width: 100%;
  }

  #main-text > .container,
  #home-holder,
  #contact-container,
  #data-container,
  #Current_Courses,
  #Past_Courses,
  #WorkingPapers,
  #WorkInProgress,
  #OldStuff,
  #HistoricalBritishPatents,
  #EllisIsland,
  #CensusLink {
    padding: 1.05rem 0.9rem;
  }

  .navbar-nav {
    gap: 0;
  }
}

@media (min-width: 768px) {
  #Mobile-header {
    display: none;
  }
}