/* CSS Document — Matched to edoliberty.github.io */
@import url('https://fonts.googleapis.com/css2?family=Merriweather+Sans:ital,wght@0,400;0,700;1,400;1,700&family=Rubik:ital,wght@0,300;0,400;0,700;1,300;1,700&display=swap');

::selection {
  background-color: #33CC99;
}

html {
  font-size: 17px;
  scroll-behavior: smooth;
  scrollbar-gutter: stable;
}

:root {
  --topbar-h: 3.1rem;
  --strip-h: 3.4rem;
}

body {
  font-family: 'Rubik', sans-serif;
  font-weight: 300;
  color: #1a1c22;
  line-height: 1.6;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: 'Merriweather Sans', sans-serif;
}

h1,
h1.display-1,
h1.display-2,
h1.display-3,
h1.display-4 {
  font-weight: 700;
}

h2,
h3,
h4,
h5,
h6 {
  font-weight: 400;
}

/* Section headings match the wordmark (Merriweather Sans 700, 1rem)
   for a flat, minimal type scale. */
h2 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: .85rem;
}

h3 {
  font-size: .95rem;
  font-weight: 700;
  margin-top: 1.25rem;
  margin-bottom: .5rem;
}

.course-title {
  font-family: 'Merriweather Sans', sans-serif;
  font-size: 1.35rem;
  font-weight: 700;
  color: #1a1c22;
  margin-bottom: .25rem;
}

.course-subtitle {
  color: #6a7180;
  font-size: .95rem;
  margin-bottom: 1.25rem;
}

/* Horizontal divider at the end of each content section */
main .row.my-5:not(:last-child),
main .row.hero {
  border-bottom: 1px solid #b6bcc9;
  padding-bottom: .75em;
}

main .row.first-section {
  margin-top: 0 !important;
  margin-bottom: 3rem !important;
  border-bottom: 1px solid #b6bcc9;
  padding-bottom: .75em;
}

b,
strong {
  font-weight: 700;
}

a {
  color: #031bb3;
}

img {
  max-width: 100%;
}

ul {
  margin-top: .75em;
  list-style: none;
  padding-left: 0;
}

ol {
  margin-top: .75em;
  padding-left: 1.25rem;
}

li + li {
  margin-top: .5em;
  padding-top: .5em;
  border-top: 1px solid #e6e8ee;
}

/* Compact numbered lists (e.g. topics list) */
ol.compact-list li + li {
  margin-top: .35em;
  padding-top: .35em;
}

/* Nested lists inside lecture entries */
li ul {
  margin-top: .45em;
  margin-bottom: .25em;
  padding-left: 1rem;
  border-left: 2px solid #e6e8ee;
}

li ul li + li {
  margin-top: .35em;
  padding-top: .35em;
  border-top: none;
}

li p {
  margin: 0 0 .25em;
}

/* Metadata key-value grid in Overview */
.meta-list li {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem .75rem;
}

.meta-label {
  font-family: 'Merriweather Sans', sans-serif;
  font-weight: 700;
  font-size: .88rem;
  min-width: 8.5rem;
  color: #1a1c22;
}

/* Schedule table */
.schedule-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  margin-top: .75rem;
}

.schedule-table th {
  font-family: 'Merriweather Sans', sans-serif;
  font-weight: 700;
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: #6a7180;
  border-bottom: 1px solid #b6bcc9;
  padding: .5rem .6rem;
  text-align: left;
}

.schedule-table td {
  padding: .45rem .6rem;
  border-bottom: 1px solid #e6e8ee;
  vertical-align: top;
}

.schedule-table tr.no-class td {
  color: #6a7180;
  font-style: italic;
  background-color: #fafbfc;
}

.schedule-table .due-badge {
  font-weight: 700;
  color: #031bb3;
}

/* ---- Top bar: cross-page navigation only ---- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 1030;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid #e6e8ee;
}
.topbar__inner {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  padding: .85rem 15px;
}
.topbar .brand {
  font-family: 'Merriweather Sans', sans-serif;
  font-weight: 700;
  color: #1a1c22;
  text-decoration: none;
}
.topbar .brand:hover {
  color: #031bb3;
  text-decoration: none;
}
.topbar nav {
  margin-left: auto;
  display: flex;
  gap: 1.25rem;
}
.topbar nav a {
  color: #6a7180;
  font-size: .95rem;
}
.topbar nav a.current {
  color: #1a1c22;
}

/* ---- Left table of contents ---- */
.toc {
  position: sticky;
  top: 3.4rem;
  align-self: start;
  max-height: calc(100vh - 3.4rem);
  overflow-y: auto;
  padding: 2rem 0;
}
.toc__label {
  font-family: 'Merriweather Sans', sans-serif;
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: #99a0ad;
  margin: 0 0 .8rem;
}
.toc__label a {
  color: inherit;
  text-decoration: none;
}
.toc__label a:hover {
  color: #031bb3;
}
.toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.toc__list li + li {
  margin-top: .1rem;
  padding-top: 0;
  border-top: none;
}
.toc__list a {
  display: block;
  padding: .3rem .75rem;
  border-left: 2px solid transparent;
  border-radius: 0 4px 4px 0;
  color: #6a7180;
  font-size: .92rem;
  line-height: 1.35;
}
.toc__list a:hover {
  color: #1a1c22;
  background: #f6f7fa;
  text-decoration: none;
}
.toc__list a.active {
  color: #031bb3;
  background: #eef0fb;
  border-left-color: #031bb3;
}

/* ---- Content column ---- */
main {
  padding: 2rem 0 1.5rem;
}
main > h1:first-child {
  margin-top: 0;
}
[id] {
  scroll-margin-top: 4.5rem;
}

/* ---- Mobile: collapse the rail into a sticky chip strip ---- */
@media (max-width: 767.98px) {
  .topbar__inner {
    flex-wrap: wrap;
    row-gap: .3rem;
  }
  .topbar nav {
    flex-wrap: wrap;
    gap: .3rem .9rem;
  }
  .toc {
    position: sticky;
    top: var(--topbar-h);
    max-height: none;
    overflow: visible;
    margin: 0 -15px;
    padding: .55rem 0;
    background: rgba(255, 255, 255, .95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid #e6e8ee;
    z-index: 1020;
    transition: transform .25s ease;
  }
  .toc.toc--hidden {
    transform: translateY(calc(-100% - var(--topbar-h)));
  }
  .toc__label {
    display: none;
  }
  .toc__list {
    display: flex;
    gap: .4rem;
    overflow-x: auto;
    padding: 0 15px .15rem;
    -webkit-overflow-scrolling: touch;
  }
  .toc__list li + li {
    margin-top: 0;
  }
  .toc__list a {
    white-space: nowrap;
  }
  main {
    padding-top: 1.4rem;
  }
  [id] {
    scroll-margin-top: calc(var(--topbar-h) + var(--strip-h) + .5rem);
  }
}