:root {
  --ink: #242327;
  --muted: #64606a;
  --page: #f2efe8;
  --surface: #fffefa;
  --pavonazzetto: #f8f6f1;
  --pavonazzetto-vein: #6f638e;
  --porphyry: #7d243f;
  --porphyry-dark: #4c1628;
  --granite: #34343a;
  --granite-soft: #5c5c65;
  --giallo-antico: #d3a44e;
  --giallo-pale: #f1d38a;
  --joint: #d8d0c2;
  --shadow: 0 20px 35px rgba(36, 35, 39, 0.16);
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  color: var(--ink);
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='144' height='144' viewBox='0 0 144 144'%3E%3Cpath d='M36.5 0.5H107.5L143.5 36.5V107.5L107.5 143.5H36.5L0.5 107.5V36.5Z' fill='none' stroke='%2334343a' stroke-opacity='0.09' stroke-width='1'/%3E%3C/svg%3E"),
    radial-gradient(circle at 18% 24%, rgba(111, 99, 142, 0.18) 0 1px, transparent 2px),
    radial-gradient(circle at 78% 72%, rgba(125, 36, 63, 0.13) 0 1px, transparent 2px),
    var(--page);
  background-size: 9rem 9rem, 18rem 18rem, 22rem 22rem, auto;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.5;
}

body {
  margin: 0;
  overflow-x: hidden;
}

button,
input {
  font: inherit;
}

.site-header {
  min-height: 72vh;
  display: grid;
  align-items: end;
  position: relative;
  isolation: isolate;
  padding: 8rem 1.25rem 5rem;
  color: var(--surface);
  background: var(--granite);
}

.site-header__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    linear-gradient(90deg, rgba(36, 35, 39, 0.86), rgba(76, 22, 40, 0.42)),
    url("https://commons.wikimedia.org/wiki/Special:FilePath/Oculus%20of%20the%20Pantheon%2C%20Rome.jpg?width=1800")
      center 28% / cover no-repeat;
}

.site-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 9rem;
  z-index: -1;
  background: linear-gradient(rgba(242, 239, 232, 0), var(--page));
}

.site-header__content {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

.kicker {
  margin: 0;
  color: var(--giallo-pale);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 780px;
  margin: 0.35rem 0 0;
  font-size: clamp(3.2rem, 12vw, 7.5rem);
  line-height: 0.9;
  letter-spacing: 0;
}

.lede {
  max-width: 650px;
  margin: 1.4rem 0 0;
  color: rgba(255, 254, 250, 0.88);
  font-size: 1.15rem;
}

main {
  width: min(100% - 2.5rem, var(--max-width));
  margin: -2.2rem auto 0;
  position: relative;
  z-index: 1;
}

.toolbar {
  position: sticky;
  top: 0.5rem;
  z-index: 20;
  display: grid;
  gap: 0.65rem;
  align-items: end;
  padding: 0.7rem;
  margin-bottom: 2.35rem;
  border: 1px solid rgba(52, 52, 58, 0.14);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(111, 99, 142, 0.08), transparent 38%),
    rgba(255, 254, 250, 0.92);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.search {
  display: none;
  gap: 0.25rem;
  max-width: 420px;
}

.search__label {
  color: var(--muted);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
}

.search input {
  width: 100%;
  min-height: 2.25rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(52, 52, 58, 0.22);
  border-radius: 6px;
  background: #fffefa;
  color: var(--ink);
}

.era-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.era-nav__button {
  min-height: 1.9rem;
  padding: 0.34rem 0.56rem;
  border: 1px solid rgba(52, 52, 58, 0.18);
  border-radius: 999px;
  background: rgba(248, 246, 241, 0.86);
  color: var(--granite);
  cursor: pointer;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
}

.era-nav__button:hover {
  border-color: rgba(211, 164, 78, 0.86);
  color: var(--porphyry-dark);
}

.era-nav__button:focus-visible {
  outline: 3px solid var(--giallo-antico);
  outline-offset: 3px;
}

.era-nav__button.is-active {
  border-color: var(--porphyry);
  background: var(--porphyry);
  color: var(--surface);
}

.timeline {
  position: relative;
  padding: 2rem 0 4rem;
}

.timeline__line {
  position: absolute;
  top: 0;
  bottom: 2rem;
  left: 50%;
  width: 5px;
  transform: translateX(-50%);
  border-radius: 999px;
  background: linear-gradient(var(--porphyry), var(--giallo-antico), var(--granite));
}

.timeline-item {
  position: relative;
  min-height: 13rem;
  margin-bottom: 4rem;
  scroll-margin-top: 8.25rem;
}

.timeline-item::after {
  content: "";
  display: table;
  clear: both;
}

.timeline-item__marker {
  position: absolute;
  top: 1.7rem;
  left: 50%;
  width: 2rem;
  height: 2rem;
  transform: translateX(-50%);
  border: 5px solid var(--page);
  border-radius: 50%;
  background: var(--porphyry);
  box-shadow:
    0 0 0 1px rgba(52, 52, 58, 0.18),
    inset 0 0 0 5px rgba(211, 164, 78, 0.22);
  z-index: 2;
}

.timeline-card {
  position: relative;
  float: left;
  width: 45%;
  padding: 1.25rem 1.35rem 1.35rem;
  border: 1px solid rgba(52, 52, 58, 0.12);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateX(-2.25rem);
  transition: opacity 520ms ease, transform 520ms ease;
}

.timeline-card::after {
  content: "";
  position: absolute;
  top: 2rem;
  right: -15px;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 15px;
  border-color: transparent transparent transparent var(--surface);
}

.timeline-item:nth-of-type(even) .timeline-card {
  float: right;
  transform: translateX(2.25rem);
}

.timeline-item:nth-of-type(even) .timeline-card::after {
  right: auto;
  left: -15px;
  border-width: 10px 15px 10px 0;
  border-color: transparent var(--surface) transparent transparent;
}

.timeline-item--text-only {
  min-height: 0;
  margin-bottom: 2.6rem;
}

.timeline-item--text-only .timeline-item__marker {
  top: 0;
}

.timeline-item--text-only .timeline-card,
.timeline-item--text-only:nth-of-type(even) .timeline-card {
  float: none;
  width: min(760px, calc(100% - 6rem));
  margin: 2.4rem auto 0;
  transform: translateY(1.5rem);
}

.timeline-item--text-only .timeline-card::after,
.timeline-item--text-only:nth-of-type(even) .timeline-card::after {
  content: none;
}

.timeline-item.is-visible .timeline-card {
  opacity: 1;
  transform: translateX(0);
}

.timeline-item--text-only.is-visible .timeline-card {
  transform: translateY(0);
}

.timeline-media {
  position: relative;
  float: right;
  width: 38%;
  margin: 0.35rem 0 0;
  opacity: 0;
  transform: translateX(2.25rem);
  transition: opacity 520ms ease, transform 520ms ease;
}

.timeline-item:nth-of-type(even) .timeline-media {
  float: left;
  transform: translateX(-2.25rem);
}

.timeline-item.is-visible .timeline-media {
  opacity: 1;
  transform: translateX(0);
}

.timeline-media__button {
  display: block;
  width: 100%;
  padding: 0;
  border: 1px solid rgba(52, 52, 58, 0.14);
  border-radius: 8px;
  background: var(--pavonazzetto);
  box-shadow: var(--shadow);
  cursor: zoom-in;
  overflow: hidden;
  text-decoration: none;
}

.timeline-media__gallery {
  display: grid;
  gap: 0.65rem;
}

.timeline-media__gallery--multiple {
  grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr));
}

.timeline-media__gallery--multiple .timeline-media__button {
  aspect-ratio: 1 / 1;
  display: grid;
  place-items: center;
}

.timeline-media__gallery--multiple .timeline-media__button img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.timeline-media__button:focus-visible {
  outline: 3px solid var(--giallo-antico);
  outline-offset: 4px;
}

.timeline-media__button:hover {
  border-color: rgba(211, 164, 78, 0.86);
}

.timeline-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.timeline-media figcaption {
  margin-top: 0.55rem;
  color: rgba(36, 35, 39, 0.68);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.72rem;
  line-height: 1.4;
}

.timeline-card__date {
  display: inline-block;
  margin: -1.25rem -1.35rem 1rem auto;
  padding: 0.55rem 0.7rem;
  float: right;
  color: var(--surface);
  background: var(--porphyry);
  border-radius: 0 8px 0 8px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
}

.timeline-card h2 {
  clear: both;
  margin: 0 0 0.65rem;
  font-size: clamp(1.45rem, 3vw, 2rem);
  line-height: 1.1;
  letter-spacing: 0;
}

.timeline-card p {
  margin: 0;
  color: #37343a;
}

.timeline-card__drawer {
  margin-top: 1.1rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(52, 52, 58, 0.13);
}

.timeline-card__drawer summary {
  width: 100%;
  min-height: 1.4rem;
  display: grid;
  place-items: center;
  color: var(--porphyry);
  cursor: pointer;
  list-style: none;
}

.timeline-card__drawer summary::-webkit-details-marker {
  display: none;
}

.timeline-card__drawer summary::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 0.34rem solid transparent;
  border-right: 0.34rem solid transparent;
  border-top: 0.42rem solid currentColor;
  opacity: 0.5;
  transition: transform 160ms ease, opacity 160ms ease;
}

.timeline-card__drawer[open] summary::before {
  transform: rotate(180deg);
}

.timeline-card__drawer summary:focus-visible {
  outline: 3px solid var(--giallo-antico);
  outline-offset: 4px;
}

.timeline-card__drawer summary:hover::before,
.timeline-card__drawer summary:focus-visible::before {
  opacity: 0.7;
}

.timeline-card__facts {
  display: grid;
  gap: 0.75rem;
  margin: 0.85rem 0 0;
}

.timeline-card__facts div {
  display: grid;
  grid-template-columns: 5.8rem 1fr;
  gap: 0.8rem;
}

.timeline-card__facts dt {
  color: var(--porphyry);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
}

.timeline-card__facts dd {
  margin: 0;
  color: var(--muted);
}

.timeline-card__citations {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(52, 52, 58, 0.13);
}

.timeline-card__citations cite {
  display: inline-block;
  padding: 0.25rem 0.45rem;
  border-radius: 5px;
  background: rgba(211, 164, 78, 0.2);
  color: var(--porphyry-dark);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.72rem;
  font-style: normal;
  font-weight: 700;
}

.timeline-item[hidden] {
  display: none;
}

.empty-state {
  margin: 0 0 4rem;
  padding: 1.25rem;
  border: 1px solid rgba(52, 52, 58, 0.14);
  border-radius: 8px;
  background: var(--surface);
  text-align: center;
}

.site-footer {
  width: min(100% - 2.5rem, var(--max-width));
  margin: 0 auto;
  padding: 2rem 0 3rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.source-list {
  margin: 0 0 3rem;
  padding: 1.25rem;
  border: 1px solid rgba(52, 52, 58, 0.14);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(111, 99, 142, 0.07), rgba(211, 164, 78, 0.1)),
    rgba(255, 254, 250, 0.74);
}

.source-list h2 {
  margin: 0 0 0.75rem;
  font-size: 1.35rem;
}

.source-list ul {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding-left: 1.1rem;
}

.source-list li {
  color: var(--muted);
}

.source-list code {
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.85rem;
}

.pswp__custom-caption {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  width: calc(100% - 2rem);
  max-width: 46rem;
  transform: translateX(-50%);
  padding: 0.65rem 0.8rem;
  border-radius: 6px;
  background: rgba(248, 246, 241, 0.94);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  font-size: 0.78rem;
  line-height: 1.4;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  .timeline-card,
  .timeline-media {
    transition: none;
  }
}

@media (max-width: 820px) {
  .site-header {
    min-height: 68vh;
    padding-top: 6rem;
  }

  main {
    width: min(100% - 1.25rem, var(--max-width));
  }

  .timeline {
    padding-left: 0.5rem;
  }

  .timeline__line {
    left: 1.55rem;
  }

  .timeline-item {
    min-height: 0;
    margin-bottom: 2rem;
  }

  .timeline-item--text-only {
    margin-bottom: 1.45rem;
  }

  .timeline-item--text-only .timeline-item__marker {
    top: 1.7rem;
  }

  .timeline-item__marker {
    left: 1.55rem;
  }

  .timeline-card,
  .timeline-item:nth-of-type(even) .timeline-card,
  .timeline-item--text-only .timeline-card,
  .timeline-item--text-only:nth-of-type(even) .timeline-card {
    float: none;
    width: auto;
    margin: 0 0 0 3.3rem;
    transform: translateX(1.5rem);
  }

  .timeline-media,
  .timeline-item:nth-of-type(even) .timeline-media {
    float: none;
    width: auto;
    margin: 1rem 0 0 3.3rem;
    transform: translateX(1.5rem);
  }

  .timeline-item--text-only.is-visible .timeline-card {
    transform: translateX(0);
  }

  .timeline-card::after,
  .timeline-item:nth-of-type(even) .timeline-card::after,
  .timeline-item--text-only .timeline-card::after,
  .timeline-item--text-only:nth-of-type(even) .timeline-card::after {
    content: "";
    right: auto;
    left: -15px;
    border-width: 10px 15px 10px 0;
    border-color: transparent var(--surface) transparent transparent;
  }
}

@media (max-width: 520px) {
  .site-header {
    min-height: 62vh;
    padding: 5rem 1rem 4rem;
  }

  .lede {
    font-size: 1rem;
  }

  .toolbar {
    top: 0;
    gap: 0.55rem;
    padding: 0.6rem;
    margin-left: -0.2rem;
    margin-right: -0.2rem;
    margin-bottom: 1.75rem;
    border-radius: 0 0 8px 8px;
  }

  .search {
    max-width: none;
  }

  .era-nav {
    flex-wrap: nowrap;
    gap: 0.3rem;
    margin: 0 -0.6rem;
    padding: 0 0.6rem 0.15rem;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
  }

  .era-nav__button {
    flex: 0 0 auto;
    min-height: 1.85rem;
    padding: 0.3rem 0.5rem;
    font-size: 0.68rem;
    white-space: nowrap;
  }

  .timeline-card {
    padding: 1rem;
  }

  .timeline-card__date {
    margin: -1rem -1rem 0.85rem auto;
  }

  .timeline-card__facts div {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .pswp__custom-caption {
    bottom: 0.5rem;
    width: calc(100% - 1rem);
  }
}