:root {
  color-scheme: light;
  --page-bg: #dde1e4;
  --card-bg: #dde1e4;
  --nested-bg: #dde1e4;
  --input-bg: #f0f3f5;
  --button-bg: #e8ecef;
  --page-text: #1f2933;
  --page-muted: #4f5d68;
  --page-border: #aab6bc;
  --text: #1f2933;
  --muted: #4f5d68;
  --border: #aab9bc;
  --subtle-border: #c4d5d3;
  --accent: #9db7d2;
  --accent-ink: #1c344b;
  --danger: #a61b1b;
  --danger-border: #c87c7c;
  --danger-hover: #f2caca;
  --valid-bg: #c9dfcf;
  --valid-border: #75a281;
  --valid-text: #1d542a;
  --invalid-bg: #edd0cc;
  --invalid-border: #c77e75;
  --invalid-text: #70170f;
  --preview-bg: #252b31;
  --preview-text: #e5edf4;
  --arrow-filter: none;
  --control-radius: 8px;
  --card-radius: 12px;
  --nested-radius: 10px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--page-bg);
  font-synthesis: none;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --page-bg: #363e44;
  --card-bg: #1b1f22;
  --nested-bg: #1b1f22;
  --input-bg: #242b2f;
  --button-bg: #252d31;
  --page-text: #fffff0;
  --page-muted: #dce6e9;
  --page-border: #829197;
  --text: #fffff0;
  --muted: #cbd4d7;
  --border: #505b61;
  --subtle-border: #333b3f;
  --accent: #c0e0de;
  --accent-ink: #173530;
  --danger: #ffb4ab;
  --danger-border: #c8837d;
  --danger-hover: #754845;
  --valid-bg: #405f49;
  --valid-border: #81b28e;
  --valid-text: #e0f4e5;
  --invalid-bg: #704743;
  --invalid-border: #d3958d;
  --invalid-text: #ffe5e1;
  --preview-bg: #303030;
  --preview-text: #fffff0;
  --arrow-filter: invert(1);
}

* { box-sizing: border-box; }

body { background: var(--page-bg); color: var(--page-text); margin: 0; }

button, input, textarea { font: inherit; }

button {
  border: 2px solid var(--border);
  border-radius: var(--control-radius);
  background: var(--button-bg);
  color: var(--text);
  cursor: pointer;
  padding: 0.55rem 0.8rem;
}

button:hover { border-color: var(--accent); }
button:disabled { cursor: not-allowed; opacity: 0.5; }

.site-header, main {
  width: min(1100px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  align-items: center;
  display: flex;
  justify-content: center;
  padding: 4.25rem 0 1.5rem;
  text-align: center;
}

.site-header-title {
  align-items: center;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.site-header-controls {
  position: fixed;
  right: 1rem;
  top: 1rem;
  z-index: 20;
}

.theme-toggle {
  align-items: center;
  background: transparent;
  border-color: var(--page-border);
  display: inline-flex;
  gap: 0.55rem;
  padding: 0.35rem 0.45rem;
}

.theme-toggle:hover { border-color: var(--accent); }

.theme-toggle-track {
  background: var(--page-border);
  border-radius: 999px;
  display: block;
  height: 1.35rem;
  padding: 0.15rem;
  transition: background 140ms ease;
  width: 2.45rem;
}

.theme-toggle-thumb {
  background: var(--card-bg);
  border-radius: 50%;
  display: block;
  height: 1.05rem;
  transform: translateX(0);
  transition: transform 140ms ease;
  width: 1.05rem;
}

.theme-toggle[aria-checked="true"] .theme-toggle-track { background: var(--accent); }
.theme-toggle[aria-checked="true"] .theme-toggle-thumb { transform: translateX(1.1rem); }

h1, h2, h3, p { margin-top: 0; }
h1 {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  line-height: 1.05;
  margin-bottom: 0;
}
.theme-toggle { color: var(--page-text); }

.status {
  border: 0;
  color: var(--page-muted);
  flex: 0 0 auto;
  font-size: 0.8rem;
  padding: 0;
}

main { padding-bottom: 4rem; }

.card, .article-card, .repeatable-item {
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: var(--card-radius);
  color: var(--text);
}

.card { margin-bottom: 1rem; padding: 1.25rem; }

.actions, .section-header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.section-heading, .article-heading, .repeatable-heading, .repeatable-item-header {
  align-items: center;
  display: grid;
  gap: 1rem;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr) minmax(0, 1fr);
}

.section-heading > :first-child,
.article-heading > :first-child,
.repeatable-heading > :first-child,
.repeatable-item-header > :first-child {
  grid-column: 2;
  justify-self: center;
  text-align: center;
}

.section-heading > :last-child,
.article-heading > :last-child,
.repeatable-heading > :last-child,
.repeatable-item-header > :last-child {
  grid-column: 3;
  justify-self: end;
}

.section-header-actions {
  flex-wrap: nowrap;
  justify-content: flex-end;
  min-width: 0;
}

.section-header-actions p { margin: 0; }

.section-heading { margin-bottom: 1rem; }
.section-heading h2 {
  font-size: 1.75rem;
  line-height: 1.15;
  margin-bottom: 0;
}
.article-heading h3 {
  font-size: 1.35rem;
  line-height: 1.2;
  margin-bottom: 0;
}
.section-heading p { color: var(--muted); margin-bottom: 0; }
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.metadata-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 0.9rem;
}

.field { display: flex; flex-direction: column; gap: 0.35rem; }
.field.wide { grid-column: 1 / -1; }
.field label { font-size: 0.85rem; font-weight: 650; }
.hint, .error { font-size: 0.75rem; }
.hint { color: var(--muted); }
.error { color: var(--danger); min-height: 1em; }

input, textarea {
  background: var(--input-bg);
  border: 2px solid var(--border);
  border-radius: var(--control-radius);
  color: var(--text);
  padding: 0.65rem 0.7rem;
  width: 100%;
}

textarea { min-height: 7rem; resize: vertical; }
input:focus, textarea:focus, button:focus, summary:focus {
  outline: none;
}

input:focus-visible, textarea:focus-visible, button:focus-visible, summary:focus-visible {
  border: 3px solid var(--accent);
  box-shadow: none;
}

[aria-invalid="true"] { border-color: var(--danger); }

.article-card { margin-top: 1rem; padding: 1rem; }
.article-card:first-child { margin-top: 0; }
.article-heading { border-bottom: 2px solid var(--subtle-border); margin-bottom: 1rem; padding-bottom: 0.8rem; }
.article-heading h3 {
  max-width: 100%;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
}
.small-actions {
  align-items: center;
  display: flex;
  flex: 0 0 auto;
  flex-wrap: nowrap;
  gap: 0.4rem;
}

.icon-button, .collapse-toggle {
  align-items: center;
  display: inline-flex;
  flex: 0 0 auto;
  height: 2.25rem;
  justify-content: center;
  min-width: 2.25rem;
  padding: 0.35rem;
}

.icon-button[data-action^="move-"],
.icon-button[data-action^="move-"]:hover {
  background: transparent;
  border-color: transparent;
}

.remove-button {
  border-color: var(--danger-border);
  color: var(--danger);
  font-size: 1.2rem;
  font-weight: 700;
}

.remove-button:hover { background: var(--danger-hover); border-color: var(--danger); }
.collapse-toggle {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
}
.collapse-toggle:hover {
  background: transparent;
  border-color: transparent;
}
.collapse-toggle::before {
  background: url("./assets/keyboard-arrow-down.svg") center / contain no-repeat;
  content: "";
  display: block;
  height: 1.25rem;
  filter: var(--arrow-filter);
  opacity: 0.68;
  transition: transform 140ms ease;
  width: 1.25rem;
}
.collapse-toggle.is-collapsed::before { transform: rotate(-90deg); }
.collapse-toggle:hover::before { opacity: 0.9; }
.collapsible-content[hidden] { display: none; }

.repeatable-section {
  border-top: 2px solid var(--subtle-border);
  margin-top: 1.2rem;
  padding-top: 1rem;
}

[data-role="authors-section"],
[data-role="reference-authors-section"] {
  border-top: 0;
  padding-top: 0;
}

.author-list {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.author-item {
  background: var(--nested-bg);
  border: 2px solid var(--border);
  border-radius: var(--nested-radius);
  display: block;
  margin-top: 0;
  padding: 0.8rem;
}

.author-item > .repeatable-item-header {
  align-items: center;
  display: flex;
  flex-direction: row;
  gap: 0.6rem;
  justify-content: space-between;
  margin: 0 0 0.55rem;
  min-width: 0;
  width: 100%;
}

.author-item > .repeatable-item-header > :first-child {
  align-self: auto;
  flex: 0 1 auto;
  min-width: 0;
  text-align: left;
}

.author-item > .repeatable-item-header > :last-child {
  align-self: auto;
  margin-left: auto;
}

.author-item .remove-button,
.author-item .remove-button:hover {
  background: transparent;
  border-color: transparent;
}

.author-item > .author-details {
  margin-top: 0;
  min-width: 0;
}

.author-fields {
  display: grid;
  gap: 0.45rem 0.65rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.reference-author-fields {
  grid-template-columns: 1fr;
}

.author-fields .field {
  gap: 0.2rem;
}

.author-fields .field.wide {
  grid-column: auto;
}

.author-fields .field label {
  font-size: 0.78rem;
}

.author-fields input {
  padding: 0.42rem 0.55rem;
}

.author-fields .hint,
.author-fields .error {
  font-size: 0.68rem;
  min-height: 0.8em;
}

.repeatable-heading { margin-bottom: 0.75rem; }
.repeatable-heading h4 {
  font-size: 1.15rem;
  line-height: 1.2;
  margin: 0;
}
.repeatable-item { background: var(--nested-bg); border-radius: var(--nested-radius); margin-top: 0.7rem; padding: 0.8rem; }
.repeatable-item.author-item {
  background: var(--nested-bg);
  border: 2px solid var(--border);
  border-radius: var(--nested-radius);
  margin-top: 0;
  padding: 0.8rem;
}
.repeatable-item-header { margin-bottom: 0.65rem; }
.repeatable-item-header strong {
  font-size: 1rem;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.repeatable-item:not(.author-item) > .repeatable-item-header strong {
  max-width: 100%;
  width: 100%;
}

.is-collapsed > .section-heading,
.is-collapsed > .article-heading,
.is-collapsed > .repeatable-heading,
.is-collapsed > .repeatable-item-header {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.validation-summary {
  border: 2px solid var(--border);
  border-radius: var(--control-radius);
  color: var(--muted);
  margin-bottom: 1rem;
  padding: 0.85rem;
}

.validation-summary.invalid { background: var(--invalid-bg); border-color: var(--invalid-border); color: var(--invalid-text); }
.validation-summary.valid { background: var(--valid-bg); border-color: var(--valid-border); color: var(--valid-text); }
.validation-summary ul { margin-bottom: 0; }

.actions { justify-content: flex-end; }
.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.secondary { background: var(--button-bg); }

details { margin-top: 1rem; }
summary {
  border: 2px solid var(--border);
  border-radius: var(--control-radius);
  cursor: pointer;
  display: inline-block;
  font-weight: 650;
  padding: 0.35rem 0.55rem;
}
pre {
  background: var(--preview-bg);
  border: 2px solid var(--border);
  border-radius: var(--nested-radius);
  color: var(--preview-text);
  max-height: 32rem;
  overflow: auto;
  padding: 1rem;
  white-space: pre;
}

@media (max-width: 700px) {
  .section-heading, .article-heading, .repeatable-heading, .repeatable-item-header {
    display: flex;
    flex-direction: column;
  }
  .section-heading > :first-child,
  .article-heading > :first-child,
  .repeatable-heading > :first-child,
  .repeatable-item-header > :first-child {
    align-self: center;
  }
  .section-heading > :last-child,
  .article-heading > :last-child,
  .repeatable-heading > :last-child,
  .repeatable-item-header > :last-child {
    align-self: center;
  }
  .section-header-actions { align-items: center; justify-content: center; width: 100%; }
  .author-item {
    display: block;
  }
  .author-item > .repeatable-item-header {
    align-items: center;
    flex-direction: row;
  }
  .author-item > .repeatable-item-header > :first-child {
    align-self: auto;
    text-align: left;
  }
  .author-item > .repeatable-item-header > :last-child {
    align-self: auto;
  }
  .author-item > .author-details {
    margin-top: 0;
  }
  .form-grid, .metadata-grid { grid-template-columns: 1fr; }
  .field.wide { grid-column: auto; }
}