/* ==========================================================================
   Research radar: the page at /radar/ and the strip for the Home page.

   Colours, sizes, spaces and timings come from the tokens in dimms.css.
   Each token is read with a fallback, so these styles look the same before
   and after the shared scale (--space-*, --text-*, --dur-*) is in place.
   ========================================================================== */

.dl-radar,
.dl-radarsources,
.dl-radarstrip {
  --r-label: var(--text-label, 0.75rem);
  --r-small: var(--text-small, 0.875rem);
  --r-body: var(--text-body, 1.0625rem);
  --r-h4: var(--text-h4, clamp(1.25rem, 1.19rem + 0.25vw, 1.375rem));
  --r-h3: var(--text-h3, clamp(1.375rem, 1.2rem + 0.75vw, 1.75rem));
  --r-1: var(--space-1, 4px);
  --r-2: var(--space-2, 8px);
  --r-3: var(--space-3, 12px);
  --r-4: var(--space-4, 16px);
  --r-5: var(--space-5, 24px);
  --r-6: var(--space-6, 32px);
  --r-7: var(--space-7, 48px);
  --r-8: var(--space-8, 64px);
  --r-quick: var(--dur-2, 180ms);
  --r-slow: var(--dur-4, 450ms);
  --r-rail: 200px;
}

/* Subscripts and superscripts in titles (maths, chemical formulas) */
.dl-radar sub,
.dl-radar sup,
.dl-radarstrip sub,
.dl-radarstrip sup { font-size: 0.7em; line-height: 0; }

/* 1. The page
   -------------------------------------------------------------------------- */

/* "Updated on" and the note about how long items stay */
.dl-radarbar {
  display: grid;
  grid-template-columns: minmax(var(--r-rail), max-content) minmax(0, 1fr);
  column-gap: var(--r-6);
  align-items: start;
  padding-bottom: var(--r-6);
}

.dl-radarbar__updated { display: grid; gap: var(--r-2); margin: 0; }

.dl-radarbar__label,
.dl-radarfilters__label,
.dl-radarday__weekday,
.dl-radarhead__count,
.dl-radarsources__label {
  font-family: var(--font-mono);
  font-size: var(--r-label);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.dl-radarbar__label { color: var(--gold); }

.dl-radarbar__updated time {
  font-family: var(--font-serif);
  font-size: var(--r-h4);
  line-height: 1.25;
  letter-spacing: -0.008em;
  white-space: nowrap;
  font-variant-numeric: lining-nums;
}

.dl-radarbar__note {
  max-width: 68ch;
  margin: 0;
  padding-top: var(--r-1);
  font-size: var(--r-small);
  line-height: 1.5;
  color: var(--ink-2);
}

/* Filters. They need the script, so they are not shown where scripts are switched off. */
.dl-radarfilters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--r-3) var(--r-7);
  padding-block: var(--r-4);
  border-top: 1px solid var(--rule);
}
.dl-radarfilters[hidden] { display: none; }
@media (scripting: none) {
  .dl-radarfilters { display: none; }
}

.dl-radarfilters__group { display: flex; flex-wrap: wrap; align-items: center; gap: var(--r-2); }
.dl-radarfilters__label { margin-right: var(--r-2); color: var(--ink-3); }

.dl-radarfilters__count {
  margin: 0 0 0 auto;
  font-size: var(--r-small);
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* Days */
.dl-radardays[hidden] { display: none; }

.dl-radarday {
  display: grid;
  grid-template-columns: var(--r-rail) minmax(0, 1fr);
  column-gap: var(--r-6);
  padding-block: var(--r-6) var(--r-7);
  border-top: 1px solid var(--rule-strong);
}
.dl-radarday[hidden] { display: none; }

.dl-radarday__label {
  position: sticky;
  top: calc(var(--nav-h) + var(--r-5));
  align-self: start;
  display: grid;
  gap: var(--r-2);
}
.dl-radarday__weekday { font-family: var(--font-mono); color: var(--gold); }
.dl-radarday__date {
  font-size: var(--r-h3);
  line-height: 1.2;
  letter-spacing: -0.012em;
  font-variant-numeric: lining-nums;
}

/* Items. The rule and the space sit above every visible item except the first, so a
   filtered list stays aligned with its date. */
.dl-radaritem {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  column-gap: var(--r-6);
  align-items: start;
}
.dl-radaritem > * { grid-column: 1; }
.dl-radaritem[hidden] { display: none; }
.dl-radaritem:not([hidden]) ~ .dl-radaritem:not([hidden]) {
  margin-top: var(--r-5);
  padding-top: var(--r-5);
  border-top: 1px solid var(--rule);
}

.dl-radaritem__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--r-1) var(--r-4);
  margin: 0 0 var(--r-3);
  font-family: var(--font-mono);
  font-size: var(--r-label);
  line-height: 1.5;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.dl-radaritem__source { font-weight: 500; color: var(--ink); }
.dl-radaritem__kind { color: var(--gold); }
.dl-radaritem__kind--preprint {
  padding: 0 var(--r-2);
  border: 1px solid currentColor;
  border-radius: var(--radius);
}

.dl-radaritem__title {
  max-width: 62ch;
  font-size: var(--r-h4);
  line-height: 1.25;
  letter-spacing: -0.008em;
  text-wrap: pretty;
}
.dl-radaritem__title a { text-decoration: none; }
.dl-radaritem__title a > span {
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size var(--r-slow) var(--ease-out), color var(--r-quick);
}
.dl-radaritem__title a:hover > span { background-size: 100% 1px; color: var(--teal); }
.dl-radaritem__title .dl-icon {
  width: 0.7em;
  height: 0.7em;
  margin-left: 0.35em;
  vertical-align: 0;
  color: var(--ink-3);
  transition: transform var(--r-quick) var(--ease), color var(--r-quick);
}
.dl-radaritem__title a:hover .dl-icon { color: var(--teal); transform: translate(2px, -2px); }

.dl-radaritem__abstract {
  max-width: 68ch;
  margin: var(--r-3) 0 0;
  font-size: var(--r-small);
  line-height: 1.6;
  color: var(--ink-2);
}

/* Subjects sit in their own column at the right, level with the first line of the item. */
.dl-radaritem > .dl-radaritem__topics {
  grid-column: 2;
  grid-row: 1 / span 3;
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--r-2);
  max-width: 22rem;
  margin: 0;
}

/* Nothing matches the filters; the radar is off, empty or out of date */
.dl-radarempty,
.dl-radarstate,
.dl-radar__stale {
  display: grid;
  justify-items: center;
  gap: var(--r-5);
  padding-block: var(--r-8);
  text-align: center;
}
.dl-radarempty[hidden],
.dl-radar__stale[hidden] { display: none; }
.dl-radarempty { border-top: 1px solid var(--rule-strong); }
.dl-radar__stale { border-top: 1px solid var(--rule); }

.dl-radarempty p,
.dl-radarstate p,
.dl-radar__stale p {
  max-width: 34ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--r-h3);
  line-height: 1.3;
  color: var(--ink-2);
  text-wrap: balance;
}
.dl-radarempty button { border: 0; padding-inline: 0; cursor: pointer; }

/* 2. Sources and the note about the list
   -------------------------------------------------------------------------- */

.dl-radarhead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--r-5);
  padding-bottom: var(--r-4);
  border-bottom: 1px solid var(--rule-strong);
}
.dl-radarhead__title { font-size: var(--r-h3); line-height: 1.2; }
.dl-radarhead__count { margin: 0; color: var(--ink-3); }

.dl-radarsources__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--r-6) var(--r-5);
  padding-top: var(--r-6);
}
.dl-radarsources__label { margin-bottom: var(--r-3); font-family: var(--font-mono); color: var(--gold); }
.dl-radarsources__group ul { display: grid; gap: var(--r-1); margin: 0; padding: 0; list-style: none; }
.dl-radarsources__group a {
  display: inline-block;
  padding-block: var(--r-1);
  font-size: var(--r-small);
  line-height: 1.4;
  color: var(--ink);
  text-decoration: none;
  background: linear-gradient(currentColor, currentColor) 0 calc(100% - 3px) / 0 1px no-repeat;
  transition: background-size var(--r-slow) var(--ease-out), color var(--r-quick);
}
.dl-radarsources__group a:hover { background-size: 100% 1px; color: var(--teal); }
.dl-radarsources__group a .dl-icon { width: 0.8em; height: 0.8em; margin-left: 0.35em; vertical-align: -0.05em; color: var(--ink-3); }
.dl-radarsources__status {
  display: flex;
  align-items: center;
  gap: var(--r-2);
  padding-bottom: var(--r-1);
  font-size: var(--r-label);
  line-height: 1.3;
  color: var(--ink-3);
}
.dl-radarsources__status::before {
  content: "";
  flex: none;
  width: calc(var(--r-1) * 1.5);
  height: calc(var(--r-1) * 1.5);
  border-radius: 50%;
  background: var(--coral);
}

.dl-radarabout {
  display: grid;
  grid-template-columns: var(--r-rail) minmax(0, 1fr);
  column-gap: var(--r-6);
  margin-top: var(--r-7);
  padding-top: var(--r-5);
  border-top: 1px solid var(--rule);
}
.dl-radarabout__title { font-size: var(--r-h4); line-height: 1.25; }
.dl-radarabout p { max-width: 68ch; margin: 0; font-size: var(--r-small); line-height: 1.6; color: var(--ink-2); }

/* 3. The strip
   -------------------------------------------------------------------------- */

.dl-radarstrip {
  --radar-bg: var(--paper-sunk);
  --radar-ink: var(--ink);
  --radar-ink-3: var(--ink-3);
  --radar-rule: var(--rule-strong);
  --radar-accent: var(--gold);
  --radar-hover: var(--teal);
  --radar-height: calc(var(--r-7) + var(--r-2));
  position: relative;
  background: var(--radar-bg);
  color: var(--radar-ink);
  border-block: 1px solid var(--rule);
}
.dl-radarstrip--night {
  --radar-bg: var(--night-2);
  --radar-ink: var(--on-night);
  --radar-ink-3: var(--on-night-2);
  --radar-rule: color-mix(in srgb, var(--on-night) 24%, transparent);
  --radar-accent: var(--gold-soft);
  --radar-hover: var(--gold-soft);
  border-block-color: color-mix(in srgb, var(--on-night) 12%, transparent);
}
.dl-radarstrip[hidden] { display: none; }

.dl-radarstrip__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  height: var(--radar-height);
}

/* The label and the controls sit above the moving track, which is cut off at their edges. */
.dl-radarstrip__head,
.dl-radarstrip__tools { position: relative; z-index: 1; }

.dl-radarstrip__head {
  align-self: stretch;
  display: grid;
  align-content: center;
  gap: var(--r-1);
  padding-right: var(--r-5);
  border-right: 1px solid var(--radar-rule);
}
.dl-radarstrip__label {
  font-family: var(--font-mono);
  font-size: var(--r-label);
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--radar-accent);
}
.dl-radarstrip__updated {
  margin: 0;
  font-size: var(--r-label);
  line-height: 1.3;
  white-space: nowrap;
  color: var(--radar-ink-3);
  font-variant-numeric: lining-nums;
}

/* Without the script, or with "reduce motion", the list stands still and scrolls sideways.
   The scroll bar is shown only in those two cases, so nothing moves when the script takes over. */
.dl-radarstrip__viewport {
  align-self: stretch;
  display: flex;
  align-items: center;
  min-width: 0;
  padding-left: var(--r-5);
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-x: contain;
  scrollbar-width: none;
}
.dl-radarstrip__viewport::-webkit-scrollbar { display: none; }
@media (prefers-reduced-motion: reduce), (scripting: none) {
  .dl-radarstrip__viewport { scrollbar-width: thin; scrollbar-color: var(--radar-rule) transparent; }
  .dl-radarstrip__viewport::-webkit-scrollbar { display: block; height: var(--r-2); }
  .dl-radarstrip__viewport::-webkit-scrollbar-thumb { border-radius: var(--radius); background: var(--radar-rule); }
}
.dl-radarstrip__track { display: flex; flex: none; }
.dl-radarstrip__list { display: flex; flex: none; align-items: center; margin: 0; padding: 0; list-style: none; }
.dl-radarstrip__item { display: flex; flex: none; align-items: center; }
.dl-radarstrip__item::after {
  content: "";
  flex: none;
  width: 1px;
  height: var(--r-4);
  margin-inline: var(--r-5);
  background: var(--radar-rule);
}

.dl-radarstrip__link {
  display: inline-flex;
  align-items: baseline;
  gap: var(--r-3);
  padding-block: var(--r-2);
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}
.dl-radarstrip__source,
.dl-radarstrip__date {
  font-family: var(--font-mono);
  font-size: var(--r-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.dl-radarstrip__source { font-weight: 500; color: var(--radar-accent); }
.dl-radarstrip__date { color: var(--radar-ink-3); }
.dl-radarstrip__title {
  font-size: var(--r-small);
  font-weight: 500;
  line-height: 1.4;
  background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat;
  transition: background-size var(--r-slow) var(--ease-out), color var(--r-quick);
}
.dl-radarstrip__link:hover .dl-radarstrip__title { background-size: 100% 1px; color: var(--radar-hover); }

/* With the script and with motion allowed, the list glides. */
.dl-radarstrip.is-gliding .dl-radarstrip__viewport {
  overflow: hidden;
  touch-action: pan-y;
  cursor: grab;
  -webkit-mask-image: linear-gradient(to right, transparent, black var(--r-6), black calc(100% - var(--r-6)), transparent);
  mask-image: linear-gradient(to right, transparent, black var(--r-6), black calc(100% - var(--r-6)), transparent);
}
.dl-radarstrip.is-gliding .dl-radarstrip__track { will-change: transform; }
.dl-radarstrip.is-dragging .dl-radarstrip__viewport { cursor: grabbing; }
.dl-radarstrip.is-dragging .dl-radarstrip__track { user-select: none; -webkit-user-select: none; }
.dl-radarstrip.is-dragging .dl-radarstrip__link { pointer-events: none; }

.dl-radarstrip__tools {
  align-self: stretch;
  display: flex;
  align-items: center;
  gap: var(--r-4);
  padding-left: var(--r-5);
  border-left: 1px solid var(--radar-rule);
}

.dl-radarstrip__toggle {
  display: inline-grid;
  place-items: center;
  width: calc(var(--r-6) + var(--r-1));
  height: calc(var(--r-6) + var(--r-1));
  padding: 0;
  border: 1px solid var(--radar-rule);
  border-radius: 50%;
  background: transparent;
  color: inherit;
  transition: border-color var(--r-quick), color var(--r-quick);
}
/* Hidden until there is something to pause, but its place is kept so nothing shifts.
   Where it is known from the start that nothing will move, it takes no room at all. */
.dl-radarstrip__toggle[hidden] { display: inline-grid; visibility: hidden; }
@media (prefers-reduced-motion: reduce), (scripting: none) {
  .dl-radarstrip__toggle[hidden] { display: none; }
}
.dl-radarstrip__toggle:hover { border-color: currentColor; }
.dl-radarstrip__toggle:active { transform: scale(0.94); }
.dl-radarstrip__toggle .dl-icon { width: var(--r-4); height: var(--r-4); }
.dl-radarstrip__pause,
.dl-radarstrip__play { display: contents; }
.dl-radarstrip__play,
.dl-radarstrip.is-paused .dl-radarstrip__pause { display: none; }
.dl-radarstrip.is-paused .dl-radarstrip__play { display: contents; }
.dl-radarstrip__play .dl-icon { fill: currentColor; }

.dl-radarstrip__all {
  display: inline-flex;
  align-items: center;
  gap: var(--r-2);
  padding-block: var(--r-2);
  font-size: var(--r-small);
  font-weight: 500;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--r-quick);
}
.dl-radarstrip__all:hover { color: var(--radar-hover); }
.dl-radarstrip__all .dl-icon { transition: transform var(--r-quick) var(--ease); }
.dl-radarstrip__all:hover .dl-icon { transform: translateX(3px); }

/* 4. Smaller screens
   -------------------------------------------------------------------------- */

@media (max-width: 1024px) {
  .dl-radar,
  .dl-radarsources { --r-rail: 160px; }
  .dl-radaritem { grid-template-columns: minmax(0, 1fr); }
  .dl-radaritem > .dl-radaritem__topics {
    grid-column: 1;
    grid-row: auto;
    justify-content: flex-start;
    max-width: none;
    margin-top: var(--r-4);
  }
  .dl-radarsources__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .dl-radarbar,
  .dl-radarday,
  .dl-radarabout { grid-template-columns: minmax(0, 1fr); row-gap: var(--r-4); }
  .dl-radarbar { padding-bottom: var(--r-5); }

  .dl-radarfilters { gap: var(--r-3) var(--r-5); }
  .dl-radarfilters__group { width: 100%; }
  .dl-radarfilters__label { width: 100%; margin: 0; }
  .dl-radarfilters .dl-chip { min-height: calc(var(--r-7) - var(--r-1)); padding-inline: var(--r-4); }
  .dl-radarfilters__count { margin-left: 0; }

  .dl-radarday { padding-block: var(--r-5) var(--r-6); }
  .dl-radarday__label {
    position: static;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--r-1) var(--r-3);
    margin-bottom: var(--r-2);
  }

  .dl-radarempty,
  .dl-radarstate,
  .dl-radar__stale { padding-block: var(--r-7); }

  .dl-radarstrip__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: auto var(--r-7);
    height: auto;
  }
  .dl-radarstrip__head {
    grid-area: 1 / 1;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0 var(--r-3);
    padding: var(--r-3) 0 0;
    border-right: 0;
  }
  .dl-radarstrip__tools { grid-area: 1 / 2; gap: var(--r-3); padding: var(--r-2) 0 0; border-left: 0; }
  .dl-radarstrip__viewport { grid-area: 2 / 1 / 3 / -1; padding-left: 0; }
  .dl-radarstrip__toggle { width: calc(var(--r-7) - var(--r-1)); height: calc(var(--r-7) - var(--r-1)); }
  .dl-radarstrip__all { min-height: calc(var(--r-7) - var(--r-1)); }
  .dl-radarstrip__link { padding-block: var(--r-3); }
}

@media (max-width: 480px) {
  .dl-radarsources__grid { grid-template-columns: minmax(0, 1fr); }
  .dl-radarhead { flex-wrap: wrap; }
}

@media (prefers-reduced-motion: reduce) {
  .dl-radar *,
  .dl-radarsources *,
  .dl-radarstrip * { transition: none !important; }
}