:root {
  --bg: #fafaf9;
  --fg: #1f1f1f;
  --muted: #6b7280;
  --accent: #2563eb;
  --border: #e5e7eb;
  --error: #b91c1c;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.45;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

header h1 {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 600;
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  /* Tight bottom margin so the subtitle (h4) sits visually attached
     to the title; the h4 itself owns the spacing to whatever comes
     after the header. */
  margin: 0 0 .15rem;
}

header h4 {
  margin: 0 0 .9rem;
  font-size: 1rem;
  font-weight: 400;
  font-style: italic;
  color: var(--muted);
  line-height: 1.3;
}

.repo-link {
  color: var(--muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color .15s ease;
}

.repo-link:hover,
.repo-link:focus-visible {
  color: var(--fg);
  outline: none;
}

.repo-link svg,
.repo-link img { display: block; }

/* The official RO-Crate logo has its own brand colors and shouldn't
   inherit the muted->fg hover transition from .repo-link. Restore
   it to full opacity on hover instead. */
.rocrate-link { opacity: .75; transition: opacity .15s ease; }
.rocrate-link:hover,
.rocrate-link:focus-visible { opacity: 1; }

.header-links {
  display: inline-flex;
  gap: .5rem;
  align-items: center;
}

.hint {
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: .95rem;
}

ul.hint {
  padding-left: 1.25rem;
  margin: 0 0 1.5rem;
}

ul.hint li {
  margin: .2rem 0;
}

.hint-details {
  margin: 0 0 1.5rem;
}

.hint-details > summary {
  cursor: pointer;
  color: var(--muted);
  font-size: .9rem;
  user-select: none;
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  /* Hide the default marker; we draw our own rotating chevron. */
  list-style: none;
}

.hint-details > summary::-webkit-details-marker {
  display: none;
}

.hint-details > summary::before {
  content: "";
  display: inline-block;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 4px 0 4px 6px;
  border-color: transparent transparent transparent currentColor;
  transition: transform .15s ease;
}

.hint-details[open] > summary::before {
  transform: rotate(90deg);
}

.hint-details > summary:hover {
  color: var(--fg);
}

.hint-details > .hint {
  margin: .6rem 0 0;
}

.hint code,
.hint .example-link {
  background: #f1f5f9;
  padding: .1em .3em;
  border-radius: 3px;
  font-size: .9em;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

.hint .example-link {
  border: none;
  cursor: pointer;
  color: inherit;
  line-height: inherit;
  /* Inherits parent's text wrapping. */
}

.hint .example-link:hover,
.hint .example-link:focus-visible {
  background: #cbd5e1;
  outline: none;
}

.hint kbd {
  background: #f1f5f9;
  border: 1px solid #cbd5e1;
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 .3em;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: .85em;
  color: var(--fg);
}

.controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-bottom: 1.5rem;
}

.ctrl-block {
  display: flex;
  flex-direction: column;
  font-size: .85rem;
  color: var(--muted);
  font-weight: 500;
}

.ctrl-block.grow { flex: 1; min-width: 280px; }

.ctrl-block > label {
  margin-bottom: .25rem;
}

.ctrl-block > select,
.ctrl-block > input {
  padding: .5rem .65rem;
  font-size: 1rem;
  line-height: 1.45;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: white;
  color: var(--fg);
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

.ctrl-block > select:focus,
.ctrl-block > input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* Glued horizontal group of inputs / icon buttons. Children sit
   flush against each other (zero gap, shared border) so visually
   they read as one compound control. Outer corners stay rounded;
   inner edges square. */
.input-group {
  display: flex;
}

.input-group > * {
  border: 1px solid var(--border);
  border-radius: 0;
  margin: 0;
  /* Match the standalone-input metrics so the row height is uniform. */
  padding: .5rem .65rem;
  font-size: 1rem;
  line-height: 1.45;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  background: white;
  color: var(--fg);
}

.input-group > input {
  flex: 1;
  min-width: 0;
}

.input-group > :first-child {
  border-top-left-radius: 6px;
  border-bottom-left-radius: 6px;
}

.input-group > :last-child {
  border-top-right-radius: 6px;
  border-bottom-right-radius: 6px;
}

/* Collapse shared borders so the seam is a single line. */
.input-group > * + * {
  border-left: 0;
}

.input-group > *:focus,
.input-group > *:focus-visible {
  /* Lift the focused child above its neighbours so the focus ring
     isn't clipped by the next-sibling's missing left border. */
  z-index: 2;
  position: relative;
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* Generic icon-only button inside a `.input-group`. Padding is
   symmetrical so a 16x16 icon sits balanced; height matches the
   adjacent text inputs because `.input-group > *` already pins the
   shared metrics. */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .5rem !important;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}

.icon-btn:hover:not(:disabled) { background: #f1f5f9; }

.icon-btn:disabled {
  opacity: .45;
  cursor: not-allowed;
}

.icon-btn svg { display: block; flex-shrink: 0; }

/* "Copied" flash on the share button. */
#share-btn.copied {
  background: #d1fae5 !important;
  border-color: #6ee7b7 !important;
  color: #065f46;
}

.ctrl-block.db-control {
  width: 12rem;
}

/* Hide the native number spinners: desktop browsers render their own
   up/down arrows inside the input while mobile ones render nothing,
   so we'd get two pairs of steppers on PC and none on phones. The
   explicit -/+ icon buttons flanking the input are the one stepper
   UI shown everywhere. */
#rat-id {
  appearance: textfield;
  -moz-appearance: textfield;
}
#rat-id::-webkit-inner-spin-button,
#rat-id::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* Custom tooltips: trigger via [data-tooltip] on any element, shown
   on hover (desktop) or after a long-press (mobile, via the
   `.tip-visible` class set by the JS long-press handler). We avoid
   the native `title` attribute because mobile browsers don't expose
   it. */
[data-tooltip] {
  position: relative;
}

[data-tooltip]:hover::after,
[data-tooltip].tip-visible::after {
  content: attr(data-tooltip);
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: .3rem;
  z-index: 100;
  background: #1f2937;
  color: #f9fafb;
  padding: .35rem .55rem;
  border-radius: 4px;
  font-size: .8rem;
  font-style: normal;
  font-weight: 400;
  line-height: 1.35;
  white-space: normal;
  max-width: 16rem;
  min-width: max-content;
  pointer-events: none;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .15);
}

.db-label-hint {
  /* Subtle dotted underline + help-cursor over the label text so it
     reads as "hover me for more info" without screaming for
     attention. Title attribute on the outer label provides the
     actual tooltip text. */
  text-decoration: underline dotted currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  cursor: help;
}
.db-control.disabled {
  opacity: .45;
}
.db-control.disabled .input-group {
  pointer-events: none;
}

.db-id-invalid {
  /* Brief red flash to signal an out-of-range ID lookup. The native
     `title` on the label still shows the valid range; this is just
     a transient visual cue. */
  border-color: var(--error) !important;
  background: #fef2f2 !important;
  animation: db-id-flash .4s ease-out;
}
@keyframes db-id-flash {
  from { background: #fee2e2; }
  to   { background: #fef2f2; }
}

.db-note {
  color: var(--muted);
  font-style: italic;
}

.db-na {
  /* Same visual affordance as `.db-label-hint`: dotted underline
     + help cursor signal "hover me for an explanation". The
     `title` attribute carries the actual reason. */
  text-decoration: underline dotted currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  cursor: help;
  color: var(--muted);
  font-style: italic;
}

.db-bug {
  /* Within-envelope DB miss -- almost certainly a bug. Distinct
     red styling separates it from the muted `db-na` (which is a
     legitimate out-of-envelope miss). Renders as an anchor with
     a solid underline + pointer cursor so it reads as
     "click me to do something" (file an issue), and the tooltip
     spells out the bug-report framing. */
  color: var(--error);
  text-decoration: underline solid currentColor;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 2px;
  cursor: pointer;
  font-weight: 600;
}

.db-bug:hover,
.db-bug:focus {
  /* Stronger emphasis on hover to reinforce that this is the bug
     report path, not an ordinary link. */
  color: var(--error);
  filter: brightness(1.15);
}

.rat-explorer-info dl.db-row {
  margin-top: 1rem;
  padding-top: .8rem;
  border-top: 1px solid var(--border);
}

.rat-explorer-result {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18rem;
  gap: 1.5rem;
  align-items: start;
}

@media (max-width: 720px) {
  .rat-explorer-result { grid-template-columns: 1fr; }
}

.rat-explorer-svg {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: white;
  padding: .5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  /* Reserve all touch gestures inside the SVG for the rat_explorer
     swipe handler. The page can still be scrolled by touching
     anywhere outside this box. */
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  -webkit-tap-highlight-color: transparent;
}

/* Make sure touch-action propagates to the inner <svg> and its
   children -- some browsers consult the property on the actual
   touch target rather than the ancestor. */
.rat-explorer-svg, .rat-explorer-svg * {
  touch-action: none;
}

/* The inner <svg> element is replaced on every preview update.
   Mark it as `pointer-events: none` so the user's finger lands on
   the stable wrapper div instead -- otherwise the touch target
   gets detached on the first re-render, the browser fires
   touchcancel, and no further touchmove events are delivered for
   the gesture. */
.rat-explorer-svg > svg {
  pointer-events: none;
}

.rat-explorer-svg svg {
  width: 100%;
  height: auto;
  max-width: 480px;
}

.rat-explorer-info {
  padding: 1rem 1.25rem;
  background: white;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .95rem;
}

.rat-explorer-info dl {
  margin: 0;
}

.rat-explorer-info dl.info-notes {
  margin-top: 1rem;
  padding-top: .8rem;
  border-top: 1px solid var(--border);
}

.rat-explorer-info dt {
  color: var(--muted);
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .04em;
  margin-top: .75rem;
}

.rat-explorer-info dl > dt:first-child { margin-top: 0; }

.rat-explorer-info dd {
  margin: .1rem 0 0;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}

.rat-explorer-info dd strong { color: var(--accent); }

/* Inline copyable-and-clickable spans (canonical sequences, the
   "chiral" label, ...). Subtle dotted underline hints at the
   click target without preventing text selection -- selecting the
   span to copy still works, only an empty-selection click loads. */
.loadable {
  cursor: pointer;
  text-decoration: underline dotted currentColor;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.loadable:hover {
  text-decoration-style: solid;
  background: #fef3c7;
  border-radius: 2px;
}

.rat-explorer-error { color: var(--error); }