/* Regex Tester: dark theme, mobile first. */

:root {
  color-scheme: dark;
  --bg: #0f172a;
  --surface: #1e293b;
  --field: #111a2e;
  --raised: #273549;
  --border: #334155;
  --border-strong: #475569;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --faint: #64748b;
  --accent: #c4b5fd;
  --accent-rgb: 196 181 253;
  --accent-ink: #1e1b4b;
  --danger: #fda4af;
  --danger-rgb: 253 164 175;
  --warn-rgb: 252 211 77;
  --ok: #86efac;
  --radius: 12px;
  --radius-sm: 10px;
  --shadow: 0 1px 2px rgb(2 6 23 / 0.35), 0 10px 30px rgb(2 6 23 / 0.28);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --fast: 150ms;
  --slow: 250ms;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, 'Cascadia Mono', Menlo, Consolas, 'Liberation Mono', monospace;
  --field-size: 16px;

  /* pattern token colours */
  --tok-literal: #e2e8f0;
  --tok-escape: #5eead4;
  --tok-class: #fcd34d;
  --tok-quantifier: #f9a8d4;
  --tok-group: #c4b5fd;
  --tok-lookaround: #f0abfc;
  --tok-anchor: #93c5fd;
  --tok-backreference: #fdba74;
  --tok-alternation: #fda4af;

  /* capture group colours (RGB channels, used with an alpha) */
  --g1: 252 211 77;
  --g2: 94 234 212;
  --g3: 249 168 212;
  --g4: 125 211 252;
  --g5: 190 242 100;
  --g6: 253 186 116;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scrollbar-color: var(--border) var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg);
  background-image: radial-gradient(1100px 380px at 50% -180px, rgb(var(--accent-rgb) / 0.12), transparent 70%);
  background-repeat: no-repeat;
  color: var(--text);
  font: 15px/1.5 var(--font);
}

::selection {
  background: rgb(var(--accent-rgb) / 0.35);
}

button,
input,
textarea {
  font: inherit;
  color: inherit;
}

button {
  -webkit-tap-highlight-color: transparent;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -60px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  text-decoration: none;
  transition: top var(--fast) var(--ease);
}

.skip-link:focus {
  top: 12px;
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ---------- page frame ---------- */

.wrap {
  width: 100%;
  max-width: 960px;
  margin-inline: auto;
  padding-inline: 16px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 14px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.logo {
  width: 38px;
  height: 38px;
  flex: none;
  filter: drop-shadow(0 6px 16px rgb(var(--accent-rgb) / 0.3));
}

h1 {
  margin: 0;
  font-size: 19px;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.tagline {
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.header-actions {
  display: flex;
  flex: none;
  gap: 8px;
}

.app-footer {
  padding-block: 0 22px;
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}

.app-footer p {
  margin: 0;
}

.app-footer a {
  display: inline-block;
  padding-block: 10px;
  line-height: 20px;
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: rgb(var(--accent-rgb) / 0.4);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--fast);
}

.app-footer a:hover {
  text-decoration-color: currentColor;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-width: 40px;
  min-height: 40px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--fast), border-color var(--fast), color var(--fast), transform var(--fast);
}

.btn:hover {
  background: var(--raised);
  border-color: var(--border-strong);
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}

.btn-accent:hover {
  background: #d6ccfe;
  border-color: #d6ccfe;
}

.btn-lang {
  padding: 0 12px;
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

.btn-small {
  padding: 0 12px;
  font-size: 13px;
}

.icon-btn {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 40px;
  height: 40px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: background var(--fast), color var(--fast);
}

.icon-btn:hover {
  background: var(--raised);
  color: var(--text);
}

/* ---------- layout and cards ---------- */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  grid-template-areas: 'pattern' 'text' 'results';
  gap: 16px;
  padding-block: 4px 24px;
}

.layout.has-explain {
  grid-template-areas: 'pattern' 'explain' 'text' 'results';
}

.pattern-card {
  grid-area: pattern;
}

.explain-card {
  grid-area: explain;
}

.text-card {
  grid-area: text;
}

.results-card {
  grid-area: results;
}

.card {
  min-width: 0;
  padding: 16px;
  border: 1px solid rgb(148 163 184 / 0.12);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.card-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 12px;
  margin-bottom: 12px;
}

.card-title,
.field-label,
.flags-label {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}

.hint {
  margin: -4px 0 12px;
  font-size: 13px;
  color: var(--muted);
}

.empty {
  margin: 0;
  padding: 18px 12px;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 14px;
  color: var(--muted);
}

.more {
  margin: 10px 0 0;
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

/* ---------- pattern card ---------- */

.tools {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tool {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--fast), border-color var(--fast), color var(--fast);
}

.tool:hover {
  background: var(--raised);
}

.tool[aria-expanded='true'] {
  border-color: rgb(var(--accent-rgb) / 0.55);
  background: rgb(var(--accent-rgb) / 0.14);
  color: var(--accent);
}

.pattern-shell,
.text-shell {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--field);
  transition: border-color var(--fast), box-shadow var(--fast);
}

.pattern-shell {
  display: flex;
  align-items: flex-start;
  padding: 0 12px;
}

.pattern-shell:focus-within,
.text-shell:focus-within {
  border-color: rgb(var(--accent-rgb) / 0.7);
  box-shadow: 0 0 0 3px rgb(var(--accent-rgb) / 0.18);
}

.pattern-shell.is-invalid {
  border-color: rgb(var(--danger-rgb) / 0.8);
  box-shadow: 0 0 0 3px rgb(var(--danger-rgb) / 0.15);
}

.delim,
.flag-echo {
  padding-block: 12px;
  font: 500 var(--field-size) / 1.6 var(--mono);
  user-select: none;
}

.delim {
  color: var(--faint);
}

.flag-echo {
  color: var(--accent);
}

/* The editors: a transparent textarea over a "mirror" that paints colours and marks. */
.editor {
  position: relative;
  flex: 1;
  min-width: 0;
}

.editor .mirror,
.editor .field {
  margin: 0;
  padding: 12px 4px;
  border: 0;
  font: var(--field-size) / 1.6 var(--mono);
  font-variant-ligatures: none;
  letter-spacing: 0;
  tab-size: 4;
  white-space: pre-wrap;
  overflow-wrap: break-word;
}

.editor .mirror {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  color: var(--text);
}

.editor .field {
  position: relative;
  display: block;
  width: 100%;
  min-height: 0;
  overflow: hidden;
  resize: none;
  outline: none;
  background: transparent;
  color: var(--text);
  caret-color: var(--accent);
}

.field::placeholder,
.input::placeholder {
  color: var(--faint);
  opacity: 1;
}

.editor-pattern .mirror,
.editor-pattern .field {
  word-break: break-all;
}

.editor-pattern .field {
  color: transparent;
}

.editor-pattern .field::selection {
  color: transparent;
  background: rgb(var(--accent-rgb) / 0.35);
}

.text-shell {
  padding: 0 8px;
}

.editor-text .mirror {
  color: transparent;
}

.tok {
  border-radius: 3px;
  transition: background var(--fast), box-shadow var(--fast);
}

.tok-literal { color: var(--tok-literal); }
.tok-escape { color: var(--tok-escape); }
.tok-class { color: var(--tok-class); }
.tok-quantifier { color: var(--tok-quantifier); }
.tok-group,
.tok-groupEnd { color: var(--tok-group); }
.tok-lookaround { color: var(--tok-lookaround); }
.tok-anchor { color: var(--tok-anchor); }
.tok-backreference { color: var(--tok-backreference); }
.tok-alternation { color: var(--tok-alternation); }

.mirror .tok.is-related {
  background: rgb(var(--accent-rgb) / 0.16);
}

.mirror .tok.is-hot {
  background: rgb(var(--accent-rgb) / 0.32);
  box-shadow: 0 0 0 1px rgb(var(--accent-rgb) / 0.8);
}

.flags {
  container-type: inline-size;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-top: 12px;
}

/* One row of seven equal flags, never narrower than a 40 px tap target. */
.flag-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
  gap: 4px;
  width: 100%;
}

/* Too narrow for seven 40 px flags (7 x 40 + 6 x 2 px gap): two even rows instead. */
@container (width < 292px) {
  .flag-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.flag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field);
  color: var(--muted);
  cursor: pointer;
  transition: background var(--fast), border-color var(--fast), color var(--fast);
}

.flag:hover {
  border-color: var(--border-strong);
  color: var(--text);
}

.flag[aria-pressed='true'] {
  border-color: rgb(var(--accent-rgb) / 0.6);
  background: rgb(var(--accent-rgb) / 0.16);
  color: var(--accent);
}

.flag-key {
  font: 700 15px/1 var(--mono);
}

.flag-name {
  font-size: 13px;
}

.status {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 22px;
  margin: 14px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: 50%;
  background: var(--muted);
  transition: background var(--fast), box-shadow var(--fast);
}

.status.is-ok {
  color: var(--text);
}

.status.is-ok .status-dot {
  background: var(--ok);
  box-shadow: 0 0 0 3px rgb(134 239 172 / 0.15);
}

.status.is-none .status-dot {
  background: var(--muted);
  box-shadow: none;
}

.status.is-error,
.status.is-failed {
  color: var(--danger);
}

.status.is-error .status-dot,
.status.is-failed .status-dot {
  background: var(--danger);
}

.status.is-timeout {
  color: rgb(var(--warn-rgb));
}

.status.is-timeout .status-dot {
  background: rgb(var(--warn-rgb));
}

.status.is-pending .status-dot {
  animation: pulse 1s ease-in-out infinite;
}

.notice {
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid rgb(var(--danger-rgb) / 0.35);
  border-radius: var(--radius-sm);
  background: rgb(var(--danger-rgb) / 0.08);
}

.notice-title {
  margin: 0;
  font-weight: 700;
  color: var(--danger);
}

.notice-body {
  margin: 4px 0 0;
  font-size: 14px;
  overflow-wrap: anywhere;
}

.notice.is-timeout {
  border-color: rgb(var(--warn-rgb) / 0.4);
  background: rgb(var(--warn-rgb) / 0.08);
}

.notice.is-timeout .notice-title {
  color: rgb(var(--warn-rgb));
}

/* ---------- explanation panel ---------- */

.token-list,
.match-list,
.part-list,
.example-list,
.cheat-list,
.legend {
  margin: 0;
  padding: 0;
  list-style: none;
}

.token-list {
  display: grid;
  gap: 2px;
}

.token-row {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  width: 100%;
  min-height: 40px;
  padding: 9px 10px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: background var(--fast), box-shadow var(--fast);
}

.token-row:hover {
  background: var(--raised);
}

.token-row.is-related {
  background: rgb(var(--accent-rgb) / 0.08);
}

.token-row.is-hot {
  background: rgb(var(--accent-rgb) / 0.16);
}

.token-row[aria-pressed='true'] {
  background: rgb(var(--accent-rgb) / 0.18);
  box-shadow: inset 3px 0 0 var(--accent);
}

/* Nesting shows as indentation inside the code column, so the descriptions line up. */
.token-row .tok {
  min-width: 0;
  padding-left: calc(var(--depth, 0) * 12px);
  font: 600 14px/1.4 var(--mono);
  overflow-wrap: anywhere;
}

.token-text {
  min-width: 0;
  font-size: 14px;
  line-height: 1.45;
}

/* ---------- test text ---------- */

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 2px 10px 2px 8px;
  border-radius: 999px;
  background: var(--field);
  font: 12px/1.6 var(--mono);
  color: var(--muted);
}

.legend-item::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: rgb(var(--g) / 0.75);
}

.legend-match {
  --g: var(--accent-rgb);
}

.loaded-example {
  margin: 0 0 12px;
  padding: 10px 12px;
  border: 1px solid rgb(var(--accent-rgb) / 0.2);
  border-radius: var(--radius-sm);
  background: rgb(var(--accent-rgb) / 0.08);
  font-size: 14px;
  color: var(--muted);
}

.loaded-example strong {
  color: var(--text);
}

.g1 { --g: var(--g1); }
.g2 { --g: var(--g2); }
.g3 { --g: var(--g3); }
.g4 { --g: var(--g4); }
.g5 { --g: var(--g5); }
.g6 { --g: var(--g6); }

.hl {
  padding: 0;
  color: inherit;
}

.hl-main {
  background: rgb(var(--accent-rgb) / 0.26);
  box-shadow: inset 0 -2px 0 rgb(var(--accent-rgb) / 0.9);
}

.hl-alt {
  background: rgb(147 197 253 / 0.24);
  box-shadow: inset 0 -2px 0 rgb(147 197 253 / 0.9);
}

.hl-g1 { background: rgb(var(--g1) / 0.3); }
.hl-g2 { background: rgb(var(--g2) / 0.3); }
.hl-g3 { background: rgb(var(--g3) / 0.3); }
.hl-g4 { background: rgb(var(--g4) / 0.3); }
.hl-g5 { background: rgb(var(--g5) / 0.3); }
.hl-g6 { background: rgb(var(--g6) / 0.3); }

.hl-first {
  border-top-left-radius: 4px;
  border-bottom-left-radius: 4px;
}

.hl-last {
  border-top-right-radius: 4px;
  border-bottom-right-radius: 4px;
}

.hl-empty {
  margin: 0 -1px;
  border-left: 2px solid var(--accent);
  background: none;
  box-shadow: none;
}

.hl.is-active {
  background: rgb(var(--accent-rgb) / 0.55);
}

/* ---------- results ---------- */

.results-card .panel {
  transition: opacity var(--slow);
}

.results-card.is-pending .panel {
  opacity: 0.55;
}

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 14px;
  padding: 4px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--field);
}

.tab {
  display: inline-flex;
  flex: 1;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 8px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--fast), color var(--fast), box-shadow var(--fast);
}

.tab:hover {
  color: var(--text);
}

.tab[aria-selected='true'] {
  background: var(--raised);
  color: var(--text);
  box-shadow: 0 1px 3px rgb(2 6 23 / 0.5);
}

.badge {
  min-width: 22px;
  padding: 1px 7px;
  border-radius: 999px;
  background: rgb(var(--accent-rgb) / 0.18);
  color: var(--accent);
  font: 600 12px/1.5 var(--mono);
}

.match-list {
  display: grid;
  gap: 8px;
}

.match {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: background var(--fast), border-color var(--fast);
}

.match:hover,
.match.is-active {
  border-color: rgb(var(--accent-rgb) / 0.6);
}

.match[aria-pressed='true'] {
  border-color: var(--accent);
  background: rgb(var(--accent-rgb) / 0.1);
}

.match-top {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.match-no {
  display: inline-grid;
  place-items: center;
  flex: none;
  min-width: 24px;
  height: 24px;
  padding: 0 4px;
  border-radius: 7px;
  background: rgb(var(--accent-rgb) / 0.16);
  color: var(--accent);
  font: 600 12px/1 var(--mono);
}

.match-value {
  flex: 1;
  min-width: 0;
  font: 600 15px/1.4 var(--mono);
  overflow-wrap: anywhere;
}

.match-range {
  flex: none;
  font-size: 12px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.match-groups {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-left: 34px;
}

.group-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 3px 10px 3px 4px;
  border: 1px solid rgb(var(--g) / 0.3);
  border-radius: 999px;
  background: rgb(var(--g) / 0.1);
  font-size: 12px;
}

.group-no {
  display: inline-grid;
  place-items: center;
  flex: none;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 999px;
  background: rgb(var(--g));
  color: var(--bg);
  font: 700 11px/1 var(--mono);
}

.group-name {
  color: var(--muted);
}

.group-value {
  min-width: 0;
  font: 600 13px/1.4 var(--mono);
  color: rgb(var(--g));
  overflow-wrap: anywhere;
}

.group-range {
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.group-chip.is-unset {
  opacity: 0.65;
}

.group-chip.is-unset .group-value {
  font: italic 12px/1.4 var(--font);
  color: var(--muted);
}

.is-empty {
  font-family: var(--font);
  font-style: italic;
  font-weight: 400;
  color: var(--muted);
}

.special {
  color: var(--faint);
}

.input {
  display: block;
  width: 100%;
  min-height: 44px;
  margin-top: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field);
  font: var(--field-size) / 1.4 var(--mono);
  caret-color: var(--accent);
  outline: none;
  transition: border-color var(--fast), box-shadow var(--fast);
}

.input:focus {
  border-color: rgb(var(--accent-rgb) / 0.7);
  box-shadow: 0 0 0 3px rgb(var(--accent-rgb) / 0.18);
}

.chips-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 10px;
}

.chips-label {
  font-size: 13px;
  color: var(--muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chip {
  min-height: 40px;
  padding: 0 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--field);
  color: var(--accent);
  font: 600 13px/1 var(--mono);
  cursor: pointer;
  transition: background var(--fast), border-color var(--fast);
}

.chip:hover {
  border-color: rgb(var(--accent-rgb) / 0.6);
  background: rgb(var(--accent-rgb) / 0.1);
}

.output-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin: 16px 0 8px;
}

#panel-split .output-head {
  margin-top: 0;
}

.count {
  font-size: 13px;
  color: var(--muted);
}

.output-head .btn-small {
  margin-left: auto;
}

.output {
  min-height: 48px;
  margin: 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field);
  font: 15px/1.6 var(--mono);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.rep {
  border-radius: 4px;
  background: rgb(var(--accent-rgb) / 0.22);
  box-shadow: inset 0 -2px 0 rgb(var(--accent-rgb) / 0.7);
  color: var(--accent);
}

.rep.is-empty {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  margin: 0 1px;
  vertical-align: text-bottom;
  background: var(--accent);
}

.part-list {
  display: grid;
  gap: 6px;
}

.part {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field);
}

.part.is-capture {
  border-color: rgb(var(--accent-rgb) / 0.35);
}

.part-no {
  flex: none;
  min-width: 24px;
  font: 600 12px/1 var(--mono);
  color: var(--muted);
  text-align: right;
}

.part-value {
  flex: 1;
  min-width: 0;
  font: 15px/1.4 var(--mono);
  overflow-wrap: anywhere;
}

.part-undefined {
  font: inherit;
  color: var(--muted);
}

.part-note {
  font: italic 13px/1.4 var(--font);
  color: var(--muted);
}

.part-tag {
  flex: none;
  padding: 2px 8px;
  border-radius: 999px;
  background: rgb(var(--accent-rgb) / 0.14);
  color: var(--accent);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* ---------- dialogs: cheat sheet drawer and example library ---------- */

dialog {
  padding: 0;
  border: 1px solid rgb(148 163 184 / 0.16);
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 24px 64px rgb(2 6 23 / 0.6);
  overscroll-behavior: contain;
}

dialog::backdrop {
  background: rgb(2 6 23 / 0.62);
}

.dialog-body {
  padding: 0 20px 20px;
}

.dialog-head {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 0 12px;
  background: var(--surface);
}

.dialog-head h2 {
  margin: 0;
  font-size: 18px;
}

.drawer {
  width: min(440px, 100%);
  max-width: 100%;
  height: 100%;
  max-height: 100%;
  margin: 0 0 0 auto;
  border-right: 0;
  border-radius: 16px 0 0 16px;
}

.drawer .dialog-body {
  min-height: 100%;
}

.sheet {
  width: min(600px, calc(100% - 32px));
  max-width: 100%;
  max-height: min(720px, calc(100% - 48px));
  border-radius: 16px;
}

.cheat-sections {
  display: grid;
  gap: 18px;
}

.cheat-section h3 {
  margin: 0 0 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}

.cheat-list {
  display: grid;
  gap: 4px;
}

.cheat-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  min-height: 40px;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: var(--field);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--fast), background var(--fast);
}

.cheat-item:hover {
  border-color: rgb(var(--accent-rgb) / 0.5);
  background: var(--raised);
}

.cheat-item code {
  flex: none;
  min-width: 76px;
  font: 600 14px/1.4 var(--mono);
  color: var(--accent);
}

.cheat-item span {
  font-size: 14px;
  line-height: 1.4;
}

.example-list {
  display: grid;
  gap: 8px;
}

.example-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--field);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  transition: border-color var(--fast), background var(--fast);
}

.example-item:hover {
  border-color: rgb(var(--accent-rgb) / 0.6);
}

.example-item[aria-current='true'] {
  border-color: var(--accent);
  background: rgb(var(--accent-rgb) / 0.08);
}

.example-name {
  font-weight: 700;
}

.example-pattern {
  max-width: 100%;
  font: 13px/1.4 var(--mono);
  color: var(--accent);
  overflow-wrap: anywhere;
}

.example-note {
  font-size: 13px;
  color: var(--muted);
}

/* ---------- toast ---------- */

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  z-index: 50;
  max-width: calc(100% - 32px);
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: #f1f5f9;
  color: var(--bg);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: opacity var(--slow) var(--ease), transform var(--slow) var(--ease);
}

.toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* ---------- motion ---------- */

@keyframes pulse {
  50% {
    opacity: 0.3;
  }
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateX(32px);
  }
}

@keyframes pop-in {
  from {
    opacity: 0;
    transform: translateY(8px) scale(0.98);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
}

.drawer[open] {
  animation: slide-in var(--slow) var(--ease);
}

.sheet[open] {
  animation: pop-in var(--slow) var(--ease);
}

dialog[open]::backdrop {
  animation: fade-in var(--slow) ease;
}

/* ---------- small screens ---------- */

@media (max-width: 559px) {
  .tagline {
    display: none;
  }

  .header-actions .btn {
    width: 40px;
    padding: 0;
  }

  .header-actions .btn-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .card {
    padding: 14px;
  }

  .tools {
    width: 100%;
  }

  .tool {
    flex: 1 1 auto;
    padding: 0 8px;
  }

  .token-row {
    grid-template-columns: 88px minmax(0, 1fr);
  }

  .match-groups {
    padding-left: 0;
  }

  .group-range {
    display: none;
  }

  .drawer,
  .sheet {
    width: 100%;
    height: auto;
    max-height: 88%;
    margin: auto 0 0;
    border-right: 1px solid rgb(148 163 184 / 0.16);
    border-bottom: 0;
    border-radius: 18px 18px 0 0;
  }

  .drawer .dialog-body {
    min-height: 0;
  }

  .drawer[open],
  .sheet[open] {
    animation-name: rise-in;
  }
}

@media (max-width: 399px) {
  .tool .icon {
    display: none;
  }

  .flag-list {
    gap: 2px;
  }
}

@media (max-width: 719px) {
  .flag-name {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }
}

/* ---------- wider screens ---------- */

@media (min-width: 720px) {
  :root {
    --field-size: 15px;
  }

  .wrap {
    padding-inline: 24px;
  }

  .card {
    padding: 20px;
  }

  .flag-list {
    display: flex;
    flex-wrap: wrap;
    width: auto;
    gap: 6px;
  }

  .flag {
    padding: 0 12px;
  }
}

@media (min-width: 1000px) {
  body:has(.layout.has-explain) .wrap {
    max-width: 1280px;
  }

  .layout.has-explain {
    grid-template-columns: minmax(0, 1fr) 380px;
    grid-template-rows: auto auto 1fr;
    grid-template-areas:
      'pattern explain'
      'text explain'
      'results explain';
    align-items: start;
  }

  .layout.has-explain .explain-card {
    position: sticky;
    top: 16px;
    max-height: calc(100vh - 32px);
    overflow: auto;
    scrollbar-width: thin;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}