:root {
  /* Typography */
  --mono: Monaco, "Lucida Console", monospace;
  --font-pill: 12px;

  /* Geometry */
  --pad-pill: 3px 8px;
  --radius: 4px;

  /* Semantic colors */
  --color-text: #808080;
  /* default pill text (unmatched letters) */
  --color-match: #2563eb;
  /* matched/highlighted text */
  --color-chrome: #bbb;
  /* structural chrome (arrows, brackets) */

  /* Backgrounds */
  --bg: #fafafa;
  --bg-t1: #dffde3;
  /* tier-1: common words */
  --bg-t2: #fafafa;
  /* tier-2: mid-frequency words */
  --bg-t3: #ffefef;
  /* tier-3: rare words */

  /* Borders */
  --border: #e0e0e0;
  /* chips */
  --border-ui: #ccc;
  /* UI controls (toggles) */
  --border-card: #e5e5e5;
  /* cards, section dividers */

  /* Text */
  --text-muted: #888;
  /* secondary text, status */
  --text-faint: #aaa;
  /* labels, inactive controls */
  --text-strong: #555;
  /* counts, hover emphasis */

  /* Controls */
  --toggle-on: #333;
  /* active mode toggle */
  --divider: #ddd;
  /* vertical divider between controls */
}

#app {
  max-width: 640px;
  margin: 0 auto;
  padding: 30px 20px 60px;
}

#header {
  margin-bottom: 20px;
}

#header p {
  margin-top: 4px;
  font-size: 13px;
  color: var(--text-muted);
}

#search-form {
  margin-bottom: 16px;
}

#search-row {
  margin-bottom: 10px;
}

#search-row input[type="text"] {
  width: 100%;
  box-sizing: border-box;
}

#search-options {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

#mode-toggles {
  display: contents;
}

.mode-toggle {
  display: inline-flex;
  cursor: pointer;
  user-select: none;
}

.mode-toggle input[type="checkbox"] {
  display: none;
}

.mode-toggle span {
  padding: 3px 10px;
  border: 1px solid var(--border-ui);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  transition: background 0.1s, color 0.1s, border-color 0.1s;
}

.mode-toggle input:checked+span {
  background: var(--toggle-on);
  border-color: var(--toggle-on);
  color: #fff;
}

.mode-toggle:hover span {
  border-color: var(--text-muted);
}

.modes-divider {
  width: 1px;
  height: 16px;
  background: var(--divider);
  align-self: center;
  flex-shrink: 0;
}

#status {
  font-size: 13px;
  color: var(--text-muted);
  min-height: 18px;
  margin-bottom: 8px;
}

#results {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.result-section:empty {
  display: none;
}

.section-header {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  margin-bottom: 10px;
}

.section-header .count {
  color: var(--text-strong);
}

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

.anagram-break {
  flex-basis: 100%;
  height: 0;
}

/* === Pill system ===
   .chip — single bordered box; words inside are plain spans separated by gap
   .hit  — matched text: blue + bold
   .dim  — structural chrome (→, …, ·, brackets): muted
*/

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--mono);
  font-size: var(--font-pill);
  letter-spacing: 0.05em;
  padding: var(--pad-pill);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-t2);
  color: var(--color-text);
  user-select: text;
}

.tier-1 {
  background: var(--bg-t1);
}

.tier-2 {
  background: var(--bg-t2);
}

.tier-3 {
  background: var(--bg-t3);
}

.hit {
  color: var(--color-match);
  font-weight: 900;
}

.dim {
  color: var(--color-chrome);
}

/* === Results controls === */

.more-note {
  margin-top: 10px;
  font-size: 12px;
  color: var(--color-chrome);
}

.expand-toggle {
  display: block;
  margin-top: 8px;
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  color: var(--text-faint);
  cursor: pointer;
}

.expand-toggle:hover {
  color: var(--text-strong);
}

/* === Hidden mode layout === */

.grid-hidden {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hidden-group {
  border: 1px solid var(--border-card);
  border-radius: 6px;
  padding: 8px 12px;
  background: var(--bg);
}

.hidden-split {
  font-family: var(--mono);
  font-size: var(--font-pill);
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.hidden-pair {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.hidden-words {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  flex: 1;
}

.hidden-arrow {
  color: var(--color-chrome);
  font-size: 14px;
  flex-shrink: 0;
  padding-top: 1px;
}

.hidden-mid-label .chip {
  border: none;
}

.hidden-mid-label {
  font-family: var(--mono);
  font-size: var(--font-pill);
  flex-shrink: 0;
  align-self: center;
  letter-spacing: 0.05em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.hidden-examples {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-top: 8px;
  padding-top: 7px;
  border-top: 1px solid var(--border-card);
}

@media (max-width: 480px) {
  #app {
    padding: 20px 14px 40px;
  }
}

.header-links {
  margin-top: 6px;
  font-size: 12px;
  color: var(--text-faint);
}