:root {
  --ink: #292524;
  --bg: #363231;
  --ink-elevated: #464242;
  --ink-hover: #3e3b3a;
  --paper: #f7f4ef;
  --text-muted: #b8b0a8;
  --accent: #d48492;
  --accent-dark: #b86a78;
  --accent-light: rgba(212, 132, 146, 0.2);
  --warn: #d4a574;
  --warn-bg: rgba(212, 165, 116, 0.15);
  --good: #8ec4a8;
  --good-bg: rgba(142, 196, 168, 0.12);
  --border: #565352;
  --radius: 6px;
  --font-heading: "Roboto Mono", monospace;
  --font-title: "Google Sans", var(--font-body);
  --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  color-scheme: dark;
}

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

html { font-size: 18px; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--paper);
  background: var(--bg);
  line-height: 1.6;
}

h1, h2, h3 {
  font-family: var(--font-heading);
}

.wrap {
  max-width: 42rem;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Header */
.site-header {
  background: var(--ink);
  color: var(--paper);
  padding: 2.5rem 0 2rem;
}

.site-header a { color: #e3b9c0; }

.eyebrow,
.term-source,
.term-flag,
.search-label,
.filter-btn,
.practice-label,
.practice-score {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.eyebrow {
  opacity: 0.7;
  margin: 0 0 0.5rem;
}

.site-header h1 {
  font-family: var(--font-title);
  font-size: 2rem;
  font-weight: 700;
  margin: 0 0 1rem;
  line-height: 1.2;
}

.site-header h1 .title-vocab {
  font-family: "Silkscreen", monospace;
  font-weight: 400;
  font-size: 1.1em;
  letter-spacing: -0.02em;
  vertical-align: baseline;
}

.lede {
  font-size: 1.05rem;
  opacity: 0.92;
  margin: 0 0 1rem;
}

.attribution {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  opacity: 0.65;
  margin: 0;
}

/* Tabs */
.tab-nav {
  display: flex;
  gap: 0.25rem;
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.tab {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius) var(--radius) 0 0;
  transition: color 0.15s, background 0.15s;
}

.tab:hover { color: var(--paper); background: var(--ink-hover); }

.tab.active {
  color: var(--accent);
  background: var(--ink-hover);
  box-shadow: inset 0 -2px 0 var(--accent);
}

/* Panels */
main { padding: 1.5rem 0 3rem; }

.panel { display: none; }
.panel.active { display: block; }

.panel-intro {
  color: var(--text-muted);
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
}

.panel-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.search-label { font-weight: 600; }

#glossary-search,
#practice-answer {
  flex: 1;
  min-width: 12rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  color: var(--paper);
  background: var(--ink-elevated);
}

#glossary-search::placeholder,
#practice-answer::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

.filter-group { display: flex; flex-wrap: wrap; gap: 0.35rem; }

.filter-btn {
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--ink-elevated);
  cursor: pointer;
  color: var(--text-muted);
}

.filter-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Glossary cards */
.glossary-list { display: flex; flex-direction: column; gap: 1rem; }

.term-card {
  background: var(--ink-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.1rem 1.25rem;
}

.term-card.caution {
  border-left: 3px solid var(--warn);
}

.term-card-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 0.75rem;
}

.term-misleading {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: line-through;
  text-decoration-color: rgba(212, 132, 146, 0.45);
}

.term-card.caution .term-misleading {
  text-decoration: none;
}

.term-arrow { color: var(--text-muted); font-size: 0.9rem; }

.term-replacement {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--good);
}

.term-flag {
  font-weight: 700;
  color: var(--warn);
  background: var(--warn-bg);
  border: 1px solid var(--warn);
  border-radius: 999px;
  padding: 0.15rem 0.6rem;
  align-self: center;
}

.term-source {
  color: var(--text-muted);
  margin-left: auto;
}

.term-body p {
  margin: 0 0 0.6rem;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.term-body p:last-child { margin-bottom: 0; }

.term-examples {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.example-bad { color: var(--accent); }
.example-good { color: var(--good); }

.example-bad::before { content: "Avoid: "; font-weight: 600; }
.example-good::before { content: "Prefer: "; font-weight: 600; }

/* Buttons */
.btn {
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--ink-elevated);
  cursor: pointer;
  color: var(--paper);
}

.btn:hover { background: var(--ink-hover); }

.btn:disabled { opacity: 0.55; cursor: default; }

.btn.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.btn.primary:hover { background: var(--accent-dark); }

/* Practice */
.practice-card {
  background: var(--ink-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.practice-label {
  color: var(--text-muted);
  margin: 0 0 0.25rem;
}

.practice-term {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 1.25rem;
}

.practice-input-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

#practice-answer {
  padding: 0.5rem 0.75rem;
}

.practice-feedback {
  min-height: 1.5rem;
  font-size: 0.92rem;
  margin-bottom: 0.75rem;
}

.practice-feedback.correct { color: var(--good); font-weight: 600; }
.practice-feedback.incorrect { color: var(--accent); }

.practice-hint {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.practice-hint summary { cursor: pointer; font-weight: 600; }

.practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.practice-score {
  color: var(--text-muted);
  margin: 0;
}

/* Rewrite */
.rewrite-list { margin-bottom: 1rem; }

.rewrite-card {
  background: var(--ink-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.rewrite-sentence {
  font-size: 1.1rem;
  line-height: 1.7;
  margin: 0 0 1rem;
}

.rewrite-flag {
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.05em 0.25em;
  border-radius: 3px;
  font-weight: 600;
}

.reveal-rewrite { margin-top: 0.25rem; }

.rewrite-after {
  margin: 1rem 0 0;
  padding: 0.85rem 1rem;
  background: var(--good-bg);
  border-left: 3px solid var(--good);
  border-radius: var(--radius);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--paper);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0 2.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 2rem;
}

@media (max-width: 480px) {
  html { font-size: 16px; }
  .practice-term { font-size: 1.6rem; }
  .practice-input-row { flex-direction: column; }
}