:root {
  color-scheme: light dark;
  --bg: #f6f3ec;
  --card: #ffffff;
  --ink: #26241f;
  --muted: #6c665a;
  --accent: #8a5a2b;
  --accent-ink: #ffffff;
  --correct: #2e7d32;
  --wrong: #b3261e;
  --present: #b8860b;
  --border: #e4ddcc;
  --key-bg: #e4ddcc;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1b1a17;
    --card: #262420;
    --ink: #ece6d9;
    --muted: #a89f8c;
    --accent: #d9a05b;
    --accent-ink: #1b1a17;
    --correct: #7ed08a;
    --wrong: #ff8a80;
    --present: #e0b84a;
    --border: #3a362e;
    --key-bg: #3a362e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Georgia, 'Iowan Old Style', serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 640px;
  padding: 2rem 1.25rem 3rem;
}

header {
  text-align: center;
  margin-bottom: 1.5rem;
}

h1 {
  font-size: 1.6rem;
  margin: 0 0 0.5rem;
}

.scoreboard {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--muted);
  font-size: 0.95rem;
}

.mode-heading {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 0.5rem;
}

.hidden { display: none !important; }

.screen {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 2rem 1.5rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

#lang-prompt {
  text-align: center;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--muted);
  margin-top: 0;
}

.lang-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 1.5rem;
}

.lang-btn, .next-btn, .option-btn {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  cursor: pointer;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  padding: 0.85rem 1.25rem;
  font-size: 1rem;
  transition: transform 0.08s ease, background 0.15s ease, border-color 0.15s ease;
}

.lang-btn { flex: 1; max-width: 220px; }

.lang-btn:hover, .option-btn:hover:not(:disabled) {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.loading {
  text-align: center;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  padding: 2rem 0;
}

#passage-text {
  font-size: 1.25rem;
  line-height: 1.6;
  margin: 0 0 0.5rem;
  padding: 0;
  border: none;
  font-style: italic;
}

.hint {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 1.5rem;
}

.options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

@media (max-width: 480px) {
  .options { grid-template-columns: 1fr; }
}

.option-btn {
  text-align: left;
}

.option-btn.correct {
  background: color-mix(in srgb, var(--correct) 18%, var(--card));
  border-color: var(--correct);
}

.option-btn.wrong {
  background: color-mix(in srgb, var(--wrong) 18%, var(--card));
  border-color: var(--wrong);
}

.option-btn:disabled {
  cursor: default;
  opacity: 0.85;
}

.feedback {
  margin-top: 1.25rem;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 600;
  text-align: center;
}

.feedback.correct { color: var(--correct); }
.feedback.wrong { color: var(--wrong); }

.next-btn {
  display: block;
  margin: 1.5rem auto 0;
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
  font-weight: 600;
}

.app-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 2rem;
}

.app-footer a {
  color: var(--accent);
  text-decoration: none;
}

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

.lang-switcher {
  display: flex;
  gap: 0.2rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.2rem;
  margin-left: auto;
}

.lang-switch-btn {
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 50%;
  background: transparent;
  width: 1.5rem;
  height: 1.5rem;
  font-size: 0.75rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.5;
  transition: opacity 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}

.lang-switch-btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.lang-switch-btn.active {
  opacity: 1;
  border-color: var(--accent);
}

/* Mode select screen */

#mode-prompt {
  text-align: center;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--muted);
  margin-top: 0;
}

.mode-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.5rem;
}

.mode-btn {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  cursor: pointer;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  padding: 1rem 1.25rem;
  text-align: left;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 0.75rem;
  transition: transform 0.08s ease, border-color 0.15s ease;
}

.mode-btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.mode-emoji {
  grid-row: span 2;
  font-size: 1.8rem;
  align-self: center;
}

.mode-name {
  font-weight: 700;
  font-size: 1.05rem;
}

.mode-desc {
  color: var(--muted);
  font-size: 0.88rem;
}

/* Diverse mode */

.category-badge {
  display: inline-block;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 14%, var(--card));
  border-radius: 999px;
  padding: 0.3rem 0.8rem;
  margin-bottom: 0.75rem;
}

.diverse-reference {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 0.75rem;
}

.diverse-text {
  font-size: 1.15rem;
  line-height: 1.6;
  margin: 0 0 1.5rem;
  padding: 0;
  border: none;
  font-style: italic;
  letter-spacing: 0.02em;
}

.tile-grid {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.tile-row {
  display: flex;
  gap: 0.4rem;
}

.tile {
  width: 2.6rem;
  height: 2.6rem;
  border: 2px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  text-transform: uppercase;
  color: var(--ink);
}

.tile.correct {
  background: var(--correct);
  border-color: var(--correct);
  color: #fff;
}

.tile.present {
  background: var(--present);
  border-color: var(--present);
  color: #fff;
}

.tile.absent {
  background: var(--key-bg);
  border-color: var(--key-bg);
  color: var(--muted);
}

.keyboard {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  align-items: center;
}

.keyboard-row {
  display: flex;
  gap: 0.3rem;
}

.key-btn {
  font-family: -apple-system, BlinkMacSystemFont, sans-serif;
  cursor: pointer;
  border: none;
  border-radius: 6px;
  background: var(--key-bg);
  color: var(--ink);
  padding: 0.65rem 0.5rem;
  min-width: 2rem;
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  transition: background 0.15s ease;
}

.key-btn.wide {
  min-width: 3.2rem;
  font-size: 0.7rem;
}

.key-btn.correct {
  background: var(--correct);
  color: #fff;
}

.key-btn.present {
  background: var(--present);
  color: #fff;
}

.key-btn.absent {
  background: var(--border);
  color: var(--muted);
  opacity: 0.6;
}