:root {
  --bg: #f6f4ef;
  --card: #ffffff;
  --text: #2b2b2b;
  --muted: #77716a;
  --border: #e4e0d8;
  --primary: #c0392b;
  --primary-text: #ffffff;
  --gold: #e9b44c;
  --low: #2e8b57;
  --medium: #d9962e;
  --high: #c0392b;
  --correct-bg: #e2f3e6;
  --wrong-bg: #fbe3e0;
  --shadow: 0 2px 10px rgba(0,0,0,.07);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1b18;
    --card: #2a2723;
    --text: #ece8e1;
    --muted: #a49c90;
    --border: #3d382f;
    --correct-bg: #24402b;
    --wrong-bg: #462622;
    --shadow: 0 2px 10px rgba(0,0,0,.35);
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
main { max-width: 720px; margin: 0 auto; padding: 16px; }

/* Header */
.app-header {
  background: var(--primary);
  color: var(--primary-text);
  padding: 14px 16px 0;
  text-align: center;
}
.app-header h1 { margin: 0 0 10px; font-size: 1.6rem; letter-spacing: .5px; }
.tabs { display: flex; justify-content: center; gap: 8px; }
.tab {
  background: rgba(255,255,255,.15);
  color: var(--primary-text);
  border: none;
  padding: 10px 22px;
  font-size: 1rem;
  border-radius: 10px 10px 0 0;
  cursor: pointer;
}
.tab.active { background: var(--bg); color: var(--text); font-weight: 600; }

/* Cards */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 18px;
  margin-bottom: 18px;
}
.card h2 { margin: 0 0 6px; font-size: 1.15rem; }
.card.center { text-align: center; }
.hint { color: var(--muted); font-size: .9rem; margin: 4px 0 12px; }

/* Forms */
textarea, input[type="search"], input[type="text"], select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
}
input[type="search"] { max-width: 220px; }
select { width: auto; }

.row { display: flex; align-items: center; gap: 10px; margin-top: 10px; flex-wrap: wrap; }
.row.space-between { justify-content: space-between; }
.row.center-row { justify-content: center; }
.backup-row { border-top: 1px dashed var(--border); padding-top: 12px; margin-top: 16px; }

/* Buttons */
.btn {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform .05s, filter .15s;
}
.btn:hover { filter: brightness(.96); }
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--primary); color: var(--primary-text); border-color: var(--primary); }
.btn.big { font-size: 1.15rem; padding: 14px 30px; margin-top: 10px; }
.btn.subtle { font-size: .85rem; padding: 7px 12px; color: var(--muted); }
.btn:disabled { opacity: .5; cursor: wait; }

.status { color: var(--muted); font-size: .9rem; }

/* Stats bar */
.stats-bar {
  display: flex; gap: 10px; flex-wrap: wrap;
  margin-bottom: 14px; font-size: .9rem;
}
.stat-chip {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 4px 14px;
}
.stat-chip b { font-weight: 700; }

/* Level badges */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: .75rem;
  font-weight: 600;
  color: #fff;
  text-transform: uppercase;
}
.badge.low { background: var(--low); }
.badge.medium { background: var(--medium); }
.badge.high { background: var(--high); }

/* Review rows (new words pending save) */
.review-row {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  border: 1px dashed var(--gold);
  border-radius: 10px;
  padding: 10px;
  margin-top: 12px;
  background: color-mix(in srgb, var(--gold) 8%, var(--card));
}
.review-row .es { font-weight: 700; font-size: 1.05rem; min-width: 90px; }
.review-row input.en-input { flex: 1; min-width: 140px; width: auto; }

/* Word list */
.word-row {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 4px;
  border-bottom: 1px solid var(--border);
}
.word-row:last-child { border-bottom: none; }
.word-row .words { flex: 1; min-width: 0; }
.word-row .es { font-weight: 700; }
.word-row .en { color: var(--muted); }
.word-row .acc { font-size: .8rem; color: var(--muted); white-space: nowrap; }
.word-row .actions { display: flex; gap: 6px; }
.word-row .actions button {
  border: none; background: none; cursor: pointer; font-size: 1rem; padding: 4px;
}
.empty-msg { color: var(--muted); text-align: center; padding: 24px 0; }

/* Voice input */
#mic-btn.listening {
  background: var(--wrong-bg);
  border-color: var(--high);
  animation: pulse 1.2s infinite;
}
@keyframes pulse {
  50% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--high) 25%, transparent); }
}

/* Quiz */
.progress { color: var(--muted); font-size: .9rem; margin-bottom: 8px; }
.quiz-word-row {
  display: flex; align-items: center; justify-content: center; gap: 12px;
}
.btn.speak {
  font-size: 1.3rem;
  padding: 8px 12px;
  border-radius: 50%;
  line-height: 1;
}
.quiz-word {
  font-size: 2.4rem;
  font-weight: 800;
  margin: 14px 0 18px;
  letter-spacing: .5px;
}
.rate-buttons, .choice-buttons {
  display: flex; flex-direction: column; gap: 10px;
  max-width: 380px; margin: 0 auto;
}
@media (min-width: 560px) {
  .rate-buttons { flex-direction: row; justify-content: center; max-width: none; }
}
.btn.rate {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  padding: 12px 20px; font-weight: 700; color: #fff; border: none;
}
.btn.rate small { font-weight: 400; font-size: .75rem; opacity: .85; }
.btn.rate.low { background: var(--low); }
.btn.rate.medium { background: var(--medium); }
.btn.rate.high { background: var(--high); }

.btn.choice { font-size: 1.05rem; padding: 14px; }
.btn.choice.correct { background: var(--correct-bg); border-color: var(--low); font-weight: 700; }
.btn.choice.wrong { background: var(--wrong-bg); border-color: var(--high); }

#quiz-feedback { margin-top: 16px; }
#feedback-msg { font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
#feedback-msg.ok { color: var(--low); }
#feedback-msg.bad { color: var(--high); }

/* Summary */
.score { font-size: 2rem; font-weight: 800; margin: 10px 0; }
#summary-missed .word-row { text-align: left; }
#summary-levels { margin: 14px 0; }