:root {
  --blue-900: #0d3b66;
  --blue-700: #1565c0;
  --blue-500: #2196f3;
  --blue-100: #e3f2fd;
  --blue-050: #f4f9ff;
  --white: #ffffff;
  --ink: #10243c;
  --ink-soft: #4a6178;
  --border: #cfe3f7;
  --green: #2e7d32;
  --red: #c62828;
  --radius: 16px;
  --shadow: 0 4px 14px rgba(13, 59, 102, 0.12);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, var(--blue-050) 0%, var(--white) 260px);
  color: var(--ink);
  min-height: 100vh;
  padding-bottom: 68px;
}

.app-header {
  background: linear-gradient(135deg, var(--blue-900), var(--blue-700));
  color: var(--white);
  padding: 22px 18px 26px;
  text-align: center;
  box-shadow: var(--shadow);
  position: relative;
}

.app-header h1 {
  margin: 0;
  font-size: 1.4rem;
  line-height: 1.3;
}

.app-header .flag {
  font-size: 1.6rem;
}

.app-header .subtitle {
  margin-top: 6px;
  font-size: 0.85rem;
  opacity: 0.9;
}

.back-btn {
  position: absolute;
  left: 12px;
  top: 18px;
  background: rgba(255, 255, 255, 0.18);
  border: none;
  color: var(--white);
  border-radius: 999px;
  width: 38px;
  height: 38px;
  font-size: 1.1rem;
  cursor: pointer;
}

.back-btn:active {
  background: rgba(255, 255, 255, 0.32);
}

.voice-picker {
  position: fixed;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 5px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

.voice-btn {
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: none;
  background: transparent;
  font-size: 1.15rem;
  line-height: 1;
  cursor: pointer;
  color: var(--ink);
}

.voice-btn.active {
  background: var(--blue-500);
  box-shadow: inset 0 0 0 2px var(--blue-700);
}

.voice-btn:active {
  background: var(--blue-100);
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: 18px 14px 8px;
}

/* Home menu */
.menu-grid {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 8px;
}

.offline-status {
  text-align: center;
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin-top: 18px;
  min-height: 1.2em;
}

.menu-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
  font: inherit;
}

.menu-card:active {
  background: var(--blue-100);
}

.menu-card .icon {
  font-size: 2.1rem;
  flex-shrink: 0;
}

.menu-card .label {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--blue-900);
}

.menu-card .desc {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 2px;
}

/* List mode */
.search-box {
  width: 100%;
  padding: 12px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-size: 1rem;
  margin-bottom: 14px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.search-box:focus {
  outline: 2px solid var(--blue-500);
}

.level-group-title {
  color: var(--blue-700);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 18px 4px 8px;
}

.phrase-row {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  margin-bottom: 10px;
  box-shadow: var(--shadow);
}

.phrase-row .emoji {
  font-size: 1.6rem;
  flex-shrink: 0;
  width: 44px;
  text-align: center;
}

.phrase-row .text-block {
  flex: 1;
  min-width: 0;
}

.phrase-row .pl {
  font-weight: 600;
  font-size: 0.98rem;
}

.phrase-row .wym {
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-style: italic;
  margin-top: 2px;
}

.phrase-row .gr {
  color: var(--ink-soft);
  font-size: 0.68rem;
  opacity: 0.7;
  margin-top: 2px;
}

.play-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.play-btn {
  flex-shrink: 0;
  background: var(--blue-500);
  color: var(--white);
  border: none;
  border-radius: 999px;
  width: 38px;
  height: 38px;
  font-size: 1rem;
  cursor: pointer;
  padding: 0;
}

.play-btn:active {
  background: var(--blue-700);
}

.option-play {
  flex-shrink: 0;
  background: var(--blue-500);
  color: var(--white);
  border: none;
  border-radius: 999px;
  width: 36px;
  height: 36px;
  font-size: 1rem;
  cursor: pointer;
  padding: 0;
}

.option-play:active {
  background: var(--blue-700);
}

.option-row {
  display: flex;
  align-items: stretch;
  gap: 8px;
}

.option-row .option-text-btn {
  flex: 1;
}

.prompt-play-btn {
  margin-top: 14px;
  background: var(--blue-100);
  border: 1px solid var(--border);
  color: var(--blue-700);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.9rem;
  cursor: pointer;
}

.level-badge {
  flex-shrink: 0;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--blue-700);
  background: var(--blue-100);
  border-radius: 999px;
  padding: 3px 8px;
}

.empty-state {
  text-align: center;
  color: var(--ink-soft);
  padding: 40px 10px;
}

/* Quiz mode */
.quiz-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.quiz-progress .score {
  font-weight: 700;
  color: var(--blue-700);
}

.quiz-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 26px 18px;
  text-align: center;
  margin-bottom: 18px;
}

.quiz-card .emoji-big {
  font-size: 2.6rem;
  margin-bottom: 10px;
}

.quiz-card .prompt-text {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--blue-900);
}

.quiz-card .prompt-sub {
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin-top: 6px;
}

.quiz-card .prompt-gr {
  color: var(--ink-soft);
  font-size: 0.72rem;
  opacity: 0.7;
  margin-top: 6px;
}

.replay-btn {
  margin-top: 14px;
  background: var(--blue-100);
  border: 1px solid var(--border);
  color: var(--blue-700);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.9rem;
  cursor: pointer;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  background: var(--white);
  border: 2px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}

.option-btn:active {
  background: var(--blue-100);
}

.option-btn.correct {
  border-color: var(--green);
  background: #e8f5e9;
  color: var(--green);
  font-weight: 700;
}

.option-btn.incorrect {
  border-color: var(--red);
  background: #ffebee;
  color: var(--red);
  font-weight: 700;
}

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

.next-btn {
  width: 100%;
  margin-top: 16px;
  background: var(--blue-700);
  color: var(--white);
  border: none;
  border-radius: 14px;
  padding: 14px;
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
}

.next-btn:active {
  background: var(--blue-900);
}

.result-card {
  text-align: center;
  padding: 30px 18px;
}

.result-card .big-score {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--blue-700);
  margin: 10px 0;
}

.restart-btn {
  background: var(--blue-500);
  color: var(--white);
  border: none;
  border-radius: 999px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  margin-top: 10px;
}

/* Flashcards mode */
.flashcard-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 10px;
}

.flashcard {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 20px;
  text-align: center;
  margin-bottom: 16px;
  touch-action: pan-y;
  user-select: none;
}

.flashcard-emoji {
  font-size: 3.2rem;
  margin-bottom: 14px;
}

.flashcard-pl {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--blue-900);
}

.flashcard-wym {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-style: italic;
  margin-top: 8px;
}

.flashcard-gr {
  color: var(--ink-soft);
  font-size: 0.7rem;
  opacity: 0.7;
  margin-top: 4px;
}

.flashcard-audio-buttons {
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-top: 22px;
}

.flashcard-audio-btn {
  width: 76px;
  height: 76px;
  border-radius: 999px;
  border: none;
  background: var(--blue-100);
  font-size: 2.4rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow);
}

.flashcard-audio-btn:active {
  background: var(--blue-500);
  transform: scale(0.96);
}

.flashcard-swipe-hint {
  margin-top: 18px;
  font-size: 0.8rem;
  color: var(--ink-soft);
  opacity: 0.7;
}

.flashcard-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

.nav-btn {
  flex: 1;
  background: var(--blue-700);
  color: var(--white);
  border: none;
  border-radius: 14px;
  padding: 14px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
}

.nav-btn:active {
  background: var(--blue-900);
}

.shuffle-btn {
  width: 100%;
  background: var(--blue-100);
  border: 1px solid var(--border);
  color: var(--blue-700);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
}

.shuffle-btn:active {
  background: var(--blue-500);
  color: var(--white);
}