:root {
  --bg: #101827;
  --surface: #1f2937;
  --surface-2: #111827;
  --text: #f9fafb;
  --muted: #d1d5db;
  --primary: #f59e0b;
  --secondary: #60a5fa;
  --success: #34d399;
  --error: #f87171;
  --radius: 14px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(160deg, var(--bg), #172554);
  color: var(--text);
  min-height: 100vh;
}

.app {
  width: min(900px, 100%);
  margin: 0 auto;
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
  padding: 12px;
  gap: 12px;
}

.app-header,
.screen,
.app-footer {
  background: rgba(17, 24, 39, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
}

.app-header {
  padding: 14px;
  text-align: center;
}

.app-header h1 {
  margin: 0;
  font-size: 1.6rem;
}

.app-header p {
  margin: 6px 0 12px;
  color: var(--muted);
}

.progress-wrap {
  width: 100%;
  height: 12px;
  background: #374151;
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), #fbbf24);
  transition: width 0.3s ease;
}

.screen {
  padding: 16px;
}

.card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  padding: 14px;
}

.grid {
  display: grid;
  gap: 12px;
}

.grid-2 {
  grid-template-columns: 1fr;
}

.word-card {
  text-align: center;
  cursor: pointer;
}

.word-emoji {
  font-size: 2.4rem;
  margin-bottom: 8px;
}

.word-label {
  font-size: 1.2rem;
  font-weight: 700;
}

.hint {
  color: var(--muted);
  font-size: 0.95rem;
}

.btn {
  border: none;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  padding: 12px 14px;
  cursor: pointer;
  min-height: 48px;
}

.btn-primary {
  background: var(--primary);
  color: #111827;
}

.btn-secondary {
  background: var(--secondary);
  color: #0f172a;
}

.btn-success {
  background: var(--success);
  color: #052e16;
}

.btn-error {
  background: var(--error);
  color: #450a0a;
}

.btn-block {
  width: 100%;
}

.app-footer {
  padding: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.choice-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
}

.dialogue-line {
  padding: 10px;
  border-radius: 10px;
  margin-bottom: 8px;
  background: #1e3a8a;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.dialogue-row-top {
  display: flex;
  gap: 6px;
  align-items: baseline;
  flex-wrap: wrap;
}

.dialogue-text {
  color: #ffffff;
  font-weight: 600;
}

.dialogue-speaker {
  font-weight: 800;
  color: #fcd34d;
}

.dialogue-tip-text {
  margin: 8px 0 6px;
  padding: 8px;
  border-radius: 8px;
  background: rgba(15, 23, 42, 0.45);
  color: #d1fae5;
  font-size: 0.93rem;
  line-height: 1.4;
}

.dialogue-actions {
  display: flex;
  justify-content: flex-end;
  gap: 6px;
  flex-wrap: wrap;
}

.center {
  text-align: center;
}

.score {
  font-size: 2rem;
  font-weight: 800;
  color: #fcd34d;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 20px;
  transform: translateX(-50%);
  min-width: 220px;
  max-width: 90vw;
  text-align: center;
  background: #111827;
  color: #fff;
  padding: 10px 14px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.toast.show {
  opacity: 1;
}

.karaoke-line {
  padding: 8px;
  border-radius: 8px;
}

.karaoke-line.active {
  background: #f59e0b;
  color: #111827;
  font-weight: 700;
}

.question-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.tip-card {
  margin-top: 12px;
  padding: 12px;
  border-radius: 12px;
  background: #0f766e;
  color: #ecfeff;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.tip-card h4 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.tip-card p {
  margin: 0;
  line-height: 1.45;
}

.tip-content {
  margin-top: 8px;
  display: grid;
  gap: 8px;
}

.is-hidden {
  display: none !important;
}

.tip-btn {
  margin-top: 8px;
  min-height: 40px;
  padding: 8px 12px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 700;
  background: #99f6e4;
  color: #134e4a;
}

@media (min-width: 768px) {
  .screen {
    padding: 22px;
  }

  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}