/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #fef9f0;
  --surface: #ffffff;
  --border: #ede7dd;
  --text: #2c2c2c;
  --text-muted: #8a8078;
  --accent: #e8734a;
  --accent-light: #fef0eb;
  --accent-dark: #c95a35;
  --blue: #4a6fa5;
  --blue-light: #e8eff8;
  --green: #27ae60;
  --green-light: #e8f8ef;
  --gold: #f0c040;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,.06);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== Screens ===== */
.screen { display: none; min-height: 100vh; padding: 1.5rem; }
.screen.active { display: flex; flex-direction: column; align-items: center; }

/* ===== Landing ===== */
.center-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 80vh;
  text-align: center;
  gap: 1rem;
}
.mascot { font-size: 4rem; animation: bounce 2s ease-in-out infinite; }
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.center-box h1 { font-size: 2.5rem; font-weight: 800; letter-spacing: -0.03em; color: var(--accent); }
.tagline { color: var(--text-muted); font-size: 1.1rem; }
.load-area { margin-top: 1.5rem; }
.load-btn { font-size: 1.1rem; padding: 0.9rem 2rem; cursor: pointer; }
.hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.5rem; }
.hint code { background: var(--border); padding: 0.1rem 0.4rem; border-radius: 4px; font-size: 0.75rem; }

/* ===== Progress Bar ===== */
.progress-bar {
  width: 100%;
  max-width: 600px;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  margin-bottom: 1rem;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.4s ease;
  width: 0%;
}

/* ===== Step Badge ===== */
.step-badge {
  display: inline-block;
  padding: 0.3rem 1rem;
  background: var(--accent-light);
  color: var(--accent);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
}

/* ===== Scene Display ===== */
.scene-display {
  width: 100%;
  max-width: 640px;
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.scene-image-wrap {
  width: 100%;
  aspect-ratio: 16/9;
  background: #f0ebe3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}
.scene-image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: none;
}
.scene-image-wrap img.visible { display: block; }
.img-placeholder { font-size: 2rem; color: var(--text-muted); }

.scene-content { padding: 1.25rem; display: flex; flex-direction: column; gap: 0.75rem; }

/* Connector bubble */
.connector-bubble {
  display: inline-block;
  padding: 0.2rem 0.75rem;
  background: var(--blue-light);
  color: var(--blue);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
  align-self: flex-start;
}
.connector-bubble:empty { display: none; }

/* Keywords */
.keywords-display {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.kw-chip {
  padding: 0.2rem 0.6rem;
  background: var(--gold);
  color: #5a4800;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 700;
}

/* Sentence display */
.sentence-display {
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.8;
  padding: 0.5rem 0;
}
.sentence-display .highlight {
  background: var(--gold);
  padding: 0.1rem 0.3rem;
  border-radius: 4px;
  font-weight: 700;
}

/* Masked sentence */
.masked-sentence {
  font-size: 1.2rem;
  font-weight: 500;
  line-height: 1.8;
  padding: 0.5rem 0;
}
.masked-word {
  display: inline-block;
  min-width: 3rem;
  border-bottom: 3px solid var(--accent);
  text-align: center;
  margin: 0 0.15rem;
  color: transparent;
  position: relative;
}
.masked-word::after {
  content: '?';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}
.visible-word { margin: 0 0.15rem; }

/* Audio button */
.btn-audio {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--blue-light);
  color: var(--blue);
  border: 1px solid var(--blue);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  align-self: flex-start;
  transition: all 0.15s;
}
.btn-audio:hover { background: var(--blue); color: #fff; }
.btn-audio:disabled { opacity: 0.4; cursor: not-allowed; }

/* ===== Record Area ===== */
.record-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
}
.btn-record {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  border: 4px solid var(--accent);
  background: var(--surface);
  font-size: 1.8rem;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn-record:hover { background: var(--accent-light); transform: scale(1.05); }
.btn-record.recording {
  background: var(--accent);
  animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(232,115,74,0.4); }
  50% { box-shadow: 0 0 0 16px rgba(232,115,74,0); }
}
.btn-record-large { width: 88px; height: 88px; font-size: 2.2rem; }
.record-status { font-size: 0.85rem; color: var(--text-muted); font-weight: 500; }

/* ===== Transcript & Score ===== */
.transcript-area { padding: 1rem 0; }
.transcript-area.hidden, .finale-result.hidden, .video-output.hidden { display: none; }
.transcript-label { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-muted); margin-bottom: 0.3rem; }
.transcript-text {
  font-size: 1rem;
  padding: 0.75rem 1rem;
  background: #f5f5f0;
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--blue);
  margin-bottom: 0.75rem;
}
.score-display {
  font-size: 2rem;
  font-weight: 800;
  color: var(--green);
  text-align: center;
  padding: 0.5rem 0;
}
.feedback {
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 0.5rem 0.75rem;
  background: var(--green-light);
  border-radius: var(--radius-sm);
}
.feedback.has-error { background: var(--accent-light); color: var(--accent-dark); }

/* ===== Filmstrip ===== */
.filmstrip-wrap {
  width: 100%;
  max-width: 800px;
  overflow-x: auto;
  padding: 1rem 0;
  margin-bottom: 1rem;
  -webkit-overflow-scrolling: touch;
}
.filmstrip {
  display: flex;
  gap: 1rem;
  padding: 0.5rem;
}
.film-frame {
  flex: 0 0 180px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  overflow: hidden;
  text-align: center;
  border: 2px solid var(--border);
  transition: border-color 0.2s;
}
.film-frame.active-frame { border-color: var(--accent); }
.film-frame img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  display: block;
}
.film-frame .frame-placeholder {
  width: 100%;
  aspect-ratio: 16/9;
  background: #f0ebe3;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-muted);
}
.film-frame .frame-connector {
  padding: 0.4rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue);
  background: var(--blue-light);
}

/* ===== Navigation ===== */
.nav-row {
  display: flex;
  gap: 1rem;
  width: 100%;
  max-width: 640px;
  justify-content: space-between;
}

.finale-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.finale-result, .video-output {
  width: 100%;
  max-width: 640px;
  text-align: center;
}

/* ===== Buttons (shared) ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-secondary {
  padding: 0.5rem 1rem;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover { background: var(--accent-light); }
.btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  .scene-display { border-radius: 0; }
  .filmstrip-wrap { max-width: 100vw; }
  .film-frame { flex: 0 0 140px; }
}