/* Italiano Vivo — Design System */
:root {
  /* Cores da bandeira italiana + neutros */
  --verde: #009246;
  --bianco: #ffffff;
  --rosso: #ce2b37;
  --bg: #f8f9fa;
  --surface: #ffffff;
  --text: #1a1a2e;
  --text-muted: #6c757d;
  --border: #e2e8f0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

#root {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  padding: 16px;
}

/* Tipografia */
h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 8px;
}

h2 {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 12px;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 8px;
}

p {
  margin-bottom: 8px;
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.text-it {
  font-style: italic;
  color: var(--verde);
}

/* Cards */
.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

/* Botões */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--verde);
  color: var(--bianco);
}

.btn-primary:hover {
  background: #007a3a;
}

.btn-secondary {
  background: var(--border);
  color: var(--text);
}

.btn-secondary:hover {
  background: #d1d5db;
}

.btn-danger {
  background: var(--rosso);
  color: var(--bianco);
}

.btn-record {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--rosso);
  color: white;
  font-size: 1.5rem;
  border: 3px solid #ff6b7a;
}

.btn-record.recording {
  animation: pulse 1.2s infinite;
  background: #ff4757;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.08); }
}

.audio-pair {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-shrink: 0;
}

.btn-play {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--verde);
  color: white;
  font-size: 1.2rem;
  flex-shrink: 0;
  transition: transform 0.1s ease, background 0.2s ease;
}

.btn-play.playing {
  animation: pulse 1s infinite;
}

.btn-slow {
  background: #6c757d;
  font-size: 1.1rem;
}

.btn-fast {
  background: var(--verde);
  font-size: 1.1rem;
}

/* Trail badges */
.trail-badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.trail-bambino { background: #d4edda; color: #155724; }
.trail-viaggio { background: #cce5ff; color: #004085; }
.trail-vivere { background: #fff3cd; color: #856404; }

/* Feedback cards */
.feedback-axis {
  padding: 12px;
  border-left: 4px solid var(--border);
  margin-bottom: 8px;
  background: var(--bg);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.feedback-axis.success { border-left-color: var(--verde); }
.feedback-axis.warning { border-left-color: #ffc107; }
.feedback-axis.error { border-left-color: var(--rosso); }

.natural-version {
  background: #e8f5e9;
  padding: 10px 14px;
  border-radius: var(--radius);
  margin: 8px 0;
  font-size: 1.05rem;
}

.natural-version::before {
  content: "🇮🇹 Um italiano diria: ";
  font-weight: 700;
  font-size: 0.85rem;
  display: block;
  margin-bottom: 4px;
  color: var(--verde);
}

/* Voice booth */
.voice-booth {
  text-align: center;
  padding: 24px 16px;
  background: linear-gradient(135deg, #f8f9fa, #e8f5e9);
  border-radius: var(--radius);
  margin: 16px 0;
}

.voice-booth p {
  margin-bottom: 16px;
  font-size: 1.1rem;
}

/* Grammar errors list */
.grammar-error {
  padding: 8px 12px;
  background: #fff3cd;
  border-radius: 8px;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

.grammar-error .fix {
  color: var(--verde);
  font-weight: 600;
}

.grammar-error.blocks_understanding {
  background: #f8d7da;
}

/* SRS flashcard */
.flashcard {
  perspective: 1000px;
  min-height: 200px;
  cursor: pointer;
}

.flashcard-inner {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  box-shadow: var(--shadow);
  border: 2px solid var(--border);
  min-height: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.flashcard-inner .it {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--verde);
  margin-bottom: 8px;
}

.flashcard-inner .pt {
  font-size: 1rem;
  color: var(--text-muted);
}

.rating-buttons {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
}

.rating-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--surface);
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s;
}

.rating-btn:hover { border-color: var(--verde); color: var(--verde); }
.rating-btn.selected { background: var(--verde); color: white; border-color: var(--verde); }

/* Loading & Error states */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.error-banner {
  background: #f8d7da;
  color: #721c24;
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
}

/* Navigation */
.nav-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.nav-tab {
  padding: 8px 16px;
  border-radius: 20px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.2s;
}

.nav-tab.active {
  background: var(--verde);
  color: white;
  border-color: var(--verde);
}

/* Chunk list */
.chunk-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-bottom: 1px solid var(--border);
}

.chunk-item:last-child { border-bottom: none; }

.chunk-text {
  flex: 1;
}

.chunk-text .it {
  font-weight: 600;
  color: var(--verde);
}

.chunk-text .pt {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Dialogue */
.dialogue-line {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 0;
}

.dialogue-line.learner {
  flex-direction: row-reverse;
}

.dialogue-bubble {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 0.95rem;
}

.dialogue-line.italian .dialogue-bubble {
  background: #e8f5e9;
  border-bottom-left-radius: 4px;
}

.dialogue-line.learner .dialogue-bubble {
  background: #e3f2fd;
  border-bottom-right-radius: 4px;
}

/* Dissent button */
.dissent-btn {
  margin-top: 12px;
  padding: 8px 16px;
  background: transparent;
  border: 1px dashed var(--text-muted);
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
}

.dissent-btn:hover {
  border-color: var(--verde);
  color: var(--verde);
}

/* Header */
.app-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--verde);
}

.app-header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.flag {
  display: inline-flex;
  width: 32px;
  height: 22px;
  border-radius: 3px;
  overflow: hidden;
}

.flag span {
  flex: 1;
}

.flag .green { background: var(--verde); }
.flag .white { background: var(--bianco); border: 1px solid #ddd; }
.flag .red { background: var(--rosso); }