/* ============================================================
   PRONUNCIATION PRACTICE APP — Styles
   Mobile-first responsive design
   ============================================================ */

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

:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #3730a3;
  --color-primary-light: #c7d2fe;
  --color-primary-bg: #eef2ff;
  --color-correct: #22c55e;
  --color-correct-bg: #dcfce7;
  --color-wrong: #ef4444;
  --color-wrong-bg: #fef2f2;
  --color-bg: #f8fafc;
  --color-card: #ffffff;
  --color-text: #1e1b4b;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-full: 9999px;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---------- Registration Screen ---------- */
.register-section {
  text-align: center;
}

.register-heading {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.register-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 20px;
}

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

.register-input {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.register-input:focus {
  outline: none;
  border-color: var(--color-primary);
}

.register-input.error {
  border-color: var(--color-wrong);
}

.register-error {
  color: var(--color-wrong);
  font-size: 0.82rem;
  margin: 0;
}

.register-privacy {
  margin-top: 20px;
  text-align: left;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  line-height: 1.7;
}

.register-privacy p {
  margin-bottom: 6px;
  font-size: 0.82rem;
  color: var(--color-text);
}

.register-privacy ul {
  list-style: none;
  padding: 0;
}

.register-privacy li::before {
  content: "• ";
  color: var(--color-primary);
}

/* ---------- Utility ---------- */
.hidden {
  display: none !important;
}

.screen {
  display: none;
  padding: 16px;
  max-width: 600px;
  margin: 0 auto;
  animation: fadeIn 0.3s ease;
}

.screen.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Compatibility Warning ---------- */
.compat-warning {
  background: #fef3c7;
  border-bottom: 2px solid #f59e0b;
  padding: 12px 16px;
  text-align: center;
  font-size: 0.85rem;
  color: #92400e;
}

.compat-warning p {
  margin-bottom: 6px;
}

/* ---------- Install Banner ---------- */
.install-banner {
  background: var(--color-primary);
  color: white;
  padding: 12px 16px;
  text-align: center;
  font-size: 0.85rem;
}

.install-banner p {
  margin-bottom: 8px;
}

.install-actions {
  display: flex;
  gap: 8px;
  justify-content: center;
}

/* ---------- Buttons ---------- */
.btn-primary {
  background: var(--color-primary);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  width: 100%;
}

.btn-primary:hover {
  background: var(--color-primary-dark);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: white;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  width: 100%;
}

.btn-secondary:hover {
  background: var(--color-primary-bg);
}

.btn-text {
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 4px 8px;
}

.btn-text:hover {
  color: var(--color-text);
}

.btn-small {
  padding: 6px 14px;
  font-size: 0.85rem;
}

.btn-icon {
  background: none;
  border: none;
  color: var(--color-primary);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
}

.btn-icon:hover {
  background: var(--color-primary-bg);
}

.btn-large {
  padding: 14px 24px;
  font-size: 1.1rem;
}

/* ---------- Cards ---------- */
.card {
  background: var(--color-card);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

/* ---------- App Header ---------- */
.app-header {
  text-align: center;
  padding: 32px 16px 16px;
}

.app-logo {
  width: 120px;
  height: auto;
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
}

.app-title {
  font-size: 1.6rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.app-tagline {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
}

/* ---------- Welcome Content ---------- */
.welcome-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ---------- Input Section ---------- */
.input-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

/* ---------- How to Use (collapsible) ---------- */
.how-to-use {
  border: none;
}

.how-to-summary {
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 4px;
}

.how-to-summary::-webkit-details-marker {
  display: none;
}

.how-to-summary::after {
  content: '▼';
  font-size: 0.6rem;
  transition: transform 0.2s;
  margin-left: 4px;
}

.how-to-use[open] > .how-to-summary::after {
  transform: rotate(180deg);
}

.how-to-content {
  padding-top: 14px;
}

.how-to-steps {
  padding-left: 20px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--color-text);
}

.how-to-steps li {
  margin-bottom: 10px;
}

.how-to-steps li strong {
  color: var(--color-primary-dark);
}

.how-to-legend {
  list-style: none;
  padding-left: 0;
  margin-top: 6px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.how-to-legend li {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 2px;
  font-size: 0.8rem;
}

.how-to-legend .legend-dot {
  flex-shrink: 0;
}

.how-to-note {
  background: #fff7ed;
  border-left: 3px solid #f59e0b;
  padding: 12px 14px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-top: 8px;
  margin-bottom: 12px;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--color-text);
}

.how-to-note p {
  margin-bottom: 6px;
}

.how-to-note p:last-child {
  margin-bottom: 0;
}

.how-to-note-title {
  font-weight: 700;
  font-size: 0.85rem;
  color: #b45309;
}

.how-to-note strong {
  color: #b45309;
}

.how-to-note-mic {
  background: #eff6ff;
  border-left-color: #3b82f6;
}

.how-to-note-mic .how-to-note-title {
  color: #1d4ed8;
}

.how-to-note-mic strong {
  color: #1d4ed8;
}

.how-to-mic-steps {
  padding-left: 18px;
  margin-top: 4px;
  margin-bottom: 0;
}

.how-to-mic-steps li {
  margin-bottom: 4px;
}

.how-to-tip {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  background: var(--color-primary-bg);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-top: 4px;
  line-height: 1.5;
}

.how-to-tip strong {
  color: var(--color-primary-dark);
}

/* ---------- Input Section ---------- */
.textarea-wrapper {
  position: relative;
}

.sentence-textarea {
  width: 100%;
  padding: 12px;
  padding-right: 36px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  line-height: 1.5;
  transition: border-color 0.2s;
}

.sentence-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn-clear-input {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  border: none;
  background: var(--color-border);
  color: var(--color-text-muted);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, color 0.2s;
  line-height: 1;
}

.btn-clear-input:hover {
  background: var(--color-wrong);
  color: white;
}

.input-section .btn-primary {
  margin-top: 12px;
}

.input-hint {
  margin-top: 10px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-align: center;
  line-height: 1.6;
  background: var(--color-primary-bg);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
}

/* ---------- Pronunciation Tip ---------- */
.pronunciation-tip {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  padding: 8px 16px;
  line-height: 1.5;
}

.pronunciation-tip a {
  color: var(--color-primary);
  text-decoration: underline;
  font-weight: 600;
}

.pronunciation-tip a:hover {
  color: var(--color-primary-dark);
}

.r-highlight {
  background: linear-gradient(135deg, #fef3c7, #fde68a);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-bottom: 12px;
  font-size: 0.85rem;
  line-height: 1.5;
  color: #92400e;
}

/* ---------- Phrase Tabs ---------- */
.phrase-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.phrase-tab {
  padding: 5px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-bg);
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.phrase-tab:hover {
  border-color: var(--color-primary-light);
  color: var(--color-primary);
}

.phrase-tab.active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

/* ---------- Quick Phrases ---------- */
.section-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.section-header .section-title {
  margin-bottom: 0;
}

.phrases-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.phrase-chip {
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.phrase-chip:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
}

.phrase-chip:active {
  transform: scale(0.95);
}

/* ---------- History Section ---------- */
.history-list {
  list-style: none;
  max-height: 240px;
  overflow-y: auto;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  transition: background 0.2s;
  gap: 12px;
}

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

.history-item:hover {
  background: var(--color-primary-bg);
  margin: 0 -12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}

.history-sentence {
  font-size: 0.9rem;
  color: var(--color-text);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-score {
  font-size: 0.85rem;
  font-weight: 600;
  white-space: nowrap;
  padding: 2px 10px;
  border-radius: var(--radius-full);
}

.history-score.good {
  background: var(--color-correct-bg);
  color: #16a34a;
}

.history-score.ok {
  background: #fef9c3;
  color: #a16207;
}

.history-score.needs-work {
  background: var(--color-wrong-bg);
  color: #dc2626;
}

/* ---------- Promotion Banner ---------- */
.promo-banner {
  background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #3730a3 100%);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  color: #fff;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.promo-banner::before {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 120px;
  height: 120px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50%;
}

.promo-banner::after {
  content: '';
  position: absolute;
  bottom: -30px;
  left: -30px;
  width: 90px;
  height: 90px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: 50%;
}

.promo-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--radius-full);
  padding: 4px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 16px;
}

.promo-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 6px;
  line-height: 1.4;
}

.promo-subtitle {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.5;
  margin-bottom: 0;
}

.promo-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
  margin: 16px 0;
}

.promo-instructor {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  text-align: left;
}

.promo-instructor-info {
  max-width: 400px;
}

.promo-instructor-name {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.promo-instructor-bio {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.5;
}

.promo-description {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.85);
  line-height: 1.6;
  margin-bottom: 14px;
}

.promo-description strong {
  color: #c7d2fe;
  font-weight: 600;
}

.promo-stats {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.promo-stat {
  font-size: 0.78rem;
  color: rgba(255, 255, 255, 0.75);
  background: rgba(255, 255, 255, 0.08);
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

.promo-pricing {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 16px;
}

.promo-price-original {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.45);
  text-decoration: line-through;
}

.promo-price-discount {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fbbf24;
}

.promo-price-label {
  font-size: 0.7rem;
  font-weight: 600;
  background: #fbbf24;
  color: #1e1b4b;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: uppercase;
}

.promo-cta {
  display: inline-block;
  background: #a78bfa;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 32px;
  border-radius: var(--radius-full);
  transition: background 0.2s, transform 0.2s;
  margin-bottom: 12px;
}

.promo-cta:hover {
  background: #c4b5fd;
  transform: translateY(-1px);
}

.promo-cta:active {
  transform: translateY(0);
}

.promo-note {
  font-size: 0.7rem;
  color: rgba(255, 255, 255, 0.5);
  font-style: italic;
}

/* ---------- Practice Header ---------- */
.practice-header {
  padding: 8px 0;
}

.practice-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

/* ---------- Target Section ---------- */
.target-section {
  width: 100%;
  text-align: center;
}

.target-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.target-text {
  font-size: 1.4rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-text);
}

/* ---------- Record Section ---------- */
.record-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 20px 0;
}

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

.record-btn {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: var(--color-primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  box-shadow: var(--shadow-md);
  position: relative;
}

.record-btn:hover {
  background: var(--color-primary-dark);
  transform: scale(1.05);
}

.record-btn:active {
  transform: scale(0.95);
}

.record-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none;
}

.record-btn.recording {
  background: var(--color-wrong);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.5); }
  70% { box-shadow: 0 0 0 20px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.mic-icon {
  width: 32px;
  height: 32px;
}

.audio-visualizer {
  width: 280px;
  height: 60px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-bg);
  border: 1px solid var(--color-primary-light);
}

/* Mobile: pulsing ring around mic button when recording (no visualizer) */
.record-btn.pulse-recording {
  box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6);
  animation: mobilePulse 1.2s ease-in-out infinite;
}

@keyframes mobilePulse {
  0% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.6); }
  50% { box-shadow: 0 0 0 18px rgba(99, 102, 241, 0); }
  100% { box-shadow: 0 0 0 0 rgba(99, 102, 241, 0); }
}

.interim-text {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  text-align: center;
  font-style: italic;
  min-height: 1.4em;
}

/* ---------- Results Section ---------- */
.results-section {
  width: 100%;
  animation: fadeIn 0.4s ease;
}

.results-card {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* Score Display */
.score-display {
  text-align: center;
  padding: 16px 0;
}

.score-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  border: 4px solid var(--color-border);
  gap: 2px;
}

.score-circle.excellent {
  border-color: var(--color-correct);
  background: var(--color-correct-bg);
}

.score-circle.good {
  border-color: #eab308;
  background: #fef9c3;
}

.score-circle.needs-work {
  border-color: var(--color-wrong);
  background: var(--color-wrong-bg);
}

.score-value {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
}

.score-unit {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

.score-message {
  font-size: 1rem;
  font-weight: 600;
}

/* Word Results */
.comparison-section {
  padding: 0;
}

.comparison-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}

.word-results {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  line-height: 1.8;
}

/* Result Legend */
.result-legend {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 4px;
}

.legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.legend-correct { background: var(--color-correct); }
.legend-unclear { background: #eab308; }
.legend-wrong { background: var(--color-wrong); }

/* Word Chips */
.word-result,
.word-chip {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 500;
  vertical-align: top;
}

.word-heard {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  font-style: italic;
  margin-top: 2px;
  text-decoration: none;
  opacity: 0.8;
}

.word-correct {
  background: var(--color-correct-bg);
  color: #16a34a;
}

.word-unclear {
  background: #fef9c3;
  color: #a16207;
  border: 1px dashed #f59e0b;
}

.word-poor {
  background: #ffedd5;
  color: #c2410c;
  border: 1px dashed #ea580c;
}

.word-wrong {
  background: var(--color-wrong-bg);
  color: #dc2626;
}

.word-wrong > .word-heard {
  color: #991b1b;
}

.spoken-text {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  padding: 10px 14px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
}

/* Result Actions */
.result-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ---------- Responsive ---------- */
@media (min-width: 480px) {
  .screen {
    padding: 24px;
  }

  .app-title {
    font-size: 1.8rem;
  }

  .target-text {
    font-size: 1.6rem;
  }

  .result-actions {
    flex-direction: row;
  }

  .result-actions .btn-primary,
  .result-actions .btn-secondary {
    width: auto;
    flex: 1;
  }
}

@media (min-width: 768px) {
  .screen {
    padding: 32px;
  }

  .app-header {
    padding: 48px 16px 24px;
  }

  .app-title {
    font-size: 2rem;
  }

  .card {
    padding: 24px;
  }
}