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

:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #8b5cf6;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --bg-dark: #0f172a;
  --bg-card: #1e293b;
  --bg-input: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --border: #475569;
  --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
}

body {
  font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* Header */
.header {
  background: var(--gradient);
  padding: 2rem;
  text-align: center;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.header p {
  opacity: 0.9;
  font-size: 1rem;
}

/* Tabs Navigation */
.tabs {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem;
  background: var(--bg-card);
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  background: transparent;
  border: 2px solid transparent;
  color: var(--text-secondary);
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-input);
}

.tab-btn.active {
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

/* Main Content */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Section Header */
.section-header {
  text-align: center;
  margin-bottom: 2rem;
}

.section-header h2 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.section-header p {
  color: var(--text-secondary);
}

/* Form Elements */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-weight: 500;
}

input[type="text"],
input[type="file"],
textarea,
select {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--primary);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background: var(--gradient);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-success {
  background: var(--success);
  color: white;
}

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

.btn-large {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Settings Grid */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

/* Conversation Settings */
.conversation-settings {
  background: var(--bg-card);
  padding: 1rem 1.5rem;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.conversation-settings .setting-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.conversation-settings label {
  color: var(--text-secondary);
  white-space: nowrap;
}

.conversation-settings select {
  min-width: 200px;
}

/* Conversation Segments */
.conversation-segments {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.segment-card {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1.25rem;
  border: 1px solid var(--border);
  position: relative;
  transition: border-color 0.3s ease;
}

.segment-card:hover {
  border-color: var(--primary);
}

.segment-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.segment-number {
  background: var(--primary);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.9rem;
}

.segment-controls {
  display: flex;
  gap: 0.5rem;
}

.segment-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.segment-btn:hover {
  color: var(--text-primary);
  background: var(--bg-input);
}

.segment-btn.delete:hover {
  color: var(--danger);
}

.segment-content {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 1rem;
  align-items: start;
}

.segment-voice-select {
  width: 100%;
}

.segment-text {
  width: 100%;
  min-height: 80px;
  resize: vertical;
}

.segment-voice-settings {
  display: flex;
  gap: 1rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.segment-voice-settings .setting-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.segment-voice-settings input[type="range"] {
  width: 80px;
}

/* Segment Actions */
.segment-actions {
  text-align: center;
  margin-bottom: 1.5rem;
}

/* Generation Actions */
.generation-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

/* Results Area */
.results-area {
  background: var(--bg-card);
  border-radius: 12px;
  padding: 1.5rem;
}

.results-area h3 {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.result-item {
  background: var(--bg-input);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.result-item .result-info {
  flex: 1;
}

.result-item .result-voice {
  font-weight: 600;
  color: var(--primary);
}

.result-item .result-text {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 400px;
}

.result-item audio {
  height: 36px;
}

.result-audio-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.5rem;
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.volume-control input[type="range"] {
  width: 80px;
}

.volume-control i {
  font-size: 0.75rem;
}

.result-item.error {
  border-left: 3px solid var(--danger);
}

.result-item.error .result-error {
  color: var(--danger);
  font-size: 0.85rem;
}

/* Result Area (Single) */
.result-area {
  margin-top: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: 12px;
}

.result-area audio {
  width: 100%;
  margin-top: 1rem;
}

.result-info p {
  color: var(--text-secondary);
}

.result-info span {
  color: var(--primary);
  font-weight: 600;
}

/* Clone Steps */
.clone-steps {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.step {
  display: flex;
  gap: 1rem;
  background: var(--bg-card);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.step-number {
  background: var(--gradient);
  color: white;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  margin-bottom: 0.5rem;
}

.step-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.upload-status {
  margin-top: 0.5rem;
  font-size: 0.9rem;
}

.upload-status.success {
  color: var(--success);
}

.upload-status.error {
  color: var(--danger);
}

.checkbox-group {
  display: flex;
  gap: 1.5rem;
  margin-top: 1rem;
}

.checkbox-group label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
}

/* Voice Lists */
.voice-lists {
  margin-top: 1.5rem;
}

.voice-category {
  margin-bottom: 2rem;
}

.voice-category h3 {
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-secondary);
}

.voice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.voice-card {
  background: var(--bg-card);
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
}

.voice-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.voice-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.voice-card-name {
  font-weight: 600;
  color: var(--text-primary);
}

.voice-card-type {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  background: var(--bg-input);
  color: var(--text-secondary);
}

.voice-card-id {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: monospace;
  word-break: break-all;
  margin-bottom: 0.75rem;
}

.voice-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.voice-card-actions {
  display: flex;
  gap: 0.5rem;
}

.voice-card-actions .btn {
  padding: 0.5rem 0.75rem;
  font-size: 0.85rem;
}

/* Footer */
.footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.loading-spinner {
  text-align: center;
}

.loading-spinner i {
  font-size: 3rem;
  color: var(--primary);
  margin-bottom: 1rem;
}

.loading-spinner p {
  color: var(--text-primary);
  font-size: 1.1rem;
}

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

/* Responsive */
@media (max-width: 768px) {
  .header h1 {
    font-size: 1.5rem;
  }
  
  .tabs {
    gap: 0.25rem;
    padding: 0.75rem;
  }
  
  .tab-btn {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
  }
  
  .tab-btn span {
    display: none;
  }
  
  .main-content {
    padding: 1rem;
  }
  
  .segment-content {
    grid-template-columns: 1fr;
  }
  
  .generation-actions {
    flex-direction: column;
  }
  
  .btn-large {
    width: 100%;
    justify-content: center;
  }
}

/* Voice select optgroup styling */
.voice-select optgroup {
  font-weight: 600;
  color: var(--primary);
  background: var(--bg-card);
}

.voice-select option {
  padding: 0.5rem;
  color: var(--text-primary);
  background: var(--bg-input);
}