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

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(255, 255, 255, 0.03);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  --accent: #e94560;
  --accent-hover: #ff6b6b;
  --success: #4ade80;
  --warning: #fbbf24;
  --danger: #f87171;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-logo {
  height: 40px;
  width: auto;
}

.app-name {
  font-size: 14px;
  color: var(--text-muted);
  border-left: 1px solid var(--border-color);
  padding-left: 12px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-display {
  font-size: 14px;
  color: var(--text-secondary);
}

.logout-btn {
  padding: 8px 16px;
  font-size: 14px;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

/* Main Layout */
.app-main {
  padding: 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.content-wrapper {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
}

/* Form Section */
.form-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 32px;
}

.form-section h2 {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.form-group {
  margin-bottom: 24px;
  position: relative;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group .optional {
  font-weight: 400;
  color: var(--text-muted);
}

.form-group input[type="text"],
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 14px 16px;
  font-size: 15px;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  outline: none;
  transition: all 0.2s ease;
  font-family: inherit;
}

.form-group input[type="text"]::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input[type="text"]:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.05);
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23ffffff60' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
}

.form-group select option {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.char-count {
  position: absolute;
  right: 12px;
  bottom: -20px;
  font-size: 12px;
  color: var(--text-muted);
}

/* Radio Group */
.radio-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all 0.2s ease;
}

.radio-label:hover {
  background: rgba(255, 255, 255, 0.05);
}

.radio-label input[type="radio"] {
  accent-color: var(--accent);
}

.radio-label input[type="radio"]:checked + span {
  color: var(--text-primary);
}

.radio-label span {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Buttons */
.generate-btn {
  width: 100%;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--accent) 0%, #c73e54 100%);
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 8px;
}

.generate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 24px -8px rgba(233, 69, 96, 0.4);
}

.generate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.generate-btn .btn-loading {
  display: none;
}

.generate-btn.loading .btn-text {
  display: none;
}

.generate-btn.loading .btn-loading {
  display: inline;
}

/* Results Section */
.results-section {
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
}

.results-section h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
}

.caption-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}

.caption-card textarea {
  width: 100%;
  min-height: 100px;
  padding: 12px;
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-primary);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  resize: vertical;
  font-family: inherit;
}

.caption-card textarea:focus {
  outline: none;
  border-color: rgba(255, 255, 255, 0.2);
}

.caption-meta {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-top: 12px;
  gap: 16px;
}

.platform-warnings {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.platform-warning {
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.platform-warning .indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.platform-warning .indicator.green {
  background: var(--success);
}

.platform-warning .indicator.yellow {
  background: var(--warning);
}

.platform-warning .indicator.red {
  background: var(--danger);
}

.platform-warning .label {
  color: var(--text-muted);
}

.platform-warning .status {
  color: var(--text-secondary);
}

.caption-actions {
  display: flex;
  gap: 8px;
  align-items: center;
}

.char-display {
  font-size: 13px;
  color: var(--text-muted);
  margin-right: 8px;
}

.copy-btn {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

.copy-btn.copied {
  background: var(--success);
  color: #000;
}

.generate-more-btn {
  width: 100%;
  padding: 14px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  margin-top: 8px;
}

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

/* History Sidebar */
.history-sidebar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  height: fit-content;
  position: sticky;
  top: 88px;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
}

.history-header h3 {
  font-size: 16px;
  font-weight: 600;
}

.toggle-history {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
}

.history-content {
  max-height: calc(100vh - 200px);
  overflow-y: auto;
}

.history-list {
  padding: 12px;
}

.history-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 24px;
  font-size: 14px;
}

.history-item {
  padding: 14px;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.history-item:hover {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.12);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 6px;
}

.history-item-tour {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
}

.history-item-delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 6px;
  font-size: 16px;
  line-height: 1;
  border-radius: 4px;
  transition: all 0.2s ease;
}

.history-item-delete:hover {
  color: var(--danger);
  background: rgba(248, 113, 113, 0.1);
}

.history-item-topic {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 4px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-time {
  font-size: 11px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .content-wrapper {
    grid-template-columns: 1fr;
  }

  .history-sidebar {
    position: static;
  }

  .toggle-history {
    display: block;
  }

  .history-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }

  .history-sidebar.expanded .history-content {
    max-height: 400px;
    overflow-y: auto;
  }

  .toggle-icon::before {
    content: '+';
    font-size: 20px;
  }

  .history-sidebar.expanded .toggle-icon::before {
    content: '-';
  }
}

@media (max-width: 600px) {
  .app-header {
    padding: 12px 16px;
  }

  .app-name {
    display: none;
  }

  .app-main {
    padding: 16px;
  }

  .form-section {
    padding: 20px;
  }

  .radio-group {
    flex-direction: column;
  }

  .radio-label {
    width: 100%;
  }

  .caption-meta {
    flex-direction: column;
  }

  .caption-actions {
    width: 100%;
    justify-content: space-between;
  }
}