/* Main Styles */

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --bg-color: #f8fafc;
  --surface-color: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius: 8px;
  --radius-sm: 4px;
  --radius-lg: 12px;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  background-color: var(--surface-color);
  box-shadow: var(--shadow);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--primary-color);
}

.nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-secondary);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

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

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

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

.btn-secondary:hover {
  background-color: #475569;
}

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

.btn-danger:hover {
  background-color: #dc2626;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

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

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-error {
  color: var(--error-color);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* Cards */
.card {
  background-color: var(--surface-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 2rem;
  margin-bottom: 2rem;
}

.card-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

/* Auth Pages */
.auth-container {
  max-width: 400px;
  margin: 4rem auto;
  padding: 2rem;
}

.auth-card {
  background-color: var(--surface-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 2.5rem;
}

.auth-title {
  font-size: 2rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 0.5rem;
}

.auth-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.auth-link {
  text-align: center;
  margin-top: 1.5rem;
  color: var(--text-secondary);
}

.auth-link a {
  color: var(--primary-color);
  font-weight: 500;
}

.auth-link a:hover {
  text-decoration: underline;
}

/* Paper Polish Page */
.paper-polish-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 2rem;
}

.paper-polish-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.options-group {
  display: flex;
  gap: 1rem;
  align-items: center;
  margin-bottom: 1rem;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.checkbox-group input[type="checkbox"] {
  width: auto;
  margin: 0;
}

.input-section {
  margin-bottom: 2rem;
}

.result-section {
  margin-top: 2rem;
}

.result-area {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  min-height: 200px;
  max-height: 600px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.result-content {
  line-height: 1.8;
}

.error-message {
  color: var(--error-color);
  padding: 1rem;
  background-color: #fef2f2;
  border-radius: var(--radius);
  border: 1px solid #fecaca;
}

/* Conversation History */
.conversation-history {
  max-height: 400px;
  overflow-y: auto;
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--bg-color);
  border-radius: var(--radius);
}

.history-message {
  margin-bottom: 1rem;
  padding: 1rem;
  background-color: var(--surface-color);
  border-radius: var(--radius);
}

.history-user {
  border-left: 4px solid var(--primary-color);
}

.history-assistant {
  border-left: 4px solid var(--success-color);
}

.history-role {
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.history-content {
  color: var(--text-primary);
  white-space: pre-wrap;
  word-wrap: break-word;
}

/* Usage Info */
.usage-info {
  margin-top: 1rem;
  padding: 1rem;
  background-color: var(--bg-color);
  border-radius: var(--radius);
  display: none;
}

.usage-item {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.usage-item:last-child {
  border-bottom: none;
  font-weight: 600;
}

/* Loading Indicator */
.loading-indicator {
  display: none;
  text-align: center;
  padding: 2rem;
}

.spinner {
  display: inline-block;
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  color: white;
  font-weight: 500;
  z-index: 1000;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

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

.toast-error {
  background-color: var(--error-color);
}

.toast-info {
  background-color: var(--secondary-color);
}

/* Services Tabs */
.services-tabs {
  display: flex;
  gap: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  margin-bottom: 2rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.service-tab {
  padding: 1rem 1.5rem;
  cursor: pointer;
  border: none;
  background: none;
  border-bottom: 3px solid transparent;
  transition: all 0.2s;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  white-space: nowrap;
  position: relative;
}

.service-tab:hover {
  color: var(--primary-color);
  background-color: rgba(37, 99, 235, 0.05);
}

.service-tab.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
  font-weight: 600;
}

.service-content {
  display: none;
}

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

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

/* Responsive */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav {
    width: 100%;
    justify-content: center;
  }
  
  .auth-container {
    margin: 2rem auto;
    padding: 1rem;
  }
  
  .auth-card {
    padding: 1.5rem;
  }
  
  .paper-polish-container {
    padding: 1rem;
  }
  
  .options-group {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .services-tabs {
    gap: 0.25rem;
  }
  
  .service-tab {
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
  }
  
  .toast {
    right: 1rem;
    left: 1rem;
    bottom: 1rem;
  }
}

/* Markdown content styles */
.markdown-content {
  line-height: 1.8;
  color: var(--text-primary);
}

.markdown-content h1,
.markdown-content h2,
.markdown-content h3,
.markdown-content h4,
.markdown-content h5,
.markdown-content h6 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
}

.markdown-content h1 {
  font-size: 2em;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.3em;
}

.markdown-content h2 {
  font-size: 1.5em;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3em;
}

.markdown-content h3 {
  font-size: 1.25em;
}

.markdown-content h4 {
  font-size: 1.1em;
}

.markdown-content p {
  margin: 1em 0;
}

.markdown-content ul,
.markdown-content ol {
  margin: 1em 0;
  padding-left: 2em;
}

.markdown-content li {
  margin: 0.5em 0;
}

.markdown-content code {
  background-color: rgba(0, 0, 0, 0.05);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9em;
  color: #e83e8c;
}

.markdown-content pre {
  background-color: #f6f8fa;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1em;
  overflow-x: auto;
  margin: 1em 0;
}

.markdown-content pre code {
  background-color: transparent;
  padding: 0;
  color: inherit;
  font-size: 0.9em;
}

.markdown-content blockquote {
  border-left: 4px solid var(--primary-color);
  padding-left: 1em;
  margin: 1em 0;
  color: var(--text-secondary);
  font-style: italic;
}

.markdown-content a {
  color: var(--primary-color);
  text-decoration: none;
}

.markdown-content a:hover {
  text-decoration: underline;
}

.markdown-content strong {
  font-weight: 600;
  color: var(--text-primary);
}

.markdown-content em {
  font-style: italic;
}

.markdown-content table {
  border-collapse: collapse;
  margin: 1em 0;
  width: 100%;
}

.markdown-content table th,
.markdown-content table td {
  border: 1px solid var(--border-color);
  padding: 0.5em 1em;
  text-align: left;
}

.markdown-content table th {
  background-color: var(--bg-color);
  font-weight: 600;
}

/* Math formula styles */
.markdown-content .katex {
  font-size: 1.1em;
}

.markdown-content .katex-display {
  margin: 1.5em 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.markdown-content .katex-display > .katex {
  text-align: left;
}