:root {
  --primary-color: #3081D0;
  --primary-hover: #2C76BF;
  --bg-color: #FFFFFF;
  --bg-secondary: #F5F5F5;
  --text-primary: #1A1A1A;
  --text-secondary: #666666;
  --border-color: #E0E0E0;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.12);
  --transition: all 0.2s ease;
  --success-color: #28a745;
  --error-color: #dc3545;
  --warning-color: #ffc107;
}

[data-theme="dark"] {
  --primary-color: #4A9FE8;
  --primary-hover: #3A8FD8;
  --bg-color: #1A1A2E;
  --bg-secondary: #16213E;
  --text-primary: #EAEAEA;
  --text-secondary: #A0A0A0;
  --border-color: #2A2A4A;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-color);
  font-size: 14px;
}

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

a:hover {
  color: var(--primary-hover);
}

header {
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}

.logo-icon {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.logo-text {
  display: flex;
  flex-direction: column;
}

.logo-cn {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.2;
}

.logo-en {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.tools-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-primary);
  font-size: 13px;
  transition: var(--transition);
}

.tools-link:hover {
  background-color: var(--border-color);
  color: var(--primary-color);
}

.model-select {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  min-width: 100px;
}

.header-button {
  padding: 8px 16px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 14px;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
}

.header-button:hover {
  background-color: var(--border-color);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-name {
  color: var(--text-secondary);
  font-size: 13px;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  min-height: calc(100vh - 140px);
}

footer {
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
  padding: 16px 0;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  text-align: center;
}

.footer-text {
  color: var(--text-secondary);
  font-size: 13px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

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

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

.btn-block {
  width: 100%;
}

.hidden {
  display: none !important;
}

.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
}

.alert-success {
  background-color: rgba(40, 167, 69, 0.1);
  color: var(--success-color);
  border: 1px solid var(--success-color);
}

.alert-error {
  background-color: rgba(220, 53, 69, 0.1);
  color: var(--error-color);
  border: 1px solid var(--error-color);
}

.flash-messages {
  margin-bottom: 16px;
}

.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  font-size: 20px;
  cursor: pointer;
  z-index: 1000;
  transition: var(--transition);
  box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
  transform: scale(1.1);
}

@media (max-width: 768px) {
  .header-content {
    padding: 8px 12px;
  }
  
  .logo-icon {
    width: 28px;
    height: 28px;
  }
  
  .logo-cn {
    font-size: 16px;
  }
  
  .logo-en {
    display: none;
  }
  
  .model-select {
    min-width: 80px;
    font-size: 12px;
    padding: 6px 10px;
  }
  
  .header-button {
    padding: 6px 12px;
    font-size: 12px;
  }
  
  .user-name {
    display: none;
  }
}