/* 全局样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #a5b4fc;
  --secondary-color: #10b981;
  --accent-color: #f59e0b;
  --danger-color: #ef4444;
  --warning-color: #f59e0b;
  --success-color: #10b981;
  --info-color: #3b82f6;
  
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --bg-gradient-alt: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
  
  --border-color: #e5e7eb;
  --border-focus: #6366f1;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--bg-gradient);
  min-height: 100vh;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* 头部样式 */
header {
  text-align: center;
  margin-bottom: 40px;
  color: white;
  position: relative;
}

header::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: linear-gradient(90deg, #f093fb 0%, #f5576c 100%);
  border-radius: 2px;
}

header h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 16px;
  text-shadow: 0 4px 8px rgba(0,0,0,0.3);
  background: linear-gradient(135deg, #ffffff 0%, #f0f9ff 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.025em;
}

.subtitle {
  font-size: 1.25rem;
  opacity: 0.9;
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.5;
}

/* 主内容区域 */
main {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-xl);
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}

main::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--bg-gradient-alt);
}

/* 消息提示样式 */
.messages {
  margin-bottom: 24px;
}

.message {
  padding: 16px 20px;
  border-radius: var(--radius-lg);
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  animation: slideIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-md);
  border-left: 4px solid;
  position: relative;
  overflow: hidden;
}

.message::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: currentColor;
  opacity: 0.3;
}

.message-success {
  background: #ecfdf5;
  color: #065f46;
  border-left-color: var(--success-color);
}

.message-error {
  background: #fef2f2;
  color: #991b1b;
  border-left-color: var(--danger-color);
}

.message-warning {
  background: #fffbeb;
  color: #92400e;
  border-left-color: var(--warning-color);
}

.message-info {
  background: #eff6ff;
  color: #1e40af;
  border-left-color: var(--info-color);
}

.message-close {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  opacity: 0.6;
  margin-left: 12px;
  transition: var(--transition);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.message-close:hover {
  opacity: 1;
  background: rgba(0, 0, 0, 0.1);
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* 表单样式 */
.form-group {
  margin-bottom: 32px;
  position: relative;
  animation: fadeInUp 0.6s ease-out;
}

.form-group:nth-child(1) { animation-delay: 0.1s; }
.form-group:nth-child(2) { animation-delay: 0.2s; }
.form-group:nth-child(3) { animation-delay: 0.3s; }

.form-group::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition-slow);
}

.form-group.focused::after {
  width: 100%;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
  letter-spacing: 0.025em;
}

.form-group.focused label {
  color: var(--primary-color);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 16px 20px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 16px;
  transition: var(--transition-slow);
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
  background: var(--bg-primary);
  transform: translateY(-2px);
}

.form-group input:hover,
.form-group textarea:hover {
  border-color: var(--primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.form-group small {
  display: block;
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.4;
}

/* 字符计数样式 */
.char-count {
  font-weight: 500;
  margin-left: 8px;
}

/* 按钮样式 */
.form-actions {
  display: flex;
  gap: 16px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.btn-primary,
.btn-secondary {
  padding: 16px 32px;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-slow);
  min-width: 160px;
  position: relative;
  overflow: hidden;
  letter-spacing: 0.025em;
}

.btn-primary {
  background: var(--bg-gradient);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: var(--transition-slow);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-3px);
  box-shadow: 0 20px 25px -5px rgba(99, 102, 241, 0.3), 0 10px 10px -5px rgba(99, 102, 241, 0.2);
}

.btn-primary:hover:not(:disabled)::before {
  left: 100%;
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.btn-download {
  background: var(--success-color);
  color: white;
  padding: 12px 24px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-sm);
}

.btn-download:hover {
  background: #059669;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

/* 图标样式 */
.label-icon,
.btn-icon,
.preview-icon,
.feature-icon,
.tip-icon,
.notice-icon,
.download-icon {
  display: inline-block;
  margin-right: 8px;
  font-size: 1.1em;
  vertical-align: middle;
}

.btn-icon {
  margin-right: 6px;
}

.form-group.focused .label-icon {
  transform: scale(1.1);
  transition: var(--transition);
}

.btn-primary:hover .btn-icon,
.btn-secondary:hover .btn-icon {
  transform: scale(1.1);
  transition: var(--transition);
}

/* 加载动画 */
.loading-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #ffffff;
  animation: spin 1s ease-in-out infinite;
  margin-right: 8px;
}

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

/* 项目预览样式 */
.project-preview {
  margin-top: 40px;
  padding: 32px;
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  border-left: 6px solid var(--primary-color);
  box-shadow: var(--shadow-lg);
  position: relative;
  animation: slideInUp 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-preview::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--primary-light), transparent);
}

.project-preview h3 {
  margin-bottom: 20px;
  color: var(--text-primary);
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 12px;
}

.preview-item {
  margin-bottom: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.preview-item:last-child {
  border-bottom: none;
  margin-bottom: 0;
}

.preview-item strong {
  color: var(--text-primary);
  font-weight: 600;
  margin-right: 8px;
}

.preview-item.warning {
  color: #92400e;
  background: #fffbeb;
  padding: 16px;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--warning-color);
  margin: 16px 0;
}

.preview-item ul {
  margin: 12px 0;
  padding-left: 24px;
}

.preview-item li {
  margin-bottom: 6px;
  color: var(--text-secondary);
}

/* 页脚样式 */
footer {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  margin-top: 48px;
}

.features,
.tips,
.notice {
  background: rgba(255, 255, 255, 0.95);
  padding: 32px;
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.2);
  position: relative;
  overflow: hidden;
  transition: var(--transition-slow);
}

.features:hover,
.tips:hover,
.notice:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.features::before,
.tips::before,
.notice::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--bg-gradient);
}

.features h3,
.tips h3,
.notice h3 {
  margin-bottom: 20px;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 12px;
}

.features ul,
.tips ul {
  list-style: none;
}

.features li,
.tips li {
  margin-bottom: 12px;
  padding-left: 28px;
  position: relative;
  color: var(--text-secondary);
  line-height: 1.6;
}

.features li:before,
.tips li:before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success-color);
  font-weight: bold;
  font-size: 1.1rem;
  background: #ecfdf5;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
}

.notice p {
  margin-bottom: 12px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.notice code {
  background: var(--bg-tertiary);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-family: 'JetBrains Mono', 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

/* 动画效果 */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 16px;
  }
  
  header h1 {
    font-size: 2.25rem;
  }
  
  .subtitle {
    font-size: 1.125rem;
  }
  
  main {
    padding: 32px 24px;
  }
  
  .form-actions {
    flex-direction: column;
  }
  
  .btn-primary,
  .btn-secondary {
    width: 100%;
  }
  
  footer {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .features,
  .tips,
  .notice {
    padding: 24px;
  }
  
  .label-icon,
  .btn-icon,
  .preview-icon,
  .feature-icon,
  .tip-icon,
  .notice-icon {
    font-size: 1em;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 2rem;
  }
  
  main {
    padding: 24px 20px;
  }
  
  .form-group input,
  .form-group textarea {
    font-size: 16px; /* 防止iOS缩放 */
    padding: 14px 16px;
  }
  
  .btn-primary,
  .btn-secondary {
    padding: 14px 24px;
    font-size: 15px;
  }
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
  :root {
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    
    --bg-primary: #1f2937;
    --bg-secondary: #374151;
    --bg-tertiary: #4b5563;
    
    --border-color: #4b5563;
    --border-focus: #6366f1;
  }
  
  body {
    background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  }
  
  .features,
  .tips,
  .notice {
    background: rgba(31, 41, 55, 0.95);
    border: 1px solid rgba(75, 85, 99, 0.3);
  }
}

/* 无障碍支持 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* 高对比度模式 */
@media (prefers-contrast: high) {
  :root {
    --primary-color: #000000;
    --text-primary: #000000;
    --bg-primary: #ffffff;
    --border-color: #000000;
  }
  
  .btn-primary {
    background: #000000;
    color: #ffffff;
  }
  
  .btn-secondary {
    background: #ffffff;
    color: #000000;
    border: 2px solid #000000;
  }
}

/* 打印样式 */
@media print {
  .form-actions,
  .messages,
  .project-preview {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  main {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}