/* 基础样式重置和现代化设计 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: #1a1a1a;
  background-color: #ffffff;
}

/* 容器和布局 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  line-height: 1;
  border-radius: 0.5rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  min-height: 3rem; /* 48px */
}

.btn-primary {
  background-color: #0066FF;
  color: white;
}

.btn-primary:hover {
  background-color: #0052cc;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: #f8f9fa;
  color: #1a1a1a;
  border: 1px solid #e9ecef;
}

.btn-secondary:hover {
  background-color: #e9ecef;
}

/* 输入框样式 */
.input {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  background-color: white;
  transition: border-color 0.2s ease;
  min-height: 3rem; /* 48px */
}

.input:focus {
  outline: none;
  border-color: #0066FF;
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

/* 选择框样式 */
.select {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  background-color: white;
  cursor: pointer;
  min-height: 3rem; /* 48px */
}

/* 卡片样式 */
.card {
  background: white;
  border-radius: 0.75rem;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border: 1px solid #f3f4f6;
}

/* 导航栏样式 */
.navbar {
  background: white;
  border-bottom: 1px solid #f3f4f6;
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 5rem; /* 80px */
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: #1a1a1a;
  text-decoration: none;
}

/* 标签页样式 */
.tabs {
  display: flex;
  border-bottom: 1px solid #e5e7eb;
  margin-bottom: 2rem;
}

.tab {
  padding: 0.75rem 1.5rem;
  font-weight: 500;
  color: #6b7280;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 3rem; /* 48px */
}

.tab.active {
  color: #0066FF;
  border-bottom-color: #0066FF;
}

/* 文件上传区域 */
.upload-area {
  border: 2px dashed #d1d5db;
  border-radius: 0.75rem;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: #f9fafb;
}

.upload-area:hover {
  border-color: #0066FF;
  background-color: #f0f9ff;
}

.upload-area.dragover {
  border-color: #0066FF;
  background-color: #eff6ff;
}

/* 文本区域 */
.textarea {
  width: 100%;
  min-height: 8rem;
  padding: 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.5rem;
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
  background-color: white;
}

.textarea:focus {
  outline: none;
  border-color: #0066FF;
  box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .card {
    padding: 1.5rem;
  }
  
  .btn {
    width: 100%;
    margin-bottom: 0.75rem;
  }
  
  .tabs {
    flex-direction: column;
  }
  
  .tab {
    text-align: center;
  }
}

/* 工具类 */
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.mb-4 { margin-bottom: 1rem; }
.mt-4 { margin-top: 1rem; }
.space-y-4 > * + * { margin-top: 1rem; }