/* 全局样式 */
:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #10b981;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  color: var(--gray-800);
  line-height: 1.5;
  background-color: var(--gray-50);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* 导航栏 */
.navbar {
  background-color: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  max-width: 1280px;
  margin: 0 auto;
}

.logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--gray-900);
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  color: var(--gray-700);
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.mobile-menu-button {
  display: none;
}

/* 页脚 */
.footer {
  background-color: white;
  padding: 2rem 0;
  border-top: 1px solid var(--gray-200);
}

.footer-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.footer-link {
  color: var(--gray-600);
  font-size: 0.875rem;
}

.footer-copyright {
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  font-weight: 500;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  border: none;
}

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

.btn-outline {
  background-color: white;
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-outline:hover {
  background-color: var(--gray-50);
}

/* 卡片 */
.card {
  background-color: white;
  border-radius: 0.5rem;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: box-shadow 0.3s ease;
}

.card:hover {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-content {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-900);
  margin-bottom: 0.5rem;
}

.card-text {
  color: var(--gray-600);
  margin-bottom: 1rem;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background-color: var(--gray-100);
  color: var(--gray-800);
  border-radius: 9999px;
  font-size: 0.75rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
}

/* 英雄区域 */
.hero {
  padding: 5rem 0;
  background-color: white;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--gray-600);
  max-width: 48rem;
  margin: 0 auto 2rem;
}

.hero-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
}

/* 部分标题 */
.section {
  padding: 4rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 1rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--gray-600);
  margin-bottom: 3rem;
  text-align: center;
}

/* 网格布局 */
.grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: 2rem;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 筛选按钮 */
.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}

.filter-button {
  padding: 0.5rem 1rem;
  border-radius: 9999px;
  font-size: 0.875rem;
  font-weight: 500;
  background-color: var(--gray-100);
  color: var(--gray-800);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-button:hover {
  background-color: var(--gray-200);
}

.filter-button.active {
  background-color: var(--primary);
  color: white;
}

/* 联系表单 */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--gray-700);
}

.form-input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: 0.375rem;
  background-color: white;
  color: var(--gray-800);
  transition: border-color 0.2s ease;
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-menu-button {
    display: block;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.125rem;
  }
  
  .section-title {
    font-size: 1.75rem;
  }
}

/* 动画 */
.fade-in {
  animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 工具类 */
.text-center {
  text-align: center;
}

.mb-1 {
  margin-bottom: 0.25rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-8 {
  margin-bottom: 2rem;
}

.mt-4 {
  margin-top: 1rem;
}

.mt-8 {
  margin-top: 2rem;
}

.py-2 {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.px-4 {
  padding-left: 1rem;
  padding-right: 1rem;
}

.rounded-full {
  border-radius: 9999px;
}

.flex {
  display: flex;
}

.items-center {
  align-items: center;
}

.justify-between {
  justify-content: space-between;
}

.justify-center {
  justify-content: center;
}

.gap-2 {
  gap: 0.5rem;
}

.gap-4 {
  gap: 1rem;
}

.flex-wrap {
  flex-wrap: wrap;
}

.w-full {
  width: 100%;
}

.max-w-md {
  max-width: 28rem;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

.text-sm {
  font-size: 0.875rem;
}

.text-lg {
  font-size: 1.125rem;
}

.text-xl {
  font-size: 1.25rem;
}

.text-2xl {
  font-size: 1.5rem;
}

.font-medium {
  font-weight: 500;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.text-gray-500 {
  color: var(--gray-500);
}

.text-gray-600 {
  color: var(--gray-600);
}

.text-gray-700 {
  color: var(--gray-700);
}

.text-gray-900 {
  color: var(--gray-900);
}

.text-primary {
  color: var(--primary);
}

.bg-white {
  background-color: white;
}

.bg-gray-50 {
  background-color: var(--gray-50);
}

.bg-gray-100 {
  background-color: var(--gray-100);
}

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

.shadow-sm {
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

.shadow {
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
}

.rounded {
  border-radius: 0.25rem;
}

.rounded-lg {
  border-radius: 0.5rem;
}

.overflow-hidden {
  overflow: hidden;
}