/* 基础样式重置与变量定义 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

:root {
  --primary: #3B82F6;
  --primary-light: #93C5FD;
  --primary-dark: #2563EB;
  --secondary: #10B981;
  --purple: #8B5CF6;
  --dark: #1E293B;
  --light: #F8FAFC;
  --gray: #64748B;
  --gray-light: #E2E8F0;
  --gray-dark: #334155;
  --white: #FFFFFF;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s ease;
}

body {
  background-color: var(--light);
  color: var(--dark);
  line-height: 1.6;
  padding-top: 80px; /* 为固定导航栏预留空间 */
}

/* 通用样式 */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  text-decoration: none;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 16px;
  text-align: center;
  color: var(--dark);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto 40px;
  text-align: center;
}

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  transition: var(--transition);
  text-align: center;
  font-size: 1rem;
}

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

.btn-primary:hover {
  background-color: var(--primary-dark);
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--dark);
  border: 1px solid var(--gray-light);
}

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

/* 导航栏样式 */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(4px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  z-index: 100;
  transition: var(--transition);
  padding: 15px 0;
}

#navbar.scrolled {
  padding: 8px 0;
  box-shadow: var(--shadow);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--dark);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background-color: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.2rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 5px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 8px 15px;
  color: var(--dark);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

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

.nav-link:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--dark);
  padding: 5px;
}

.mobile-menu {
  display: none;
  margin-top: 15px;
  border-top: 1px solid var(--gray-light);
}

.mobile-menu.active {
  display: block;
}

.mobile-nav-menu {
  list-style: none;
}

.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  color: var(--dark);
  transition: var(--transition);
}

.mobile-nav-link:hover {
  background-color: rgba(59, 130, 246, 0.05);
  color: var(--primary);
  padding-left: 10px;
}

/* 英雄区域样式 */
.hero {
  padding: 80px 0 100px;
  text-align: center;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 24px;
  color: var(--dark);
}

.hero-desc {
  font-size: 1.2rem;
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto 32px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.mobile-break {
  display: none;
}

/* 页面卡片区域 */
.page-section {
  padding: 0px 0;
}

.page-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.card {
  background-color: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.card-icon-container {
  height: 100px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-icon {
  font-size: 4rem;
  color: rgba(59, 130, 246, 0.7);
}

.card-content {
  padding: 25px;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--dark);
}

.card-desc {
  color: var(--gray);
  margin-bottom: 10px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary);
  font-weight: 600;
  transition: var(--transition);
}

.card-link:hover {
  color: var(--primary-dark);
}

/* 特性区域 */
.features {
  background-color: #F1F5F9;
  padding: 80px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 40px;
}

.feature-card {
  background-color: var(--white);
  border-radius: 12px;
  padding: 30px;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-icon.blue {
  background-color: rgba(59, 130, 246, 0.1);
  color: var(--primary);
}

.feature-icon.green {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--secondary);
}

.feature-icon.purple {
  background-color: rgba(139, 92, 246, 0.1);
  color: var(--purple);
}

.feature-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--dark);
}

.feature-desc {
  color: var(--gray);
}

/* 页脚样式 */
footer {
  background-color: var(--dark);
  color: var(--white);
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  margin-bottom: 20px;
}

.footer-logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--primary);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
}

.footer-desc {
  color: #94A3B8;
  margin-bottom: 20px;
}

.social-links {
  display: flex;
  gap: 15px;
}

.social-link {
  color: #94A3B8;
  font-size: 1.5rem;
  transition: var(--transition);
}

.social-link:hover {
  color: var(--white);
}

.footer-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-links {
  list-style: none;
}

.footer-link {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #94A3B8;
  margin-bottom: 10px;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--white);
  transform: translateX(5px);
}

.footer-contact {
  list-style: none;
}

.footer-contact li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #94A3B8;
  margin-bottom: 10px;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--gray-dark);
  color: #94A3B8;
  font-size: 0.9rem;
}

/* 响应式样式 */
@media (max-width: 768px) {
  .desktop-nav {
    display: none;
  }

  .page-cards {
    margin-top: 0px;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); /* Adjust for two cards per row on smaller screens */
  }

  .card-title {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.0rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--dark);
  }

  .card-content {
    padding: 15px;
    font-size: 0.8rem;
  }

  .card-icon-container {
    height: 80px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(59, 130, 246, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .card-icon {
    font-size: 3.5rem;
    color: rgba(59, 130, 246, 0.7);
  }

  .menu-toggle {
    display: block;
  }

  .mobile-break {
    display: block;
  }

  .hero {
    padding: 60px 0 80px;
  }

  .hero-title {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
  }

  .hero-desc {
    font-size: 1rem;
  }

  .btn {
    padding: 10px 20px;
    width: 100%;
    max-width: 300px;
  }

  .features {
    padding: 60px 0;
  }

  .page-section {
    padding: 30px 0;
  }
}