/* 通用样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #111827;
}

/* 导航栏 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  z-index: 1000;
}

.navbar-content {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.logo svg {
  width: 32px;
  height: 32px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: bold;
  color: #111827;
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-links a {
  color: #374151;
  text-decoration: none;
  transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
  color: #2563eb;
}

.btn-download-nav {
  background: #2563eb;
  color: white;
  padding: 0.5rem 1.5rem;
  border-radius: 9999px;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.3s;
}

.btn-download-nav:hover {
  background: #1d4ed8;
}

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

/* 通用Section */
section {
  padding: 5rem 0;
}

section h2 {
  font-size: 2.5rem;
  font-weight: bold;
  text-align: center;
  margin-bottom: 1rem;
  color: #111827;
}

section .subtitle {
  text-align: center;
  font-size: 1.25rem;
  color: #4b5563;
  margin-bottom: 4rem;
}

/* 页脚 */
.footer {
  background: #111827;
  color: #9ca3af;
  padding: 3rem 1rem;
}

.footer-content {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer h3 {
  color: white;
  font-weight: 600;
  margin-bottom: 1rem;
}

.footer ul {
  list-style: none;
}

.footer li {
  padding: 0.5rem 0;
}

.footer a {
  color: #9ca3af;
  text-decoration: none;
  transition: color 0.3s;
}

.footer a:hover {
  color: white;
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid #374151;
  font-size: 0.875rem;
}

/* 按钮样式 */
.btn {
  padding: 1rem 2rem;
  border-radius: 9999px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.btn-secondary {
  background: white;
  color: #111827;
  border: 2px solid #e5e7eb;
}

.btn-secondary:hover {
  border-color: #2563eb;
  color: #2563eb;
}

.btn-download {
  background: #2563eb;
  color: white;
  padding: 0.75rem 2rem;
  border-radius: 9999px;
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: background 0.3s;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-download:hover {
  background: #1d4ed8;
}

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

  section h2 {
    font-size: 2rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}