/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', sans-serif;
  color: #000;
  background-color: #f9f9f9;
  line-height: 2;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
}

/* Navigation */
.navbar {
  background-color: #000;
  color: white;
  padding: 1.2rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.4rem;
  font-weight: 600;
  color: white;
  text-decoration: none;
  letter-spacing: 0.5px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2.5rem;
}

.nav-menu a {
  color: white;
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-menu a:hover {
  color: #ccc;
}

.lang-switch {
  font-weight: 600;
}

/* Hero Section */
.hero {
  background: url('images/hero-bg.jpg') center/cover no-repeat;
  height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: white;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 1.5rem;
}

.hero h1 {
  font-size: 3.2rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  line-height: 1.6;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.cta-buttons {
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 0.8rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 2px;
  transition: all 0.3s;
}

.btn-primary {
  background-color: #000;
  color: white;
}

.btn-primary:hover {
  background-color: #333;
}

.btn-outline {
  background: transparent;
  color: white;
  border: 1px solid white;
}

.btn-outline:hover {
  background: white;
  color: #000;
}

/* Categories */
.categories {
  padding: 5rem 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2.5rem;
  background: white;
}

.category-card {
  padding: 2.5rem;
  border: 1px solid #eee;
  transition: transform 0.3s;
}

.category-card:hover {
  transform: translateY(-5px);
}

.category-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.category-card p {
  color: #555;
  margin-bottom: 1.2rem;
}

.link-arrow {
  color: #000;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
}

.link-arrow:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  background: #000;
  color: white;
  padding: 1.5rem 0;
  text-align: center;
}
/* 新增：增加主内容区段落间距 */
main p {
  margin-bottom: 1.5rem;
  line-height: 1.8;
}