/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #0f0f1a;
  color: #333;
  line-height: 1.6;
  overflow-x: hidden;
}

/* 粒子背景画布 */
#particle-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}
nav.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  z-index: 1000;
}
.nav-brand {
  font-weight: bold;
  font-size: 1.2rem;
  color: #fff;
}
.nav-menu {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}
.nav-menu a {
  text-decoration: none;
  color: #e0e0e0;
  font-weight: 500;
  transition: color 0.3s;
}
.nav-menu a:hover {
  color: #667eea;
}
main {
  margin-top: 70px;
  padding: 2rem;
  position: relative;
  z-index: 1;
  color: rgba(255, 255, 255, 0.85);
}
main a {
  color: #82b1ff;
}
.page {
  display: none;
  animation: fadeIn 0.6s ease-in-out;
}
.page.active {
  display: block;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.hero {
  text-align: center;
  padding: 4rem 1rem;
  background: linear-gradient(135deg, rgba(102,126,234,0.85), rgba(118,75,162,0.85));
  color: #fff;
  border-radius: 12px;
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}
.hero p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}
.hero button {
  padding: 0.75rem 2rem;
  background: #fff;
  color: #667eea;
  border: none;
  border-radius: 24px;
  font-size: 1rem;
  cursor: pointer;
  transition: transform 0.3s;
}
.hero button:hover {
  transform: scale(1.05);
}
section h2 {
  margin-bottom: 1rem;
  border-left: 4px solid #667eea;
  padding-left: 0.5rem;
  color: #fff;
}
.skills-grid, .projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}
.skill-card, .project-card {
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.15);
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  cursor: pointer;
}
.skill-card:hover, .project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(255, 255, 255, 0.35);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}
.project-card img {
  max-width: 100%;
  border-radius: 8px;
  margin-bottom: 0.5rem;
}
.project-card h3, .skill-card strong {
  color: #fff;
}
.project-card p, .skill-card p {
  color: rgba(255, 255, 255, 0.75);
}
.project-link {
  font-size: 0.8rem;
  margin-left: 1rem;
  color: #82b1ff;
  text-decoration: underline;
}
.project-link:hover {
  color: #b388ff;
}
/* 响应式 */
@media (max-width: 600px) {
  .nav-menu {
    flex-direction: column;
    gap: 0.5rem;
    background: #fff;
    position: absolute;
    top: 60px; right: 0; left: 0;
    display: none;
  }
  .navbar.open .nav-menu {
    display: flex;
  }
  .hero h1 {
    font-size: 2rem;
  }
  main {
    padding: 1rem;
  }
}