:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --secondary: #10b981;
  --accent: #8b5cf6;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --border: #e5e7eb;
}

.dark {
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --secondary: #34d399;
  --accent: #a78bfa;
  --text-primary: #f9fafb;
  --text-secondary: #d1d5db;
  --bg-primary: #111827;
  --bg-secondary: #1f2937;
  --border: #374151;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  font-family: 'Noto Sans SC', Tahoma, Arial, Roboto, "Droid Sans", "Helvetica Neue", "Droid Sans Fallback", "Heiti SC", "Hiragino Sans GB", Simsun, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.7;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Noto Serif SC', serif;
  font-weight: 700;
  line-height: 1.3;
}

.hero-section {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="none"/><path d="M0,0 L100,100 M100,0 L0,100" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></svg>');
  opacity: 0.5;
}

.section-title {
  display: inline-block;
  position: relative;
  margin-bottom: 2rem;
}

.section-title::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.5rem;
  width: 50%;
  height: 4px;
  background: var(--accent);
  border-radius: 2px;
}

.card {
  background-color: var(--bg-secondary);
  border-radius: 0.75rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.skill-badge {
  background-color: var(--primary);
  color: white;
  border-radius: 9999px;
  padding: 0.35rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  display: inline-block;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  transition: all 0.2s ease;
}

.skill-badge:hover {
  background-color: var(--primary-dark);
  transform: scale(1.05);
}

.timeline {
  position: relative;
  padding-left: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
  width: 2px;
  background-color: var(--primary);
}

.timeline-item {
  position: relative;
  padding-bottom: 2rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg-primary);
  z-index: 1;
}

.timeline-item:last-child {
  padding-bottom: 0;
}

.project-card {
  border-left: 4px solid var(--primary);
}

.canvas-container {
  position: relative;
  height: 400px;
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  overflow: hidden;
  border-radius: 0.75rem;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

#skill-chart {
  width: 100%;
  height: 300px;
}

@media (max-width: 768px) {
  .timeline {
    padding-left: 1.5rem;
  }
  
  .timeline-item::before {
    left: -1.5rem;
    width: 0.75rem;
    height: 0.75rem;
  }
}

.first-letter {
  font-size: 2.5rem;
  font-weight: 700;
  float: left;
  line-height: 1;
  margin-right: 0.5rem;
  color: var(--primary);
}

.nav-link {
  position: relative;
  padding: 0.5rem 1rem;
  color: var(--text-primary);
  font-weight: 500;
  transition: all 0.2s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 1rem;
  right: 1rem;
  height: 2px;
  background-color: var(--primary);
  transform: scaleX(0);
  transition: transform 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 9999px;
  transition: background-color 0.2s ease;
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
}

.animate-float {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
  100% {
    transform: translateY(0px);
  }
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-fill-color: transparent;
}