:root {
  --color-primary: #0F172A;
  --color-on-primary: #F8FAFC;
  --color-secondary: #475569;
  --color-on-secondary: #FFFFFF;
  --color-accent: #0284C7;
  --color-on-accent: #FFFFFF;
  --color-background: #FAFAFA;
  --color-foreground: #1E293B;
  --color-card: #FFFFFF;
  --color-card-foreground: #1E293B;
  --color-muted: #F1F5F9;
  --color-muted-foreground: #64748B;
  --color-border: #E2E8F0;
  --color-destructive: #DC2626;
  --color-on-destructive: #FFFFFF;
  --color-success: #047857;
  --color-ring: #38BDF8;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, monospace;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  color-scheme: light;
}

body.dark {
  --color-primary: #F8FAFC;
  --color-on-primary: #0F172A;
  --color-secondary: #94A3B8;
  --color-on-secondary: #0F172A;
  --color-accent: #38BDF8;
  --color-on-accent: #0F172A;
  --color-background: #090D16;
  --color-foreground: #E2E8F0;
  --color-card: #0F172A;
  --color-card-foreground: #E2E8F0;
  --color-muted: #1E293B;
  --color-muted-foreground: #94A3B8;
  --color-border: #1E293B;
  --color-destructive: #EF4444;
  --color-success: #34D399;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  background-color: var(--color-background);
  color: var(--color-foreground);
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-body);
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.02em;
  text-wrap: balance;
  margin-bottom: 0.5em;
}

p, li, blockquote { text-wrap: pretty; }

a { color: var(--color-accent); text-decoration: none; transition: color var(--transition-fast); cursor: pointer; }
a:hover { color: var(--color-primary); }

*:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-background), 0 0 0 4px var(--color-ring);
  border-radius: 4px;
}

.container { max-width: 1000px; margin: 0 auto; padding: 0 24px; }
.section { padding: 64px 0; border-bottom: 1px solid var(--color-border); }

.grid-2 { display: grid; grid-template-columns: 1fr; gap: 24px; }
@media (min-width: 768px) { .grid-2 { grid-template-columns: 1fr 1fr; } }
.grid-2 > div { display: flex; }

.badge-group { display: flex; flex-wrap: wrap; gap: 6px; }
.badge {
  display: inline-block; font-family: var(--font-mono); font-size: 0.75rem; font-weight: 500;
  padding: 3px 8px; background-color: var(--color-muted); color: var(--color-secondary);
  border: 1px solid var(--color-border); border-radius: 4px; transition: all var(--transition-fast);
}
.badge:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font-family: var(--font-body); font-size: 0.85rem; font-weight: 500;
  padding: 10px 18px; min-height: 44px; border: 1px solid var(--color-border);
  border-radius: 6px; cursor: pointer; transition: all var(--transition-fast); box-shadow: var(--shadow-sm);
}
.btn-primary { background-color: var(--color-primary); color: var(--color-on-primary); border-color: var(--color-primary); }
.btn-primary:hover { background-color: var(--color-secondary); border-color: var(--color-secondary); box-shadow: var(--shadow-md); }
.btn-secondary { background-color: var(--color-card); color: var(--color-foreground); }
.btn-secondary:hover { background-color: var(--color-muted); border-color: var(--color-muted-foreground); }
.btn-accent { background-color: var(--color-accent); color: var(--color-on-accent); border-color: var(--color-accent); }
.btn-accent:hover { opacity: 0.95; box-shadow: var(--shadow-md); }

.card {
  background-color: var(--color-card); color: var(--color-card-foreground);
  border: 1px solid var(--color-border); border-radius: 8px; padding: 24px;
  box-shadow: var(--shadow-sm); display: flex; flex-direction: column;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
  border-color: var(--color-accent);
}

.navbar {
  background-color: rgba(250, 250, 250, 0.85); backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--color-border);
  position: sticky; top: 0; z-index: 100;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}
body.dark .navbar { background-color: rgba(9, 13, 22, 0.85); }
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-family: var(--font-body); font-weight: 700; font-size: 1.15rem; letter-spacing: -0.03em; color: var(--color-primary); display: flex; align-items: center; gap: 6px; }
.logo span { color: var(--color-accent); }
.nav-links { display: flex; align-items: center; gap: 20px; }

@media (max-width: 640px) {
  body { font-size: 14px; }
  .section { padding: 40px 0; }
  .container { padding: 0 16px; }
  .logo { font-size: 0.95rem; }
  .nav-menu-link { display: none !important; }
  .nav-links { gap: 12px; }
  .nav-item { font-size: 0.8rem; }
  .nav-btn-cv { display: none !important; }
  .badge { font-size: 0.68rem; padding: 2px 6px; }
  .project-meta-item { flex-direction: column; gap: 4px; }
  .meta-label { min-width: auto; }
  h1, h2, h3, h4, h5, h6 { letter-spacing: -0.02em; }
  h1 { font-size: 1.85rem; }
  h2 { font-size: 1.4rem; }
  h3 { font-size: 1.1rem; }
  .about-layout { gap: 24px; }
}
.nav-item {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-weight: 500;
  color: var(--color-muted-foreground);
  font-size: 0.85rem;
  transition: color var(--transition-fast);
}
.nav-item::after {
  content: '';
  position: absolute;
  bottom: 8px;
  left: 0;
  width: 100%;
  height: 1px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
}
.nav-item:hover { color: var(--color-primary); }
.nav-item:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}
.nav-btn-cv { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; min-height: 44px; font-size: 0.8rem; }

.loadmore-btn { display: inline-flex; margin-inline: auto; margin-top: 24px; }
[data-loadmore-item][hidden],
[data-loadmore-btn][hidden] { display: none !important; }

#content article > * + * { margin-top: 1em; }
#content h2 { font-size: 1.5rem; margin-top: 1.5em; }
#content h3 { font-size: 1.2rem; margin-top: 1.2em; }
#content ul, #content ol { padding-left: 1.5em; }
#content pre { background-color: var(--color-muted); border: 1px solid var(--color-border); border-radius: 8px; padding: 16px; overflow-x: auto; font-family: var(--font-mono); font-size: 0.85rem; }
#content code { font-family: var(--font-mono); font-size: 0.85rem; background-color: var(--color-muted); padding: 2px 4px; border-radius: 4px; }
#content pre code { background: none; padding: 0; }
#content blockquote { border-left: 4px solid var(--color-accent); padding-left: 16px; color: var(--color-muted-foreground); }

/* Scroll Reveal Animations */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1), transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Load More Fade In */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
}