:root {
  --bg-primary: #0F172A;
  --bg-secondary: #1E293B;
  --bg-card: #1E293B;
  --text-primary: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent: #38BDF8;
  --accent-hover: #7DD3FC;
  --border: #334155;
  --border-light: #475569;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
}

header {
  background: rgba(15,23,42,0.9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 100;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 5%;
  max-width: 1200px;
  margin: auto;
}

.logo {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.9rem;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--accent);
}

.hero {
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  color: var(--text-primary);
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 0.75rem;
  font-weight: 700;
  letter-spacing: -1px;
}

.highlight {
  color: var(--accent);
}

.hero p {
  font-size: 1.15rem;
  margin-bottom: 2rem;
  color: var(--text-secondary);
  font-weight: 400;
}

.btn {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: var(--accent);
  color: var(--bg-primary);
  text-decoration: none;
  border-radius: 6px;
  font-weight: 700;
  font-size: 0.9rem;
  transition: background 0.2s, transform 0.2s;
}

.btn:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.section {
  padding: 5rem 5%;
  max-width: 1100px;
  margin: auto;
  text-align: center;
}

.section h2 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-weight: 700;
  letter-spacing: -0.5px;
}

.section h2::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--accent);
  margin: 0.75rem auto 0;
  border-radius: 2px;
}

.about-content {
  max-width: 600px;
  margin: 2rem auto 0;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.education-timeline {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.edu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.75rem;
  display: flex;
  gap: 1.25rem;
  text-align: left;
  max-width: 560px;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.edu-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(56,189,248,0.1);
}

.edu-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: rgba(56,189,248,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.edu-body h3 {
  font-size: 1.05rem;
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.edu-school {
  display: block;
  color: var(--accent);
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 0.15rem;
}

.edu-year {
  display: inline-block;
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.edu-body p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.project-card {
  background: var(--bg-card);
  padding: 1.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  transition: border-color 0.2s, box-shadow 0.2s;
  text-align: left;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(56,189,248,0.1);
}

.project-card h3 {
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  flex: 1;
  font-size: 0.9rem;
  line-height: 1.6;
}

.project-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  font-size: 0.8rem;
}

.lang {
  background: rgba(56,189,248,0.1);
  color: var(--accent);
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  font-weight: 500;
}

.stars {
  color: #fbbf24;
  padding: 0.2rem 0.65rem;
  background: rgba(251,191,36,0.1);
  border-radius: 4px;
  font-weight: 500;
}

.fork {
  background: rgba(74,222,128,0.1);
  color: #4ade80;
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  font-weight: 500;
}

.loading, .error {
  color: var(--text-muted);
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
}

.project-links {
  display: flex;
  gap: 1rem;
}

.project-links a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.85rem;
  transition: color 0.2s;
}

.project-links a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
  margin-top: 2.5rem;
}

.skill {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  padding: 0.45rem 1.15rem;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.skill:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(56,189,248,0.05);
}

#contact p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  margin-top: 1rem;
}

footer {
  text-align: center;
  padding: 2.5rem 5%;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.85rem;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 2rem; }
  .nav-links { gap: 1rem; }
  .nav-links a { font-size: 0.8rem; }
}