:root {
  --bg:         #0d1117;
  --surface:    #161b22;
  --surface2:   #21262d;
  --border:     #30363d;
  --text:       #e6edf3;
  --muted:      #7d8590;
  --accent:     #00d4aa;
  --accent-dim: rgba(0,212,170,0.10);
  --radius:     8px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* NAV */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,17,23,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.nav-brand {
  font-family: 'Share Tech Mono', monospace;
  color: var(--accent);
  font-size: 1rem;
}
.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}
.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--text); text-decoration: none; }

/* SECTIONS */
section {
  padding: 80px 2rem;
  max-width: 900px;
  margin: 0 auto;
}
.section-label {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}
h2 {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--text);
}

/* HERO */
#hero {
  min-height: calc(100vh - 56px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 0;
  padding-bottom: 0;
}
.hero-tag {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.1s forwards;
}
.hero-name {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 600;
  line-height: 1.1;
  margin-bottom: 1rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.25s forwards;
}
.hero-name span { color: var(--accent); }
.hero-sub {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 520px;
  margin-bottom: 2rem;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.4s forwards;
}
.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeUp 0.6s ease 0.55s forwards;
}
.btn-primary {
  padding: 0.65rem 1.5rem;
  background: var(--accent);
  color: #0d1117;
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--radius);
  transition: opacity 0.15s;
}
.btn-primary:hover { opacity: 0.85; text-decoration: none; }
.btn-secondary {
  padding: 0.65rem 1.5rem;
  background: transparent;
  color: var(--text);
  font-weight: 500;
  font-size: 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: border-color 0.15s;
}
.btn-secondary:hover { border-color: var(--accent); text-decoration: none; }
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: none; }
}

/* ABOUT */
#about { border-top: 1px solid var(--border); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}
.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.about-card h3 {
  font-family: 'Share Tech Mono', monospace;
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}
.about-card p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.7;
}
.about-card p + p { margin-top: 0.75rem; }

/* PROJECTS */
#projects { border-top: 1px solid var(--border); }
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.15s, transform 0.15s;
  display: flex;
  flex-direction: column;
}
.project-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.project-tag {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-dim);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 2px 10px;
  display: inline-block;
  margin-bottom: 0.75rem;
  width: fit-content;
}
.project-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.5rem; }
.project-card p { font-size: 0.85rem; color: var(--muted); line-height: 1.6; flex: 1; }
.project-links { display: flex; gap: 1rem; margin-top: 1.25rem; }
.project-links a { font-size: 0.8rem; font-weight: 500; }

/* SKILLS */
#skills { border-top: 1px solid var(--border); }
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}
.skill-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.skill-group h3 {
  font-family: 'Share Tech Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.skill-group ul { list-style: none; }
.skill-group li {
  font-size: 0.85rem;
  color: var(--muted);
  padding: 0.2rem 0;
  border-bottom: 1px solid var(--border);
}
.skill-group li:last-child { border-bottom: none; }

/* CONTACT */
#contact { border-top: 1px solid var(--border); }
.contact-intro {
  font-size: 0.95rem;
  color: var(--muted);
  max-width: 480px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.contact-links { display: flex; gap: 1rem; flex-wrap: wrap; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.65rem 1.25rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  transition: border-color 0.15s, color 0.15s;
}
.contact-link:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

/* FOOTER */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--muted);
  font-family: 'Share Tech Mono', monospace;
}

@media (max-width: 640px) {
  .about-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
}