:root {
  --bg: #fafaf8;
  --text: #1a1a1a;
  --muted: #666;
  --border: #e5e5e5;
  --accent: #1a1a1a;
  --tag-bg: #f0f0ee;
  --card-bg: #ffffff;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  line-height: 1.7;
}

nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: rgba(250,250,248,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.logo { font-weight: 700; font-size: 1rem; letter-spacing: -0.02em; }

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

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

nav a:hover { color: var(--text); }

section {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

h2 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

p { color: var(--muted); margin-bottom: 1rem; }
p strong { color: var(--text); }

.divider {
  max-width: 720px;
  margin: 0 auto;
  height: 1px;
  background: var(--border);
}

#hero { padding-top: 6rem; padding-bottom: 5rem; }

.hero-sub {
  font-family: 'DM Mono', monospace;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}

#hero h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin-bottom: 1rem;
}

.hero-desc { font-size: 1.05rem; color: var(--muted); margin-bottom: 2rem; }

.hero-btns { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  background: var(--text);
  color: var(--bg);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  transition: opacity 0.2s, transform 0.2s;
}

.btn:hover { opacity: 0.85; transform: translateY(-1px); }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover { background: var(--tag-bg); opacity: 1; }

.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }

.skill-group h3 {
  font-size: 0.8rem;
  font-family: 'DM Mono', monospace;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tags span {
  background: var(--tag-bg);
  color: var(--text);
  padding: 0.3rem 0.7rem;
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 500;
}

.projects-list { display: flex; flex-direction: column; gap: 1.5rem; }

.project {
  padding: 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-bg);
  transition: border-color 0.2s, transform 0.2s;
}

.project:hover { border-color: var(--text); transform: translateY(-2px); }

.project-header {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.project-header h3 { font-size: 1.05rem; font-weight: 700; }
.project p { margin: 0; font-size: 0.92rem; }

.wip {
  font-size: 0.7rem;
  font-family: 'DM Mono', monospace;
  background: #fff3cd;
  color: #856404;
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-weight: 400;
}

.edu-list { display: flex; flex-direction: column; gap: 1.5rem; }

.edu-item { display: flex; gap: 1.5rem; align-items: flex-start; }

.edu-year {
  font-family: 'DM Mono', monospace;
  font-size: 0.75rem;
  color: var(--muted);
  white-space: nowrap;
  padding-top: 0.2rem;
  min-width: 100px;
}

.edu-item h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.25rem; }
.edu-item p { font-size: 0.88rem; color: var(--muted); margin: 0; }

.contact-links { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 1.5rem; }

.contact-links a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--card-bg);
  transition: border-color 0.2s, transform 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.contact-links a:hover { border-color: var(--text); transform: translateX(4px); }

footer {
  text-align: center;
  padding: 2rem;
  border-top: 1px solid var(--border);
  font-size: 0.82rem;
  color: var(--muted);
  font-family: 'DM Mono', monospace;
}

.fade-in { opacity: 0; transform: translateY(16px); transition: opacity 0.5s, transform 0.5s; }
.fade-in.visible { opacity: 1; transform: translateY(0); }

@media (max-width: 600px) {
  nav ul { gap: 1rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .edu-item { flex-direction: column; gap: 0.25rem; }
  .edu-year { min-width: unset; }
}