:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #21262d;
  --border: #30363d;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --text: #e6edf3;
  --muted: #8b949e;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --radius: 8px;
  --max-w: 900px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* NAV */
nav {
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  background: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(8px);
  z-index: 100;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-brand {
  font-family: var(--mono);
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
}

.nav-brand span { color: var(--accent); }

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

.nav-links a {
  color: var(--muted);
  font-size: 0.9rem;
  transition: color 0.15s;
}

.nav-links a:hover,
.nav-links a.active { color: var(--text); text-decoration: none; }

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

/* MAIN */
main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem 2rem;
  width: 100%;
}

/* HERO */
.hero {
  padding: 4rem 0 3rem;
}

.hero-label {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero h2 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 400;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.hero p {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 600px;
  margin-bottom: 2rem;
}

.btn-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.15s;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #0d1117;
  border: 1px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #0d1117;
  text-decoration: none;
}

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

.btn-secondary:hover {
  border-color: var(--muted);
  text-decoration: none;
  background: var(--surface-2);
}

/* SECTION */
.section { margin-top: 4rem; }

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text);
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* SKILLS */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
}

.skill-tag {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 1rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

/* PROJECTS GRID */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: border-color 0.15s, transform 0.15s;
}

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

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
}

.project-card h3 a { color: var(--text); }
.project-card h3 a:hover { color: var(--accent); text-decoration: none; }

.project-card p {
  font-size: 0.875rem;
  color: var(--muted);
  flex: 1;
}

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

.tag {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.15rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
}

.project-links {
  display: flex;
  gap: 1rem;
  font-size: 0.8rem;
}

/* RESUME PAGE */
.resume-actions {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
  flex-wrap: wrap;
}

.resume-section { margin-bottom: 2.5rem; }

.resume-section h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
  font-family: var(--mono);
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.resume-entry {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 0.75rem;
}

.resume-entry-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.resume-entry h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

.resume-entry .meta {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--mono);
}

.resume-entry ul {
  margin-top: 0.5rem;
  padding-left: 1.25rem;
}

.resume-entry li {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

/* CONTACT */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.contact-info p {
  color: var(--muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

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

.contact-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s, color 0.15s;
}

.contact-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}

.contact-form { display: flex; flex-direction: column; gap: 1rem; }

.form-group { display: flex; flex-direction: column; gap: 0.4rem; }

.form-group label {
  font-size: 0.8rem;
  color: var(--muted);
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input,
.form-group textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9rem;
  transition: border-color 0.15s;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.form-group textarea { min-height: 140px; }

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

/* PAGE HEADER */
.page-header { margin-bottom: 3rem; }
.page-header h1 { font-size: 2rem; font-weight: 700; margin-bottom: 0.5rem; }
.page-header p { color: var(--muted); font-size: 0.95rem; }

/* RESPONSIVE */
@media (max-width: 640px) {
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .nav-links { gap: 1.25rem; }
  main { padding: 2.5rem 1.25rem; }
}