:root {
  --bg: #0a0e14;
  --bg-alt: #0d1220;
  --surface: #111827;
  --surface-border: #1f2937;
  --text: #e5e7eb;
  --text-dim: #94a3b8;
  --accent: #22d3ee;
  --accent-2: #818cf8;
  --mono: "JetBrains Mono", "Fira Code", Consolas, "Courier New", monospace;
  --sans: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  --max-width: 960px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #06222a;
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

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

h1, h2, h3 { font-weight: 700; line-height: 1.2; margin: 0 0 0.5em; }

/* Nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--surface-border);
}
.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--accent);
  font-size: 1.1rem;
}
.nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  margin: 0;
  padding: 0;
}
.nav a {
  color: var(--text-dim);
  font-size: 0.95rem;
}
.nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero {
  position: relative;
  padding: 6rem 1.5rem 5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(34, 211, 238, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 211, 238, 0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse at top, black 40%, transparent 75%);
  pointer-events: none;
}
.hero-content { position: relative; }
.eyebrow {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.25rem);
  margin-bottom: 1.25rem;
}
.hero .accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lead {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 640px;
}
.hero-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
}
.btn:hover { text-decoration: none; }
.btn-primary {
  background: var(--accent);
  color: #06222a;
}
.btn-primary:hover { background: #67e8f9; }
.btn-ghost {
  color: var(--text);
  border-color: var(--surface-border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* Sections */
.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4.5rem 1.5rem;
}
.section-alt { background: var(--bg-alt); }
.section h2 {
  font-size: 1.75rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.section-index {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 1rem;
  opacity: 0.7;
}

.about-grid p {
  color: var(--text-dim);
  max-width: 720px;
}
.about-grid p + p { margin-top: 1rem; }

/* Skills */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  padding: 1.5rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.skill-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.skill-card h3 { font-size: 1.05rem; color: var(--text); }
.skill-card p { color: var(--text-dim); font-size: 0.92rem; margin: 0; }

/* Projects */
.project-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: 10px;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}
.project-card.featured { border-color: var(--accent-2); }
.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.project-header h3 { margin: 0; }
.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent-2);
  background: rgba(129, 140, 248, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}
.project-card p { color: var(--text-dim); }
.project-features {
  color: var(--text-dim);
  padding-left: 1.25rem;
  margin: 1rem 0;
}
.project-features li { margin-bottom: 0.4rem; }
.project-note {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--text-dim);
  margin: 0;
}

/* Timeline */
.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  position: relative;
}
.timeline-item {
  position: relative;
  padding: 0 0 2rem 2rem;
  border-left: 2px solid var(--surface-border);
}
.timeline-item:last-child { border-color: transparent; padding-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}
.timeline-content h3 { font-size: 1.1rem; margin-bottom: 0.25rem; }
.timeline-meta {
  color: var(--text-dim);
  font-family: var(--mono);
  font-size: 0.85rem;
  margin: 0;
}

/* Contact */
.contact-section { text-align: left; }
.contact-links { margin-top: 1.5rem; }

/* Footer */
.footer {
  text-align: center;
  padding: 2rem 1.5rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--surface-border);
}

@media (max-width: 640px) {
  .nav ul { gap: 1rem; }
  .nav ul li:nth-child(n+4) { display: none; }
}