:root {
  --bg: #0b0d10;
  --bg-alt: #12151a;
  --surface: #161a20;
  --border: #232830;
  --text: #e6e9ee;
  --text-dim: #9aa4b2;
  --accent: #4fd1c5;
  --accent-2: #7c9dff;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --max: 880px;
}

* { 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;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--text);
  font-size: 1.05rem;
}
.logo .accent { color: var(--accent); }

.links { display: flex; gap: 1.25rem; }
.links a { color: var(--text-dim); font-size: 0.9rem; }
.links a:hover { color: var(--text); }

main { max-width: var(--max); margin: 0 auto; padding: 0 1.5rem; }

.hero {
  padding: 6rem 0 4rem;
}

.eyebrow {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.9rem;
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 1rem;
}

.wave { display: inline-block; animation: wave 2.2s ease-in-out infinite; }
@keyframes wave {
  0%, 60%, 100% { transform: rotate(0deg); }
  10%, 30% { transform: rotate(14deg); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(-4deg); }
  50% { transform: rotate(10deg); }
}

.lead {
  color: var(--text-dim);
  font-size: 1.05rem;
  max-width: 640px;
}

.cta { display: flex; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; }

.btn {
  font-family: var(--mono);
  font-size: 0.9rem;
  padding: 0.75rem 1.25rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  transition: all 0.15s ease;
}
.btn-primary { background: var(--accent); color: #05201d; border-color: var(--accent); }
.btn-primary:hover { background: #6ee0d5; color: #05201d; }
.btn-ghost { color: var(--text); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.section { padding: 3.5rem 0; border-top: 1px solid var(--border); }

.section h2 {
  font-size: 1.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tag { font-family: var(--mono); color: var(--accent); font-size: 1.1rem; }

.sub { color: var(--text-dim); margin-top: -1rem; margin-bottom: 1.5rem; }

.stack-grid, .project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.stack-card, .project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
}

.stack-card h3 { margin-top: 0; font-size: 1rem; color: var(--accent-2); }
.stack-card ul { margin: 0; padding-left: 1.1rem; color: var(--text-dim); font-size: 0.92rem; }
.stack-card li { margin-bottom: 0.4rem; }

.project-card {
  display: block;
  color: var(--text);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.project-card:hover { border-color: var(--accent); transform: translateY(-2px); color: var(--text); }
.project-card h3 { margin-top: 0; font-size: 1.05rem; color: var(--accent-2); }
.project-card p { color: var(--text-dim); font-size: 0.92rem; margin-bottom: 0.75rem; }
.project-card .focus { font-family: var(--mono); font-size: 0.78rem; color: var(--accent); }

.cert-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.6rem; }
.cert-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 0.92rem;
}

.contact-links { display: flex; gap: 1.5rem; flex-wrap: wrap; margin-top: 1rem; }
.contact-links a { font-family: var(--mono); font-size: 0.95rem; }

.footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid var(--border);
}