:root {
  --bg: #0b0f0d;
  --bg-alt: #0f1512;
  --surface: #131a17;
  --border: #1f2b26;
  --text: #e8f2ee;
  --dim: #8fa39c;
  --accent: #3ddc84;
  --accent-dim: #2a9d63;
  --mono: 'JetBrains Mono', monospace;
  --sans: 'Inter', sans-serif;
  --max: 900px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(61, 220, 132, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(61, 220, 132, 0.05) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 100%);
}

.container { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

.mono { font-family: var(--mono); }
.accent { color: var(--accent); }
.accent-sm { color: var(--accent); font-size: 0.8rem; letter-spacing: 0.02em; }
.dim { color: var(--dim); }

/* HEADER */
#site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11, 15, 13, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--accent);
  text-decoration: none;
}
.nav-brand .cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  font-family: var(--mono);
  font-size: 0.85rem;
}
.nav-links a {
  color: var(--dim);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-links a:hover { color: var(--accent); }
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text);
  font-size: 1.4rem;
  cursor: pointer;
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
}
.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 8px 0 4px;
}
.hero-role {
  font-size: 1.3rem;
  color: var(--dim);
  margin-bottom: 20px;
}
.hero-desc {
  max-width: 560px;
  color: var(--dim);
  font-size: 1.05rem;
  margin-bottom: 32px;
}
.hero-desc strong { color: var(--text); }
.hero-cta { display: flex; gap: 16px; margin-bottom: 40px; flex-wrap: wrap; }
.hero-meta {
  display: flex;
  gap: 24px;
  font-size: 0.85rem;
  color: var(--dim);
  flex-wrap: wrap;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--accent);
  color: #04140b;
}
.btn-primary:hover { background: var(--accent-dim); }
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* SECTIONS */
.section { padding: 100px 0; }
.section.alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 32px;
  display: flex;
  gap: 10px;
  align-items: baseline;
}
.lead { color: var(--dim); font-size: 1.05rem; max-width: 700px; margin-bottom: 32px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
}
.card h3 { font-size: 1.05rem; margin: 4px 0 8px; }

.edu-grid, .skills-grid, .ach-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.portfolio-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}
.proj-card { display: flex; flex-direction: column; gap: 10px; }
.proj-card h3 { font-size: 1.05rem; margin: 0; }
.proj-card p.dim { font-size: 0.9rem; margin: 0; }
.proj-links { display: flex; gap: 14px; flex-wrap: wrap; margin-top: auto; padding-top: 6px; }
.proj-links a {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--accent-dim);
}
.proj-links a:hover { color: var(--text); border-color: var(--text); }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag {
  font-family: var(--mono);
  font-size: 0.78rem;
  background: rgba(61, 220, 132, 0.1);
  color: var(--accent);
  border: 1px solid rgba(61, 220, 132, 0.25);
  padding: 4px 10px;
  border-radius: 20px;
}
.plain-list { list-style: none; color: var(--dim); font-size: 0.92rem; }
.plain-list li { padding: 4px 0; border-bottom: 1px dashed var(--border); }
.plain-list li:last-child { border-bottom: none; }

/* TIMELINE */
.timeline { position: relative; padding-left: 28px; border-left: 2px solid var(--border); }
.tl-item { position: relative; padding-bottom: 40px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--bg-alt), 0 0 0 5px var(--border);
}
.section:not(.alt) .tl-item::before { box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--border); }
.tl-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.tl-head h3 { font-size: 1.1rem; font-weight: 700; }
.tl-head .dim { font-weight: 400; font-size: 0.95rem; }
.tl-date { font-size: 0.8rem; color: var(--accent); white-space: nowrap; }
.tl-item ul { padding-left: 20px; color: var(--dim); font-size: 0.92rem; }
.tl-item li { margin-bottom: 6px; }

.ach-grid .accent-sm { display: block; margin-bottom: 6px; }

/* CONTACT */
.contact-section { text-align: center; }
.contact-section h2 { justify-content: center; }
.contact-links { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }

/* FOOTER */
#site-footer {
  text-align: center;
  padding: 32px 0;
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
}

/* RESPONSIVE */
@media (max-width: 720px) {
  .nav-links { display: none; }
  .nav-hamburger { display: block; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    right: 24px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    gap: 16px;
  }
  .tl-head { flex-direction: column; }
}