:root {
  --bg: #0b0e14;
  --bg-alt: #10141d;
  --surface: #151a24;
  --border: #232a38;
  --text: #e8ecf4;
  --text-dim: #9aa5b8;
  --accent: #5eead4;
  --accent-strong: #2dd4bf;
  --font-sans: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;
  --max-width: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

a { color: inherit; }

/* Header / nav */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(11, 14, 20, 0.75);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-dim);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

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

.nav-cta {
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--text) !important;
}

.nav-cta:hover { border-color: var(--accent); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  display: block;
}

/* Hero */

.hero {
  position: relative;
  padding: 140px 0 120px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 600px;
  background: radial-gradient(ellipse at top, rgba(94, 234, 212, 0.16), transparent 60%);
  pointer-events: none;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: pointer;
}

.hero-inner { position: relative; pointer-events: none; }

.hero-inner .btn {
  pointer-events: auto;
}

.eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.8rem;
  font-weight: 500;
  margin: 0 0 16px;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-dim);
  max-width: 560px;
  margin: 0 0 36px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  border: 1px solid transparent;
}

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

.btn-primary {
  background: var(--accent);
  color: #06251f;
}

.btn-primary:hover { background: var(--accent-strong); }

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn-ghost:hover { border-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: clamp(1.8rem, 4vw, 2.4rem);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.about-text {
  color: var(--text-dim);
  font-size: 1.05rem;
  margin: 0;
}

/* Timeline */

.timeline {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.timeline-item {
  border-left: 2px solid var(--border);
  padding-left: 24px;
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -7px;
  top: 4px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}

.timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
}

.timeline-head h3 {
  margin: 0;
  font-size: 1.25rem;
}

.timeline-org {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.timeline-date {
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  margin-left: auto;
}

.timeline-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.education {
  color: var(--text-dim);
  font-size: 0.95rem;
}

.education strong { color: var(--text); }

/* Projects */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 28px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.project-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.project-card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.project-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  border: 1px solid var(--border);
  padding: 3px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.project-card p {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0 0 16px;
}

.project-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.project-link:hover { text-decoration: underline; }

.tag-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 0;
}

.tag-list li {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 6px;
}

/* Skills */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.skill-group h4 {
  margin: 0 0 14px;
  font-size: 0.95rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

/* Contact */

.contact-section { text-align: center; }
.contact-inner { display: flex; flex-direction: column; align-items: center; }
.contact-inner .eyebrow { text-align: center; }
.contact-inner p:not(.eyebrow) { color: var(--text-dim); max-width: 480px; margin: 0 0 32px; }

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.site-footer p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  text-align: center;
}

/* Scroll reveal */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */

@media (max-width: 760px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px;
    gap: 18px;
    display: none;
  }

  .nav-links.is-open { display: flex; }

  .about-grid { grid-template-columns: 1fr; }

  .hero { padding: 110px 0 80px; }

  .section { padding: 72px 0; }

  .timeline-date { margin-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}