:root {
  --bg: #0a0e14;
  --surface: #121820;
  --surface-hover: #18202a;
  --border: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --accent: #7dd3fc;
  --accent-dim: rgba(125, 211, 252, 0.1);
  --accent-violet: #a78bfa;
  --max-width: 1080px;
  --content-width: 720px;
  --radius: 12px;
  --spring: cubic-bezier(0.22, 1, 0.36, 1);
  --transition: 0.4s var(--spring);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", sans-serif;
  background-color: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: var(--accent-dim);
  color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

img, svg { display: block; }

.container {
  width: 90%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.container-narrow {
  max-width: var(--content-width);
  margin: 0 auto;
}

/* Skip to content */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 1rem;
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 1000;
  transition: top 0.2s;
  text-decoration: none;
}
.skip-link:focus { top: 0; }

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  transition: transform 0.4s var(--spring), background 0.4s ease, box-shadow 0.4s ease;
  transform: translateY(0);
}
.nav-hidden { transform: translateY(-100%); }
.nav-scrolled {
  background: rgba(10, 14, 20, 0.8);
  backdrop-filter: blur(16px) saturate(1.8);
  -webkit-backdrop-filter: blur(16px) saturate(1.8);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.nav-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
  opacity: 0.6;
  transition: opacity var(--transition);
}
.nav-logo:hover { opacity: 1; }
.nav-links { display: flex; gap: 2rem; }
.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--text-primary); }
.nav-link.active { color: var(--accent); }
.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 6rem 1.5rem;
}
#particles-canvas {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 0;
}
.hero-monogram {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(12rem, 30vw, 28rem);
  font-weight: 900;
  color: var(--text-primary);
  opacity: 0.025;
  letter-spacing: -0.06em;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}
.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: var(--content-width);
}
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}
.tagline {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.02em;
  margin-bottom: 2.5rem;
  min-height: 1.6em;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.15em;
}
.tagline-word {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--spring), transform 0.6s var(--spring);
}
.tagline.loaded .tagline-word { opacity: 1; transform: translateY(0); }
.tagline-sep {
  color: var(--text-tertiary);
  margin: 0 0.1em;
}
.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s var(--spring) 0.5s, transform 0.6s var(--spring) 0.5s;
}
.hero.loaded .hero-actions { opacity: 1; transform: translateY(0); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  font-family: inherit;
  letter-spacing: 0.01em;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
}
.btn-primary:hover {
  background: #9ad9fb;
  transform: scale(1.03);
}
.btn-secondary {
  background: transparent;
  color: var(--accent-violet);
  border: 1.5px solid var(--accent-violet);
}
.btn-secondary:hover {
  background: rgba(167, 139, 250, 0.1);
  transform: scale(1.03);
}

/* Sections */
section { padding: 6rem 0; }
section:nth-child(even) { background-color: var(--surface); }

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}
.section-subtitle {
  color: var(--text-tertiary);
  font-size: 1rem;
  font-weight: 400;
  margin-bottom: 3rem;
  max-width: 540px;
}

.section-header {
  margin-bottom: 3rem;
}
.section-header h2 {
  margin-bottom: 0.5rem;
}
.section-header .section-subtitle {
  margin-bottom: 0;
}

/* About */
.about-text {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}
.about-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.about-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.about-meta-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
}
.about-meta-value {
  font-size: 1rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* Work Timeline */
.timeline {
  position: relative;
  padding-left: 2rem;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 1px;
  background: var(--border);
}
.timeline-item {
  position: relative;
  padding-bottom: 2.5rem;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  transform: translateX(-50%);
}
.timeline-item:nth-child(2) .timeline-dot {
  background: var(--accent-violet);
}
.timeline-org {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}
.timeline-role {
  font-size: 0.9375rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 0.75rem;
}
.timeline-desc {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* Skills */
.skills-section {
  margin-top: 3rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}
.skills-section h3 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}
.skill-group {
  margin-bottom: 1.75rem;
}
.skill-group:last-child { margin-bottom: 0; }
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.skill-tag {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 100px;
  transition: all var(--transition);
}
.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}

/* Projects */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.project-card {
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}
.project-card:hover {
  background: var(--surface);
  border-color: var(--accent);
  transform: scale(1.02);
  box-shadow: 0 20px 40px -12px rgba(0,0,0,0.4);
}
.project-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
  opacity: 0.5;
  transition: opacity var(--transition);
}
.project-card:hover .project-icon { opacity: 0.8; }
.project-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}
.project-card p {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
  margin-bottom: 1.25rem;
}
.project-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
  transition: gap var(--transition);
  margin-top: auto;
}
.project-link:hover { gap: 0.6rem; }

/* Musings */
.musings-text {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

/* Connect */
.connect-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}
.connect-link {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition);
}
.connect-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  transform: translateY(-2px);
}
.connect-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  flex-shrink: 0;
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 1.5rem 2rem;
  border-top: 1px solid var(--border);
}
.footer-copyright {
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}
.back-to-top {
  display: inline-block;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition);
}
.back-to-top:hover { color: var(--accent); }

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--spring), transform 0.7s var(--spring);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links { gap: 1.25rem; }
  .nav-link { font-size: 0.8125rem; }
  section { padding: 4rem 0; }
  .projects-grid { grid-template-columns: 1fr; }
  .about-meta { flex-direction: column; gap: 1rem; }
  .hero-actions { flex-direction: column; }
  .hero { min-height: 90vh; }
}

@media (max-width: 480px) {
  .nav-links { gap: 1rem; }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
  .tagline-word { opacity: 1; transform: none; }
  .hero-actions { opacity: 1; transform: none; }
  .project-card:hover { transform: none; }
  .btn-primary:hover, .btn-secondary:hover { transform: none; }
  #particles-canvas { display: none; }
  .nav-hidden { transform: translateY(0); }
}