:root {
  /* Surfaces */
  --surface: #0b1326;
  --surface-container-lowest: #060e20;
  --surface-container-low: #131b2e;
  --surface-container: #171f33;
  --surface-container-high: #222a3d;
  --surface-container-highest: #2d3449;
  --surface-bright: #31394d;

  /* Foreground */
  --on-surface: #dae2fd;
  --on-surface-variant: #bbc9cf;
  --outline: #859399;
  --outline-variant: #3c494e;

  /* Brand */
  --primary: #a4e6ff;
  --primary-container: #00d1ff;
  --on-primary: #003543;
  --secondary: #4edea3;
  --secondary-container: #00a572;
  --tertiary: #ffd59c;
  --tertiary-container: #feb127;
  --error: #ffb4ab;

  /* Spacing */
  --base: 8px;
  --gutter: 24px;
  --container-max: 1280px;
  --margin-mobile: 16px;
  --margin-desktop: 48px;
  --section-gap: 120px;

  /* Radius */
  --r-sm: 0.125rem;
  --r-md: 0.25rem;
  --r-lg: 0.5rem;
  --r-xl: 0.75rem;
  --r-2xl: 1rem;
  --r-3xl: 1.5rem;
  --r-full: 9999px;

  /* Type */
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-body: "Geist", ui-sans-serif, system-ui, sans-serif;
}


*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  color: var(--on-surface);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--primary-container); color: var(--on-primary); }
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: 0; background: none; color: inherit; }

/* 
   Typography
 */
.headline-xl {
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin: 0 0 16px;
}
.headline-lg {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 32px);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 16px;
}
.headline-md {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
}
.headline-sm {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 4px;
}
.body-lg { font-size: 18px; line-height: 1.6; margin: 0 0 16px; }
.body-md { font-size: 16px; line-height: 1.6; margin: 0 0 12px; }
.body-sm { font-size: 14px; line-height: 1.5; margin: 0; }

.label-mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.05em;
  line-height: 1;
  text-transform: uppercase;
  margin: 0;
}

.muted { color: var(--on-surface-variant); }
.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-tertiary { color: var(--tertiary); }

.text-gradient {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* 
   Layout primitives
    */
main { padding-top: 96px; }

.section {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 80px var(--margin-mobile);
  position: relative;
}
.section--hero {
  padding-top: 40px;
  padding-bottom: 40px;
  min-height: calc(100vh - 96px);
  display: flex;
  align-items: center;
}
@media (min-width: 768px) {
  .section { padding: 96px var(--margin-desktop); }
}

.section-eyebrow {
  color: var(--secondary);
  margin-bottom: 16px;
  display: inline-block;
}
.section-intro { max-width: 640px; margin-bottom: 48px; }

/* 
   Background 
    */
.mesh-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -2;
  background:
    radial-gradient(circle at 15% 20%, rgba(0, 209, 255, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 85% 60%, rgba(78, 222, 163, 0.12) 0%, transparent 50%),
    radial-gradient(circle at 50% 100%, rgba(0, 209, 255, 0.08) 0%, transparent 50%);
}
.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: -1;
}
.glow--primary { background: rgba(0, 209, 255, 0.2); }
.glow--secondary { background: rgba(78, 222, 163, 0.18); }
.glow--top-left { width: 380px; height: 380px; top: -100px; left: -100px; }
.glow--bottom-right { width: 320px; height: 320px; bottom: 0; right: -80px; }

/* 
   Glassmorphism panel
    */
.glass-panel {
  background: rgba(23, 31, 51, 0.55);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--r-xl);
}
.panel { padding: 32px; }

/* 
   Nav
    */
.nav {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 10px 20px;
  background: rgba(11, 19, 38, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--r-full);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  max-width: calc(100vw - 32px);
}
.nav-brand {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--primary);
  white-space: nowrap;
}
.nav-brand-bracket { color: var(--outline); }
.nav-links {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--on-surface-variant);
  padding: 6px 12px;
  border-radius: var(--r-md);
  transition: all 0.2s ease;
}
.nav-link:hover { color: var(--primary); background: rgba(0, 209, 255, 0.08); }
.nav-link--active { color: var(--primary); background: rgba(0, 209, 255, 0.12); }
.nav-icon-btn {
  display: none;
  padding: 8px;
  color: var(--on-surface-variant);
  border-radius: var(--r-md);
  transition: color 0.2s ease;
}
.nav-icon-btn:hover { color: var(--primary); }

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-icon-btn { display: inline-flex; }
  .nav.is-open {
    flex-direction: column;
    border-radius: var(--r-xl);
    padding: 16px;
    align-items: stretch;
  }
  .nav.is-open .nav-links {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
}

/* 
   Buttons
    */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: var(--r-md);
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn .material-symbols-outlined { font-size: 18px; }
.btn--primary {
  background: var(--primary-container);
  color: var(--on-primary);
  box-shadow: 0 0 20px rgba(0, 209, 255, 0.25);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 30px rgba(0, 209, 255, 0.45);
}
.btn--ghost {
  background: transparent;
  color: var(--on-surface);
  border: 1px solid rgba(255, 255, 255, 0.15);
}
.btn--ghost:hover {
  border-color: var(--primary-container);
  color: var(--primary);
  background: rgba(0, 209, 255, 0.05);
}


.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  width: 100%;
  align-items: center;
  position: relative;
}
@media (min-width: 1024px) {
  .hero-grid { grid-template-columns: 7fr 5fr; gap: 64px; }
}
.hero-copy { display: flex; flex-direction: column; gap: 24px; }

.terminal-line { color: var(--secondary); margin-bottom: 8px; }
.terminal-prompt { color: var(--primary); margin-right: 8px; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

.quick-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}
.stat-label { color: var(--outline); }

/* Hero profile card */
.hero-card {
  position: relative;
  padding: 28px;
  border-radius: var(--r-2xl);
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 380px;
  width: 100%;
  justify-self: center;
  transition: transform 0.4s ease;
}
.hero-card:hover { transform: translateY(-6px); }
.hero-card-decor {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 60%);
  border-radius: inherit;
  pointer-events: none;
}
.hero-card-header { display: flex; justify-content: space-between; align-items: flex-start; }
.avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(0, 209, 255, 0.45);
  background: var(--surface-container-high);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.avatar-fallback {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--primary);
  font-size: 18px;
  display: none;
}
.avatar--placeholder .avatar-fallback { display: block; }

.hero-card-links { display: flex; gap: 8px; color: var(--on-surface-variant); }
.hero-card-links a:hover { color: var(--primary); }

.status-row { display: flex; align-items: center; gap: 8px; }
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--secondary-container);
  box-shadow: 0 0 12px rgba(0, 165, 114, 0.8);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
.hero-card-name {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  margin: 0;
  line-height: 1;
}
.hero-card-role { font-size: 11px; }

.terminal-block {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 12px;
  background: var(--surface-container);
  border: 1px solid var(--outline-variant);
  border-radius: var(--r-md);
}
.terminal-block .material-symbols-outlined { color: var(--outline); }
.terminal-block .label-mono { font-size: 11px; }
.terminal-block p { margin: 2px 0; }

.hero-card-bio { font-size: 13px; margin: 0; }

.hero-card-footer {
  display: flex;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--on-surface-variant);
}
.hero-card-footer a:hover { color: var(--primary); }

/* 
   About + Skills
    */
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  margin-top: 48px;
}
@media (min-width: 900px) {
  .about-grid { grid-template-columns: 2fr 1fr; gap: 32px; }
}
.about-main { display: flex; flex-direction: column; gap: 56px; }
.about-sidebar { display: flex; flex-direction: column; gap: 24px; }

.subsection { display: flex; flex-direction: column; gap: 16px; }
.subsection-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 4px;
}
.subsection-header .material-symbols-outlined { font-size: 24px; }

.education-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: border-color 0.2s ease;
}
.education-row:hover { border-color: rgba(0, 209, 255, 0.3); }

.date-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  background: var(--surface-container);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--r-md);
  color: var(--on-surface-variant);
}
.date-pill .material-symbols-outlined { font-size: 14px; }

.interests-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 600px) {
  .interests-grid { grid-template-columns: 1fr 1fr; }
}
.interest-card {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 20px;
}
.interest-tag {
  color: var(--on-surface);
  letter-spacing: 0.1em;
  margin-bottom: 6px;
}

.awards-grid { margin-top: 32px; }
@media (min-width: 1000px) {
  .awards-grid { grid-template-columns: repeat(3, 1fr); }
}

.leadership-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
.leadership-item {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.leadership-item:hover { border-color: rgba(0, 209, 255, 0.3); }
.leadership-meta { color: var(--outline); }

/* Experience + Leadership side by side on wide screens */
.about-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  align-items: start;
}
@media (min-width: 1100px) {
  .about-columns { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* Toolkit */
.toolkit-card { padding: 24px; }
.toolkit-title {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--secondary);
  padding-bottom: 12px;
  margin-bottom: 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.toolkit-title .material-symbols-outlined { font-size: 16px; }
.toolkit-title--secondary { color: var(--tertiary); }
.toolkit-title--tertiary { color: var(--primary); }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tech-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  padding: 6px 10px;
  background: var(--surface-container-high);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--r-md);
  color: var(--on-surface);
}
.tech-tag--primary { color: var(--primary); background: rgba(0, 209, 255, 0.1); }
.tech-tag--secondary { color: var(--secondary); background: rgba(78, 222, 163, 0.1); }
.tech-tag--tertiary { color: var(--tertiary); background: rgba(254, 177, 39, 0.1); }

/* 
   Projects grid
    */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 24px;
}
@media (min-width: 700px) {
  .projects-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1100px) {
  .projects-grid { grid-template-columns: 1fr 1fr 1fr; }
}

.project-card {
  padding: 28px;
  border-radius: var(--r-2xl);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s ease;
}
.project-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 209, 255, 0.4);
}
.project-card-glow {
  position: absolute;
  top: -40px; right: -40px;
  width: 140px; height: 140px;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.3;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.project-card:hover .project-card-glow { opacity: 0.5; }
.project-card--primary .project-card-glow { background: var(--primary-container); }
.project-card--secondary .project-card-glow { background: var(--secondary-container); }
.project-card--tertiary .project-card-glow { background: var(--tertiary-container); }

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.project-icon {
  padding: 10px;
  background: var(--surface-container-high);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--r-lg);
}
.project-icon .material-symbols-outlined { font-size: 24px; }
.project-card--primary .project-icon .material-symbols-outlined { color: var(--primary); }
.project-card--secondary .project-icon .material-symbols-outlined { color: var(--secondary); }
.project-card--tertiary .project-icon .material-symbols-outlined { color: var(--tertiary); }

.project-card-links { display: flex; gap: 8px; color: var(--on-surface-variant); }
.project-card-links a:hover { color: var(--primary); }

.project-title {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  margin: 0;
  line-height: 1.2;
}
.project-description {
  flex-grow: 1;
  font-size: 14px;
  line-height: 1.55;
}

.see-more-row {
  margin-top: 48px;
  display: flex;
  justify-content: center;
}

.btn--sm { padding: 10px 18px; font-size: 12px; }
.btn--sm .material-symbols-outlined { font-size: 16px; }

/*
   GitHub / Open Source section
    */
.gh-subhead { margin-bottom: 16px; }
.gh-subhead--secondary { color: var(--secondary); }
.gh-subhead--tertiary { color: var(--tertiary); }

.gh-featured { max-width: 480px; margin-bottom: 40px; }
.gh-repo { font-size: 11px; }
.gh-cta-row { display: flex; gap: 12px; margin-top: 4px; }

.gh-status { padding: 8px 0 24px; }
.gh-grid { margin-top: 0; }

/* Live PR cards: push status tag + link to the bottom so cards align */
.gh-card-date { font-size: 11px; }
.gh-card-tags { margin-top: auto; padding-top: 16px; }
.gh-card-link { margin-top: 12px; align-self: flex-start; }

/* 
   Contact
    */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: start;
}
@media (min-width: 900px) {
  .contact-grid { grid-template-columns: 5fr 7fr; gap: 64px; }
}

.contact-intro .headline-xl { color: var(--primary); }
.contact-channels {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.contact-channel {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 8px;
  margin-left: -8px;
  border-radius: var(--r-md);
  transition: background 0.2s ease;
}
.contact-channel:hover { background: rgba(255, 255, 255, 0.04); }
.contact-channel .material-symbols-outlined { color: var(--outline); transition: color 0.2s ease; }
.contact-channel:hover .material-symbols-outlined { color: var(--primary); }
.channel-label { color: var(--outline); margin-bottom: 4px; }
.contact-channel .body-md { margin: 0; }

/* Form */
.contact-form {
  padding: 40px;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.contact-form-decor {
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  background: rgba(0, 209, 255, 0.06);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}
.form-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
  z-index: 1;
}
.form-field label { color: var(--outline); }
.form-field input,
.form-field textarea {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--outline-variant);
  padding: 10px 0;
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--on-surface);
  transition: all 0.2s ease;
  width: 100%;
  resize: vertical;
}
.form-field input::placeholder,
.form-field textarea::placeholder { color: var(--outline-variant); }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-bottom-color: var(--primary-container);
  box-shadow: 0 1px 0 var(--primary-container);
}
.form-status {
  margin: 0;
  min-height: 16px;
}
.form-status[data-state="success"] { color: var(--secondary); }
.form-status[data-state="error"] { color: var(--error); }

/* 
   Footer
    */
.site-footer {
  margin-top: 80px;
  padding: 32px 0;
  background: rgba(6, 14, 32, 0.5);
  backdrop-filter: blur(12px);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--margin-mobile);
  display: flex;
  flex-direction: column;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
}
@media (min-width: 768px) {
  .footer-inner { flex-direction: row; padding: 0 var(--margin-desktop); }
}
.footer-links { display: flex; gap: 24px; }
.footer-links a {
  color: var(--on-surface-variant);
  opacity: 0.8;
  transition: all 0.2s ease;
}
.footer-links a:hover {
  color: var(--secondary);
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 
   Reveal animations (used by script.js)
    */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}