:root {
  color-scheme: dark;
  --bg-1: #0a0e27;
  --bg-2: #1a1d35;
  --bg-3: #060815;
  --signal: #00d9ff;
  --active: #00ffaa;
  --warn: #fbbf24;
  --text: #e2e8f0;
  --muted: #cbd5e1;
  --border: rgba(56, 189, 248, 0.2);
  --page-bg: radial-gradient(circle at top right, #111c40 0%, var(--bg-1) 45%, var(--bg-3) 100%);
  --nav-bg: rgba(10, 14, 39, 0.85);
  --card-bg-1: rgba(30, 41, 59, 0.8);
  --card-bg-2: rgba(15, 23, 42, 0.8);
  --hero-card-bg: linear-gradient(160deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.65));
  --soft-shadow: 0 14px 30px rgba(8, 47, 73, 0.35);
  --soft-shadow-strong: 0 18px 36px rgba(8, 47, 73, 0.45);
  --road-color: #64748b;
  --car-color: #1d4ed8;
  --wheel-color: #94a3b8;
  --contact-surface: rgba(15, 23, 42, 0.45);
  --contact-surface-hover: rgba(15, 23, 42, 0.78);
  --footer-text: #94a3b8;
  --backdrop-opacity: 0.55;
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg-1: #f0f8ff;
  --bg-2: #d9edff;
  --bg-3: #f8fbff;
  --signal: #0369a1;
  --active: #0f766e;
  --warn: #b45309;
  --text: #0f172a;
  --muted: #334155;
  --border: rgba(14, 116, 144, 0.24);
  --page-bg: radial-gradient(circle at top right, #e7f4ff 0%, var(--bg-1) 46%, var(--bg-3) 100%);
  --nav-bg: rgba(241, 248, 255, 0.84);
  --card-bg-1: rgba(241, 245, 249, 0.86);
  --card-bg-2: rgba(226, 232, 240, 0.78);
  --hero-card-bg: linear-gradient(160deg, rgba(241, 245, 249, 0.95), rgba(219, 234, 254, 0.82));
  --soft-shadow: 0 12px 22px rgba(14, 116, 144, 0.12);
  --soft-shadow-strong: 0 16px 28px rgba(14, 116, 144, 0.2);
  --road-color: #64748b;
  --car-color: #0284c7;
  --wheel-color: #64748b;
  --contact-surface: rgba(226, 232, 240, 0.62);
  --contact-surface-hover: rgba(203, 213, 225, 0.92);
  --footer-text: #475569;
  --backdrop-opacity: 0.35;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--page-bg);
  color: var(--text);
  transition: background 0.35s ease, color 0.35s ease;
}

.app-shell {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
}

.page-content {
  position: relative;
  z-index: 2;
}

.v2x-backdrop {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
  opacity: var(--backdrop-opacity);
}
.v2x-backdrop::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 22%, rgba(0, 217, 255, 0.22), transparent 34%),
    radial-gradient(circle at 76% 64%, rgba(0, 255, 170, 0.18), transparent 36%),
    linear-gradient(rgba(125, 211, 252, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 211, 252, 0.06) 1px, transparent 1px);
  background-size: auto, auto, 42px 42px, 42px 42px;
  animation: gridDrift 24s linear infinite;
}
.v2x-lane {
  position: absolute;
  left: -8%;
  width: 116%;
  height: 1px;
  top: calc(8% + var(--lane) * 18%);
  background: linear-gradient(90deg, transparent, rgba(148, 230, 255, 0.55), transparent);
  transform: rotate(calc(-8deg + var(--lane) * 3deg));
  animation: laneScan calc(6.8s + var(--lane) * 0.8s) ease-in-out infinite;
}
.v2x-packet {
  position: absolute;
  left: -10%;
  top: calc(10% + (var(--p) % 7) * 12%);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: radial-gradient(circle, #c6f6ff 0%, #22d3ee 55%, rgba(34, 211, 238, 0) 70%);
  box-shadow: 0 0 16px rgba(56, 189, 248, 0.55);
  animation:
    packetMove calc(7.2s + (var(--p) % 5) * 1.1s) linear infinite,
    packetBlink 1.6s ease-in-out infinite;
  animation-delay: calc(var(--p) * -0.5s);
}
.v2x-radar {
  position: absolute;
  border: 1px solid rgba(125, 211, 252, 0.24);
  border-radius: 50%;
  animation: radarPulse 5s ease-out infinite;
}
.radar-a {
  width: 320px;
  height: 320px;
  left: -80px;
  bottom: -80px;
}
.radar-b {
  width: 280px;
  height: 280px;
  right: -70px;
  top: 18%;
  animation-delay: 1.8s;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--signal), var(--active));
  z-index: 999;
}

.nav-shell {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.8rem 5vw;
  background: var(--nav-bg);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.logo { color: var(--active); text-decoration: none; font-weight: 800; letter-spacing: 0.08em; }
nav { display: flex; gap: 1rem; flex-wrap: wrap; }
nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  position: relative;
}
nav a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -0.2rem;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), var(--active));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}
nav a:hover, nav a:focus-visible { color: var(--signal); }
nav a:hover::after, nav a:focus-visible::after { transform: scaleX(1); }
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.32rem 0.72rem 0.32rem 0.42rem;
  background: linear-gradient(180deg, #101827, #0b1220);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 0.88rem;
  transition: border-color 0.22s ease, transform 0.22s ease, background 0.22s ease, box-shadow 0.22s ease;
}
.theme-toggle:hover,
.theme-toggle:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(0, 217, 255, 0.4);
  box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.15);
}
:root[data-theme='light'] .theme-toggle {
  background: linear-gradient(180deg, #e2e8f0, #cbd5e1);
}
.signal-pack {
  display: inline-grid;
  grid-template-columns: repeat(3, 0.62rem);
  gap: 0.28rem;
  padding: 0.2rem 0.28rem;
  border-radius: 999px;
  background: rgba(2, 6, 23, 0.55);
}
:root[data-theme='light'] .signal-pack {
  background: rgba(15, 23, 42, 0.24);
}
.signal-dot {
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  opacity: 0.3;
  transition: opacity 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}
.signal-dot.red { background: #ef4444; }
.signal-dot.yellow { background: #f59e0b; }
.signal-dot.green { background: #22c55e; }
.theme-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: inherit;
  letter-spacing: 0.02em;
}
.theme-toggle.is-dark .signal-dot.red,
.theme-toggle.is-light .signal-dot.green {
  opacity: 1;
  transform: scale(1.06);
}
.theme-toggle.is-dark .signal-dot.red {
  box-shadow: 0 0 10px rgba(239, 68, 68, 0.95);
}
.theme-toggle.is-light .signal-dot.green {
  box-shadow: 0 0 10px rgba(34, 197, 94, 0.95);
}
.theme-toggle:hover .signal-dot.yellow {
  opacity: 0.85;
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.8);
}

.hero {
  min-height: 88vh;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2rem;
  align-items: center;
  padding: 5rem 5vw 2rem;
  position: relative;
  overflow: hidden;
}
.kicker { color: var(--signal); letter-spacing: 0.1em; font-size: 0.8rem; }
h1 { font-size: clamp(2rem, 5vw, 4rem); margin: 0.2rem 0 0.3rem; letter-spacing: 0.02em; }
.subtitle { color: var(--muted); font-size: 1.15rem; }
.typing { min-height: 1.8rem; color: var(--active); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.cursor { animation: blink 0.8s steps(1) infinite; }
.cta-row { display: flex; gap: 0.8rem; margin-top: 1.3rem; flex-wrap: wrap; }
.btn {
  padding: 0.75rem 1.2rem;
  border: 1px solid var(--signal);
  color: var(--signal);
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  box-shadow: inset 0 0 0 1px rgba(0, 217, 255, 0.15);
}
.btn:hover, .btn:focus-visible { box-shadow: 0 0 24px rgba(0, 217, 255, 0.25); }
.btn-alt { border-color: var(--active); color: var(--active); }

.hero-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  background: var(--hero-card-bg);
  box-shadow: var(--soft-shadow);
  animation: levitate 5.5s ease-in-out infinite;
}
.hero-card svg { width: 100%; height: auto; display: block; }
.road { stroke: var(--road-color); stroke-width: 4; stroke-dasharray: 10; }
.car { fill: var(--car-color); }
.wheel { fill: var(--wheel-color); }
.signal { stroke: var(--signal); stroke-width: 2; fill: none; animation: pulse 2s infinite; }
.v2v { stroke: var(--active); stroke-width: 2; stroke-dasharray: 6; animation: flow 1.2s linear infinite; }

.network-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
}
.node {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--signal);
  left: calc((var(--i) + 1) * 7.5%);
  top: calc((var(--i) % 6 + 1) * 14%);
  box-shadow: 0 0 20px var(--signal);
  animation: drift calc(4s + var(--i) * 0.4s) infinite alternate ease-in-out;
}

.road-divider {
  margin: 0 auto;
  width: min(1000px, 90vw);
  position: relative;
  height: 36px;
}
.dash {
  position: absolute;
  top: 16px;
  left: 0;
  right: 0;
  border-top: 2px dashed var(--road-color);
}
.moving-car {
  position: absolute;
  top: 0;
  left: 0;
  animation: drive 8s linear infinite;
}

.section { padding: 4rem 5vw; }
.section h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  margin-top: 0;
  position: relative;
  display: inline-block;
}
.section h2::after {
  content: '';
  display: block;
  margin-top: 0.35rem;
  width: 72%;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), transparent);
  animation: headingSweep 3.8s ease-in-out infinite;
}
.grid-2 { display: grid; grid-template-columns: 1.4fr 1fr; gap: 1.5rem; }
.hud-panel,
.publication-card,
.project-card,
.skill-group,
.contact {
  background: linear-gradient(180deg, var(--card-bg-1), var(--card-bg-2));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem;
  position: relative;
  overflow: hidden;
}
.publication-card::before,
.project-card::before,
.skill-group::before,
.contact::before {
  content: '';
  position: absolute;
  inset: -120% auto auto -40%;
  width: 45%;
  height: 300%;
  background: linear-gradient(180deg, transparent, rgba(148, 230, 255, 0.16), transparent);
  transform: rotate(18deg);
  animation: sheen 8s ease-in-out infinite;
  pointer-events: none;
}
.hud-panel h3 { margin-top: 0; color: var(--signal); }
.hud-panel ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 0.4rem; }

.timeline, .project-grid, .skills-grid {
  display: grid;
  gap: 1rem;
}
.timeline { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.project-grid { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.skills-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

.linkedin-embed-shell {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(180deg, var(--card-bg-1), var(--card-bg-2));
  box-shadow: var(--soft-shadow);
}
.linkedin-embed-shell iframe {
  display: block;
  width: 100%;
  border: 0;
}
.embed-note {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.publication-card, .project-card { transition: transform 0.25s ease, box-shadow 0.25s ease; }
.publication-card:hover, .project-card:hover { transform: translateY(-4px); box-shadow: 0 0 28px rgba(0, 217, 255, 0.15); }
.year { color: var(--warn); font-weight: 700; }
.venue { color: var(--signal); }
.links { display: flex; gap: 0.6rem; flex-wrap: wrap; margin-top: 0.5rem; }
.links a { color: var(--active); text-decoration: none; font-weight: 600; font-size: 0.92rem; }

.project-icon { font-size: 1.6rem; margin: 0; }
.badge-row { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0.8rem 0; }
.badge {
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-size: 0.82rem;
  color: var(--muted);
}

.skill-group h3 { margin-top: 0; color: var(--active); }
.skill-group ul { margin: 0; padding-left: 1rem; display: grid; gap: 0.35rem; }

.contact-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}
.contact-link {
  display: grid;
  grid-template-columns: 2rem minmax(88px, auto) 1fr;
  align-items: center;
  gap: 0.7rem;
  padding: 0.6rem 0.7rem;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid rgba(56, 189, 248, 0.2);
  background: var(--contact-surface);
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}
.contact-link:hover,
.contact-link:focus-visible {
  transform: translateX(3px);
  border-color: rgba(0, 217, 255, 0.45);
  background: var(--contact-surface-hover);
}
.contact-icon {
  width: 1.8rem;
  height: 1.8rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(0, 217, 255, 0.14);
  color: var(--signal);
}
.contact-label {
  color: var(--signal);
  font-weight: 700;
}
.contact-value {
  color: var(--muted);
  word-break: break-word;
}

.reveal {
  opacity: 0;
  transform: translateY(26px) scale(0.985);
  filter: blur(6px);
  transition: opacity 0.7s ease, transform 0.7s ease, filter 0.7s ease;
  transition-delay: var(--delay, 0ms);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

footer {
  text-align: center;
  color: var(--footer-text);
  padding: 1.2rem;
  border-top: 1px solid var(--border);
}

@media (max-width: 920px) {
  .hero, .grid-2 { grid-template-columns: 1fr; }
  .hero { padding-top: 3.5rem; }
  .nav-shell { gap: 0.55rem; }
  nav { gap: 0.65rem; }
  .theme-toggle {
    padding: 0.28rem 0.6rem 0.28rem 0.36rem;
    gap: 0.48rem;
  }
  .theme-label {
    font-size: 0.76rem;
  }
  .contact-link {
    grid-template-columns: 2rem 1fr;
    row-gap: 0.2rem;
  }
  .contact-value {
    grid-column: 2;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

@keyframes blink { 50% { opacity: 0; } }
@keyframes pulse {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 1; }
}
@keyframes flow { to { stroke-dashoffset: -24; } }
@keyframes drive { from { left: 0; } to { left: calc(100% - 1.8rem); } }
@keyframes drift { from { transform: translateY(0) scale(1); } to { transform: translateY(-16px) scale(1.15); } }
@keyframes levitate {
  0%, 100% { transform: translateY(0); box-shadow: var(--soft-shadow); }
  50% { transform: translateY(-8px); box-shadow: var(--soft-shadow-strong); }
}
@keyframes sheen {
  0%, 14% { transform: translateX(0) rotate(18deg); opacity: 0; }
  22%, 32% { transform: translateX(260%) rotate(18deg); opacity: 1; }
  45%, 100% { transform: translateX(260%) rotate(18deg); opacity: 0; }
}
@keyframes headingSweep {
  0%, 100% { width: 52%; opacity: 0.75; }
  50% { width: 100%; opacity: 1; }
}
@keyframes gridDrift {
  from { transform: translateY(0); }
  to { transform: translateY(42px); }
}
@keyframes laneScan {
  0%, 100% { opacity: 0.25; }
  50% { opacity: 0.85; }
}
@keyframes packetMove {
  from { transform: translateX(0); }
  to { transform: translateX(120vw); }
}
@keyframes packetBlink {
  0%, 100% { opacity: 0.45; }
  50% { opacity: 1; }
}
@keyframes radarPulse {
  0% { transform: scale(0.82); opacity: 0.1; }
  50% { opacity: 0.48; }
  100% { transform: scale(1.2); opacity: 0; }
}