:root {
  --bg: #05070d;
  --bg-2: #0a0f1a;
  --line: rgba(140, 180, 220, 0.16);
  --text: #dbe4f0;
  --muted: #93a3ba;
  --accent: #3fd8e0;
  --accent-2: #8b7cf0;
  --max: 1100px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 100;
  background: var(--bg-2);
  padding: 0.6rem 1rem;
  border: 1px solid var(--accent);
  border-radius: 6px;
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.85rem 1.5rem;
  background: rgba(5, 7, 13, 0.82);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand img {
  display: block;
  width: auto;
  height: 40px;
}

.nav {
  display: flex;
  gap: 1.75rem;
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav a {
  color: var(--muted);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.nav a:hover {
  color: var(--text);
  text-decoration: none;
  border-bottom-color: var(--accent);
}

/* ---------- hero ---------- */

.hero {
  max-width: var(--max);
  margin: 0 auto;
  padding: 6.5rem 1.5rem 5rem;
  position: relative;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 620px;
  background:
    radial-gradient(45% 55% at 22% 28%, rgba(63, 216, 224, 0.16), transparent 65%),
    radial-gradient(40% 50% at 78% 20%, rgba(139, 124, 240, 0.14), transparent 68%);
  pointer-events: none;
  z-index: -1;
}

.eyebrow {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: 0.75rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.1rem;
}

.hero h1 {
  font-size: clamp(2.4rem, 6.2vw, 4.3rem);
  line-height: 1.06;
  letter-spacing: -0.025em;
  margin: 0 0 1.6rem;
  font-weight: 700;
}

.lede {
  font-size: clamp(1.05rem, 1.9vw, 1.22rem);
  color: var(--muted);
  max-width: 62ch;
  margin: 0 0 2.4rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 3.5rem;
}

.btn {
  display: inline-block;
  padding: 0.72rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.94rem;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}
.btn:hover {
  text-decoration: none;
  border-color: var(--accent);
  transform: translateY(-1px);
}
.btn-primary {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: #04070d;
  font-weight: 600;
}
.btn-primary:hover { filter: brightness(1.08); }

.pillars {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 2rem;
  padding: 1.6rem 0 0;
  margin: 0;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
  color: var(--muted);
}
.pillars li { display: flex; align-items: center; gap: 0.55rem; }

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

/* ---------- sections ---------- */

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 5rem 1.5rem;
  border-top: 1px solid var(--line);
}

.section h2 {
  font-size: clamp(1.75rem, 3.6vw, 2.5rem);
  letter-spacing: -0.02em;
  margin: 0 0 1.5rem;
  font-weight: 650;
}

.section-intro {
  color: var(--muted);
  max-width: 60ch;
  margin: -0.6rem 0 2.75rem;
}

.prose p {
  max-width: 70ch;
  color: var(--muted);
  margin: 0 0 1.25rem;
}
.prose em { color: var(--text); font-style: italic; }

/* ---------- research areas ---------- */

.area-grid {
  margin-top: 3rem;
  display: grid;
  gap: 1.15rem;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.area {
  padding: 1.5rem 1.4rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.035), rgba(255, 255, 255, 0));
  position: relative;
  overflow: hidden;
}
.area::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.area h3 {
  margin: 0 0 0.6rem;
  font-size: 1.06rem;
  letter-spacing: 0.01em;
}
.area p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---------- project cards ---------- */

.cards {
  display: grid;
  gap: 1.15rem;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
}

.card {
  display: flex;
  flex-direction: column;
  padding: 1.7rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--bg-2);
  transition: transform 0.22s, border-color 0.22s, box-shadow 0.22s;
}
.card:hover {
  transform: translateY(-3px);
  border-color: rgba(63, 216, 224, 0.45);
  box-shadow: 0 14px 40px -18px rgba(63, 216, 224, 0.5);
}

.tag {
  font-family: ui-monospace, "Cascadia Mono", Consolas, "SF Mono", Menlo, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.85rem;
}

.card h3 {
  margin: 0;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}

.sub {
  margin: 0.3rem 0 0.9rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.card > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
}
.card em { color: var(--text); }

/* ---------- closing + footer ---------- */

.closing p:last-child {
  color: var(--muted);
  max-width: 60ch;
  margin: 0;
}

.footer {
  border-top: 1px solid var(--line);
  padding: 2.75rem 1.5rem 3.25rem;
  text-align: center;
  color: var(--muted);
  font-size: 0.88rem;
}
.footer img {
  height: 34px;
  width: auto;
  opacity: 0.7;
  margin-bottom: 0.75rem;
}
.footer p { margin: 0; }

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  .topbar { padding: 0.7rem 1rem; }
  .brand img { height: 32px; }
  .nav { gap: 1.1rem; font-size: 0.78rem; }
  .hero { padding: 4rem 1.1rem 3.5rem; }
  .section { padding: 3.5rem 1.1rem; }
  .pillars { gap: 0.5rem 1.1rem; font-size: 0.82rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, .card { transition: none; }
  .btn:hover, .card:hover { transform: none; }
}