* { box-sizing: border-box; }

:root {
  --ink: #132238;
  --muted: #5d6b82;
  --line: #d8e0ea;
  --soft: #f6f8fb;
  --accent: #1f6feb;
  --accent-dark: #0b3d91;
  --dark: #0f172a;
  --white: #ffffff;
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
}

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

.hero {
  background: radial-gradient(circle at top left, rgba(31,111,235,0.18), transparent 32rem),
              linear-gradient(135deg, #ffffff 0%, #eef4ff 100%);
  border-bottom: 1px solid var(--line);
}

.nav {
  max-width: 1160px;
  margin: 0 auto;
  padding: 24px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand { font-weight: 800; letter-spacing: 0.04em; }
.links { display: flex; gap: 20px; font-size: 0.95rem; }

.hero-grid {
  max-width: 1160px;
  margin: 0 auto;
  padding: 72px 28px 92px;
  display: grid;
  grid-template-columns: 1.7fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.eyebrow {
  color: var(--accent-dark);
  text-transform: uppercase;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.8rem);
  line-height: 1.03;
  margin: 10px 0 24px;
  letter-spacing: -0.055em;
}

.subtitle { max-width: 790px; font-size: 1.18rem; color: var(--muted); }
.cta-row { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }

.button {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 700;
  box-shadow: 0 12px 28px rgba(31,111,235,0.23);
}

.button:hover { text-decoration: none; transform: translateY(-1px); }
.button.ghost { background: white; color: var(--accent-dark); border: 1px solid var(--line); box-shadow: none; }

.profile-card {
  background: rgba(255,255,255,0.82);
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 26px;
  box-shadow: 0 24px 70px rgba(15,23,42,0.11);
}

.profile-card img {
  width: 100%;
  aspect-ratio: 1 / 1.08;
  object-fit: cover;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: var(--soft);
}

.profile-card h2 { margin-bottom: 4px; }
.small { color: var(--muted); font-size: 0.92rem; }

.section { max-width: 1160px; margin: 0 auto; padding: 72px 28px; }
.section h2 { font-size: 2rem; margin: 0 0 26px; letter-spacing: -0.03em; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; }

.item { padding: 22px 0; border-top: 1px solid var(--line); }
.item h3 { margin: 0; font-size: 1.08rem; }
.date { color: var(--accent-dark); font-weight: 700; margin: 3px 0 12px; }

.tag-grid { display: flex; flex-wrap: wrap; gap: 12px; }
.tag-grid span {
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--soft);
  border: 1px solid var(--line);
  color: var(--ink);
  font-weight: 650;
}

.dark { max-width: none; background: var(--dark); color: var(--white); }
.dark > h2, .dark > .cards { max-width: 1104px; margin-left: auto; margin-right: auto; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.16);
  border-radius: 22px;
  padding: 26px;
}

.card h3 { margin-top: 0; font-size: 1.25rem; }
.metric { color: #b7d2ff; font-weight: 800; }

.subhead { margin-top: 34px; color: var(--accent-dark); }
.pub-list { padding-left: 1.25rem; }
.pub-list li { margin-bottom: 14px; }
.clean-list { padding-left: 1.2rem; }
.clean-list li { margin: 8px 0; }

.skill-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.skill-grid div {
  padding: 18px;
  border-radius: 16px;
  background: var(--soft);
  border: 1px solid var(--line);
}

.footer { text-align: center; padding: 64px 28px; background: var(--soft); border-top: 1px solid var(--line); }

@media (max-width: 820px) {
  .links { display: none; }
  .hero-grid, .split, .cards, .skill-grid { grid-template-columns: 1fr; }
  .hero-grid { padding-top: 40px; }
}