:root {
  --bg: #07090f;
  --bg-2: #0d111b;
  --card: rgba(255, 255, 255, 0.04);
  --border: rgba(255, 255, 255, 0.09);
  --text: #e8ecf5;
  --muted: #8d97ad;
  --accent: #5eead4;
  --accent-2: #818cf8;
  --radius: 18px;
  --max: 1120px;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f6f7fb;
    --bg-2: #ffffff;
    --card: rgba(15, 23, 42, 0.04);
    --border: rgba(15, 23, 42, 0.1);
    --text: #0f172a;
    --muted: #55607a;
    --accent: #0d9488;
    --accent-2: #4f46e5;
  }
}
:root[data-theme="light"] {
  --bg: #f6f7fb;
  --bg-2: #ffffff;
  --card: rgba(15, 23, 42, 0.04);
  --border: rgba(15, 23, 42, 0.1);
  --text: #0f172a;
  --muted: #55607a;
  --accent: #0d9488;
  --accent-2: #4f46e5;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: min(var(--max), 100% - 40px); margin-inline: auto; }

.grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Nav */
header.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { font-weight: 700; letter-spacing: -0.02em; display: flex; align-items: center; gap: 10px; }
.logo i { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 14px var(--accent); }
.nav ul { display: flex; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav ul a { color: var(--muted); font-size: 0.95rem; transition: color .2s; }
.nav ul a:hover { color: var(--text); }
.nav-right { display: flex; gap: 10px; align-items: center; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); color: var(--text); cursor: pointer; font-size: 1rem;
}
.menu-btn { display: none; }

/* Hero */
.hero { position: relative; min-height: 100vh; display: grid; align-items: center; overflow: hidden; padding: 120px 0 80px; }
#trace { position: absolute; inset: 0; width: 100%; height: 100%; opacity: .55; }
.hero::before {
  content: ""; position: absolute; width: 720px; height: 720px; right: -200px; top: -200px;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent-2) 35%, transparent), transparent 65%);
  filter: blur(40px);
}
.hero .wrap { position: relative; }
.badge {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--card); color: var(--muted); font-size: .85rem;
}
.badge::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
h1 { font-size: clamp(2.6rem, 7vw, 5.2rem); line-height: 1.04; letter-spacing: -0.035em; margin: 22px 0; max-width: 14ch; }
.lead { font-size: clamp(1.05rem, 2vw, 1.3rem); color: var(--muted); max-width: 56ch; }
.cta { display: flex; gap: 14px; margin-top: 34px; flex-wrap: wrap; }
.btn {
  padding: 13px 24px; border-radius: 12px; font-weight: 600; border: 1px solid var(--border);
  transition: transform .2s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: linear-gradient(120deg, var(--accent), var(--accent-2)); color: #05070c; border: none; box-shadow: 0 8px 30px -8px var(--accent); }
.btn.ghost { background: var(--card); }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 70px; }
.stat { padding: 20px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--card); }
.stat b { display: block; font-size: 2rem; letter-spacing: -0.02em; }
.stat span { color: var(--muted); font-size: .9rem; }

/* Sections */
section { padding: 100px 0; }
section.alt { background: var(--bg-2); }
.eyebrow { color: var(--accent); font-weight: 600; font-size: .85rem; letter-spacing: .12em; text-transform: uppercase; }
h2 { font-size: clamp(1.9rem, 4vw, 3rem); letter-spacing: -0.03em; line-height: 1.1; margin: 10px 0 18px; }
.sub { color: var(--muted); max-width: 60ch; margin-bottom: 48px; }

.grid { display: grid; gap: 20px; }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g2 { grid-template-columns: repeat(2, 1fr); }
.card {
  padding: 28px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--card);
  transition: transform .25s, border-color .25s;
}
.card:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); }
.card .ic {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; font-size: 1.3rem; margin-bottom: 18px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 25%, transparent), color-mix(in srgb, var(--accent-2) 25%, transparent));
}
.card h3 { margin: 0 0 8px; font-size: 1.2rem; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--muted); }
.tag { display: inline-block; margin-top: 16px; padding: 3px 10px; border-radius: 999px; font-size: .78rem; border: 1px solid var(--border); color: var(--muted); }

/* About */
.about { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; align-items: center; }
.portrait {
  aspect-ratio: 1; border-radius: 28px; border: 1px solid var(--border);
  background:
    radial-gradient(circle at 30% 25%, color-mix(in srgb, var(--accent) 40%, transparent), transparent 55%),
    radial-gradient(circle at 75% 80%, color-mix(in srgb, var(--accent-2) 45%, transparent), transparent 55%),
    var(--bg-2);
  display: grid; place-items: center; font-size: 5rem;
}
.about p { color: var(--muted); }
.skills { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.skills span { padding: 7px 14px; border-radius: 10px; background: var(--card); border: 1px solid var(--border); font-size: .9rem; }

/* Publications */
.pubs { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.pub {
  display: grid; grid-template-columns: 70px 1fr auto; gap: 20px; align-items: center;
  padding: 22px 26px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--card);
}
.pub .yr { color: var(--accent); font-weight: 700; }
.pub h4 { margin: 0 0 4px; font-size: 1.05rem; }
.pub p { margin: 0; color: var(--muted); font-size: .92rem; }
.pub a { color: var(--accent); font-weight: 600; font-size: .9rem; white-space: nowrap; }

/* Timeline */
.timeline { border-left: 2px solid var(--border); margin-left: 8px; padding-left: 28px; display: grid; gap: 34px; }
.tl { position: relative; }
.tl::before { content: ""; position: absolute; left: -36px; top: 7px; width: 14px; height: 14px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 5px var(--bg-2); }
.tl small { color: var(--accent); font-weight: 600; }
.tl h4 { margin: 2px 0 4px; font-size: 1.1rem; }
.tl p { margin: 0; color: var(--muted); }

/* Contact */
.contact { text-align: center; }
.contact .sub { margin-inline: auto; }
.mail {
  display: inline-block; font-size: clamp(1.3rem, 3.5vw, 2.2rem); font-weight: 700; letter-spacing: -0.02em;
  padding: 18px 34px; border-radius: 16px; border: 1px solid var(--border); background: var(--card);
}
.socials { display: flex; gap: 12px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.socials a { padding: 9px 18px; border-radius: 10px; border: 1px solid var(--border); color: var(--muted); transition: color .2s; }
.socials a:hover { color: var(--text); }

footer { padding: 34px 0; border-top: 1px solid var(--border); color: var(--muted); font-size: .9rem; }
footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* Reveal */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s, transform .7s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

@media (max-width: 860px) {
  .nav ul { display: none; position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; gap: 0; background: var(--bg-2); border-bottom: 1px solid var(--border); }
  .nav ul.open { display: flex; }
  .nav ul a { display: block; padding: 16px 20px; }
  .menu-btn { display: block; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .g3, .g2, .about { grid-template-columns: 1fr; }
  .pub { grid-template-columns: 1fr; gap: 6px; }
  section { padding: 72px 0; }
}