:root {
  color-scheme: dark;
  --bg: #090d18;
  --bg-elevated: #0f1628;
  --surface: rgba(20, 29, 51, 0.78);
  --surface-solid: #141d33;
  --text: #f5f7ff;
  --muted: #a9b4cb;
  --line: rgba(177, 195, 230, 0.16);
  --accent: #a8ffca;
  --accent-2: #8db7ff;
  --accent-3: #d5b7ff;
  --shadow: 0 26px 80px rgba(0, 0, 0, 0.34);
  --radius: 22px;
  --container: 1180px;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f7f9fc;
  --bg-elevated: #ffffff;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-solid: #ffffff;
  --text: #10182b;
  --muted: #526078;
  --line: rgba(20, 37, 65, 0.13);
  --accent: #107f54;
  --accent-2: #315fc9;
  --accent-3: #7348a9;
  --shadow: 0 24px 70px rgba(35, 52, 82, 0.13);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 92px; }

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 78% 8%, rgba(99, 138, 255, 0.13), transparent 30%),
    radial-gradient(circle at 14% 24%, rgba(120, 255, 188, 0.08), transparent 27%),
    var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  transition: background 180ms ease, color 180ms ease;
}

::selection { background: var(--accent); color: #07120d; }
a { color: inherit; }
img { max-width: 100%; display: block; }
button, a { -webkit-tap-highlight-color: transparent; }

.container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 14px; background: var(--text); color: var(--bg); border-radius: 8px; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(18px);
}
.nav { min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 780; text-decoration: none; letter-spacing: -0.02em; }
.brand-mark { display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 12px; background: linear-gradient(135deg, rgba(168,255,202,.18), rgba(141,183,255,.18)); font-size: 0.78rem; color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 25px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 0.92rem; font-weight: 650; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--text); }
.theme-toggle { width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); color: var(--text); cursor: pointer; font-size: 1rem; }
.nav-toggle { display: none; border: 0; background: transparent; padding: 8px; }
.nav-toggle span:not(.sr-only) { display: block; width: 24px; height: 2px; margin: 5px; background: var(--text); }

.hero { min-height: calc(100vh - 74px); display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(300px, .68fr); align-items: center; gap: clamp(38px, 6vw, 82px); padding-block: 54px; }
.eyebrow { margin: 0 0 16px; color: var(--accent); font-size: .76rem; font-weight: 800; letter-spacing: .16em; }
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { max-width: 820px; margin: 0; font-size: clamp(2.9rem, 5.8vw, 5.25rem); line-height: 1; letter-spacing: -.058em; font-weight: 820; }
.hero-lead { max-width: 740px; margin: 22px 0 0; color: var(--muted); font-size: clamp(1rem, 1.45vw, 1.16rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.button { display: inline-flex; min-height: 48px; align-items: center; justify-content: center; padding: 0 19px; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-weight: 750; font-size: .92rem; transition: transform 150ms ease, background 150ms ease, border-color 150ms ease; }
.button:hover { transform: translateY(-2px); }
.button.primary { background: var(--accent); color: #06130c; border-color: transparent; }
:root[data-theme="light"] .button.primary { color: #fff; }
.button.secondary { background: var(--surface); }
.quick-facts { display: flex; flex-wrap: wrap; gap: 12px 25px; margin: 26px 0 0; padding: 0; list-style: none; color: var(--muted); font-size: .88rem; }
.quick-facts li { display: inline-flex; align-items: center; gap: 9px; }
.status-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 12%, transparent); }

.hero-panel { position: relative; overflow: hidden; padding: 27px; border: 1px solid var(--line); border-radius: 30px; background: linear-gradient(145deg, var(--surface-solid), color-mix(in srgb, var(--surface-solid) 78%, var(--accent-2))); box-shadow: var(--shadow); }
.hero-panel::after { content: ""; position: absolute; width: 260px; height: 260px; border-radius: 50%; background: var(--accent-2); filter: blur(90px); opacity: .12; right: -90px; top: -100px; }
.avatar-wrap { position: relative; z-index: 1; width: 130px; height: 130px; padding: 7px; border: 1px solid var(--line); border-radius: 34px; background: rgba(255,255,255,.04); }
.avatar-wrap img { width: 100%; height: 100%; object-fit: cover; border-radius: 27px; }
.signal-grid { height: 100px; display: flex; align-items: end; gap: 8px; margin: 30px 0; }
.signal-grid span { flex: 1; min-width: 5px; border-radius: 20px 20px 4px 4px; background: linear-gradient(to top, var(--accent-2), var(--accent)); opacity: .7; animation: pulse-bars 3.8s ease-in-out infinite; }
.signal-grid span:nth-child(1){height:35%}.signal-grid span:nth-child(2){height:72%;animation-delay:.2s}.signal-grid span:nth-child(3){height:48%;animation-delay:.4s}.signal-grid span:nth-child(4){height:94%;animation-delay:.6s}.signal-grid span:nth-child(5){height:61%;animation-delay:.8s}.signal-grid span:nth-child(6){height:79%;animation-delay:1s}
@keyframes pulse-bars { 0%,100%{transform:scaleY(.82);opacity:.55} 50%{transform:scaleY(1);opacity:.9} }
.panel-label { margin: 0 0 8px; color: var(--accent); font-size: .72rem; font-weight: 800; letter-spacing: .14em; }
.hero-panel h2 { margin: 0; font-size: 1.55rem; line-height: 1.22; letter-spacing: -.035em; }
.hero-panel > p:last-child { color: var(--muted); margin-bottom: 0; }

.section { padding-block: clamp(76px, 10vw, 132px); border-top: 1px solid var(--line); }
.section-heading { display: grid; grid-template-columns: minmax(120px,.38fr) minmax(0,1fr); align-items: start; gap: 35px; margin-bottom: 58px; }
.section-heading h2 { max-width: 850px; margin: 0; font-size: clamp(2.2rem, 5vw, 4.8rem); line-height: 1.04; letter-spacing: -.057em; }
.about-grid { display: grid; grid-template-columns: 1.12fr .88fr; gap: clamp(40px, 7vw, 100px); }
.large-copy { margin: 0; font-size: clamp(1.35rem, 2.7vw, 2.15rem); line-height: 1.38; letter-spacing: -.033em; }
.capability-list article { display: grid; grid-template-columns: 42px 1fr; gap: 20px; padding: 23px 0; border-bottom: 1px solid var(--line); }
.capability-list article:first-child { padding-top: 0; }
.capability-list span { color: var(--accent); font-size: .76rem; font-weight: 850; }
.capability-list h3 { margin: -5px 0 4px; font-size: 1.16rem; }
.capability-list p { margin: 0; color: var(--muted); }

.project-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 18px; }
.project-card { min-height: 420px; display: flex; flex-direction: column; padding: clamp(26px,4vw,42px); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); box-shadow: 0 10px 50px rgba(0,0,0,.07); transition: transform 170ms ease, border-color 170ms ease; }
.project-card:hover { transform: translateY(-5px); border-color: color-mix(in srgb,var(--accent) 42%,var(--line)); }
.project-card.featured { background: linear-gradient(145deg, color-mix(in srgb,var(--surface-solid) 91%,var(--accent-2)), color-mix(in srgb,var(--surface-solid) 88%,var(--accent))); }
.project-topline { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; margin: 0 0 54px; color: var(--muted); font-size: .7rem; font-weight: 850; letter-spacing: .12em; }
.project-card h3 { margin: 0; font-size: clamp(1.65rem,3vw,2.5rem); line-height: 1.08; letter-spacing: -.045em; }
.project-card > p { color: var(--muted); font-size: 1.03rem; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; margin: 22px 0 28px; padding: 0; list-style: none; }
.tags li { padding: 6px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font-size: .75rem; }
.project-link { margin-top: auto; color: var(--accent); font-weight: 800; text-decoration: none; }
.project-link.muted { color: var(--muted); }

.research-list { border-top: 1px solid var(--line); }
.research-item { display: grid; grid-template-columns: 55px minmax(0,1fr) minmax(170px,.34fr); gap: 30px; align-items: start; padding: 42px 0; border-bottom: 1px solid var(--line); }
.research-index { color: var(--accent); font-size: .78rem; font-weight: 850; }
.research-item .project-topline { margin: 0 0 11px; }
.research-item h3 { margin: 0 0 10px; font-size: clamp(1.55rem,3vw,2.25rem); letter-spacing: -.04em; }
.research-item p:not(.project-topline) { max-width: 760px; margin: 0; color: var(--muted); }
.research-meta { color: var(--muted); font-size: .83rem; text-align: right; }

.oss-card { display: grid; grid-template-columns: .75fr 1.25fr; gap: 60px; padding: clamp(28px,5vw,58px); border: 1px solid var(--line); border-radius: 28px; background: var(--surface); box-shadow: var(--shadow); }
.oss-card h3 { margin: 0 0 12px; font-size: clamp(1.9rem,4vw,3rem); letter-spacing: -.045em; }
.oss-card > div:first-child > p:last-child { color: var(--muted); }
.pr-list { display: grid; gap: 10px; }
.pr-list a { display: grid; grid-template-columns: 86px 1fr auto; gap: 16px; align-items: center; padding: 17px 18px; border: 1px solid var(--line); border-radius: 14px; text-decoration: none; transition: background 150ms ease, transform 150ms ease; }
.pr-list a:hover { background: color-mix(in srgb,var(--surface-solid) 75%,var(--accent) 8%); transform: translateX(3px); }
.pr-list span { color: var(--muted); font-size: .72rem; font-weight: 800; letter-spacing: .08em; }
.pr-list strong { font-size: .92rem; }
.pr-list span:last-child { color: var(--accent); white-space: nowrap; }

.contact-section { padding-bottom: 150px; }
.contact-card { padding: clamp(34px,7vw,84px); border: 1px solid var(--line); border-radius: 34px; background: linear-gradient(135deg, color-mix(in srgb,var(--surface-solid) 88%,var(--accent-2)), color-mix(in srgb,var(--surface-solid) 90%,var(--accent))); box-shadow: var(--shadow); }
.contact-card h2 { max-width: 930px; margin: 0; font-size: clamp(2.3rem,5.5vw,5rem); line-height: 1.02; letter-spacing: -.06em; }
.contact-card > p:not(.eyebrow) { color: var(--muted); font-size: 1.08rem; }

.site-footer { border-top: 1px solid var(--line); color: var(--muted); }
.footer-inner { min-height: 105px; display: flex; align-items: center; justify-content: space-between; gap: 20px; font-size: .82rem; }

.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* Resume page */
.resume-page { padding-block: 72px 120px; }
.resume-shell { max-width: 980px; margin: 0 auto; }
.resume-header { display: grid; grid-template-columns: 1fr auto; gap: 30px; align-items: end; padding-bottom: 35px; border-bottom: 2px solid var(--text); }
.resume-header h1 { font-size: clamp(2.8rem,7vw,5rem); }
.resume-header p { color: var(--muted); }
.resume-links { display: grid; gap: 8px; text-align: right; }
.resume-links a { color: var(--accent); font-weight: 750; text-decoration: none; }
.resume-section { display: grid; grid-template-columns: 180px 1fr; gap: 34px; padding: 35px 0; border-bottom: 1px solid var(--line); }
.resume-section h2 { margin: 0; font-size: .8rem; letter-spacing: .13em; color: var(--accent); }
.resume-entry + .resume-entry { margin-top: 28px; }
.resume-entry h3 { margin: 0; font-size: 1.18rem; }
.resume-entry .subline { display: flex; justify-content: space-between; gap: 20px; color: var(--muted); font-size: .9rem; }
.resume-entry ul { margin: 12px 0 0; padding-left: 20px; color: var(--muted); }
.skill-lines { margin: 0; color: var(--muted); }
.print-note { color: var(--muted); font-size: .82rem; margin-top: 20px; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-panel { max-width: 560px; }
  .about-grid, .oss-card { grid-template-columns: 1fr; }
  .section-heading { grid-template-columns: 1fr; gap: 5px; }
  .research-item { grid-template-columns: 45px 1fr; }
  .research-meta { grid-column: 2; text-align: left; }
  .resume-section { grid-template-columns: 1fr; gap: 14px; }
}

@media (max-width: 720px) {
  .container { width: min(100% - 26px, var(--container)); }
  .nav-toggle { display: block; cursor: pointer; }
  .nav-links { position: absolute; top: 74px; left: 13px; right: 13px; display: none; flex-direction: column; align-items: stretch; padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: var(--bg-elevated); box-shadow: var(--shadow); }
  .nav-links.open { display: flex; }
  .theme-toggle { align-self: flex-start; }
  .hero { padding-block: 65px 88px; }
  h1 { font-size: clamp(2.85rem,14vw,4.35rem); }
  .project-grid { grid-template-columns: 1fr; }
  .project-card { min-height: 380px; }
  .research-item { gap: 15px; }
  .pr-list a { grid-template-columns: 1fr; gap: 5px; }
  .footer-inner { padding-block: 24px; flex-direction: column; align-items: flex-start; justify-content: center; }
  .resume-header { grid-template-columns: 1fr; align-items: start; }
  .resume-links { text-align: left; }
  .resume-entry .subline { flex-direction: column; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  :root, :root[data-theme="light"] { --bg:#fff; --text:#111; --muted:#444; --line:#ccc; --accent:#185f45; color-scheme:light; }
  body { background:#fff; font-size: 10.5pt; }
  .site-header, .site-footer, .print-note { display:none !important; }
  .resume-page { padding:0; }
  .resume-shell { max-width:none; }
  .resume-header h1 { font-size:32pt; }
  .resume-section { break-inside:avoid; padding:18px 0; }
  a { text-decoration:none; }
}