:root {
  --bg: #0A0F1F;
  --card: #0F1629;
  --line: #1F2A46;
  --ink: #E8ECF7;
  --soft: #B4BDD6;
  --muted: #8793B2;
  --accent: #6EE7C8;
  --pulse: #FFB86B;
  --sans: 'Space Grotesk', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: 'DM Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --pad-x: clamp(20px, 5vw, 48px);
  --nav-h: 60px;
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #F6F8FD;
    --card: #FFFFFF;
    --line: #DCE2F0;
    --ink: #0E1530;
    --soft: #38425F;
    --muted: #5A6583;
    --accent: #07775F;
    --pulse: #D26A0A;
    color-scheme: light;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3, p, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
[hidden] { display: none !important; }

.skip { position: absolute; left: 16px; top: -60px; z-index: 20; padding: 8px 14px; background: var(--card); border: 1px solid var(--accent); border-radius: 8px; }
.skip:focus { top: 12px; }

/* navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-in { display: flex; align-items: center; gap: 28px; max-width: 1080px; height: var(--nav-h); margin: 0 auto; padding: 0 var(--pad-x); }
.brand { font-weight: 600; letter-spacing: -0.01em; white-space: nowrap; }
.brand-short { display: none; }
.nav nav { display: flex; gap: 22px; margin-right: auto; font-size: 0.9375rem; color: var(--soft); }
.nav nav a { padding: 6px 0; border-bottom: 2px solid transparent; transition: color 0.15s, border-color 0.15s; }
.nav nav a:hover { color: var(--ink); }
.nav nav a[aria-current="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.social { display: flex; gap: 6px; }
.social a { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 10px; color: var(--soft); transition: color 0.15s, background 0.15s; }
.social a:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.social svg { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.social svg.fill { fill: currentColor; stroke: none; }

/* hero */
.hero { position: relative; display: flex; align-items: center; min-height: min(calc(100svh - var(--nav-h)), 780px); overflow: hidden; }
#graph {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  -webkit-mask-image: linear-gradient(to right, transparent 8%, rgba(0, 0, 0, 0.55) 40%, #000 72%);
  mask-image: linear-gradient(to right, transparent 8%, rgba(0, 0, 0, 0.55) 40%, #000 72%);
}

.hero-in { position: relative; width: 100%; max-width: 1080px; margin: 0 auto; padding: 56px var(--pad-x); }
.hero-in > * { max-width: 36rem; }

.status { display: inline-flex; align-items: center; gap: 10px; padding: 6px 14px 6px 12px; border: 1px solid var(--line); border-radius: 999px; background: color-mix(in srgb, var(--bg) 70%, transparent); font: 400 0.8125rem var(--mono); color: var(--soft); }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent); }
@media (prefers-reduced-motion: no-preference) {
  .dot { animation: ping 2.4s infinite; }
  @keyframes ping { 70% { box-shadow: 0 0 0 8px transparent; } 100% { box-shadow: 0 0 0 0 transparent; } }
  .caret { animation: blink 1.1s steps(1) infinite; }
  @keyframes blink { 50% { opacity: 0; } }
}

h1 { margin-top: 28px; font-size: clamp(2.75rem, 8vw, 4.75rem); font-weight: 500; line-height: 1.05; letter-spacing: -0.04em; }
h1 em { font-style: normal; font-weight: 700; color: var(--accent); }
.caret { display: inline-block; width: 0.09em; height: 0.82em; margin-left: 0.08em; vertical-align: -0.04em; background: var(--accent); }
.lead { margin-top: 24px; font-size: clamp(1.0625rem, 2.2vw, 1.25rem); line-height: 1.6; color: var(--soft); text-wrap: pretty; }

.facts { display: flex; flex-wrap: wrap; gap: 14px 36px; margin-top: 32px; }
.facts dt { font: 400 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
.facts dd { font-size: 0.9375rem; color: var(--ink); }

.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.btn { display: inline-flex; align-items: center; min-height: 46px; padding: 0 20px; border: 1px solid var(--line); border-radius: 10px; font-size: 0.9375rem; font-weight: 500; color: var(--ink); background: color-mix(in srgb, var(--bg) 60%, transparent); transition: border-color 0.15s, background 0.15s, color 0.15s; }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.primary { border-color: var(--accent); color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); }
.btn.primary:hover { background: color-mix(in srgb, var(--accent) 22%, transparent); }

/* sections */
.section { max-width: 1080px; margin: 0 auto; padding: 72px var(--pad-x) 0; scroll-margin-top: var(--nav-h); }
.hero { scroll-margin-top: var(--nav-h); }
.sec-title { display: flex; align-items: center; gap: 20px; margin-bottom: 36px; font-size: clamp(1.5rem, 3.4vw, 2rem); font-weight: 500; letter-spacing: -0.02em; line-height: 1.2; }
.sec-title::before { content: '/'; color: var(--accent); font-weight: 400; margin-right: -10px; }
.sec-title::after { content: ''; flex: 1; height: 1px; background: var(--line); }

.card { padding: 26px 28px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; transition: border-color 0.2s; }
.card:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.card h3 { font-size: 1.1875rem; font-weight: 600; letter-spacing: -0.015em; line-height: 1.3; }
.card p { color: var(--soft); }
.when { font: 400 0.8125rem var(--mono); color: var(--muted); letter-spacing: 0.02em; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.chips li { padding: 3px 11px; border: 1px solid var(--line); border-radius: 999px; font: 400 0.78125rem var(--mono); line-height: 1.7; color: var(--soft); }

a.ext { color: var(--ink); text-decoration: underline; text-decoration-color: color-mix(in srgb, var(--accent) 55%, transparent); text-underline-offset: 3px; transition: color 0.15s; }
a.ext:hover { color: var(--accent); }
.pub-title::after, .more-link::after, .p-link::after { content: ' ↗'; color: var(--accent); }

/* experience */
.job { display: grid; grid-template-columns: 200px 1fr; gap: 12px 32px; }
.job h3 .at { color: var(--accent); font-weight: 600; }
.points { display: grid; gap: 14px; margin-top: 18px; }
.points li { position: relative; padding-left: 22px; color: var(--soft); }
.points li::before { content: ''; position: absolute; left: 0; top: 0.72em; width: 8px; height: 2px; background: var(--accent); }
.points strong { color: var(--ink); font-weight: 600; }

/* education: tabs, all panels share one cell so the height never jumps */
.tabs { display: grid; grid-template-columns: 188px 1fr; gap: 28px 44px; align-items: start; }
.tablist { display: none; }
.js .tablist { display: flex; flex-direction: column; border-left: 1px solid var(--line); }
.tab { display: grid; gap: 1px; margin-left: -1px; padding: 12px 18px; border: 0; border-left: 2px solid transparent; background: none; font-family: var(--sans); text-align: left; color: var(--soft); cursor: pointer; transition: color 0.15s, background 0.15s, border-color 0.15s; }
.tab-t { font-size: 1rem; font-weight: 600; letter-spacing: -0.01em; }
.tab-s { font-size: 0.8125rem; color: var(--muted); transition: color 0.15s; }
.tab:hover { color: var(--ink); background: color-mix(in srgb, var(--accent) 6%, transparent); }
.tab[aria-selected="true"] { color: var(--accent); border-left-color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); }
.tab[aria-selected="true"] .tab-s { color: var(--soft); }
.panels { display: grid; gap: 48px; }
.js .panels { gap: 0; }
.js .panel { grid-area: 1 / 1; visibility: hidden; opacity: 0; transform: translateY(8px); transition: opacity 0.25s ease, transform 0.25s ease, visibility 0s linear 0.25s; }
.js .panel.is-active { visibility: visible; opacity: 1; transform: none; transition-delay: 0s; }
.panel h3 { font-size: clamp(1.1875rem, 2.4vw, 1.375rem); font-weight: 600; letter-spacing: -0.02em; line-height: 1.3; }
.panel h3 .at { color: var(--accent); }
.panel .when { margin-top: 6px; text-transform: uppercase; letter-spacing: 0.06em; }
.panel p { color: var(--soft); }
.panel .when + p, .panel .badge + p { margin-top: 16px; }
.badge { display: inline-flex; gap: 8px; margin-top: 14px; padding: 3px 12px; border: 1px solid var(--line); border-radius: 999px; font-size: 0.875rem; font-weight: 500; color: var(--soft); background: color-mix(in srgb, var(--ink) 5%, transparent); }
.pub { display: grid; gap: 4px; margin-top: 18px; padding: 16px 18px; border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px; background: color-mix(in srgb, var(--accent) 5%, transparent); transition: background 0.15s; }
.pub:hover { background: color-mix(in srgb, var(--accent) 11%, transparent); }
.pub-kind { font: 400 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.pub-title { font-weight: 600; line-height: 1.35; }
.pub-note { font-size: 0.9375rem; color: var(--soft); }
.beyond { display: grid; gap: 10px; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }
.beyond li { font-size: 0.9375rem; color: var(--soft); }
.beyond strong { color: var(--ink); font-weight: 600; }

/* projects: a swipeable gallery that shows all three at once on wide screens */
.track {
  display: flex;
  gap: 20px;
  margin: -4px;
  padding: 4px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 4px;
  scrollbar-width: none;
  overscroll-behavior-x: contain;
}
.track::-webkit-scrollbar { display: none; }
.track > li { display: flex; flex: 0 0 calc((100% - 40px) / 3); scroll-snap-align: start; }
.project { display: flex; flex-direction: column; width: 100%; padding: 0; overflow: hidden; }
.thumb { padding: 14px 18px; border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--accent) 5%, var(--card)); }
.thumb svg { display: block; width: 100%; height: auto; max-height: 112px; }
.p-body { display: flex; flex: 1; flex-direction: column; gap: 8px; padding: 20px 22px 22px; }
.project p { font-size: 0.9375rem; line-height: 1.55; }
.project .p-link { align-self: flex-start; margin-top: 4px; font-size: 0.9375rem; }
.project .chips { margin-top: auto; padding-top: 10px; }
.tag { font: 400 0.6875rem var(--mono); text-transform: uppercase; letter-spacing: 0.04em; color: var(--accent) !important; }

.gallery-foot { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 42px; margin-top: 20px; }
.more-link { margin-left: auto; font-size: 1.0625rem; }
.g-ctrls { display: flex; gap: 8px; }
.g-btn { display: grid; place-items: center; width: 42px; height: 42px; padding: 0; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--ink); cursor: pointer; transition: border-color 0.15s, color 0.15s, opacity 0.15s; }
.g-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.g-btn:disabled { opacity: 0.35; cursor: default; }
.g-btn svg { fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

/* project thumbnails */
.thumb .base { stroke: var(--line); stroke-width: 1.5; }
.thumb .fill-muted { fill: var(--muted); opacity: 0.55; }
.thumb .bar { fill: color-mix(in srgb, var(--muted) 35%, transparent); }
.thumb .bar.best { fill: var(--accent); }
.thumb .clip { fill: color-mix(in srgb, var(--muted) 30%, transparent); }
.thumb .clip.a { fill: color-mix(in srgb, var(--accent) 55%, transparent); }
.thumb .head { stroke: var(--pulse); stroke-width: 1.5; }
.thumb .head-cap { fill: var(--pulse); }

/* certifications and courses: three tiles on one line */
.certs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.cert { position: relative; display: grid; align-content: start; gap: 12px; height: 100%; padding: 18px 20px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; transition: border-color 0.2s; }
.cert::after { content: '↗'; position: absolute; top: 16px; right: 18px; color: var(--accent); opacity: 0; transition: opacity 0.15s; }
.cert:hover, .cert:focus-visible { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.cert:hover::after, .cert:focus-visible::after { opacity: 1; }
.cert-by { font-size: 0.8125rem; color: var(--muted); }
.cert-name { font-size: 1.0625rem; font-weight: 600; letter-spacing: -0.01em; line-height: 1.35; }

/* contact */
.contact { padding-bottom: 72px; }
.contact-lead { max-width: 34rem; font-size: 1.125rem; color: var(--soft); }
.contact .cta { margin-top: 24px; }
.foot { border-top: 1px solid var(--line); }
.foot p { max-width: 1080px; margin: 0 auto; padding: 24px var(--pad-x); font: 400 0.8125rem var(--mono); color: var(--muted); }

/* scroll reveal */
@media (prefers-reduced-motion: no-preference) {
  .js .reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.5s ease-out, transform 0.5s ease-out; }
  .js .reveal.in { opacity: 1; transform: none; }
}

@media (max-width: 860px) {
  .job { grid-template-columns: 1fr; }
  .track > li { flex-basis: calc((100% - 20px) / 2); }
  .certs { grid-template-columns: 1fr; gap: 12px; }
  .cert { gap: 10px; }
}

@media (max-width: 700px) {
  .tabs { grid-template-columns: 1fr; gap: 20px; }
  .js .tablist { flex-direction: row; border-left: 0; border-bottom: 1px solid var(--line); overflow-x: auto; scrollbar-width: none; }
  .tab { flex: 0 0 auto; margin: 0 0 -1px; padding: 10px 16px; border-left: 0; border-bottom: 2px solid transparent; }
  .tab[aria-selected="true"] { border-bottom-color: var(--accent); }
  .nav-in { gap: 14px; }
  .nav nav { gap: 16px; font-size: 0.875rem; overflow-x: auto; scrollbar-width: none; }
  .brand-long { display: none; }
  .brand-short { display: inline; }
  .social { display: none; }
  .card { padding: 22px 20px; }
  .project { padding: 0; }
  .track > li { flex-basis: 84%; }
  #graph { -webkit-mask-image: none; mask-image: none; opacity: 0.45; }
  .hero-in { padding-block: 40px; }
}