:root {
  --bg: #F2F4F3;
  --bg-2: #E4E9E8;
  --surface: #FFFFFF;
  --text: #1A2330;
  --muted: #4F5A68;
  --border: #CBD3D1;
  --accent: #0E6E62;
  --accent-hover: #0A5149;
  --on-accent: #FFFFFF;
  --on-strong: #FFFFFF;
  --highlight: #F2C14E;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #101817;
  --bg-2: #1C2927;
  --surface: #172321;
  --text: #F2F4F3;
  --muted: #B7C3C0;
  --border: #384946;
  --accent: #6AC9B8;
  --accent-hover: #8DE0D1;
  --on-accent: #101817;
  --on-strong: #101817;
  --highlight: #F2C14E;
}

html:not([data-theme="dark"]) { color-scheme: light; }

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }

.wrap { max-width: 68rem; margin: 0 auto; padding: 0 1.25rem; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-hover); }
h1, h2, h3 { line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.5vw, 2.1rem); }
h3 { font-size: 1.1rem; }
p { margin: 0 0 1em; }
section.wrap { padding-top: 4.5rem; }
.head { margin-bottom: 1.75rem; }
.head .sub, .sub { color: var(--muted); margin: 0.5rem 0 0; max-width: 42em; }
:focus-visible { outline: 3px solid var(--highlight); outline-offset: 2px; box-shadow: 0 0 0 2px var(--text); border-radius: 4px; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--text); color: var(--on-strong); padding: 0.7rem 1rem; z-index: 100; }
.skip:focus { left: 8px; }

/* header */
.site-header { position: sticky; top: 0; z-index: 10; background: var(--bg); border-bottom: 1px solid var(--border); }
.bar { display: flex; justify-content: space-between; align-items: center; gap: 1rem; padding-top: 0.7rem; padding-bottom: 0.7rem; flex-wrap: wrap; }
.brand { font-weight: 800; font-size: 1.1rem; text-decoration: none; color: var(--text); }
.brand span { color: var(--accent); }
.brand:hover { color: var(--text); }
nav { display: flex; align-items: center; gap: 1.2rem; flex-wrap: wrap; }
nav a:not(.btn) { display: inline-flex; align-items: center; min-height: 44px; color: var(--text); text-decoration: none; font-size: 0.95rem; }

.theme-toggle {
  display: inline-flex; align-items: center; justify-content: center; width: 44px; height: 44px;
  padding: 0; border: 1.5px solid var(--border); border-radius: 999px; background: transparent;
  color: var(--text); cursor: pointer; font: 1.25rem/1 system-ui, sans-serif;
  transition: background-color .15s, border-color .15s, color .15s, transform .15s;
}
.theme-toggle:hover { background: var(--bg-2); border-color: var(--text); transform: translateY(-1px); }
.theme-toggle:active { transform: none; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.7rem; min-height: 46px; padding: 0 1.25rem; border-radius: 8px;
  border: 1.5px solid var(--text); background: transparent; color: var(--text);
  text-decoration: none; font-family: inherit; font-weight: 600; font-size: 0.95rem; cursor: pointer;
  transition: background-color .15s, color .15s, transform .15s, box-shadow .15s;
}
.btn:hover { background: var(--text); color: var(--on-strong); transform: translateY(-2px); box-shadow: 0 4px 0 var(--highlight); }
.btn:active { transform: none; box-shadow: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn.small { min-height: 44px; padding: 0 1rem; font-size: 0.88rem; }

/* underline-grow links */
nav a:not(.btn), .links a, .cvs a, .mail {
  background: linear-gradient(var(--accent), var(--accent)) 0 100% / 0 2px no-repeat;
  transition: background-size .25s ease;
  padding-bottom: 2px;
}
nav a:not(.btn):hover, .links a:hover, .cvs a:hover, .mail:hover { background-size: 100% 2px; text-decoration: none; }

/* hero */
section.hero { display: grid; grid-template-columns: 1.12fr 1fr; align-items: center; gap: 3.25rem; padding-top: 4.5rem; }
.hero-copy, .expertise { min-width: 0; }
.crumb { font: 500 0.78rem/1.6 var(--mono); color: var(--accent); margin: 0 0 1rem; }
.hero h1 { font-size: clamp(2.3rem, 1.2rem + 3.1vw, 3.25rem); font-weight: 800; line-height: 1.08; letter-spacing: -0.04em; max-width: 19ch; text-wrap: balance; }
.lead { color: var(--muted); font-size: 1.05rem; max-width: 42em; margin: 1.5rem 0 1.75rem; }
.cta { display: flex; gap: 0.75rem; flex-wrap: wrap; margin: 0; }
.availability { color: var(--muted); font-size: 0.8rem; margin: 1.2rem 0 0; max-width: 42em; }

/* Engineering and technical leadership */
.expertise { padding: 1.5rem; border: 1px solid var(--border); border-radius: 16px; background: var(--surface); box-shadow: 0 8px 0 var(--bg-2); }
.expertise h2 { font-size: 1.05rem; line-height: 1.4; letter-spacing: -0.01em; margin-bottom: 1.25rem; }
.expertise-group { padding: 1rem; border: 1px solid var(--border); border-radius: 8px; }
.expertise-group + .expertise-group { margin-top: 0.85rem; }
.expertise-group h3 { font: 600 0.74rem/1.5 var(--mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); }
.expertise-group ul { display: grid; gap: 0.5rem; padding-left: 1rem; margin: 0.8rem 0 0; font-size: 0.84rem; color: var(--muted); }
.expertise-group li::marker { color: var(--accent); }
.expertise-group.leadership { border-color: var(--accent); background: var(--bg); }
.expertise-note { color: var(--muted); font-size: 0.78rem; line-height: 1.6; margin: 1rem 0 0; }

/* facts */
section.facts { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1.5rem; padding-top: 4rem; padding-bottom: 0.5rem; }
.facts div { border-top: 2px solid var(--text); padding-top: 0.8rem; }
.facts strong { display: block; font-size: 1.2rem; letter-spacing: -0.025em; }
.facts span { color: var(--muted); font-size: 0.92rem; }

/* filters */
.work-note { color: var(--muted); max-width: 52em; font-size: 0.9rem; margin-bottom: 1.5rem; }
.filters { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0.75rem; }
.filter-status { color: var(--muted); font-size: 0.88rem; margin-bottom: 1.25rem; }
.filter {
  font: 600 0.92rem system-ui, sans-serif; color: var(--text); background: transparent;
  border: 1.5px solid var(--border); border-radius: 999px; padding: 0.4rem 1rem; min-height: 44px; cursor: pointer;
  transition: border-color .15s, background-color .15s, color .15s;
}
.filter i { font: 500 0.78rem var(--mono); font-style: normal; color: var(--muted); margin-left: 0.3rem; }
.filter:hover { border-color: var(--text); }
.filter[aria-pressed="true"] { background: var(--text); border-color: var(--text); color: var(--on-strong); }
.filter[aria-pressed="true"] i { color: inherit; opacity: 0.8; }

/* project cards */
.projects { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr)); gap: 1.25rem; align-items: stretch; }
.project { display: flex; flex-direction: column; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; transition: border-color .2s, transform .2s; }
.project[hidden] { display: none; }
.project:hover { border-color: var(--text); transform: translateY(-3px); }
.thumb { position: relative; flex-shrink: 0; background: var(--bg-2); border-bottom: 1px solid var(--border); aspect-ratio: 2 / 1; overflow: hidden; }
.thumb img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: top center; transition: transform .4s ease; }
.project:hover .thumb img { transform: scale(1.03); }
.body { display: flex; flex-direction: column; flex: 1; padding: 1.1rem 1.25rem 1.25rem; }
.body > details { margin-top: auto; }
.meta { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 0.5rem; margin: 0 0 0.6rem; }
.cat { font: 600 0.72rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); }
.tag { font-size: 0.75rem; font-weight: 600; background: var(--bg-2); border-radius: 999px; padding: 0.1rem 0.6rem; white-space: nowrap; }
.body h3 { margin-bottom: 0.5rem; }
.body > p { color: var(--muted); font-size: 0.97rem; margin-bottom: 0.8rem; }

details summary { cursor: pointer; font-weight: 600; font-size: 0.93rem; color: var(--accent); list-style: none; display: inline-flex; align-items: center; gap: 0.4rem; min-height: 44px; }
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "→"; transition: transform .2s; }
details[open] summary::after { transform: rotate(90deg); }
summary:hover { text-decoration: underline; text-underline-offset: 3px; }
details ul { margin: 0.6rem 0; padding-left: 1.1rem; font-size: 0.93rem; }
details li { margin-bottom: 0.35rem; }
.case-study { margin: 0.75rem 0 1rem; font-size: 0.93rem; }
.case-study dt { font-weight: 700; margin-top: 0.9rem; }
.case-study dd { color: var(--muted); margin: 0.2rem 0 0; }
.stack { font: 500 0.8rem var(--mono); color: var(--muted); margin: 0.6rem 0 0.3rem; }
.related { font-size: 0.85rem; color: var(--muted); margin: 0; }
.related a { font: 500 0.82rem var(--mono); overflow-wrap: anywhere; }
.more-work { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem 2rem; border-bottom: 1px solid var(--border); padding: 1.75rem 0; }
.more-work p { flex: 1 1 18rem; margin: 0; color: var(--muted); font-size: 0.93rem; max-width: 30rem; }

/* Showcase in development */
.showcase-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; padding: 2rem; background: var(--bg-2); border: 1px solid var(--border); border-radius: 16px; }
.showcase-copy, .showcase-card { min-width: 0; }
.showcase-copy h2 { max-width: 12ch; }
.showcase-copy .sub { margin-top: 1.25rem; }
.showcase-note { color: var(--muted); font-size: 0.85rem; margin: 1.25rem 0 0; }
.showcase-card { padding: 1.5rem; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); }
.showcase-card h3 { font: 600 clamp(0.9rem, 2.5vw, 1.05rem)/1.5 var(--mono); letter-spacing: -0.02em; overflow-wrap: anywhere; margin: 1rem 0 0.75rem; }
.showcase-card p, .showcase-card ul { color: var(--muted); font-size: 0.9rem; }
.showcase-card ul { padding-left: 1.1rem; margin: 1rem 0; }
.showcase-card li + li { margin-top: 0.4rem; }
.showcase-card li::marker { color: var(--accent); }
.showcase-status { border-top: 1px solid var(--border); padding-top: 1rem; margin: 1rem 0 0.5rem; }
.showcase-link { display: inline-flex; align-items: center; gap: 0.5rem; min-height: 44px; font-weight: 600; font-size: 0.9rem; }
.st { display: inline-block; font-weight: 600; font-size: 0.75rem; white-space: nowrap; border-radius: 999px; padding: 0.2rem 0.75rem; }
.st.progress { box-shadow: inset 0 0 0 1.5px var(--accent); color: var(--accent); }
.note { border-left: 3px solid var(--text); padding: 0.1rem 0 0.1rem 1rem; margin: 1.5rem 0 0; color: var(--muted); font-size: 0.95rem; max-width: 52rem; }

/* experience */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; }
.two-col h2 { margin-bottom: 1.5rem; }
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { display: grid; grid-template-columns: 8.5rem 1fr; gap: 1rem; padding-bottom: 1.5rem; }
.timeline time { color: var(--muted); font-size: 0.9rem; padding-top: 2px; }
.timeline .period { color: var(--muted); font-size: 0.9rem; padding-top: 2px; }
.timeline strong { display: block; }
.timeline span { color: var(--muted); font-size: 0.95rem; }
.ownership { border-top: 1px solid var(--border); padding-top: 1.25rem; }
.ownership ul { padding-left: 1.1rem; margin: 0.8rem 0 0; color: var(--muted); font-size: 0.95rem; }
.ownership li + li { margin-top: 0.6rem; }
.ownership strong { color: var(--text); }
.skills { display: grid; grid-template-columns: 6.5rem 1fr; gap: 0.8rem 1rem; margin: 0; }
.skills dt { font-weight: 700; }
.skills dd { margin: 0; color: var(--muted); font-size: 0.95rem; }

/* contact */
.contact { padding-bottom: 1rem; }
.contact p { color: var(--muted); max-width: 42em; }
.mail { display: inline-block; margin: 0.5rem 0 1.25rem; font-size: clamp(1.4rem, 1rem + 2.4vw, 2.2rem); font-weight: 700; letter-spacing: -0.02em; text-decoration: none; word-break: break-word; }
.links { list-style: none; display: flex; flex-wrap: wrap; gap: 0.5rem 1.5rem; padding: 0; margin: 0 0 1.5rem; }
.links a { font-weight: 600; text-decoration: none; }
.cvs { font-size: 0.95rem; }
.cvs a { display: inline-flex; align-items: center; min-height: 44px; font-weight: 600; margin-right: 1.25rem; text-decoration: none; }

.site-footer { margin-top: 5rem; border-top: 1px solid var(--border); padding: 1.5rem 0 2rem; color: var(--muted); font-size: 0.9rem; }
.site-footer p { margin: 0 0 0.25rem; }

@media (max-width: 52rem) {
  html { scroll-padding-top: 8rem; }
  section.facts { grid-template-columns: 1fr; }
  .two-col { grid-template-columns: 1fr; gap: 3rem; }
  .showcase-layout { grid-template-columns: 1fr; gap: 2rem; }
  .showcase-copy h2 { max-width: none; }
  .timeline li { grid-template-columns: 1fr; gap: 0.1rem; }
  section.wrap { padding-top: 3.5rem; }
  section.hero { grid-template-columns: 1fr; gap: 2.5rem; padding-top: 3rem; }
  .hero h1 { max-width: 19ch; }
  .expertise { width: 100%; max-width: 34rem; }
}
@media (max-width: 30rem) {
  html { scroll-padding-top: 11rem; }
  .bar { gap: 0.35rem; }
  nav { gap: 0.35rem 0.7rem; }
  nav a:not(.btn) { font-size: 0.88rem; }
  section.facts { grid-template-columns: 1fr; }
  .projects { grid-template-columns: 1fr; }
  .expertise { padding: 1.15rem; }
  .cta .btn { flex: 1 1 auto; padding-inline: 1rem; }
  .showcase-layout { padding: 1.25rem; }
  .showcase-card { padding: 1.1rem; }
  .skills { grid-template-columns: 1fr; gap: 0.1rem; }
  .skills dd { margin-bottom: 0.7rem; }
}
@media (hover: none) { .btn:hover, .project:hover { transform: none; box-shadow: none; } .project:hover .thumb img { transform: none; } }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
  .btn:hover, .project:hover, .project:hover .thumb img { transform: none; }
}