:root {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #1f2630;
  --border: #2a313c;
  --ink: #e6edf3;
  --ink-dim: #9aa4b1;
  --accent: #4ea1ff;
  --accent-strong: #1f7ae0;
  --max: 1100px;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; display: block; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

h1, h2, h3 { line-height: 1.2; margin: 0 0 .5em; color: var(--ink); }
h1 { font-size: clamp(2rem, 4vw, 2.75rem); letter-spacing: -0.02em; }
h2 { font-size: 1.6rem; letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; color: var(--ink-dim); }

.plain-list { list-style: none; padding: 0; margin: 0; }
.plain-list li { margin: .25rem 0; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding-top: 1rem; padding-bottom: 1rem;
}
.brand { display: flex; flex-direction: column; align-items: flex-start; color: var(--ink); gap: .25rem; }
.brand:hover { text-decoration: none; }
.brand-logo { display: block; height: 110px; width: auto; max-width: none; }
.brand-tag { font-size: .8rem; color: var(--ink-dim); }

.site-nav ul {
  display: flex; gap: 1.25rem; list-style: none; padding: 0; margin: 0; flex-wrap: wrap;
}
.site-nav a {
  color: var(--ink-dim); font-size: .95rem;
  padding: .25rem 0;
  border-bottom: 2px solid transparent;
}
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a.active { color: var(--ink); border-bottom-color: var(--accent); }

.nav-toggle {
  display: none;
  background: var(--surface); border: 1px solid var(--border);
  color: var(--ink); padding: .5rem .8rem; border-radius: 6px; cursor: pointer;
}

/* Hero */
.hero {
  padding: 5rem 0 3.5rem;
  background:
    radial-gradient(ellipse at top right, rgba(78,161,255,.18), transparent 50%),
    radial-gradient(ellipse at bottom left, rgba(78,161,255,.08), transparent 60%);
  border-bottom: 1px solid var(--border);
}
.hero-eyebrow {
  display: inline-block; font-size: .8rem; letter-spacing: .15em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1rem;
}
.hero h1 { max-width: 18ch; }
.hero p.lead { font-size: 1.15rem; max-width: 60ch; color: var(--ink); }
.hero-actions { display: flex; gap: .75rem; flex-wrap: wrap; margin-top: 1.5rem; }

.btn {
  display: inline-block; padding: .7rem 1.1rem;
  background: var(--accent); color: #fff; border-radius: 8px;
  font-weight: 600; border: 1px solid var(--accent);
}
.btn:hover { background: var(--accent-strong); border-color: var(--accent-strong); text-decoration: none; }
.btn.secondary {
  background: transparent; color: var(--ink); border-color: var(--border);
}
.btn.secondary:hover { border-color: var(--accent); color: var(--accent); }

/* Sections */
.section { padding: 4rem 0; border-bottom: 1px solid var(--border); }
.section:last-child { border-bottom: none; }
.section-title { margin-bottom: 2rem; }
.section-eyebrow {
  display: block; font-size: .75rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: .35rem;
}

/* Grids */
.grid { display: grid; gap: 1.25rem; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  transition: transform .15s ease, border-color .15s ease;
}
.card:hover { transform: translateY(-2px); border-color: var(--accent); }
.card h3 { margin-top: 0; }
.card p { margin-bottom: 0; }

.card a.card-link {
  display: inline-block; margin-top: .85rem; font-weight: 600;
}

.tag {
  display: inline-block; font-size: .75rem; padding: .15rem .55rem;
  border: 1px solid var(--border); color: var(--ink-dim);
  border-radius: 999px; margin-right: .35rem; margin-top: .35rem;
}

/* People cards */
.person-card { text-align: center; }
.person-card h3 { margin-top: 1rem; margin-bottom: .15rem; }
.person-card p { margin-bottom: 0; font-size: .9rem; }
.person-photo {
  width: 140px; height: 140px; border-radius: 50%;
  background-size: cover; background-position: center top;
  background-color: var(--surface-2);
  border: 2px solid var(--border);
  margin: 0 auto;
  box-shadow: var(--shadow);
}
.person-card:hover .person-photo { border-color: var(--accent); }

/* Device cards & galleries */
.device-card { display: block; color: inherit; }
.device-card:hover { text-decoration: none; }
.device-thumb {
  width: 100%; aspect-ratio: 16 / 10;
  background-size: cover; background-position: center;
  background-color: var(--surface-2);
  border-radius: 8px; margin-bottom: 1rem;
  border: 1px solid var(--border);
}
.device-card:hover .device-thumb { border-color: var(--accent); }

.device-hero {
  margin: 1.5rem 0 2rem;
  border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; background: var(--surface-2);
}
.device-hero img {
  width: 100%; height: auto; max-height: 480px;
  object-fit: contain; display: block;
}

.device-gallery {
  display: grid; gap: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  margin-top: 1rem;
}
.device-shot {
  margin: 0; background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px;
  overflow: hidden; transition: border-color .15s ease;
}
.device-shot:hover { border-color: var(--accent); }
.device-shot img {
  width: 100%; aspect-ratio: 4 / 3;
  object-fit: cover; display: block;
  background: var(--surface-2);
}
.device-shot figcaption {
  font-size: .85rem; color: var(--ink-dim);
  padding: .65rem .85rem;
}

/* Publication list */
.pub-list { list-style: decimal inside; padding: 0; }
.pub-list li { padding: 1rem 0; }
.pub-list .entry-title { margin-bottom: .25rem; }
.pub-list .entry-meta { color: var(--ink-dim); font-size: .9rem; }

/* Image gallery */
.image-gallery {
  display: grid; gap: .65rem; margin-top: 1.5rem;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
}
.image-tile {
  display: block; aspect-ratio: 1 / 1;
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 8px; overflow: hidden;
  transition: border-color .15s ease, transform .15s ease;
}
.image-tile:hover { border-color: var(--accent); transform: translateY(-2px); }
.image-tile img {
  width: 100%; height: 100%; object-fit: cover; display: block;
}

/* Video grid */
.video-grid {
  display: grid; gap: 1.25rem; margin-top: 1rem;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}
.video-card {
  margin: 0; background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; overflow: hidden;
}
.video-frame {
  position: relative; width: 100%; aspect-ratio: 16 / 9;
  background: #000;
}
.video-frame iframe {
  position: absolute; inset: 0; width: 100%; height: 100%; border: 0;
}
.video-card figcaption {
  font-size: .9rem; color: var(--ink); padding: .7rem .9rem;
  border-top: 1px solid var(--border);
}

/* About page — history timeline */
.timeline {
  list-style: none; padding: 0; margin: 1.5rem 0 0;
  border-left: 2px solid var(--border);
}
.timeline li {
  position: relative; padding: .25rem 0 1.1rem 1.5rem;
}
.timeline li::before {
  content: ""; position: absolute; left: -7px; top: .55rem;
  width: 12px; height: 12px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg);
}
.timeline-date {
  font-size: .8rem; letter-spacing: .04em; color: var(--accent);
  font-variant-numeric: tabular-nums; margin-bottom: .15rem;
}
.timeline-text { color: var(--ink); }

/* Lists for publications/news/awards */
.entry-list { list-style: none; padding: 0; margin: 0; }
.entry-list li {
  padding: 1.1rem 0; border-bottom: 1px solid var(--border);
}
.entry-list li:last-child { border-bottom: none; }
.entry-meta { color: var(--ink-dim); font-size: .85rem; }
.entry-title { font-weight: 600; color: var(--ink); }

/* Forms */
form.contact {
  display: grid; gap: 1rem; max-width: 640px;
  background: var(--surface); padding: 1.75rem; border: 1px solid var(--border);
  border-radius: var(--radius); margin-top: 1.5rem;
}
.form-row { display: grid; gap: .35rem; }
.form-row label { font-size: .9rem; color: var(--ink-dim); }
.form-row .req { color: var(--accent); margin-left: .15rem; }
form.contact input[type=text],
form.contact input[type=email],
form.contact textarea {
  width: 100%; padding: .7rem .85rem; background: var(--surface-2);
  border: 1px solid var(--border); border-radius: 6px; color: var(--ink);
  font: inherit;
}
form.contact textarea { min-height: 140px; resize: vertical; }
form.contact input:focus, form.contact textarea:focus {
  outline: none; border-color: var(--accent);
}
.muted { color: var(--ink-dim); font-size: .8rem; }

.consent-row { padding-top: .35rem; }
.consent-label {
  display: grid; grid-template-columns: auto 1fr; gap: .65rem;
  align-items: start; font-size: .9rem; color: var(--ink-dim); line-height: 1.5;
  cursor: pointer;
}
.consent-label input[type=checkbox] {
  margin-top: .25rem; width: 18px; height: 18px;
  accent-color: var(--accent); cursor: pointer;
}
.consent-label a { color: var(--accent); }

.alert {
  padding: .85rem 1rem; border-radius: 8px;
  background: rgba(78,161,255,.12); color: var(--ink);
  border: 1px solid var(--accent); margin-bottom: 1.25rem;
}
.alert-ok    { background: rgba(40,180,99,.12);  border-color: #34c759; }
.alert-error { background: rgba(255,69,58,.12);  border-color: #ff453a; }

/* Footer */
.site-footer {
  margin-top: 3rem; background: var(--surface); border-top: 1px solid var(--border);
  padding: 3rem 0 1.25rem; color: var(--ink-dim);
}
.footer-grid {
  display: grid; gap: 2rem; grid-template-columns: 2fr 1fr 1fr;
  padding-bottom: 2rem; border-bottom: 1px solid var(--border);
}
.footer-grid h3 { color: var(--ink); font-size: 1rem; margin-bottom: .5rem; }
.footer-logo { display: block; height: 56px; width: auto; max-width: none; opacity: .92; }
.footer-bottom { padding-top: 1.25rem; }

@media (max-width: 800px) {
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .nav-toggle { display: inline-block; }
  .site-nav ul {
    display: none; flex-direction: column; gap: .5rem;
    position: absolute; right: 1.25rem; top: 100%;
    background: var(--surface); border: 1px solid var(--border);
    padding: 1rem; border-radius: var(--radius); min-width: 200px;
    box-shadow: var(--shadow);
  }
  .site-nav.open ul { display: flex; }
  .header-inner { position: relative; }
}