:root {
  --paper: #ffffff;
  --paper-2: #f0f0f0;
  --ink: #161616;
  --ink-2: #555555;
  --rule: #d4d4d4;
  --accent: #161616;
  --accent-ink: #ffffff;
  --accent-soft: #e8e8e8;
  --mark: #161616;
  --bar: #c4c4c4;

  --display: "Inter", "Helvetica Neue", system-ui, sans-serif;
  --text: "Source Serif 4", Georgia, serif;

  --measure: 64ch;
  --gutter: clamp(16px, 4vw, 48px);
  --max: 1120px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #161616;
    --paper-2: #222222;
    --ink: #f2f2f2;
    --ink-2: #ababab;
    --rule: #3a3a3a;
    --accent: #f2f2f2;
    --accent-ink: #161616;
    --accent-soft: #2e2e2e;
    --mark: #f2f2f2;
    --bar: #5a5a5a;
  }
}
:root[data-theme="dark"] {
  --paper: #161616;
  --paper-2: #222222;
  --ink: #f2f2f2;
  --ink-2: #ababab;
  --rule: #3a3a3a;
  --accent: #f2f2f2;
  --accent-ink: #161616;
  --accent-soft: #2e2e2e;
  --mark: #f2f2f2;
  --bar: #5a5a5a;
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--text);
  font-size: 1.125rem;
  line-height: 1.6;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
p { margin: 0 0 1em; max-width: var(--measure); }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.skip {
  position: absolute; left: 16px; top: -48px;
  background: var(--ink); color: var(--paper);
  padding: 8px 14px; font-family: var(--display); z-index: 20;
}
.skip:focus { top: 12px; }

/* Top bar */
.bar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.bar-inner {
  max-width: var(--max); margin: 0 auto;
  padding: 10px var(--gutter);
  display: flex; align-items: center; gap: 28px;
  font-family: var(--display);
}
.wordmark { font-weight: 700; text-decoration: none; font-size: 1.05rem; white-space: nowrap; }
.bar nav { display: flex; gap: 22px; margin-right: auto; font-size: .98rem; }
.bar nav a { text-decoration: none; color: var(--ink-2); white-space: nowrap; }
.bar nav a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 5px; }

/* Buttons and links */
.btn {
  display: inline-block;
  font-family: var(--display); font-weight: 600; font-size: 1rem;
  background: var(--accent); color: var(--accent-ink);
  padding: 11px 18px; border-radius: 6px;
  text-decoration: none; border: 1.5px solid var(--accent);
  cursor: pointer;
}
.btn:hover { opacity: .85; }
.btn-small { padding: 7px 13px; font-size: .92rem; white-space: nowrap; }
.btn-quiet { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn-quiet:hover { border-color: var(--ink); opacity: 1; }
.link {
  font-family: var(--display); font-weight: 600; color: var(--accent);
  text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1.5px;
}

/* Hero */
.hero {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(40px, 7vw, 88px) var(--gutter) 24px;
  display: grid;
  grid-template-columns: 1fr minmax(180px, 260px);
  column-gap: clamp(24px, 5vw, 64px);
  align-items: end;
}
.hero h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8.5vw, 6.5rem);
  line-height: .95;
  letter-spacing: -.04em;
  margin: 0 0 .32em;
}
.lede { font-size: clamp(1.2rem, 2vw, 1.4rem); line-height: 1.5; max-width: 34em; margin: 0; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 16px; margin-top: 28px; }
.paper-cta {
  display: grid; gap: 4px; max-width: 26rem;
  background: var(--accent); color: var(--accent-ink);
  padding: 14px 20px 15px; border-radius: 6px; text-decoration: none;
}
.paper-cta:hover { opacity: .85; }
.cta-label {
  font-family: var(--display); font-weight: 700; font-size: 1.15rem; line-height: 1.2;
  text-decoration: underline; text-underline-offset: 4px; text-decoration-thickness: 1.5px;
}
.cta-note { font-size: .95rem; line-height: 1.4; opacity: .82; }
.portrait {
  width: 100%; height: auto; aspect-ratio: 4 / 5; align-self: end;
  object-fit: cover; object-position: 50% 40%;
  border-radius: 4px;
}

/* Chart */
.chart { margin: clamp(40px, 6vw, 64px) 0 0; }
.readout {
  font-family: var(--display); font-size: 1.05rem; margin: 0 0 12px; min-height: 1.6em; max-width: none;
}
.readout strong { font-size: 1.5rem; font-weight: 700; color: var(--accent); margin-right: .25em; }
.chart-plot { position: relative; }
#chart { width: 100%; height: clamp(120px, 18vw, 190px); display: block; overflow: visible; cursor: crosshair; }
#chart:focus-visible { outline-offset: 8px; }
#chart .b { fill: var(--bar); transition: fill .12s; }
#chart .b.hi { fill: var(--accent); }
#chart .b.low { fill: var(--mark); }
#chart .half { stroke: var(--ink-2); stroke-dasharray: 2 4; stroke-width: 1; vector-effect: non-scaling-stroke; }
#chart .base { stroke: var(--ink); stroke-width: 1.5; vector-effect: non-scaling-stroke; }
.mark {
  position: absolute; top: -4px; transform: translate(-50%, -100%);
  font-family: var(--display); font-size: .82rem; color: var(--ink-2); white-space: nowrap; pointer-events: none;
}
.mark-low { color: var(--ink); background: var(--paper); padding: 0 4px; margin-top: -2px; border-radius: 3px; }
.axis {
  position: relative; height: 1.9em;
  font-family: var(--display); font-size: .85rem; color: var(--ink-2);
}
.axis span { position: absolute; top: 6px; transform: translateX(-50%); }
.axis span:first-child { transform: translateX(-20%); }
.axis span:last-child { transform: translateX(-80%); }
.chart figcaption { font-size: .95rem; color: var(--ink-2); margin-top: 14px; max-width: 70ch; }

.chart.waiting #chart .b { transform: scaleY(0); transform-box: fill-box; transform-origin: bottom; }
.grow #chart .b { transform-box: fill-box; transform-origin: bottom; animation: grow .7s cubic-bezier(.2,.7,.2,1) both; }
@keyframes grow { from { transform: scaleY(0); } }
@media (prefers-reduced-motion: reduce) { .grow #chart .b { animation: none; } }

/* Sections */
.section {
  max-width: var(--max); margin: 0 auto;
  padding: clamp(56px, 8vw, 96px) var(--gutter) 0;
}
.section > h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  line-height: 1.1; letter-spacing: -.025em;
  margin: 0 0 28px; padding-top: 18px;
  border-top: 3px solid var(--ink);
}

/* Research */
.research { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 64px); }
.paper-title { font-family: var(--text); font-weight: 600; font-size: clamp(1.35rem, 2.4vw, 1.65rem); line-height: 1.3; margin: 0 0 8px; max-width: 30em; }
.paper-meta { font-family: var(--display); color: var(--ink-2); font-size: .98rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.findings { margin: 0; display: grid; gap: 22px; align-content: start; }
.findings div { border-left: 3px solid var(--accent); padding-left: 18px; }
.findings dt { font-family: var(--display); font-weight: 700; font-size: 2rem; line-height: 1.1; color: var(--accent); }
.findings dd { margin: 4px 0 0; font-size: 1rem; line-height: 1.5; }

/* Projects */
.projects { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 64px); }
.project h3 {
  font-family: var(--display); font-weight: 800; letter-spacing: -.03em;
  font-size: clamp(1.8rem, 3.8vw, 2.7rem); line-height: 1.05; margin: 0 0 10px;
}
.project h3 a { text-decoration: none; }
.project h3 a:hover { text-decoration: underline; text-decoration-thickness: 3px; text-underline-offset: 6px; }
.role { font-family: var(--display); color: var(--ink-2); font-size: 1rem; }

/* Drones + gallery */
.research-more { margin-top: clamp(40px, 6vw, 64px); padding-top: clamp(28px, 4vw, 40px); border-top: 1px solid var(--rule); }
.research-more .paper-title { margin-bottom: 16px; }
.drones-intro { columns: 2 22em; column-gap: clamp(32px, 5vw, 64px); }
.drones-intro p { break-inside: avoid; }
.gallery-wrap { margin-top: 24px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.filters button {
  font-family: var(--display); font-size: .95rem; font-weight: 600;
  background: transparent; color: var(--ink); cursor: pointer;
  border: 1.5px solid var(--rule); border-radius: 999px; padding: 6px 14px;
}
.filters button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.gallery {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 10px;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  grid-auto-flow: dense;
}
.gallery li.wide { grid-column: span 2; }
.gallery button { all: unset; display: block; cursor: zoom-in; width: 100%; height: 100%; }
.gallery button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
.gallery img { width: 100%; height: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 3px; background: var(--paper-2); }
.gallery li.wide img { aspect-ratio: auto; }
.gallery figcaption { font-family: var(--display); font-size: .85rem; color: var(--ink-2); padding-top: 6px; }
.gallery li[hidden] { display: none; }

.lightbox {
  border: 0; padding: 16px; background: var(--paper); color: var(--ink);
  max-width: min(1100px, 94vw); max-height: 92vh; border-radius: 6px;
}
.lightbox::backdrop { background: rgb(0 0 0 / .85); }
.lightbox figure { margin: 0; }
.lightbox img { max-height: 76vh; width: auto; margin: 0 auto; }
.lightbox figcaption { font-family: var(--display); font-size: .95rem; padding: 10px 0; }
.lightbox form { text-align: right; }

/* Timeline */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li {
  display: grid; grid-template-columns: 9.5rem minmax(0, 1fr); gap: 24px;
  padding: 20px 0; border-bottom: 1px solid var(--rule);
}
.timeline li:first-child { padding-top: 0; }
.when { font-family: var(--display); font-weight: 600; color: var(--ink-2); padding-top: 3px; }
.timeline h3 { font-family: var(--display); font-size: 1.25rem; line-height: 1.25; margin: 0 0 6px; }
.timeline p { margin: 0; }

/* Footer */
.foot {
  max-width: var(--max); margin: clamp(64px, 9vw, 112px) auto 0;
  padding: 22px var(--gutter) 40px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px 24px;
  font-family: var(--display); font-size: .95rem; color: var(--ink-2);
  border-top: 1px solid var(--rule);
}
.foot p { margin: 0; }

/* Narrow screens */
@media (max-width: 820px) {
  .research, .projects { grid-template-columns: 1fr; }
  .bar-inner { flex-wrap: wrap; justify-content: space-between; row-gap: 6px; padding-bottom: 6px; }
  .bar nav {
    order: 3; flex-basis: 100%; margin: 0 calc(-1 * var(--gutter));
    padding: 2px var(--gutter) 4px; overflow-x: auto; scrollbar-width: none; gap: 20px;
  }
  .bar nav::-webkit-scrollbar { display: none; }
}
@media (max-width: 600px) {
  body { font-size: 1.0625rem; }
  .hero { grid-template-columns: 1fr 108px; column-gap: 16px; align-items: start; }
  .hero h1 { grid-column: 1 / -1; }
  .hero-text { display: contents; }
  .lede { grid-column: 1; }
  .portrait { grid-column: 2; grid-row: 2; }
  .hero-actions { grid-column: 1 / -1; margin-top: 24px; }
  .paper-cta { max-width: none; flex: 1 1 100%; }
  .mark { font-size: .75rem; }
  .timeline li { grid-template-columns: 1fr; gap: 4px; }
  .gallery { grid-template-columns: 1fr 1fr; gap: 8px; }
  .gallery li.wide { grid-column: 1 / -1; }
}