/* ---------- Tokens ---------- */
:root {
  --bg: #eef2f5;
  --surface: #ffffff;
  --ink: #12202b;
  --muted: #4b5d6b;
  --line: #c5d0d8;
  --ok: #0e7c86;
  --warn: #c98a00;
  --link: #0b6670;
  --focus: #0b6670;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --page: 68rem;
  --gutter: clamp(1.25rem, 5vw, 3rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1a22;
    --surface: #14242e;
    --ink: #e5edf2;
    --muted: #9db0be;
    --line: #2a3c48;
    --ok: #3fb6c0;
    --warn: #e5a93a;
    --link: #6cc9d2;
    --focus: #6cc9d2;
  }
}

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

html { scroll-behavior: smooth; }

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

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.015em;
  margin: 0;
}

p { margin: 0 0 1rem; max-width: 62ch; }
ul { margin: 0; padding: 0; list-style: none; }

a { color: var(--link); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }

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

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.05em 0.35em;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--ink);
  color: var(--bg);
  padding: 0.5rem 0.9rem;
  z-index: 10;
}
.skip:focus { left: 0.5rem; }

/* ---------- Header ---------- */
.site-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem 2rem;
  max-width: var(--page);
  margin: 0 auto;
  padding: 1.5rem var(--gutter);
}

.brand {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}

.site-header nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.75rem; }
.site-header nav a { color: var(--muted); text-decoration: none; }
.site-header nav a:hover { color: var(--ink); text-decoration: underline; }

/* ---------- Layout ---------- */
main { max-width: var(--page); margin: 0 auto; padding: 0 var(--gutter); }

.block { padding: clamp(3rem, 8vw, 5.5rem) 0 0; }
.block h2 { font-size: clamp(1.75rem, 3.5vw, 2.35rem); margin-bottom: 1rem; }
.narrow { max-width: 44rem; }
.section-note { color: var(--muted); margin-bottom: 2rem; }
.small { color: var(--muted); font-size: 0.9rem; }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 4.5rem);
  align-items: center;
  padding-top: clamp(2rem, 6vw, 4rem);
}

.hero h1 {
  font-size: clamp(2.5rem, 6.2vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
  margin-bottom: 1.5rem;
}

.lead {
  font-size: clamp(1.1rem, 2vw, 1.3rem);
  color: var(--muted);
  max-width: 34rem;
  margin-bottom: 2rem;
}

.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.75rem; margin: 0; }

.button {
  display: inline-block;
  background: var(--ink);
  color: var(--bg);
  padding: 0.75rem 1.4rem;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
}
.button:hover { background: var(--link); color: var(--bg); }
.text-link { font-weight: 600; }

/* ---------- Fleet grid (the memorable element) ---------- */
.fleet-wrap { margin: 0; }

.fleet {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: clamp(0.45rem, 1.2vw, 0.75rem);
  padding: clamp(1rem, 3vw, 1.6rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}

.fleet li {
  aspect-ratio: 1;
  border-radius: 4px;
  background: var(--ok);
  animation: wake 0.5s ease-out both;
  animation-delay: calc(var(--i) * 45ms);
}

.fleet li.drift { background: var(--warn); }

.fleet-wrap figcaption {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.95rem;
}

@keyframes wake {
  from { background: var(--line); opacity: 0.4; }
}

/* ---------- Projects ---------- */
.projects { border-bottom: 1px solid var(--line); }

.projects li {
  display: grid;
  grid-template-columns: minmax(0, 14rem) minmax(0, 1fr) minmax(0, 11rem);
  gap: 0.5rem 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}

.projects h3 { font-size: 1.35rem; }
.projects h3 a { color: var(--ink); text-decoration: none; }
.projects h3 a:hover { color: var(--link); text-decoration: underline; }
.projects p { margin: 0; }
.tags { color: var(--muted); font-size: 0.9rem; text-align: right; }

/* ---------- Open source list ---------- */
.plain li { padding: 0.6rem 0; border-top: 1px solid var(--line); max-width: 62ch; }
.plain li:last-child { border-bottom: 1px solid var(--line); }

/* ---------- Footer ---------- */
.site-footer {
  max-width: var(--page);
  margin: clamp(4rem, 10vw, 7rem) auto 0;
  padding: 1.75rem var(--gutter) 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}
.site-footer p { margin: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 52rem) {
  .hero { grid-template-columns: 1fr; }
  .projects li { grid-template-columns: 1fr; gap: 0.35rem; }
  .tags { text-align: left; }
}

@media (max-width: 30rem) {
  .fleet { grid-template-columns: repeat(4, 1fr); }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .fleet li { animation: none; }
}