/* Keep the landing page light and independent of the controller dashboard.
   Bump the stylesheet query token in index.html when changing this file. */
:root {
  color-scheme: light;
  --plane: #eef3fa;
  --surface: #fff;
  --ink: #152337;
  --ink-2: #46566b;
  --muted: #58697f;
  --line: #cfd9e6;
  --accent: #245da8;
  --accent-strong: #194b8b;
  --radius: 14px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 24px;
}
body {
  margin: 0;
  background: var(--plane);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap {
  width: min(100%, 1120px);
  margin-inline: auto;
  padding-inline: 32px;
}
a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover {
  color: var(--accent-strong);
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
  border-radius: 3px;
}
h1,
h2,
h3,
p,
figure,
dl {
  margin: 0;
}
h1 {
  font-size: clamp(2.25rem, 4.4vw, 3.6rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
  font-weight: 700;
}
h2 {
  font-size: clamp(1.65rem, 2.5vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.025em;
}
h3 {
  font-size: 1.1rem;
  line-height: 1.4;
}
code,
pre {
  font-family: var(--mono);
}
code {
  font-size: 0.9em;
  overflow-wrap: anywhere;
}
.skip-link {
  position: absolute;
  top: 8px;
  left: 16px;
  z-index: 1;
  padding: 8px 16px;
  background: var(--surface);
  transform: translateY(-150%);
}
.skip-link:focus {
  transform: translateY(0);
}
.eyebrow {
  margin-bottom: 12px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Navigation and overview */
.bar {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px 32px;
  padding-block: 20px;
}
.brand {
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 750;
  text-decoration: none;
  letter-spacing: -0.025em;
}
.brand span {
  color: var(--accent);
}
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}
.nav a {
  color: var(--ink-2);
  font-size: 0.9rem;
  text-decoration: none;
  padding-block: 4px;
}
.nav a:hover {
  color: var(--accent);
  text-decoration: underline;
}
.hero {
  display: grid;
  grid-template-columns: 1.45fr 1fr;
  align-items: center;
  gap: 48px;
  padding-block: 80px 64px;
}
.lede {
  max-width: 54ch;
  margin-top: 24px;
  font-size: 1.12rem;
  color: var(--ink-2);
}
.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.btn {
  display: inline-block;
  padding: 10px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
  font-weight: 600;
  text-decoration: none;
}
.btn:hover {
  border-color: var(--accent);
}
.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn.primary:hover {
  background: var(--accent-strong);
}
.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 22px;
  font-size: 0.82rem;
}
.overview {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.overview dl > div + div {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.overview dt {
  font-size: 0.82rem;
  font-weight: 700;
}
.overview dd {
  margin: 6px 0 0;
  color: var(--ink-2);
  font-size: 0.92rem;
}
.overview > p:last-child {
  margin-top: 24px;
  font-size: 0.85rem;
}

/* Reading rhythm */
main > section + section {
  padding-block: 52px;
  border-top: 1px solid var(--line);
}
.section-heading {
  max-width: 74ch;
  margin-bottom: 24px;
}
.section-heading > p:last-child:not(.eyebrow) {
  margin-top: 14px;
  color: var(--ink-2);
}
.note {
  max-width: 86ch;
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.92rem;
}
.note > a + a {
  margin-left: 18px;
}

/* Architecture uses native text so it reflows with zoom and narrow screens. */
.architecture {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.architecture-flow {
  display: grid;
  grid-template-columns: 1fr 48px 1fr 48px 1fr;
  align-items: stretch;
}
.node {
  min-width: 0;
  padding: 22px 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f7f9fc;
}
.node-controller {
  border-color: #8aaedc;
  background: #eaf2fd;
}
.node p {
  margin-top: 10px;
  color: var(--ink-2);
  font-size: 0.9rem;
}
.connection {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 0.68rem;
}
.connection span:last-child {
  font-size: 1.5rem;
  line-height: 1.2;
}
figcaption {
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 94ch;
}

/* Command examples */
.terms {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.term {
  min-width: 0;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #e6edf7;
}
.term h3 {
  margin-bottom: 18px;
  font-size: 0.9rem;
}
.term pre {
  margin: 0;
  overflow-x: auto;
  padding-bottom: 8px;
}
.term pre code {
  font-size: 0.78rem;
  white-space: pre;
  overflow-wrap: normal;
  line-height: 1.7;
}
.term p {
  margin-top: 16px;
  color: var(--ink-2);
  font-size: 0.86rem;
}

/* Engine cards and capability summaries */
.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}
.card {
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}
.card p:not(.eyebrow) {
  margin-top: 12px;
  margin-bottom: 18px;
  color: var(--ink-2);
  font-size: 0.94rem;
}
.card .eyebrow {
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}
.card h3 {
  font-size: 1.25rem;
}
.card .more {
  margin-top: auto;
  font-size: 0.84rem;
}
.engine-qemu {
  border-top: 3px solid #2a78d6;
}
.engine-firecracker {
  border-top: 3px solid #cf5d30;
}
.engine-docker {
  border-top: 3px solid #168563;
}
.features h3 {
  font-size: 1.02rem;
}
.callout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 28px;
  padding: 24px 28px;
  margin-top: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #f7f9fc;
}
.callout p:not(.eyebrow) {
  color: var(--ink-2);
  font-size: 0.92rem;
}
.callout .more {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.85rem;
}

/* Environment states: labels carry meaning as well as color. */
.states {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}
.state {
  padding: 18px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--muted);
  border-radius: 10px;
  background: var(--surface);
}
.state dt {
  font-weight: 700;
}
.state dd {
  margin: 10px 0 0;
  font-size: 0.85rem;
  color: var(--ink-2);
}
.creating {
  border-top-color: #ad7600;
}
.active {
  border-top-color: #17804e;
}
.failed {
  border-top-color: #c14343;
}
.deleting {
  border-top-color: #c16832;
}
.points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
  max-width: 90ch;
}
.points li {
  padding-left: 20px;
  border-left: 2px solid #98b2d2;
  color: var(--ink-2);
}
.points strong {
  color: var(--ink);
}

/* Documentation links */
.doc-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 28px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.doc-links a {
  display: block;
  padding-block: 20px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}
.doc-links h3 {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 1rem;
}
.doc-links p {
  margin-top: 6px;
  color: var(--ink-2);
  font-size: 0.9rem;
}
.doc-links a:hover h3 {
  text-decoration: underline;
}
footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}
.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding-block: 28px;
  color: var(--muted);
  font-size: 0.85rem;
}
.foot p:last-child {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

@media (max-width: 900px) {
  .bar-inner {
    align-items: flex-start;
    flex-direction: column;
  }
  .hero {
    grid-template-columns: 1.2fr 1fr;
    gap: 24px;
  }
  .overview {
    padding: 22px;
  }
  .grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .engines {
    grid-template-columns: 1fr;
  }
  .states {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .wrap {
    padding-inline: 20px;
  }
  .nav {
    gap: 4px 18px;
  }
  .hero {
    grid-template-columns: 1fr;
    padding-block: 44px;
    gap: 32px;
  }
  h1 {
    font-size: clamp(2rem, 8.5vw, 2.8rem);
  }
  main > section + section {
    padding-block: 36px;
  }
  .architecture {
    padding: 20px;
  }
  .architecture-flow {
    grid-template-columns: 1fr;
  }
  .connection {
    flex-direction: row;
    gap: 10px;
    padding-block: 8px;
  }
  .connection span:last-child {
    transform: rotate(90deg);
  }
  .terms,
  .grid,
  .callout,
  .doc-links {
    grid-template-columns: 1fr;
  }
  .term,
  .card {
    padding: 20px;
  }
  .term pre code {
    font-size: 0.74rem;
  }
  .callout {
    padding: 20px;
    gap: 12px;
  }
  .states {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 360px) {
  .wrap {
    padding-inline: 16px;
  }
  .states {
    grid-template-columns: 1fr;
  }
}