:root {
  --bg: #ffffff;
  --bg-subtle: #f4f6f8;
  --fg: #1b232c;
  --fg-muted: #57606a;
  --border: #d0d7de;
  --accent: #b5551a;
  --accent-fg: #ffffff;
  --brand: #2b3a4a;
  color-scheme: light dark;
  font-family: system-ui, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --bg-subtle: #161b22;
    --fg: #e6edf3;
    --fg-muted: #9aa5b1;
    --border: #30363d;
    --accent: #f08a3c;
    --accent-fg: #161b22;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--fg);
  background: var(--bg);
}

a {
  color: var(--accent);
}

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  max-width: 72rem;
  margin: 0 auto;
  padding: 1rem 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--fg);
  text-decoration: none;
}

.nav nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.nav nav a {
  color: var(--fg-muted);
  text-decoration: none;
}

.nav nav a:hover {
  color: var(--fg);
}

.nav nav a[aria-current="page"] {
  color: var(--fg);
  font-weight: 600;
}

main > section {
  max-width: 72rem;
  margin: 0 auto;
  padding: 3rem 1.25rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 3rem;
  align-items: center;
}

h1 {
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: 1.1;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.8rem;
  line-height: 1.2;
  margin: 0 0 1.5rem;
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.lead {
  font-size: 1.15rem;
  color: var(--fg-muted);
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 1.5rem 0 0.75rem;
}

.button {
  display: inline-block;
  padding: 0.65rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}

.fineprint {
  font-size: 0.85rem;
  color: var(--fg-muted);
}

.window {
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgb(0 0 0 / 18%);
  background: var(--bg-subtle);
}

.window::before {
  /* A plain title bar, so the screenshots read as an app window. */
  content: "";
  display: block;
  height: 26px;
  background:
    radial-gradient(circle at 16px 13px, #ff5f57 5px, transparent 6px),
    radial-gradient(circle at 34px 13px, #febc2e 5px, transparent 6px),
    radial-gradient(circle at 52px 13px, #28c840 5px, transparent 6px) var(--bg-subtle);
  border-bottom: 1px solid var(--border);
}

.window figcaption {
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
  color: var(--fg-muted);
}

.features {
  border-top: 1px solid var(--border);
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.grid article {
  padding: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-subtle);
}

.grid p {
  margin: 0;
  color: var(--fg-muted);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

.checks {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.9rem;
}

.checks li {
  padding-left: 1.8rem;
  position: relative;
}

.checks li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.get {
  border-top: 1px solid var(--border);
}

footer {
  max-width: 72rem;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  border-top: 1px solid var(--border);
  color: var(--fg-muted);
}

/* User guide (guide/index.html, built from docs/user-guide.md). */
.guide {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 3rem;
  align-items: start;
}

.guide-toc {
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow-y: auto;
  font-size: 0.9rem;
}

.guide-toc-title {
  margin: 0 0 0.5rem;
  font-weight: 700;
}

.guide-toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-toc ol ol {
  padding-left: 0.9rem;
}

.guide-toc a {
  display: block;
  padding: 0.2rem 0;
  color: var(--fg-muted);
  text-decoration: none;
}

.guide-toc a:hover {
  color: var(--fg);
}

.guide-body {
  max-width: 46rem;
}

/* Grid items otherwise grow to fit their widest line (a long code block) and overflow. */
.guide-toc,
.guide-body {
  min-width: 0;
}

.guide-body h2 {
  margin: 2.5rem 0 0.75rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.guide-body h3 {
  margin: 1.75rem 0 0.5rem;
}

.guide-body h1,
.guide-body h2,
.guide-body h3 {
  scroll-margin-top: 1rem;
}

.guide-body .anchor {
  float: left;
  margin-left: -1.1em;
  width: 1.1em;
  color: var(--fg-muted);
  text-decoration: none;
  opacity: 0;
}

.guide-body :is(h1, h2, h3):hover .anchor,
.guide-body .anchor:focus {
  opacity: 1;
}

.guide-body li + li {
  margin-top: 0.35rem;
}

.guide-body code {
  padding: 0.1em 0.35em;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.88em;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 4px;
  overflow-wrap: anywhere;
}

.guide-body pre {
  padding: 0.75rem 1rem;
  overflow-x: auto;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: 6px;
}

.guide-body pre code {
  padding: 0;
  border: 0;
}

.guide-body blockquote {
  margin: 1rem 0;
  padding: 0.25rem 1rem;
  color: var(--fg-muted);
  border-left: 3px solid var(--accent);
}

.guide-body table {
  border-collapse: collapse;
}

.guide-body th,
.guide-body td {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--border);
  text-align: left;
}

@media (max-width: 860px) {
  .hero,
  .grid,
  .gallery {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero {
    gap: 2rem;
  }

  .guide {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.5rem;
  }

  .guide-toc {
    position: static;
    max-height: none;
    padding: 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
  }
}