/* Alerse site. Tokens match the Pen design's variables; light by default,
   dark from the system or the toggle (html[data-theme]). No web fonts: the
   system's sans and mono, so the site loads nothing from anyone else. */
:root {
  --bg: #F7F5F0; --surface: #FFFFFF; --text: #1F1D1A; --muted: #5F5A52;
  --line: #E4E0D8; --control: #8C8579; --accent: #3F6B3A; --accent-hover: #335830;
  --on-accent: #FFFFFF; --detail: #6B4A2E; --ochre: #C9A24A;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --gutter: 120px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #161513; --surface: #1F1D1A; --text: #ECE8E1; --muted: #A39D93;
    --line: #2E2B27; --control: #6F695F; --accent: #7FA66F; --accent-hover: #93B884;
    --on-accent: #161513; --detail: #C9A24A; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #161513; --surface: #1F1D1A; --text: #ECE8E1; --muted: #A39D93;
  --line: #2E2B27; --control: #6F695F; --accent: #7FA66F; --accent-hover: #93B884;
  --on-accent: #161513; --detail: #C9A24A; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 17px/1.6 var(--sans); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
code, pre { font-family: var(--mono); font-size: 13px; }
h1, h2, h3 { font-weight: 500; margin: 0; }
h1 { font-size: 44px; line-height: 1.15; letter-spacing: -0.6px; }
h2 { font-size: 28px; line-height: 1.25; }
h3 { font-size: 20px; line-height: 1.4; }
p { margin: 0; }
.muted { color: var(--muted); }
.small { font-size: 14px; line-height: 1.5; }
.mono { font-family: var(--mono); font-size: 13px; }
.wrap { padding: 0 var(--gutter); }
.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 16px; z-index: 10; background: var(--surface); padding: 8px 12px; }
@media (prefers-reduced-motion: no-preference) {
  a, .button, .toggle { transition: background-color 150ms, color 150ms, border-color 150ms; }
}

/* Header */
.header { display: flex; align-items: center; justify-content: space-between; padding: 14px var(--gutter); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); font-size: 20px; font-weight: 500; }
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; border-radius: 7px; }
.header-right { display: flex; align-items: center; gap: 28px; }
.nav { display: flex; gap: 28px; }
.nav a { color: var(--muted); font-size: 15px; }
.nav a[aria-current="page"] { color: var(--text); }
.toggle { width: 36px; height: 36px; display: inline-grid; place-items: center; border: 1px solid var(--control); border-radius: 8px; background: transparent; color: var(--muted); cursor: pointer; }
.toggle svg { width: 16px; height: 16px; }
.icon-sun { display: none; }
:root[data-theme="dark"] .icon-sun { display: block; }
:root[data-theme="dark"] .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}

/* Buttons */
.button { display: inline-flex; align-items: center; height: 44px; padding: 0 22px; border-radius: 8px; font-size: 15px; font-weight: 500; }
.button:hover { text-decoration: none; }
.button-primary { background: var(--accent); color: var(--on-accent); }
.button-primary:hover { background: var(--accent-hover); }
.button-secondary { border: 1px solid var(--control); color: var(--text); background: var(--bg); }
.button-secondary:hover { background: var(--surface); }
.button-small { height: 36px; padding: 0 14px; font-size: 14px; }

/* Screenshots */
.shot { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--line); }

/* Landing */
.hero { display: grid; grid-template-columns: 440px 1fr; gap: 64px; align-items: center; padding: 96px var(--gutter) 88px; }
.hero-text { display: grid; gap: 24px; }
.hero .lead { font-size: 17px; color: var(--muted); }
.cta { display: grid; gap: 6px; justify-items: start; padding-top: 8px; }
.rule { width: 48px; height: 2px; background: var(--ochre); margin: 0 var(--gutter); }
.facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; padding: 64px var(--gutter) 96px; }
.facts h3 { margin-bottom: 10px; }
.facts p { font-size: 16px; color: var(--muted); }
.band { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.features { display: grid; gap: 96px; padding: 96px var(--gutter); }
.features-head { max-width: 640px; display: grid; gap: 12px; }
.feature { display: grid; grid-template-columns: 400px 1fr; gap: 72px; align-items: center; }
.feature.flip { grid-template-columns: 1fr 400px; }
.feature.flip .feature-text { order: 2; }
.feature-text { display: grid; gap: 14px; }
.feature-text p { font-size: 16px; color: var(--muted); }
.feature-text ul { margin: 6px 0 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.feature-text li { font-size: 14px; color: var(--muted); }
.feature-text li::before { content: "— "; }
.feature .shot.narrow { max-width: 440px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 96px; padding: 112px var(--gutter); }
.split > div { display: grid; gap: 16px; align-content: start; }
.kv { border-top: 1px solid var(--line); }
.kv div { display: grid; grid-template-columns: 120px 1fr; gap: 24px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.kv dt { font-size: 14px; font-weight: 500; }
.kv dd { margin: 0; font-size: 15px; color: var(--muted); }
.steps { margin: 0; padding: 0; list-style: none; display: grid; gap: 20px; counter-reset: step; }
.steps li { display: grid; grid-template-columns: 28px 1fr; counter-increment: step; }
.steps li::before { content: counter(step); font-family: var(--mono); font-size: 15px; color: var(--accent); }
.gaps { margin: 0; padding: 0; list-style: none; display: grid; gap: 14px; }
.platforms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.platform { display: grid; gap: 8px; align-content: start; justify-items: start; padding: 28px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg); }
.downloads { display: grid; gap: 40px; padding: 96px var(--gutter); }

/* Download page */
.page { display: grid; gap: 40px; padding: 88px var(--gutter) 112px; }
.page-head { max-width: 720px; display: grid; gap: 14px; }
.table { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: var(--surface); }
.table .head, .table .row { display: grid; grid-template-columns: 190px 140px 170px 180px 1fr; gap: 24px; padding: 20px 28px; }
.table .head { padding: 14px 28px; background: var(--bg); border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 500; color: var(--muted); }
.table .row + .row { border-top: 1px solid var(--line); }
.table .name { display: grid; gap: 12px; justify-items: start; font-weight: 500; }
.code { display: flex; align-items: center; gap: 12px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); margin-top: 10px; }
.code code { flex: 1; overflow-wrap: anywhere; }
.copy { border: 0; background: none; color: var(--muted); font: 13px var(--sans); cursor: pointer; padding: 4px; }
.three { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
.three p { font-size: 15px; color: var(--muted); }

/* Reading pages */
.reading { max-width: 680px; margin: 0 auto; padding: 88px 0 112px; display: grid; gap: 20px; }
.reading h2 { margin-top: 16px; }
.reading ul { margin: 0; padding-left: 0; list-style: none; display: grid; gap: 8px; }
.reading li::before { content: "— "; color: var(--muted); }
.diagram { display: flex; align-items: center; justify-content: space-between; padding: 28px 24px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.diagram .node { padding: 14px 18px; border: 1px solid var(--line); border-radius: 8px; background: var(--bg); text-align: center; font-size: 14px; font-weight: 500; }
.diagram .node span { display: block; font-size: 12px; font-weight: 400; color: var(--muted); }
.diagram .link { flex: 1; display: grid; justify-items: center; gap: 6px; font-size: 11px; color: var(--muted); }
.diagram .link::before { content: ""; width: 100%; height: 1px; background: var(--muted); order: 1; }
.diagram .link svg { width: 14px; height: 14px; color: var(--detail); }
.codeblock { padding: 14px 16px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); overflow-x: auto; }
.reading table { border-collapse: collapse; font-size: 15px; }
.reading th, .reading td { text-align: left; vertical-align: top; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); }

/* Footer */
.footer { padding: 40px var(--gutter); border-top: 1px solid var(--line); display: grid; gap: 24px; }
.footer-main { display: flex; justify-content: space-between; align-items: center; gap: 48px; }
.footer-brand { display: flex; gap: 14px; align-items: center; max-width: 560px; font-size: 14px; color: var(--muted); }
.footer-brand img { width: 24px; height: 24px; border-radius: 5px; }
.footer-links { display: flex; gap: 28px; flex-wrap: wrap; }
.footer-links a { color: var(--muted); font-size: 14px; }
.footer-legal { border-top: 1px solid var(--line); padding-top: 18px; font-size: 13px; color: var(--muted); }

/* Tablet */
@media (max-width: 1100px) {
  :root { --gutter: 40px; }
  h1 { font-size: 38px; }
  h2 { font-size: 26px; }
  .hero, .feature, .feature.flip, .split { grid-template-columns: 1fr; gap: 40px; }
  .feature.flip .feature-text { order: 0; }
  .facts, .platforms, .three { grid-template-columns: 1fr; gap: 28px; }
  .table .head { display: none; }
  .table .row { grid-template-columns: 1fr; gap: 10px; }
  .table .name { grid-auto-flow: column; justify-content: space-between; align-items: center; }
  .reading { padding: 56px var(--gutter) 80px; }
  .footer-main { flex-direction: column; align-items: start; gap: 20px; }
}
/* Phone */
@media (max-width: 600px) {
  :root { --gutter: 20px; }
  h1 { font-size: 32px; }
  h2 { font-size: 24px; }
  .nav { display: none; }
  .hero { padding: 40px var(--gutter) 48px; }
  .features, .split, .downloads, .page { padding-top: 56px; padding-bottom: 56px; }
  .table .name { grid-auto-flow: row; }
  .diagram { flex-direction: column; gap: 10px; }
  .diagram .link { width: 120px; }
  .footer-links { flex-direction: column; gap: 16px; }
}