:root {
  --paper: #F5F7FA;
  --panel: #FFFFFF;
  --ink: #13243D;
  --muted: #56677F;
  --line: #D9E1EB;
  --signal: #1E6BE6;
  --signal-soft: #E6EFFD;
  --warn: #E38A12;
  --danger: #D93A2F;
  --deep: #16305A;
  --sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --wrap: 1080px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0F1826;
    --panel: #172235;
    --ink: #E8EEF6;
    --muted: #9AA9BD;
    --line: #26344A;
    --signal: #5FA8FF;
    --signal-soft: #1A2C47;
    --deep: #0B1422;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

a { color: var(--signal); text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; border-radius: 4px; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* Header */
.site-header { border-bottom: 1px solid var(--line); }
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none;
}
.brand img { width: 32px; height: 32px; }
.site-nav { display: flex; gap: 22px; align-items: center; }
.site-nav a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); }
.site-nav .nav-download {
  color: var(--paper); background: var(--ink);
  padding: 7px 14px; border-radius: 9px; font-weight: 600;
}
.site-nav .nav-download:hover { color: var(--paper); opacity: .9; }

/* Buttons */
.store-button {
  display: inline-flex; align-items: center; gap: 10px;
  background: var(--ink); color: var(--paper);
  padding: 12px 20px 12px 16px; border-radius: 12px;
  text-decoration: none; font-weight: 600; font-size: 16px;
}
.store-button svg { width: 22px; height: 22px; fill: currentColor; }
.store-button:hover { text-decoration: none; opacity: .9; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); margin-top: 96px; padding: 32px 0 48px; color: var(--muted); font-size: 15px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 16px 32px; justify-content: space-between; align-items: center; }
.site-footer nav { display: flex; gap: 22px; flex-wrap: wrap; }
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--ink); }

/* Legal / support pages */
.doc { max-width: 720px; margin: 0 auto; padding: 56px 24px 0; }
.doc h1 { font-size: clamp(32px, 5vw, 44px); line-height: 1.1; letter-spacing: -0.02em; margin: 0 0 8px; }
.doc .updated { color: var(--muted); margin: 0 0 32px; font-size: 15px; }
.doc .summary {
  background: var(--signal-soft); border-left: 4px solid var(--signal);
  padding: 18px 20px; border-radius: 0 10px 10px 0; margin: 0 0 40px;
}
.doc .summary p { margin: 0; }
.doc .summary ul { margin: 8px 0 0; padding-left: 20px; }
.doc h2 { font-size: 22px; line-height: 1.3; margin: 44px 0 12px; letter-spacing: -0.01em; }
.doc h3 { font-size: 18px; margin: 28px 0 8px; }
.doc p, .doc li { color: var(--ink); }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 12px 0 8px; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); }
.doc th { font-weight: 600; color: var(--muted); }
.doc .table-scroll { overflow-x: auto; }
.doc details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.doc summary { cursor: pointer; font-weight: 600; font-size: 17px; }
.doc details p, .doc details ol, .doc details ul { margin: 10px 0 4px; }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .wrap { padding: 0 16px; }
  .doc { padding: 40px 16px 0; }
  .site-nav { gap: 16px; }
  .site-nav .nav-hide-sm { display: none; }
}