:root {
  --canvas: #F8F5EF; --sheet: #FFFFFF; --raised: #F0EEEA; --ink: #181B1A; --muted: #606661;
  --line: #D8D9D4; --accent: #FF7A1A; --accent-ink: #181B1A;
  --good: #166534; --good-bg: #E6F4EA; --warn: #8c5c18; --warn-bg: #FFF4D6; --bad: #9F1239; --bad-bg: #FBE7EC;
  color-scheme: light;
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #111515; --sheet: #202222; --raised: #2A2D2C; --ink: #F8F5EF; --muted: #B8BDB8;
    --line: #434844; --good: #4ADE80; --good-bg: #13301D; --warn: #FFC861; --warn-bg: #352A12; --bad: #FF8FA3; --bad-bg: #3A1620;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --canvas: #111515; --sheet: #202222; --raised: #2A2D2C; --ink: #F8F5EF; --muted: #B8BDB8;
  --line: #434844; --good: #4ADE80; --good-bg: #13301D; --warn: #FFC861; --warn-bg: #352A12; --bad: #FF8FA3; --bad-bg: #3A1620;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --canvas: #F8F5EF; --sheet: #FFFFFF; --raised: #F0EEEA; --ink: #181B1A; --muted: #606661;
  --line: #D8D9D4; --good: #166534; --good-bg: #E6F4EA; --warn: #8c5c18; --warn-bg: #FFF4D6; --bad: #9F1239; --bad-bg: #FBE7EC;
  color-scheme: light;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--canvas); color: var(--ink); line-height: 1.55; }
a { color: var(--ink); }
.site-header, .site-footer { display: flex; align-items: center; justify-content: space-between; gap: 1rem; max-width: 76rem; margin: 0 auto; padding: 1.25rem 1.5rem; }
.site-header { border-bottom: 1px solid var(--line); }
/* P1-SUP-01-ios: inside the native app (support.html's own bootstrap script sets this
   before first paint), the website's own navigation chrome must not show -- same rule
   css/heritage.css's html[data-app] .mast/.foot already applies to every other page. */
html[data-app] .site-header, html[data-app] .site-footer { display: none !important; }
.wordmark { color: var(--ink); font-size: 1.1rem; font-weight: 700; text-decoration: none; }
nav { display: flex; flex-wrap: wrap; gap: 1rem; font-size: .95rem; }
nav a[aria-current='page'] { color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: .25rem; }
main { max-width: 76rem; margin: 0 auto; padding: 3rem 1.5rem 4rem; }
.support-hero { max-width: 50rem; padding: 2rem 0 3rem; }
.eyebrow { margin: 0 0 .5rem; color: var(--accent); font: 700 .75rem/1.2 system-ui, sans-serif; letter-spacing: .12em; text-transform: uppercase; }
h1, h2 { margin: 0 0 1rem; line-height: 1.15; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 6vw, 3.25rem); max-width: 16ch; font-weight: 700; }
h2 { font-size: clamp(1.4rem, 2.5vw, 1.75rem); font-weight: 700; }
p { margin: .5rem 0 0; }
.lede { color: var(--muted); font-size: 1.1rem; max-width: 42rem; }
.panel { margin: 1.5rem 0; padding: clamp(1.25rem, 4vw, 2rem); background: var(--sheet); border: 1px solid var(--line); border-radius: 16px; }
.section-heading { max-width: 48rem; margin-bottom: 1.5rem; }
.section-heading > p:last-child { color: var(--muted); }
.controls { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
label { display: grid; gap: .45rem; font-weight: 700; }
select, button, textarea, input { font: inherit; }
select, input { width: 100%; min-height: 44px; padding: .6rem .75rem; color: var(--ink); background: var(--raised); border: 1px solid var(--line); border-radius: 12px; }
.result { margin-top: 1.5rem; padding: 1.1rem 1.2rem; background: var(--good-bg); border-left: 4px solid var(--good); border-radius: 12px; }
.result h3 { margin: 0; font-size: 1.2rem; color: var(--ink); }
.result p { color: var(--muted); }
.capability-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: .75rem; margin-top: 1rem; }
.capability { padding: 1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--raised); }
.capability strong, .badge { display: block; }
.badge { margin-top: .45rem; font: 700 .72rem/1.2 system-ui, sans-serif; letter-spacing: .07em; text-transform: uppercase; }
.badge.confirmed { color: var(--good); }
.badge.unverified { color: var(--warn); }
.badge.unsupported { color: var(--bad); }
.troubleshooting-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
details { padding: 1rem 1.1rem; border: 1px solid var(--line); border-radius: 12px; background: var(--raised); }
summary { cursor: pointer; font-weight: 700; color: var(--ink); min-height: 44px; display: flex; align-items: center; }
details p { color: var(--muted); }
.summary-actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.25rem 0 .75rem; }
button { min-height: 44px; padding: .65rem 1rem; color: var(--accent-ink); background: var(--accent); border: 1px solid var(--accent); border-radius: 12px; cursor: pointer; font-weight: 700; }
button.secondary { color: var(--ink); background: var(--sheet); border-color: var(--line); }
button:hover { filter: brightness(0.95); }
textarea { width: 100%; resize: vertical; padding: .9rem; color: var(--ink); background: var(--raised); border: 1px solid var(--line); border-radius: 12px; }
.small-status { min-height: 1.5em; color: var(--muted); font: .9rem/1.4 system-ui, sans-serif; }
.site-footer { border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; }
.noscript { max-width: 76rem; margin: 1rem auto; padding: 1rem 1.5rem; background: var(--warn-bg); color: var(--ink); border-radius: 12px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
@media (max-width: 680px) { .site-header, .site-footer { align-items: flex-start; flex-direction: column; } main { padding-top: 2rem; } .controls, .capability-list, .troubleshooting-grid { grid-template-columns: 1fr; } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; } }