/* GPS Speed — support & legal pages.
   Layout: dark instrument-style top band (echoes the app icon), then a
   calm light reading surface; docs use a sticky table of contents on wide
   screens. Brand green comes from the icon's LCD digits. */
:root {
  --bg: #f5f7f6;
  --surface: #ffffff;
  --surface-2: #eef2f0;
  --text: #0c1210;
  --muted: #55615b;
  --line: #dfe5e2;
  --brand: #3ef05b;          /* LCD green, on dark only */
  --link: #0b7a2b;           /* readable green on light */
  --band: #070908;
  --band-text: #f2f6f3;
  --band-muted: #9fb0a6;
  --radius: 16px;
  --shadow: 0 1px 2px rgba(12, 18, 16, .05), 0 8px 24px rgba(12, 18, 16, .06);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0a0d0c; --surface: #111614; --surface-2: #161d1a; --text: #edf3ef;
    --muted: #9aa8a0; --line: #222c28; --link: #52f06a; --band: #050706;
    --shadow: none; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0a0d0c; --surface: #111614; --surface-2: #161d1a; --text: #edf3ef;
  --muted: #9aa8a0; --line: #222c28; --link: #52f06a; --band: #050706;
  --shadow: none; color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 var(--font);
}
a { color: var(--link); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--link); outline-offset: 3px; border-radius: 8px;
}
.wrap {
  max-width: 1080px; margin: 0 auto;
  padding-left: max(20px, env(safe-area-inset-left, 0px));
  padding-right: max(20px, env(safe-area-inset-right, 0px));
}

/* Bilingual: only the active language is shown. */
html[lang="en"] [data-lang="vi"], html[lang="vi"] [data-lang="en"] { display: none !important; }

/* ---------- top band ---------- */
.band { background: var(--band); color: var(--band-text); }
.topbar {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  padding-block: 14px;
}
.brand { display: flex; align-items: center; gap: 12px; color: inherit; text-decoration: none; margin-right: auto; }
.brand img { width: 40px; height: 40px; border-radius: 10px; box-shadow: 0 0 0 1px rgba(255,255,255,.08); }
.brand b { font-size: 17px; letter-spacing: -.01em; }
.brand small { display: block; color: var(--band-muted); font-size: 12px; font-weight: 500; }
.nav { display: flex; gap: 4px; }
.nav a {
  color: var(--band-muted); text-decoration: none; font-weight: 600; font-size: 15px;
  padding: 8px 12px; border-radius: 10px;
}
.nav a:hover { color: var(--band-text); background: rgba(255,255,255,.06); }
.nav a[aria-current="page"] { color: var(--band-text); background: rgba(62,240,91,.12); }
.lang-switch {
  display: inline-flex; padding: 3px; border-radius: 999px;
  background: rgba(255,255,255,.08);
}
.lang-switch button {
  border: 0; background: none; color: var(--band-muted); font: 600 13px var(--font);
  padding: 6px 12px; border-radius: 999px; cursor: pointer; min-height: 32px;
}
.lang-switch button[aria-pressed="true"] { background: var(--brand); color: #04120a; }

.hero { padding-block: 40px 56px; }
.eyebrow {
  font: 700 12px var(--font); letter-spacing: .12em; text-transform: uppercase; color: var(--brand);
}
.hero h1 {
  margin: 10px 0 12px; font-size: clamp(30px, 5.2vw, 48px); line-height: 1.08;
  letter-spacing: -.025em; text-wrap: balance; max-width: 18ch;
}
.hero p { margin: 0; color: var(--band-muted); font-size: 18px; max-width: 60ch; }
.meta { margin-top: 18px; display: flex; gap: 10px; flex-wrap: wrap; }
.chip {
  font: 500 13px var(--font); color: var(--band-text);
  border: 1px solid rgba(255,255,255,.14); border-radius: 999px; padding: 5px 12px;
}

/* ---------- content ---------- */
main { padding-block: 0 64px; }
.lift { margin-top: -28px; }
section { scroll-margin-top: 24px; }
h2 { font-size: 24px; line-height: 1.25; letter-spacing: -.015em; margin: 48px 0 12px; text-wrap: balance; }
h3 { font-size: 17px; margin: 0 0 6px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* quick actions */
.actions { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 860px) { .actions { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 460px) { .actions { grid-template-columns: 1fr; } }
.action {
  display: flex; flex-direction: column; gap: 6px; padding: 18px; min-width: 0;
  color: inherit; text-decoration: none; transition: border-color .15s, transform .15s;
}
.action:hover { border-color: var(--link); transform: translateY(-1px); }
.action .ico {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: var(--surface-2); color: var(--link); margin-bottom: 6px;
}
.action .ico svg { width: 22px; height: 22px; }
.action h3 { color: var(--text); margin: 0; }
.action > span { color: var(--muted); font-size: 14px; line-height: 1.45; }
@media (prefers-reduced-motion: reduce) { .action { transition: none; } .action:hover { transform: none; } }

/* FAQ */
.faq { display: flex; flex-direction: column; gap: 10px; }
.faq details { padding: 0; }
.faq summary {
  list-style: none; cursor: pointer; display: flex; gap: 12px; align-items: center;
  padding: 16px 18px; font-weight: 650; font-size: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; margin-left: auto; flex: none; width: 10px; height: 10px;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translateY(-3px); transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.faq .answer { padding: 0 18px 16px; color: var(--muted); }
.faq .answer p:last-child { margin-bottom: 0; }

/* contact */
.contact {
  display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 24px;
  padding: 26px; align-items: center;
}
@media (max-width: 720px) { .contact { grid-template-columns: 1fr; } }
.email-row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.email {
  font: 600 16px var(--mono); padding: 10px 14px; border-radius: 12px;
  background: var(--surface-2); user-select: all; overflow-wrap: anywhere;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 10px 18px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--surface); color: var(--text); font: 600 15px var(--font);
  cursor: pointer; text-decoration: none;
}
.btn.primary { background: var(--text); color: var(--bg); border-color: transparent; }
.checklist { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.checklist li { display: flex; gap: 10px; color: var(--muted); font-size: 15px; }
.checklist li::before { content: "›"; color: var(--link); font-weight: 700; }

/* ---------- legal doc ---------- */
.doc { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 40px; align-items: start; margin-top: 28px; }
@media (max-width: 900px) { .doc { grid-template-columns: 1fr; gap: 0; } .toc { display: none; } }
.toc {
  position: sticky; top: 24px; padding: 18px; font-size: 14px;
}
.toc b { display: block; font: 700 12px var(--font); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc ol { margin: 0; padding-left: 20px; display: grid; gap: 6px; }
.toc a { color: var(--text); text-decoration: none; }
.toc a:hover { color: var(--link); }
.article { min-width: 0; max-width: 72ch; }
.article h2 { font-size: 21px; margin-top: 40px; }
.article li { margin-bottom: 6px; }

.summary { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 760px) { .summary { grid-template-columns: 1fr; } }
.summary .card { padding: 18px; }
.summary .tag {
  font: 700 11px var(--font); letter-spacing: .1em; text-transform: uppercase; color: var(--link);
}
.summary h3 { margin-top: 6px; }
.summary p { color: var(--muted); font-size: 15px; margin: 0; }

.table-wrap { overflow-x: auto; margin: 12px 0 16px; }
table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 12px 14px; border-bottom: 1px solid var(--line); }
th { font: 700 12px var(--font); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); background: var(--surface-2); }
td:first-child { font-weight: 600; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line); padding-block: 28px 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: flex; gap: 12px 24px; flex-wrap: wrap; align-items: center; }
footer nav { display: flex; gap: 18px; margin-left: auto; }