:root {
  --bg: #f5f7f8; --surface: #ffffff; --fg: #14212b; --muted: #53636f; --line: #d8e0e5; --accent: #0b7a75;
  --font: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f171d; --surface: #17222a; --fg: #e4ecf0; --muted: #9bacb7; --line: #2b3a44; --accent: #4fc7bf; color-scheme: dark; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 var(--font); padding: 24px 16px 64px; }
main { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
h1 { font-size: clamp(1.8rem, 5vw, 2.4rem); line-height: 1.2; margin: 0; letter-spacing: -.02em; }
h2 { font-size: 1.25rem; margin: 28px 0 0; }
p, li { max-width: 68ch; }
ul { padding-left: 1.2em; display: flex; flex-direction: column; gap: 6px; }
a { color: var(--accent); }
.lead { color: var(--muted); font-size: 1.1rem; }
.meta { color: var(--muted); font-size: .9rem; }
nav { display: flex; flex-wrap: wrap; gap: 8px 20px; padding-bottom: 12px; border-bottom: 1px solid var(--line); }
nav a { text-decoration: none; font-weight: 600; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 16px; }
footer { color: var(--muted); font-size: .9rem; border-top: 1px solid var(--line); padding-top: 16px; }
button { font: inherit; font-weight: 600; background: var(--accent); color: #fff; border: 0; border-radius: 8px; padding: 12px 20px; cursor: pointer; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
button[disabled] { opacity: .5; cursor: default; }
.picker main { max-width: 440px; margin-top: 12vh; text-align: left; }
[hidden] { display: none !important; }
html[data-lang="pt"] [lang="en"], html[data-lang="en"] [lang="pt-BR"] { display: none; }