/* proof.lucafchala.com — no JavaScript at all (CSP script-src 'none'), so the
   theme follows the OS via prefers-color-scheme. Tokens match the ecosystem. */
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 100 900; font-display: swap; src: url('/fonts/inter-latin-wght-normal.woff2') format('woff2'); unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD; }

@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 300 500; font-display: swap; src: url('/fonts/jetbrains-mono-latin.woff2') format('woff2'); }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
    --bg: #0a0a0a; --ctrl-bg: #111111; --border: #1c1c1c; --border-strong: #2e2e2e;
    --text: #f0ebe5; --muted: #9a948c; --accent: #c0a060; --accent-dim: #6b5a35;
    --mono: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --code: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
    --serif: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    color-scheme: dark light;
}
@media (prefers-color-scheme: light) {
    :root { --bg: #f0ece8; --ctrl-bg: #ffffff; --border: #ddd9d4; --border-strong: #c9c4be; --text: #1a1715; --muted: #5f5852; --accent: #8a6428; --accent-dim: #c7a56d; }
}
html { background: var(--bg); color: var(--text); font-family: var(--mono); font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; -webkit-text-size-adjust: 100%; }
body { min-height: 100vh; max-width: 760px; margin: 0 auto; padding: 48px 32px 72px; }
::selection { background: var(--accent); color: var(--bg); }
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.skip { position: absolute; left: 12px; top: -60px; background: var(--accent); color: var(--bg); padding: 8px 14px; border-radius: 8px; font-size: 12px; text-decoration: none; }
.skip:focus { top: 12px; }

.top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 28px; font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; }
.top a { color: var(--muted); text-decoration: none; padding: 6px 0; }
.top a:hover { color: var(--accent); }
header { margin-bottom: 36px; animation: rise 0.9s cubic-bezier(0.16, 1, 0.3, 1) both; }
h1 { font-family: var(--serif); font-size: clamp(44px, 10vw, 68px); font-weight: 600; line-height: 1.05; letter-spacing: -0.035em; margin-bottom: 16px; }
h1 em { font-style: italic; color: var(--accent); }
.micro { color: var(--muted); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; }
.lede { color: var(--muted); font-size: 13px; max-width: 580px; margin-bottom: 8px; }
.lede[lang="pt-BR"] { margin-bottom: 0; }
.rule { display: flex; align-items: center; gap: 16px; margin: 36px 0 18px; color: var(--muted); font-size: 10px; letter-spacing: 0.1em; }
.rule::before, .rule::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.signed { font-family: var(--code); font-size: 12px; line-height: 1.65; color: var(--text); background: var(--ctrl-bg); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 8px; padding: 18px 20px; white-space: pre; overflow-x: auto; tab-size: 4; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.btn { display: inline-flex; align-items: center; border: 1px solid var(--border-strong); border-radius: 8px; color: var(--muted); font-size: 10px; letter-spacing: 0.09em; text-transform: uppercase; padding: 8px 12px; text-decoration: none; }
.btn:hover { color: var(--text); border-color: var(--accent-dim); }

ol.steps { list-style: none; counter-reset: s; display: flex; flex-direction: column; gap: 14px; }
ol.steps li { counter-increment: s; display: grid; grid-template-columns: 28px 1fr; gap: 4px 10px; font-size: 12px; color: var(--muted); }
ol.steps li::before { content: counter(s); color: var(--accent); font-family: var(--serif); font-size: 20px; line-height: 1; grid-row: span 2; }
code, .cmd { font-family: var(--code); }
.cmd { display: block; background: var(--ctrl-bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; color: var(--text); font-size: 11.5px; overflow-x: auto; white-space: nowrap; }
dl.facts { display: grid; grid-template-columns: max-content 1fr; gap: 6px 16px; font-size: 12px; }
dl.facts dt { color: var(--muted); }
dl.facts dd { overflow-wrap: anywhere; }
footer { margin-top: 48px; font-size: 11px; color: var(--muted); }

@keyframes rise { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@media (prefers-reduced-motion: reduce) { * { animation: none !important; } }
@media (max-width: 540px) { body { padding: 28px 16px 52px; } .signed { font-size: 11px; padding: 14px; } dl.facts { grid-template-columns: 1fr; gap: 0 0; } dl.facts dd { margin-bottom: 8px; } }