/* Shared styles for the smaller pages (formula pack, thank-you, privacy). Same tokens as index.html. */
:root {
  --bg: #f4fbfc;
  --surface: #ffffff;
  --ink: #0f1a1c;
  --muted: #4b5f63;
  --line: #d3e6e9;
  --cyan: #10a7bf;
  --cyan-ink: #0b7d90;
  --cyan-soft: #d8f3f7;
  --amber: #f5b32c;
  --amber-ink: #1a1203;
  --header-cell: #eaf3f4;
  --shadow: 0 18px 40px -18px rgba(15, 26, 28, .35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c1416; --surface: #121e21; --ink: #e8f4f6; --muted: #9db3b7; --line: #22363a;
    --cyan: #3fd0e6; --cyan-ink: #3fd0e6; --cyan-soft: #123238; --amber: #f5b32c; --amber-ink: #1a1203;
    --header-cell: #172629; --shadow: 0 18px 40px -18px rgba(0, 0, 0, .8);
  }
}
:root[data-theme="dark"] {
  --bg: #0c1416; --surface: #121e21; --ink: #e8f4f6; --muted: #9db3b7; --line: #22363a;
  --cyan: #3fd0e6; --cyan-ink: #3fd0e6; --cyan-soft: #123238; --amber: #f5b32c; --amber-ink: #1a1203;
  --header-cell: #172629; --shadow: 0 18px 40px -18px rgba(0, 0, 0, .8);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 17px/1.6 "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: inherit; }
:focus-visible { outline: 3px solid var(--amber); outline-offset: 2px; border-radius: 4px; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.mono { font-family: "JetBrains Mono", ui-monospace, Consolas, monospace; font-variant-ligatures: none; }

.top { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 18px 0; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 900; letter-spacing: .01em; }
.brand svg { width: 30px; height: 30px; flex: none; }
.top .back { color: var(--muted); font-weight: 500; font-size: 15px; text-decoration: none; }
.top .back:hover { color: var(--ink); }

h1 { font-size: clamp(34px, 5.6vw, 58px); line-height: 1.04; margin: 22px 0 16px; font-weight: 900; letter-spacing: -.02em; text-wrap: balance; }
h1 .hl { background: var(--amber); color: var(--amber-ink); padding: 0 .12em; border-radius: 6px; }
h2 { font-size: 28px; line-height: 1.15; margin: 0 0 6px; font-weight: 900; text-wrap: balance; }
.lede { font-size: 19px; color: var(--muted); max-width: 52ch; margin: 0 0 26px; }
.sub { color: var(--muted); margin: 0 0 24px; max-width: 62ch; }
section { padding: 44px 0; border-top: 1px solid var(--line); }

.fbar {
  display: inline-flex; align-items: stretch; border: 1px solid var(--line); border-radius: 10px;
  background: var(--surface); overflow: hidden; font-size: 15px; max-width: 100%;
}
.fbar .ref { padding: 8px 12px; border-right: 1px solid var(--line); background: var(--header-cell); color: var(--muted); }
.fbar .fx { padding: 8px 10px; color: var(--muted); font-style: italic; border-right: 1px solid var(--line); }
.fbar .formula { padding: 8px 12px; overflow-x: auto; white-space: nowrap; }
.fn { color: var(--cyan-ink); font-weight: 600; }
.str { color: #c2410c; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .str { color: #fdba74; } }
:root[data-theme="dark"] .str { color: #fdba74; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: 999px;
  font: inherit; font-weight: 700; text-decoration: none; border: 2px solid var(--ink); cursor: pointer;
  background: transparent; color: var(--ink);
}
.btn.primary { background: var(--ink); color: var(--bg); }
.btn:hover { transform: translateY(-1px); }

footer { padding: 30px 0 50px; color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
footer nav { display: flex; gap: 16px; }

@media (prefers-reduced-motion: reduce) { .btn:hover { transform: none; } }