/* css/seo.css — styling for the standalone, crawlable content pages
   (part-107-study-guide.html, part-107-practice-test.html, etc.).
   These pages exist because the main app is a hash-routed SPA whose routes
   aren't separate URLs to crawlers; each static page is a real indexable URL
   with its own title/meta/schema that links back into the app.
   Self-contained brand palette (mirrors css/styles.css :root) so these pages
   render correctly even if the app's CSS changes. */
:root {
  --bg-0: #12151a; --bg-1: #181b21; --bg-2: #1e2229;
  --border: rgba(237, 228, 207, 0.14); --border-strong: rgba(237, 228, 207, 0.30);
  --text: #ede4cf; --text-dim: #b6ad99; --text-mute: #7e7866;
  --accent: #ffb347; --accent-strong: #ff9a1f; --accent-soft: rgba(255, 179, 71, 0.16);
  --info: #8db4ff;
  --maxw: 760px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(1100px 700px at 80% -10%, rgba(141,180,255,.10), transparent 60%),
    radial-gradient(900px 600px at 0% 110%, rgba(255,179,71,.07), transparent 55%),
    var(--bg-0);
  color: var(--text);
  font-family: "Saira", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  line-height: 1.65;
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Top bar */
.topbar { border-bottom: 1px solid var(--border); background: rgba(18,21,26,.85); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 10; }
.topbar .wrap { display: flex; align-items: center; gap: 12px; height: 60px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; color: var(--text); font-weight: 700; }
.brand svg { width: 30px; height: 30px; }
.brand b { font-family: "Orbitron", sans-serif; font-weight: 700; font-size: 17px; letter-spacing: .01em; }
.topbar nav { margin-left: auto; display: flex; gap: 6px; flex-wrap: wrap; }
.topbar nav a { color: var(--text-dim); text-decoration: none; font-weight: 600; font-size: 14px; padding: 7px 12px; border-radius: 8px; }
.topbar nav a:hover { color: var(--accent); background: var(--accent-soft); }

/* Hero */
header.hero { padding: 52px 0 8px; }
.eyebrow { color: var(--accent); font-weight: 700; letter-spacing: .14em; text-transform: uppercase; font-size: 13px; margin: 0 0 12px; }
h1 { font-size: clamp(30px, 6vw, 46px); line-height: 1.08; margin: 0 0 16px; letter-spacing: -.01em; }
h1 .accent { color: var(--accent); }
.lede { font-size: 21px; color: var(--text-dim); margin: 0 0 24px; }

/* CTAs */
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 22px 0 8px; }
.btn { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; font-weight: 700; padding: 13px 22px; border-radius: 12px; font-size: 16px; border: 1px solid transparent; }
.btn--primary { background: var(--accent); color: #12151a; }
.btn--primary:hover { background: var(--accent-strong); }
.btn--ghost { border-color: var(--border-strong); color: var(--text); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* Article body */
main { padding: 14px 0 40px; }
h2 { font-size: 27px; margin: 40px 0 12px; line-height: 1.2; }
h3 { font-size: 21px; margin: 26px 0 8px; }
p, li { color: var(--text); }
a { color: var(--info); }
a:hover { color: var(--accent); }
ul, ol { padding-left: 22px; }
li { margin: 6px 0; }
strong { color: #fff; }
hr { border: none; border-top: 1px solid var(--border); margin: 36px 0; }

/* Callouts + cards */
.card { background: var(--bg-1); border: 1px solid var(--border); border-radius: 14px; padding: 20px 22px; margin: 18px 0; }
.note { border-left: 3px solid var(--accent); background: var(--accent-soft); border-radius: 0 10px 10px 0; padding: 12px 16px; margin: 18px 0; font-size: 16px; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin: 18px 0; }
.grid .card { margin: 0; }
.grid .card h3 { margin-top: 0; }
table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 16px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-dim); font-size: 13px; text-transform: uppercase; letter-spacing: .06em; }

/* FAQ (details) */
.faq details { border: 1px solid var(--border); border-radius: 12px; margin: 10px 0; background: var(--bg-1); }
.faq summary { cursor: pointer; padding: 16px 18px; font-weight: 700; font-size: 17px; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--accent); font-weight: 700; }
.faq details[open] summary::after { content: "–"; }
.faq details > p { padding: 0 18px 16px; margin: 0; color: var(--text-dim); }

/* Breadcrumb */
.crumbs { font-size: 13px; color: var(--text-mute); padding-top: 18px; }
.crumbs a { color: var(--text-mute); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }

/* Footer */
footer { border-top: 1px solid var(--border); padding: 28px 0 48px; color: var(--text-mute); font-size: 14px; }
footer a { color: var(--text-dim); }
.foot-guides { line-height: 2.1; }
.foot-guides strong { color: var(--text-dim); margin-right: 4px; }
.disclaimer { font-size: 13px; color: var(--text-mute); margin-top: 10px; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }