/* ============================================================
   Part 107 Quiz — shared stylesheet
   Zero external requests: system fonts only, no CDNs.
   Palette: aviation navy / sky blue / safety orange
   ============================================================ */
:root {
  --navy: #0b2545;
  --navy-2: #13315c;
  --navy-3: #1d4e89;
  --sky: #2d9cdb;
  --sky-soft: #e3f1fb;
  --orange: #fb8500;
  --orange-dark: #d97400;
  --green: #1b9e4b;
  --green-soft: #e4f5ea;
  --red: #d64545;
  --red-soft: #fbeaea;
  --ink: #16233a;
  --muted: #5b6b82;
  --line: #dde6f0;
  --bg: #f6f9fc;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(11, 37, 69, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 780px; }

a { color: var(--navy-3); }

/* ---------- header ---------- */
.site-header {
  background: var(--navy);
  position: sticky; top: 0; z-index: 50;
  box-shadow: 0 1px 6px rgba(0,0,0,.25);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px; padding: 12px 20px;
}
.brand {
  color: #fff; text-decoration: none; font-weight: 800; font-size: 1.15rem;
  letter-spacing: .2px; display: inline-flex; align-items: center; gap: 8px;
}
.brand .tail { color: var(--sky); }
.nav-links { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 14px; }
.nav-links a {
  color: #cfe3f5; text-decoration: none; font-size: .95rem; font-weight: 600;
  padding: 6px 4px;
}
.nav-links a:hover { color: #fff; }
.nav-links a.btn-cta {
  background: var(--orange); color: #fff; padding: 8px 14px; border-radius: 999px;
}
.nav-links a.btn-cta:hover { background: var(--orange-dark); }

/* ---------- hero ---------- */
.hero {
  background: linear-gradient(160deg, var(--navy) 0%, var(--navy-2) 55%, var(--navy-3) 100%);
  color: #fff; padding: 56px 0 48px; text-align: center;
}
.hero h1 { font-size: clamp(1.7rem, 4.2vw, 2.6rem); line-height: 1.25; margin-bottom: 14px; }
.hero p.sub { color: #c9dcef; max-width: 640px; margin: 0 auto 26px; font-size: 1.06rem; }
.hero .hero-badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-bottom: 28px; }
.badge {
  background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.22);
  color: #e8f2fb; border-radius: 999px; padding: 5px 14px; font-size: .85rem; font-weight: 600;
}
.btn {
  display: inline-block; text-decoration: none; font-weight: 700; border-radius: 10px;
  padding: 13px 26px; font-size: 1.02rem; border: none; cursor: pointer; transition: all .15s;
}
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); transform: translateY(-1px); }
.btn-ghost { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.35); margin-left: 10px; }
.btn-ghost:hover { background: rgba(255,255,255,.2); }
.btn-blue { background: var(--navy-3); color: #fff; }
.btn-blue:hover { background: var(--navy-2); }

/* ---------- sections / cards ---------- */
section.block { padding: 46px 0; }
section.block.alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
h2.section-title { font-size: 1.5rem; color: var(--navy); margin-bottom: 6px; }
p.section-sub { color: var(--muted); margin-bottom: 24px; }

.grid { display: grid; gap: 16px; }
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.card h3 { color: var(--navy); font-size: 1.08rem; margin-bottom: 6px; }
.card p { color: var(--muted); font-size: .93rem; flex: 1; }
.card .meta { color: var(--sky); font-weight: 700; font-size: .8rem; text-transform: uppercase; letter-spacing: .6px; margin-bottom: 8px; }
.card a.card-btn {
  margin-top: 14px; align-self: flex-start; text-decoration: none; font-weight: 700;
  color: var(--navy-3); font-size: .95rem;
}
.card a.card-btn:hover { color: var(--orange-dark); }
a.card-link { text-decoration: none; }

/* ---------- quiz engine ---------- */
#quiz-root { max-width: 780px; margin: 0 auto; }
.quiz-shell {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 26px; margin: 26px auto 40px;
}
.quiz-topbar { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; }
.quiz-topbar .qcount { font-weight: 700; color: var(--navy); }
.quiz-topbar .qtimer { font-variant-numeric: tabular-nums; font-weight: 800; color: var(--navy-3); background: var(--sky-soft); padding: 4px 12px; border-radius: 8px; }
.quiz-topbar .qtimer.low { color: #fff; background: var(--red); }
.progress { height: 8px; background: var(--line); border-radius: 99px; overflow: hidden; margin-bottom: 22px; }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--sky), var(--navy-3)); width: 0%; transition: width .25s; }

.qtext { font-size: 1.13rem; font-weight: 700; color: var(--ink); margin-bottom: 18px; line-height: 1.5; }
.opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
  text-align: left; background: #fff; border: 2px solid var(--line); border-radius: 10px;
  padding: 13px 16px; font-size: 1rem; cursor: pointer; transition: border-color .12s, background .12s;
  display: flex; gap: 10px; align-items: flex-start; line-height: 1.45;
}
.opt:hover { border-color: var(--sky); background: var(--sky-soft); }
.opt .letter { font-weight: 800; color: var(--navy-3); min-width: 1.2em; }
.opt.sel { border-color: var(--navy-3); background: var(--sky-soft); }
.opt.correct { border-color: var(--green); background: var(--green-soft); }
.opt.wrong { border-color: var(--red); background: var(--red-soft); }
.opt:disabled { cursor: default; }

.explain {
  margin-top: 16px; border-left: 4px solid var(--sky); background: var(--sky-soft);
  border-radius: 0 10px 10px 0; padding: 13px 16px; font-size: .95rem; color: var(--ink);
}
.explain .ref { display: block; margin-top: 6px; color: var(--muted); font-size: .84rem; font-weight: 600; }

.quiz-actions { margin-top: 20px; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.quiz-note { color: var(--muted); font-size: .88rem; margin-top: 12px; }

/* results */
.score-ring { text-align: center; margin: 8px 0 18px; }
.score-big { font-size: 3rem; font-weight: 800; }
.score-big.pass { color: var(--green); }
.score-big.fail { color: var(--red); }
.verdict { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.verdict.pass { color: var(--green); }
.verdict.fail { color: var(--red); }
.breakdown { margin: 18px 0; border-top: 1px solid var(--line); }
.breakdown .row { display: flex; justify-content: space-between; gap: 10px; padding: 9px 2px; border-bottom: 1px solid var(--line); font-size: .95rem; }
.breakdown .row .area { font-weight: 600; color: var(--navy); }
.review-item { border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; margin-bottom: 12px; background: #fff; }
.review-item .rq { font-weight: 700; margin-bottom: 6px; }
.review-item .ra { font-size: .92rem; margin: 2px 0; }
.review-item .ra.you { color: var(--red); }
.review-item .ra.key { color: var(--green); font-weight: 600; }
.review-item .rx { font-size: .88rem; color: var(--muted); margin-top: 6px; }

/* CTA block on results + pages */
.cta-box {
  background: linear-gradient(150deg, var(--navy), var(--navy-2)); color: #fff;
  border-radius: var(--radius); padding: 26px; text-align: center; margin: 26px 0;
}
.cta-box h3 { font-size: 1.25rem; margin-bottom: 8px; }
.cta-box p { color: #c9dcef; margin-bottom: 16px; font-size: .96rem; }

/* ---------- article / prose pages ---------- */
.prose { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: clamp(22px, 4vw, 42px); margin: 30px 0 46px; }
.prose h1 { color: var(--navy); font-size: clamp(1.5rem, 3.4vw, 2.1rem); line-height: 1.3; margin-bottom: 14px; }
.prose h2 { color: var(--navy); font-size: 1.32rem; margin: 30px 0 10px; }
.prose h3 { color: var(--navy-2); font-size: 1.1rem; margin: 22px 0 8px; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { margin: 0 0 16px 22px; }
.prose li { margin-bottom: 7px; }
.prose table { width: 100%; border-collapse: collapse; margin: 14px 0 20px; font-size: .93rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; vertical-align: top; }
.prose th { background: var(--sky-soft); color: var(--navy); }
.prose .tip { border-left: 4px solid var(--orange); background: #fff7ec; padding: 12px 16px; border-radius: 0 10px 10px 0; margin: 16px 0; font-size: .95rem; }
.prose .updated { color: var(--muted); font-size: .85rem; margin-bottom: 20px; }
.breadcrumb { font-size: .87rem; color: var(--muted); margin-top: 22px; }
.breadcrumb a { color: var(--muted); }

/* ---------- lead magnet form ---------- */
.lead-box { background: var(--card); border: 2px solid var(--navy-3); border-radius: var(--radius); padding: 28px; margin: 26px 0; box-shadow: var(--shadow); }
.lead-box h2 { color: var(--navy); margin-bottom: 8px; }
.lead-box .form-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }
.lead-box input[type="email"] {
  flex: 1; min-width: 220px; padding: 12px 14px; border: 2px solid var(--line);
  border-radius: 10px; font-size: 1rem;
}
.lead-box input[type="email"]:focus { outline: none; border-color: var(--sky); }
.checklist { list-style: none; margin: 14px 0 4px; }
.checklist li { padding-left: 28px; position: relative; margin-bottom: 9px; }
.checklist li::before { content: "✓"; position: absolute; left: 4px; color: var(--green); font-weight: 800; }

/* ---------- footer ---------- */
.site-footer { background: var(--navy); color: #9db8d4; padding: 34px 0 40px; margin-top: 20px; font-size: .88rem; }
.site-footer .cols { display: flex; flex-wrap: wrap; gap: 24px 48px; justify-content: space-between; }
.site-footer a { color: #cfe3f5; text-decoration: none; }
.site-footer a:hover { color: #fff; }
.site-footer .foot-links { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 10px; }
.site-footer .legal { max-width: 720px; line-height: 1.6; font-size: .8rem; color: #8aa5c2; }

/* faq */
details.faq { background: #fff; border: 1px solid var(--line); border-radius: 10px; padding: 14px 18px; margin-bottom: 10px; }
details.faq summary { font-weight: 700; color: var(--navy); cursor: pointer; }
details.faq p { margin-top: 10px; color: var(--muted); font-size: .95rem; }

@media (max-width: 560px) {
  .hero { padding: 40px 0 34px; }
  .btn-ghost { margin-left: 0; margin-top: 10px; }
  .quiz-shell { padding: 18px; }
}