:root {
  --wall: #E9ECF1; --card: #FFFFFF; --ink: #12213F; --navy: #1B365D; --muted: #4B5563;
  --line: #C7CFDB; --accent: #0072B2; --accent-ink: #FFFFFF; --hover: #EEF4FB;
  --good: #007A5A; --good-bg: #E3F4EE; --bad: #B23A00; --bad-bg: #FBEDE5; --warn: #8A5A00;
  --body: "Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --wall: #0C1526; --card: #15223A; --ink: #EEF2F8; --navy: #A9C4EC; --muted: #B7C1D1;
    --line: #33476B; --accent: #56B4E9; --accent-ink: #06121F; --hover: #1E304F;
    --good: #3FC79E; --good-bg: #123A30; --bad: #FF8A4C; --bad-bg: #3D2014; --warn: #F0B43C;
  }
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--wall); color: var(--ink); font: 400 18px/1.5 var(--body); }
h1, h2 { color: var(--navy); line-height: 1.2; margin: 0 0 .5em; }
h1 { font-size: 2.2rem; }
h2 { font-size: 1.4rem; }
h2:focus { outline: none; }
p { margin: 0 0 .9em; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

.quiz { max-width: 680px; margin: 0 auto; padding: 32px 16px; }
.card { background: var(--card); border-radius: 14px; padding: 28px 24px; box-shadow: 0 2px 10px rgba(0,0,0,.08); }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; font-weight: 700; color: var(--muted); margin-bottom: .4em; }
.muted { color: var(--muted); font-size: .95rem; }
.warn { color: var(--warn); font-weight: 700; }

.primary { background: var(--accent); color: var(--accent-ink); border: 0; border-radius: 10px; padding: .7em 1.4em; font-weight: 700; margin-top: .4em; }
.primary:disabled { opacity: .5; cursor: default; }

.progress { height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; margin-bottom: 18px; }
#bar { height: 100%; width: 0; background: var(--accent); transition: width .3s; }

.options { display: grid; gap: 10px; margin: 18px 0; }
.option { text-align: left; background: var(--card); color: var(--ink); border: 2px solid var(--line); border-radius: 10px; padding: .75em 1em; }
.option:not(:disabled):hover { background: var(--hover); border-color: var(--accent); }
.option:disabled { cursor: default; opacity: .7; }
.option.correct { border-color: var(--good); background: var(--good-bg); opacity: 1; }
.option.wrong { border-color: var(--bad); background: var(--bad-bg); opacity: 1; }

.feedback { border-left: 5px solid var(--line); padding: .6em 1em; margin-bottom: 14px; border-radius: 4px; }
.feedback.good { border-color: var(--good); background: var(--good-bg); }
.feedback.bad { border-color: var(--bad); background: var(--bad-bg); }
.feedback p:last-child { margin-bottom: 0; }
.verdict { font-weight: 700; }

.site-footer { text-align: center; color: var(--muted); font-size: .9rem; padding: 0 16px 24px; }

/* Results page */
.results { max-width: 900px; margin: 0 auto; padding: 32px 16px; }
.stats { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.stat { background: var(--card); border-radius: 12px; padding: 16px 20px; min-width: 180px; color: var(--muted); }
.big { display: block; font-size: 2rem; font-weight: 700; color: var(--navy); }
.results h2 { margin-top: 1.4em; }
.scroll { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; background: var(--card); border-radius: 8px; font-size: .95rem; }
th, td { text-align: left; padding: .5em .75em; border-bottom: 1px solid var(--line); vertical-align: top; }
.num { text-align: right; white-space: nowrap; }