:root {
  --ink: #10243a; --text: #1f2d3d; --muted: #5b6b7c; --line: #dfe5ec; --bg: #f6f8fa; --card: #fff;
  --accent: #e8590c; --accent-dark: #c2410c; --ok: #15803d; --no: #b91c1c; --ok-bg: #ecfdf3; --no-bg: #fef2f2;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--text); background: var(--bg); }
a { color: #0b5cad; }
main, .top, .foot { max-width: 940px; margin: 0 auto; padding: 0 16px; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 14px; padding-bottom: 14px; flex-wrap: wrap; }
.brand { font-size: 20px; font-weight: 700; color: var(--ink); text-decoration: none; }
.brand b { color: var(--accent); }
.mark { display: inline-grid; place-items: center; width: 26px; height: 26px; border-radius: 6px; background: var(--accent); color: #fff; font-size: 16px; }
.top nav { display: flex; gap: 16px; }
.top nav a { color: var(--ink); text-decoration: none; font-weight: 600; }
h1 { font-size: clamp(28px, 5vw, 42px); line-height: 1.15; color: var(--ink); margin: 0 0 12px; }
h2 { font-size: 24px; color: var(--ink); margin: 36px 0 12px; }
h3 { font-size: 18px; color: var(--ink); margin: 0 0 6px; }
.hero { padding: 40px 0 8px; }
.hero.small { padding-top: 20px; }
.lede { font-size: 19px; color: var(--muted); max-width: 720px; }
.kicker { font-size: 14px; color: var(--muted); margin: 0 0 8px; }
.kicker a { color: var(--muted); }
.muted, .meta { color: var(--muted); }
.meta, .small { font-size: 14px; }
.btn { display: inline-block; background: var(--accent); color: #fff; border: 2px solid var(--accent); border-radius: 10px; padding: 11px 18px; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; }
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn:disabled { opacity: 0.6; cursor: default; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.small { padding: 7px 12px; font-size: 15px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.trade { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; text-decoration: none; color: var(--text); }
.trade.live { border-left: 5px solid var(--accent); }
.trade:hover { border-color: var(--accent); }
.trade p { margin: 0 0 8px; font-size: 15px; }
.trade .meta { margin: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 20px; margin: 24px 0; }
.card h2 { margin-top: 0; }
.beta { background: #fff7ed; border: 1px solid #fed7aa; border-radius: 10px; padding: 10px 14px; font-size: 15px; }
.tag { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; background: var(--ok-bg); color: var(--ok); border-radius: 999px; padding: 3px 9px; vertical-align: middle; }
.tag.soon { background: #eef2f6; color: var(--muted); }
.how ol { padding-left: 22px; }
.how li { margin-bottom: 8px; }
table.exams { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); border-radius: 12px; font-size: 15px; display: block; overflow-x: auto; }
table.exams th, table.exams td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.exams th { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: 0.04em; }
table.exams td:first-child { min-width: 220px; }
.topics, .cols { padding-left: 20px; columns: 2; column-gap: 32px; }
.topics li, .cols li { margin-bottom: 6px; break-inside: avoid; }
.sample { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px 20px; margin: 12px 0; }
.q { font-size: 18px; font-weight: 600; color: var(--ink); }
ol.choices { padding-left: 26px; }
details summary { cursor: pointer; color: #0b5cad; font-weight: 600; }
/* practice test */
.quiz .bar { height: 6px; background: #e9eef3; border-radius: 3px; overflow: hidden; }
.quiz .bar i { display: block; height: 100%; background: var(--accent); transition: width 0.3s; }
.progress { font-size: 14px; color: var(--muted); margin: 10px 0 0; }
div.choices { display: grid; gap: 8px; }
.choice { display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%; background: #fff; border: 2px solid var(--line); border-radius: 10px; padding: 12px 14px; font: inherit; color: var(--text); cursor: pointer; }
.choice b { flex: none; width: 26px; height: 26px; display: grid; place-items: center; border-radius: 50%; background: #eef2f6; color: var(--ink); font-size: 14px; }
.choice:hover:not(:disabled) { border-color: var(--accent); }
.choice:disabled { cursor: default; color: var(--text); }
.choice.right { border-color: var(--ok); background: var(--ok-bg); }
.choice.wrong { border-color: var(--no); background: var(--no-bg); }
.numeric { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.numeric input { width: 160px; }
.unit { color: var(--muted); }
.result { margin-top: 14px; }
.verdict { font-weight: 800; font-size: 18px; margin: 0 0 6px; }
.verdict.ok { color: var(--ok); }
.verdict.no { color: var(--no); }
.score { font-size: 28px; font-weight: 800; color: var(--ink); margin: 0 0 8px; }
.report-wrap { margin-top: 14px; font-size: 15px; }
.err { color: var(--no); }
/* forms */
label { display: block; font-weight: 600; margin-bottom: 12px; }
input, textarea { display: block; width: 100%; margin-top: 6px; padding: 10px 12px; border: 1px solid #c4ced9; border-radius: 8px; font: inherit; background: #fff; color: var(--text); }
input:focus, textarea:focus, .btn:focus-visible, .choice:focus-visible { outline: 3px solid #93c5fd; outline-offset: 1px; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status { min-height: 1.4em; margin: 8px 0 0; color: var(--muted); }
.prose { max-width: 720px; padding-top: 20px; }
.foot { margin-top: 48px; padding-top: 20px; padding-bottom: 32px; border-top: 1px solid var(--line); font-size: 14px; color: var(--muted); }
@media (max-width: 600px) { .topics, .cols { columns: 1; } body { font-size: 16px; } }