/* TIMO Primary 5 Trainer — light, kid-friendly styles. No frameworks. */
:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1c2333;
  --muted: #6b7280;
  --brand: #243b8b;
  --brand-soft: #e3e9fb;
  --ok: #15803d;
  --ok-bg: #e7f6ec;
  --bad: #b91c1c;
  --bad-bg: #fdecec;
  --line: #e2e6f0;
  --radius: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 19px;
  line-height: 1.55;
}
.wrap { max-width: 860px; margin: 0 auto; padding: 18px 16px 60px; }
.topbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 14px;
}
.logo {
  font-weight: 800; font-size: 22px; color: var(--brand);
  letter-spacing: .2px;
}
.badge {
  display: inline-block; background: var(--brand-soft); color: var(--brand);
  border-radius: 999px; padding: 2px 12px; font-size: 15px; font-weight: 700;
}
.spacer { flex: 1; }
.btn {
  font-size: 18px; font-weight: 700;
  border: 2px solid var(--brand); background: #fff; color: var(--brand);
  border-radius: 12px; padding: 10px 18px; cursor: pointer;
}
.btn:hover { background: var(--brand-soft); }
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { border-color: var(--line); color: var(--ink); }
.btn.small { font-size: 16px; padding: 7px 12px; }
.btn:disabled { opacity: .45; cursor: default; }
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; margin: 12px 0;
  box-shadow: 0 1px 3px rgba(20,30,80,.06);
}
h1 { font-size: 30px; margin: 8px 0; }
h2 { font-size: 24px; margin: 6px 0; }
h3 { font-size: 20px; margin: 6px 0; }
.muted { color: var(--muted); }
.stage-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.stage-head .no { font-weight: 800; color: var(--brand); }
.ru-name {
  display: inline-block; margin-top: 6px; font-size: 17px; color: var(--muted);
  border-bottom: 1px dashed var(--muted); cursor: pointer; user-select: none;
}
.ru-name .hidden-ru { display: none; }
.ru-name.open .hidden-ru { display: inline; }
.segments { display: flex; gap: 6px; margin: 14px 0 4px; }
.seg {
  flex: 1; height: 12px; border-radius: 6px; background: #dde3f0;
}
.seg.ok { background: var(--ok); }
.seg.wrong { background: var(--bad); }
.seg.skip { background: #b6bdd0; }
.seg.now { outline: 3px solid var(--brand); outline-offset: 1px; }
.qtext { font-size: 21px; }
.figure { margin: 12px 0; text-align: center; }
.figure svg { max-width: 100%; height: auto; }
.answer-row { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.answer-row input {
  flex: 1; min-width: 220px; font-size: 20px; padding: 12px 14px;
  border: 2px solid var(--line); border-radius: 12px;
}
.answer-row input:focus { outline: none; border-color: var(--brand); }
.feedback { border-radius: 12px; padding: 14px 16px; margin-top: 14px; font-size: 19px; }
.feedback.ok { background: var(--ok-bg); border: 2px solid var(--ok); }
.feedback.bad { background: var(--bad-bg); border: 2px solid var(--bad); }
.feedback .verdict { font-weight: 800; font-size: 22px; }
.solution { margin-top: 10px; }
.solution ol { margin: 8px 0 8px 22px; padding: 0; }
.solution li { margin: 4px 0; }
.solution summary, details.hint summary { cursor: pointer; font-weight: 700; color: var(--brand); }
.nav-row { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.stage-cell {
  background: #fff; border: 2px solid var(--line); border-radius: 12px;
  padding: 10px; cursor: pointer; text-align: left; font-size: 16px;
}
.stage-cell .t { font-weight: 800; color: var(--brand); }
.stage-cell .s { font-size: 13px; color: var(--muted); }
.stage-cell:disabled { opacity: .45; cursor: default; }
.stage-cell.done { border-color: var(--ok); }
.toolbar { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; font-size: 17px; }
select, .toolbar input[type="number"] { font-size: 17px; padding: 6px 8px; border-radius: 8px; border: 2px solid var(--line); }
.timer { font-weight: 800; font-size: 20px; color: var(--brand); font-variant-numeric: tabular-nums; }
.timer.low { color: var(--bad); }
table.mini { border-collapse: collapse; margin: 8px 0; font-size: 18px; }
table.mini td, table.mini th { border: 1px solid var(--line); padding: 4px 10px; text-align: center; }
table.mini tr.hit td { background: var(--ok-bg); font-weight: 700; }
.pill { display: inline-block; border-radius: 999px; padding: 1px 10px; font-size: 14px; font-weight: 700; background: var(--brand-soft); color: var(--brand); margin-left: 6px;}

/* Optional lessons: native details keeps keyboard and touch access simple. */
.theory { margin: 20px 0 16px; border: 1px solid #cad4ef; border-radius: 10px; overflow: hidden; }
.theory > summary { padding: 14px 16px; cursor: pointer; color: var(--brand); background: #f0f3fc; font-size: 18px; font-weight: 700; }
.theory > summary:hover { background: var(--brand-soft); }
.theory > summary:focus-visible { outline: 3px solid var(--brand); outline-offset: -3px; }
.theory-summary-note { display: block; margin: 3px 0 0 20px; font-size: 15px; font-weight: 400; color: #4b5875; }
.theory-body { padding: 18px; font-size: 18px; line-height: 1.6; }
.theory-body h3 { margin: 0 0 8px; font-size: 19px; }
.theory-body p { margin: 0 0 16px; }
.theory-body ol { margin: 8px 0 20px; padding-left: 25px; }
.theory-body li { margin: 0 0 10px; padding-left: 4px; }
.theory-body li::marker { color: var(--brand); font-weight: 700; }
.theory-example { margin: 18px 0; padding: 16px; background: #f7f8fc; border-left: 3px solid #a7b6df; }
.theory-example ol { margin-bottom: 10px; }
.theory-figure { max-width: 420px; margin: 16px auto 0; }
.theory-figure svg { display: block; width: 100%; height: auto; }
.theory-table { overflow-x: auto; }
.theory-table table { border-collapse: collapse; width: 100%; font-size: 16px; }
.theory-table caption { text-align: left; margin-bottom: 8px; color: #4b5875; }
.theory-table th, .theory-table td { border-bottom: 1px solid var(--line); padding: 8px; text-align: center; }
.theory-table tbody tr:last-child { background: var(--ok-bg); }
.theory-body .theory-remember { margin-bottom: 0; }
@media (max-width: 480px) {
  .theory > summary { padding: 12px; font-size: 17px; }
  .theory-body { padding: 14px; font-size: 17px; }
  .theory-example { padding: 12px; }
}