/* ClapAssist coding test practice (rebuilt 2026-10-03). Uses the tokens from /tools/tools.css. */
.ct-app [hidden], .ct-wrap [hidden] { display: none !important; }
.sr { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.muted { color: var(--ink-3); }
.small { font-size: var(--fs-caption, 13px); }
.link-btn { background: none; border: 0; padding: 0; color: var(--accent-ink); font: inherit; text-decoration: underline; cursor: pointer; }
.ct-wrap { box-sizing: border-box; width: 100%; max-width: 1280px; min-width: 0; margin: 0 auto; padding: 0 var(--gutter, 20px) 40px; }
.ct-hero { max-width: 820px; margin: 8px 0 22px; }
.ct-hero h1 { font-size: clamp(30px, 4.2vw, 46px); line-height: 1.12; letter-spacing: -.02em; margin: 12px 0 14px; }
.ct-hero p { font-size: var(--fs-lead, 19px); line-height: 1.55; color: var(--ink-2); margin: 0; }

.ct-app { background: var(--surface); border: 1px solid var(--hair-2); border-radius: var(--r-lg); padding: 22px; box-shadow: var(--shadow-sm); scroll-margin-top: calc(var(--nav-h, 64px) + 12px); }
.ct-app h2 { margin: 0 0 6px; font-size: 22px; }
.ct-start { display: grid; gap: 14px; margin-bottom: 18px; }
.ct-start-main { background: var(--paper-2); border: 1px solid var(--hair); border-radius: var(--r-md); padding: 20px; }
.ct-sum { color: var(--ink-2); margin: 0 0 14px; }
.ct-start-btns { display: flex; flex-wrap: wrap; gap: 10px; margin: 6px 0 10px; }
.ct-langpick { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; font-size: 14px; color: var(--ink-2); }
.ct-langpick label, .ct-radio { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; min-height: 40px; }
.ct-langpick input, .ct-radio input { width: 18px; height: 18px; margin: 0; accent-color: var(--accent); }
.ct-radio { display: flex; margin: 4px 0; font-size: 15px; }
.ct-oa-setup { border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: var(--r-md); padding: 18px 20px; }
.ct-oa-setup h3 { margin: 0 0 6px; }
.ct-oa-live { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; padding: 12px 16px; border-radius: var(--r-md); background: var(--warn-soft); border: 1px solid var(--warn-line); }

.ct-filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 14px; }
.ct-filters input, .ct-filters select, .ct-ed-head select { font: 14px var(--sans); min-height: 40px; padding: 6px 10px; border-radius: var(--r-sm); border: 1px solid var(--hair-2); background: var(--surface); color: var(--ink); }
.ct-filters input { flex: 1 1 240px; width: auto; }
.ct-filters select, .ct-ed-head select { width: auto; flex: 0 1 auto; max-width: 100%; }
.ct-empty { padding: 14px; background: var(--paper-2); border-radius: var(--r-sm); }

.ct-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.ct-group { border: 1px solid var(--hair); border-radius: var(--r-md); padding: 12px 12px 6px; background: var(--surface); }
.ct-group h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 2px 6px 8px; }
.ct-group ol { list-style: none; margin: 0; padding: 0; }
.ct-group li button { width: 100%; display: grid; grid-template-columns: 28px minmax(0, 1fr) auto 58px; align-items: center; gap: 10px; text-align: left; background: none; border: 0; border-top: 1px solid var(--hair); padding: 9px 6px; min-height: 48px; font: 15px var(--sans); color: var(--ink); cursor: pointer; border-radius: 6px; }
.ct-group li:first-child button { border-top: 0; }
.ct-group li button:hover { background: var(--accent-soft); }
.ct-n { color: var(--ink-4); font-size: 13px; text-align: right; }
.ct-t { font-weight: 600; line-height: 1.3; }
.ct-t small { display: block; font-weight: 400; font-size: 12.5px; color: var(--ink-3); margin-top: 2px; }
.ct-st { font-size: 12px; font-weight: 600; text-align: right; }
li[data-st="solved"] .ct-st { color: var(--ok); }
li[data-st="tried"] .ct-st { color: var(--warn); }
li[data-st="solved"] .ct-n { color: var(--ok); }
.ct-diff { display: inline-block; font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: var(--r-pill); }
.ct-easy { background: var(--ok-soft); color: #15803d; }
.ct-medium { background: var(--warn-soft); color: #b45309; }
.ct-hard { background: var(--bad-soft); color: #be123c; }
.ct-hist { margin-top: 18px; }
.ct-hist h3 { margin: 0 0 6px; font-size: 16px; }
.ct-hist ul { margin: 0; padding-left: 18px; }
.ct-hist li { margin: 4px 0; }
.ct-data { margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--hair); }
.ct-data p { margin: 0 0 8px; color: var(--ink-3); }
.ct-data-btns { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }

/* solving */
.ct-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 14px; }
/* In a timed test the bar (tabs, clock, End test) stays in view under the site header while you scroll. */
.ct-oa-on .ct-bar { position: sticky; top: var(--nav-h, 64px); z-index: 20; background: var(--surface); padding: 8px 0; margin-top: -8px; border-bottom: 1px solid var(--hair); }
.ct-bar-r { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.ct-oa-tabs { display: flex; flex-wrap: wrap; gap: 6px; }
.ct-oa-tabs button { font: 600 13px var(--sans); min-height: 40px; padding: 6px 12px; border-radius: var(--r-sm); border: 1px solid var(--hair-2); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.ct-oa-tabs button[aria-current] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-ink); }
.ct-clock { font: 700 16px var(--mono); padding: 6px 12px; border-radius: var(--r-sm); background: var(--paper-2); }
.ct-clock.ct-low { background: var(--bad-soft); color: var(--bad); }
.ct-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 20px; align-items: start; }
.ct-desc { min-width: 0; font-size: 15.5px; line-height: 1.6; color: var(--ink-2); }
.ct-jump { display: none; font-size: 14px; font-weight: 600; color: var(--accent-ink); margin-bottom: 10px; }
.ct-title { font-size: 24px; color: var(--ink); margin: 0 0 8px; }
.ct-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.ct-pat, .ct-aka { font-size: 12px; font-weight: 600; padding: 2px 9px; border-radius: var(--r-pill); background: var(--paper-2); color: var(--ink-2); }
.ct-aka { font-weight: 500; color: var(--ink-3); }
.ct-desc h3 { font-size: 16px; color: var(--ink); margin: 18px 0 6px; }
.ct-desc code, .ct-content code { font: 0.92em var(--mono); background: var(--paper-2); padding: 1px 5px; border-radius: 4px; color: var(--ink); }
.ct-ex { margin: 12px 0; }
.ct-ex pre, .ct-io pre, .ct-logs pre, .ct-errbox { font: 13px/1.5 var(--mono); background: var(--paper-2); border: 1px solid var(--hair); border-radius: var(--r-sm); padding: 10px 12px; margin: 6px 0; white-space: pre-wrap; word-break: break-word; color: var(--ink); max-height: 220px; overflow: auto; }
.ct-ex p { margin: 4px 0 0; font-size: 14.5px; }
.ct-limits { margin: 0; padding-left: 20px; font-size: 14.5px; }
.ct-note { font-size: 14px; background: var(--accent-soft); border-radius: var(--r-sm); padding: 10px 12px; color: var(--accent-ink); }
.ct-oa-note { background: var(--warn-soft); color: #92400e; }
.ct-hints ol { padding-left: 20px; margin: 0 0 10px; }
.ct-hints li { margin: 6px 0; }
.ct-sol { margin-top: 16px; }
.ct-cx { margin: 0 0 6px; }
.ct-solcode { border: 1px solid var(--hair-2); border-radius: var(--r-sm); overflow: hidden; margin: 10px 0; }
.ct-solcode-h { display: flex; align-items: center; justify-content: space-between; padding: 6px 10px; background: var(--paper-2); font-size: 13px; font-weight: 600; }
.ct-solcode pre { margin: 0; padding: 12px; font: 13px/1.55 var(--mono); background: #1e1e2e; color: #e4e6f0; overflow: auto; }
.ct-err { color: var(--bad); }

.ct-code { min-width: 0; }
.ct-ed-head { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin-bottom: 8px; }
.ct-ed-head #ct-reset { margin-left: auto; }
.ct-editor, .ct-cm { height: 380px; border-radius: var(--r-sm); background: #fbfcfe; border: 1px solid var(--hair-2); overflow: hidden; }
.ct-editor { display: flex; }
.ct-cm .cm-editor { height: 100%; }
.ct-gutter { margin: 0; padding: 12px 8px 12px 10px; min-width: 40px; text-align: right; font: 14px/1.55 var(--mono); color: #8a93a6; background: #f2f4f8; border-right: 1px solid var(--hair-2); overflow: hidden; user-select: none; }
.ct-editor textarea { flex: 1; min-width: 0; margin: 0; border: 0; resize: none; outline: none; padding: 12px; font: 14px/1.55 var(--mono); color: var(--ink); background: transparent; white-space: pre; overflow: auto; tab-size: 4; }
.ct-editor:focus-within, .ct-cm:focus-within { box-shadow: 0 0 0 2px var(--accent); }
.ct-edhint { margin: 8px 0 0; padding: 8px 12px; border-radius: var(--r-sm); background: var(--warn-soft); border: 1px solid var(--warn-line); color: #5b3b00; font-size: 14.5px; }
.ct-target { font-size: 14.5px; margin: 12px 0 0; padding: 8px 12px; border-left: 3px solid var(--accent); background: var(--paper-2); border-radius: 0 var(--r-sm) var(--r-sm) 0; }
.ct-review { margin: 0 0 14px; padding: 12px 14px; border-radius: var(--r-md); background: var(--accent-soft); border: 1px solid var(--accent-line); }
.ct-review p { margin: 0 0 8px; }
.ct-review-box { border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: var(--r-md); padding: 14px 18px; }
.ct-review-box h3 { margin: 0 0 4px; font-size: 17px; }
.ct-review-box p { margin: 0 0 6px; }
.ct-review-box ul { margin: 4px 0 0; padding-left: 18px; }
.ct-review-box.ct-review-quiet { background: var(--paper-2); border-color: var(--hair); color: var(--ink-3); padding: 10px 16px; }
.ct-road-h { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 6px 0 8px; }
.ct-road { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 12px; }
.ct-road button { display: inline-flex; align-items: center; gap: 6px; min-height: 36px; padding: 4px 10px; border-radius: var(--r-pill); border: 1px solid var(--hair-2); background: var(--surface); color: var(--ink-2); font: 13px var(--sans); cursor: pointer; }
.ct-road button b { color: var(--ink); font-weight: 700; }
.ct-road button:hover, .ct-road button[aria-pressed="true"] { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-ink); }
.ct-road button.ct-road-done b { color: var(--ok); }
.ct-road-n { font-size: 11px; color: var(--ink-4); }
.ct-gc { float: right; text-transform: none; letter-spacing: 0; font-weight: 600; color: var(--ink-4); }
.ct-walk h4 { font-size: 15px; color: var(--ink); margin: 14px 0 4px; }
.ct-walk p, .ct-walk li { font-size: 15px; }
.ct-walk ol, .ct-walk ul { padding-left: 22px; margin: 4px 0; }
.ct-walk li { margin: 4px 0; }
.ct-walk-in { font: 13px/1.5 var(--mono); background: var(--paper-2); border: 1px solid var(--hair); border-radius: var(--r-sm); padding: 8px 10px; margin: 6px 0; white-space: pre-wrap; word-break: break-word; }
.ct-ai { margin: 14px 0 0; padding: 12px 14px; border: 1px dashed var(--hair-2); border-radius: var(--r-md); }
.ct-ai > p { margin: 6px 0 0; }
.ct-ai-case { margin: 4px 0 12px; }
.ct-ai-out:empty { display: none; }
.ct-ai-out { margin-top: 10px; padding: 10px 12px; background: var(--paper-2); border-radius: var(--r-sm); font-size: 15px; color: var(--ink); }
.ct-ai-out h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); margin: 8px 0 4px; }
.ct-ai-out p { margin: 4px 0; }
.ct-ai-out .ai-error { color: var(--bad); }
.ct-ai-out .ai-wait { color: var(--ink-3); }
.ct-keys { color: var(--ink-3); margin: 6px 0 10px; }
@media (hover: none) and (pointer: coarse) { .ct-keys { display: none; } }
.ct-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.ct-actions-r { display: flex; gap: 8px; margin-left: auto; }
.ct-custom { margin-top: 10px; }
.ct-custom label { font-weight: 600; font-size: 14px; }
.ct-custom textarea { display: block; width: 100%; box-sizing: border-box; margin-top: 6px; font: 13px/1.5 var(--mono); padding: 8px 10px; border-radius: var(--r-sm); border: 1px solid var(--hair-2); background: var(--surface); color: var(--ink); }
.ct-custom p { margin: 6px 0 0; }
.ct-results { margin-top: 14px; border-top: 1px solid var(--hair); padding-top: 12px; }
.ct-verdict { font-size: 19px; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.ct-good { color: var(--ok); }
.ct-bad { color: var(--bad); }
.ct-wait { color: var(--ink-2); }
.ct-skip { color: var(--ink-4); }
.ct-next-step { background: var(--ok-soft); padding: 8px 12px; border-radius: var(--r-sm); color: #166534; }
.ct-tle { background: var(--bad-soft); border: 1px solid #fecdd3; border-radius: var(--r-sm); padding: 10px 12px; margin: 8px 0; color: #881337; }
.ct-tle p { margin: 0; }
.ct-cases { list-style: none; margin: 10px 0 0; padding: 0; }
.ct-case { border: 1px solid var(--hair); border-radius: var(--r-sm); margin: 6px 0; padding: 0 12px; background: var(--surface); }
.ct-case summary { display: flex; align-items: center; gap: 8px; min-height: 40px; cursor: pointer; font-weight: 600; font-size: 14px; color: var(--ink); }
.ct-case summary .ct-st2 { margin-left: auto; font-weight: 600; font-size: 13px; }
.ct-case.ct-good .ct-st2 { color: var(--ok); }
.ct-case.ct-bad .ct-st2 { color: var(--bad); }
.ct-case.ct-skip .ct-st2 { color: var(--ink-4); }
.ct-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--ink-4); flex: none; }
.ct-good .ct-dot { background: var(--ok); }
.ct-bad .ct-dot { background: var(--bad); }
.ct-io span, .ct-logs span { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .05em; color: var(--ink-3); }
.ct-case > p { margin: 4px 0 10px; }
.ct-io, .ct-logs { padding-bottom: 6px; }
.ct-spin { width: 16px; height: 16px; border: 2px solid var(--hair-2); border-top-color: var(--accent); border-radius: 50%; animation: ct-spin .8s linear infinite; }
@keyframes ct-spin { to { transform: rotate(360deg); } }
.ct-table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 14.5px; }
.ct-table th, .ct-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--hair); }
.ct-table th { font-size: 12.5px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; }
#v-result h2 { font-size: 24px; }

/* reading content */
.ct-content { max-width: 860px; margin: 48px auto 0; color: var(--ink-2); font-size: var(--fs-article, 17px); line-height: 1.65; }
.ct-content > h2 { font-size: 26px; color: var(--ink); margin: 40px 0 12px; }
.ct-steps, .ct-facts { padding-left: 22px; }
.ct-steps li, .ct-facts li { margin: 8px 0; }
.ct-patterns { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 14px; margin: 14px 0; }
.ct-patterns > div { background: var(--surface); border: 1px solid var(--hair-2); border-radius: var(--r-md); padding: 18px; }
.ct-patterns h3 { font-size: 17px; color: var(--ink); margin: 0 0 6px; }
.ct-patterns p { font-size: 15px; margin: 0; color: var(--ink-3); line-height: 1.55; }
.ct-content .split { margin: 40px 0; }
.ct-content .related { margin: 10px 0 36px; }

@media (max-width: 960px) {
  .ct-jump { display: inline-block; }
  .ct-grid { grid-template-columns: minmax(0, 1fr); }
  .ct-list { grid-template-columns: minmax(0, 1fr); }
  .ct-editor, .ct-cm { height: 340px; }
}
@media (max-width: 600px) {
  .ct-app { padding: 14px; border-radius: var(--r-md); }
  .ct-start-main { padding: 16px; }
  .ct-start-btns .btn { width: 100%; justify-content: center; }
  .ct-group li button { grid-template-columns: 24px minmax(0, 1fr) auto; }
  .ct-group li button .ct-st { grid-column: 2 / 4; text-align: left; }
  .ct-group li[data-st="new"] button .ct-st { display: none; }
  .ct-editor, .ct-cm { height: 320px; }
  /* 16px: iOS Safari zooms the page when a text box under 16px gets focus. */
  .ct-editor textarea, .ct-gutter { font-size: 16px; }
  .ct-cm { --ct-code-size: 16px; }
  .ct-custom textarea, .ct-filters input, .ct-filters select, .ct-ed-head select { font-size: 16px; }
  .ct-gc { float: none; display: block; margin-top: 2px; }
  /* Timed test on a phone: the sticky bar stays one or two short rows. */
  .ct-oa-on .ct-oa-tabs { flex-wrap: nowrap; overflow-x: auto; flex: 1 1 100%; min-width: 0; }
  .ct-oa-on .ct-oa-tabs button { min-height: 36px; padding: 4px 10px; white-space: nowrap; }
  .ct-oa-on .ct-bar { gap: 6px; }
  .ct-actions-r { width: 100%; }
  .ct-actions-r .btn { flex: 1; }
  .ct-table th:nth-child(2), .ct-table td:nth-child(2) { display: none; }
  .ct-content > h2 { font-size: 22px; }
}
.ct-start-btns .btn { white-space: normal; height: auto; text-align: left; }