/* File: lab.css | Version: v1.0 | Description: Shared layouts for StatsCove interactive lessons. */
.lesson-main { padding-top: 35px; padding-bottom: 84px; }
.lesson-back { display: inline-flex; align-items: center; gap: 9px; color: var(--muted, #657870); font-size: 13px; text-decoration: none; }
.lesson-back:hover { color: var(--ink, #17332f); }
.lesson-heading { display: flex; justify-content: space-between; gap: 32px; align-items: flex-end; margin: 35px 0 29px; }
.lesson-kicker { margin: 0 0 13px; font-size: 11px; font-weight: 650; text-transform: uppercase; letter-spacing: .13em; color: var(--accent, #28796a); }
.lesson-heading h1 { margin: 0; font-size: clamp(30px, 4vw, 46px); line-height: 1.14; letter-spacing: -.055em; font-weight: 500; }
.lesson-description { max-width: 640px; margin: 15px 0 0; font-size: 15px; line-height: 1.7; color: var(--muted, #657870); }
.lesson-formula { flex-shrink: 0; padding: 16px 21px; border: 1px solid var(--line, #dce3dd); border-radius: 10px; font-family: Georgia, serif; font-size: 21px; white-space: nowrap; }
.lesson-formula sub { font-size: 12px; }
.lesson-nav { display: flex; gap: 23px; border-bottom: 1px solid var(--line, #dce3dd); margin: 0 0 25px; overflow-x: auto; scrollbar-width: none; }
.lesson-nav a { font-size: 13px; font-weight: 500; white-space: nowrap; color: var(--muted, #657870); padding: 0 0 14px; text-decoration: none; border-bottom: 2px solid transparent; }
.lesson-nav a[aria-current="page"] { color: var(--ink, #17332f); border-color: var(--accent, #28796a); }
.lesson-nav a:hover { color: var(--ink, #17332f); }
.lab-panel { --lab-accent: #28796a; --lab-tint: #eff5f1; overflow: hidden; background: #fff; border: 1px solid var(--line, #dce3dd); border-radius: 15px; }
body[data-page="t"] .lab-panel { --lab-accent: #a56340; --lab-tint: #f9f3ed; }
.lab-workspace { display: grid; grid-template-columns: minmax(0, 1fr) 286px; }
.lab-chart-pane { padding: 25px 26px 19px; min-width: 0; }
.lab-chart-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 7px; }
.lab-chart-heading h2 { margin: 0; font-size: 14px; font-weight: 600; letter-spacing: -.015em; }
.lab-chart-tag { font-size: 11px; color: var(--muted, #657870); display: inline-flex; align-items: center; gap: 7px; }
.lab-chart-tag::before { content: ''; width: 7px; height: 7px; background: var(--lab-accent); border-radius: 50%; }
.lab-chart { width: 100%; height: 335px; }
.lab-caption { color: var(--muted, #657870); font-size: 11px; line-height: 1.6; margin: 0; max-width: 650px; }
.lab-controls { padding: 25px 25px 22px; background: #fbfcfa; border-left: 1px solid var(--line, #dce3dd); }
.lab-controls-heading { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; gap: 10px; }
.lab-controls-heading h2 { font-size: 13px; font-weight: 600; margin: 0; }
.lab-reset { font: inherit; font-size: 11px; color: var(--muted, #657870); background: transparent; border: 0; padding: 5px 0 5px 6px; cursor: pointer; }
.lab-reset:hover { color: var(--lab-accent); }
.lab-field { margin-bottom: 18px; }
.lab-field:last-of-type { margin-bottom: 0; }
.lab-field label { font-size: 11px; line-height: 1.5; font-weight: 500; color: var(--muted, #657870); display: block; margin-bottom: 7px; }
.lab-number-wrap { display: flex; align-items: center; border: 1px solid #dce3dd; border-radius: 6px; background: #fff; transition: border-color .15s; }
.lab-number-wrap:focus-within { border-color: var(--lab-accent); box-shadow: 0 0 0 2px color-mix(in srgb, var(--lab-accent) 13%, transparent); }
.lab-number-wrap span { width: 34px; text-align: center; color: var(--muted, #657870); font-family: Georgia, serif; font-size: 16px; }
.lab-number-wrap input { width: calc(100% - 34px); min-width: 0; border: 0; border-left: 1px solid #e7ece6; font: inherit; font-size: 14px; font-variant-numeric: tabular-nums; padding: 9px 10px; outline: 0; background: transparent; color: var(--ink, #17332f); }
.lab-range-heading { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 3px; }
.lab-range-heading label { margin-bottom: 0; }
.lab-range-heading output { font-size: 12px; color: var(--lab-accent); font-weight: 600; font-variant-numeric: tabular-nums; }
.lab-field input[type="range"] { --range-progress: 50%; display: block; width: 100%; height: 20px; margin: 8px 0 3px; accent-color: var(--lab-accent); cursor: pointer; }
.lab-range-scale { display: flex; justify-content: space-between; color: #809087; font-size: 10px; font-variant-numeric: tabular-nums; }
.lab-error { color: #a13a2b; font-size: 11px; line-height: 1.5; margin: 14px 0 0; }
.lab-error:empty { display: none; }
.lab-results { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); background: var(--lab-tint); border-top: 1px solid var(--line, #dce3dd); padding: 19px 26px; gap: 10px; }
.lab-results.normal-results { grid-template-columns: 1.4fr 1fr 1fr; }
.lab-results.t-results { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.lab-result { padding: 0 12px; border-left: 1px solid #dbe6de; min-width: 0; }
.lab-result:first-child { padding-left: 0; border-left: 0; }
.lab-result-label { display: block; font-size: 10px; line-height: 1.4; color: var(--muted, #657870); margin-bottom: 7px; }
.lab-result-value { display: block; font-variant-numeric: tabular-nums; font-size: 24px; line-height: 1.05; font-weight: 500; letter-spacing: -.035em; color: var(--ink, #17332f); overflow-wrap: anywhere; }
.lab-result:first-child .lab-result-value { color: var(--lab-accent); }
.lab-panel[data-stale="true"] .lab-results { opacity: .5; }
.lab-accessible-summary { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.lesson-notes { display: grid; grid-template-columns: 1.12fr 1fr; column-gap: 70px; padding: 36px 0 32px; }
.lesson-notes h2 { font-size: 17px; font-weight: 500; letter-spacing: -.025em; margin: 0 0 13px; }
.lesson-notes p { font-size: 13px; line-height: 1.8; margin: 0; color: var(--muted, #657870); }
.lesson-notes p + p { margin-top: 10px; }
.lesson-notes strong { color: var(--ink, #17332f); font-weight: 550; }
.lesson-try { border-left: 1px solid var(--line, #dce3dd); padding-left: 35px; }
.lesson-try h2 { display: flex; align-items: center; gap: 9px; }
.lesson-try h2 span { font-size: 10px; font-weight: 600; border: 1px solid #c7d8ca; color: var(--accent, #28796a); border-radius: 4px; padding: 3px 5px; letter-spacing: .02em; }
.lab-action { display: inline-flex; margin-top: 15px; align-items: center; gap: 9px; font: inherit; font-size: 11px; font-weight: 550; color: var(--accent, #28796a); background: transparent; padding: 0 0 4px; border: 0; border-bottom: 1px solid #a3c4b7; cursor: pointer; }
.lab-action:hover { color: var(--ink, #17332f); }
.lesson-details { border-top: 1px solid var(--line, #dce3dd); border-bottom: 1px solid var(--line, #dce3dd); }
.lesson-details summary { cursor: pointer; font-size: 12px; font-weight: 500; padding: 18px 0; list-style-position: outside; margin-left: 15px; }
.lesson-details-content { max-width: 850px; padding: 0 0 20px; color: var(--muted, #657870); font-size: 12px; line-height: 1.85; }
.lesson-details-content p { margin: 0 0 9px; }
.lesson-details-content p:last-child { margin-bottom: 0; }
.lesson-details-content a { color: var(--accent, #28796a); text-underline-offset: 3px; }
.lesson-next { display: flex; align-items: center; justify-content: space-between; padding-top: 27px; gap: 20px; }
.lesson-next span { font-size: 11px; color: var(--muted, #657870); }
.lesson-next a { color: var(--ink, #17332f); font-size: 12px; text-decoration: none; display: inline-flex; gap: 12px; }
.lesson-next a:hover { color: var(--accent, #28796a); }
.lab-fallback { padding: 80px 30px; text-align: center; font-size: 13px; color: var(--muted, #657870); }
@media (max-width: 900px) {
  .lesson-formula { font-size: 17px; padding: 14px; }
  .lab-workspace { grid-template-columns: minmax(0, 1fr) 255px; }
  .lab-chart-pane { padding: 22px 17px 18px; }
  .lab-controls { padding: 22px 19px; }
  .lesson-notes { gap: 34px; }
  .lesson-try { padding-left: 28px; }
}
@media (max-width: 700px) {
  .lesson-main { padding-top: 26px; padding-bottom: 54px; }
  .lesson-heading { display: block; margin: 28px 0 25px; }
  .lesson-heading h1 { font-size: 35px; }
  .lesson-description { font-size: 14px; }
  .lesson-formula { display: inline-block; margin-top: 18px; padding: 10px 15px; font-size: 17px; border-radius: 7px; }
  .lesson-nav { gap: 20px; margin-bottom: 20px; }
  .lesson-nav a { font-size: 12px; }
  .lab-workspace { grid-template-columns: minmax(0, 1fr); }
  .lab-chart-pane { padding: 20px 14px 18px; }
  .lab-chart { height: 270px; }
  .lab-chart-heading { padding: 0 5px; }
  .lab-chart-heading h2 { font-size: 13px; }
  .lab-chart-tag { font-size: 10px; }
  .lab-caption { padding: 0 5px; }
  .lab-controls { border-left: 0; border-top: 1px solid var(--line, #dce3dd); padding: 20px; }
  .lab-controls-heading { margin-bottom: 17px; }
  .lab-controls-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: 20px; row-gap: 18px; }
  .lab-field { margin: 0; }
  .lab-field.cutoff-field { grid-column: 1 / -1; }
  .lab-results { padding: 20px; gap: 19px 10px; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lab-results.t-results { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .lab-results.normal-results { grid-template-columns: 1.2fr 1fr 1fr; gap: 5px; }
  .lab-result { padding: 0 9px; }
  .lab-result:nth-child(3):not(.t-results .lab-result):not(.normal-results .lab-result) { padding-left: 0; border-left: 0; }
  .t-results .lab-result:nth-child(4) { padding-left: 0; border-left: 0; }
  .lab-result-value { font-size: 21px; }
  .normal-results .lab-result-value { font-size: 23px; }
  .lab-result-label { font-size: 9px; }
  .lesson-notes { grid-template-columns: minmax(0, 1fr); padding: 30px 0; gap: 27px; }
  .lesson-try { padding-left: 0; border-left: 0; }
  .lesson-next { align-items: flex-start; }
  .lesson-next a { text-align: right; }
}
@media (prefers-reduced-motion: reduce) {
  .lab-number-wrap { transition: none; }
}
/* Keep the shared range styling compact and adapt the t lesson accent. */
.lab-field input[type="range"] { height: 4px; padding: 0; margin: 13px 0 11px; }
.lab-field input[type="range"]::-webkit-slider-thumb { background: var(--lab-accent); box-shadow: 0 0 0 1px var(--lab-accent); }
.lab-field input[type="range"]::-moz-range-thumb { background: var(--lab-accent); box-shadow: 0 0 0 1px var(--lab-accent); }