:root {
  --labs-ink: #171713;
  --labs-muted: #68685e;
  --labs-paper: #f4f1e9;
  --labs-card: #fffdf7;
  --labs-line: #d7d2c7;
  --labs-accent: #dfff57;
  --labs-blue: #4338ca;
  --labs-radius: 22px;
}

* { box-sizing: border-box; }

body.ai-labs-theme {
  margin: 0;
  color: var(--labs-ink);
  background: var(--labs-paper);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

.ai-labs-theme a { color: inherit; }
.labs-wrap { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }

.labs-nav {
  min-height: 72px;
  padding: 14px max(20px, calc((100vw - 1180px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--labs-line);
  background: color-mix(in srgb, var(--labs-paper) 90%, transparent);
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.labs-nav nav { display: flex; align-items: center; gap: 24px; }
.labs-nav a { text-decoration: none; font-weight: 650; }
.labs-nav nav a:hover, .labs-nav nav a:focus-visible { text-decoration: underline; text-underline-offset: 5px; }
.labs-brand { display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 800; text-decoration: none; }
.labs-brand > span { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 10px; background: var(--labs-ink); color: var(--labs-accent); }

.labs-hero { padding-block: clamp(78px, 11vw, 150px) 80px; }
.labs-hero h1, .labs-assessment h1 { max-width: 900px; margin: 14px 0 24px; font-size: clamp(48px, 7.7vw, 108px); line-height: .9; letter-spacing: -.07em; }
.labs-kicker { margin: 0; color: var(--labs-blue); font-size: 12px; font-weight: 850; letter-spacing: .14em; }
.labs-lead { max-width: 740px; color: var(--labs-muted); font-size: clamp(19px, 2vw, 26px); line-height: 1.45; }

.labs-button {
  min-height: 50px;
  padding: 13px 20px;
  border: 1px solid var(--labs-ink);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: var(--labs-ink);
  color: white !important;
  font: inherit;
  font-weight: 750;
  text-decoration: none;
  cursor: pointer;
}
.labs-button:hover { transform: translateY(-1px); }
.labs-button:focus-visible { outline: 3px solid var(--labs-blue); outline-offset: 3px; }
.labs-button:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.labs-button--secondary { background: transparent; color: var(--labs-ink) !important; }

.labs-track-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; padding-bottom: 110px; }
.labs-track-card { min-height: 480px; padding: clamp(28px, 4vw, 52px); border: 1px solid var(--labs-line); border-radius: var(--labs-radius); display: flex; flex-direction: column; background: var(--labs-card); }
.labs-track-card--labs { background: var(--labs-ink); color: white; }
.labs-track-card--labs .labs-kicker { color: var(--labs-accent); }
.labs-track-card h2 { margin: 20px 0; max-width: 560px; font-size: clamp(36px, 4vw, 60px); line-height: 1; letter-spacing: -.045em; }
.labs-track-card p, .labs-track-card li { color: inherit; opacity: .78; font-size: 18px; }
.labs-track-card ul { padding-left: 20px; margin-bottom: 32px; }
.labs-track-card .labs-button { margin-top: auto; align-self: flex-start; }
.labs-track-card--labs .labs-button { color: var(--labs-ink) !important; background: var(--labs-accent); border-color: var(--labs-accent); }

.labs-section-heading { max-width: 760px; margin-bottom: 42px; }
.labs-section-heading h2, .labs-pricing h2, .labs-lesson-section h2, .labs-certificate-form h2 { margin: 12px 0; font-size: clamp(34px, 5vw, 66px); line-height: 1; letter-spacing: -.05em; }
.labs-current, .labs-coming { padding-block: 80px 120px; }
.labs-course-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.labs-course-card { min-height: 240px; padding: 24px; border-top: 2px solid var(--labs-ink); background: var(--labs-card); }
.labs-course-card > span { color: var(--labs-blue); font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.labs-course-card h3 { margin: 50px 0 10px; font-size: 24px; line-height: 1.15; letter-spacing: -.025em; }
.labs-course-card p { color: var(--labs-muted); }

.labs-hero--course { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(330px, .75fr); align-items: center; gap: clamp(40px, 7vw, 100px); }
.labs-hero--course h1 { font-size: clamp(54px, 7vw, 96px); }
.labs-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.labs-proof-list { display: flex; flex-wrap: wrap; gap: 12px 28px; padding: 0; margin: 32px 0 0; color: var(--labs-muted); list-style: none; }
.labs-proof-list li::before { content: "✓"; margin-right: 8px; color: var(--labs-blue); font-weight: 900; }
.labs-agent-card { padding: 28px; border-radius: var(--labs-radius); background: var(--labs-ink); color: white; box-shadow: 0 24px 70px rgb(29 27 20 / .18); transform: rotate(1.3deg); }
.labs-agent-card > div { font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.labs-status-dot { width: 8px; height: 8px; display: inline-block; margin-right: 6px; border-radius: 50%; background: var(--labs-accent); }
.labs-agent-card h2 { margin: 34px 0; font-size: 34px; line-height: 1.05; letter-spacing: -.04em; }
.labs-agent-card ol { padding: 0; list-style: none; }
.labs-agent-card li { padding: 15px 0; border-top: 1px solid rgb(255 255 255 / .18); display: flex; justify-content: space-between; gap: 20px; }
.labs-agent-card small { color: #b8b7ad; }
.labs-agent-card > p { margin: 25px 0 0; color: var(--labs-accent); font-size: 13px; }

.labs-pricing { padding-block: 100px; display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(40px, 8vw, 120px); border-block: 1px solid var(--labs-line); }
.labs-pricing > div:first-child > p:last-child { color: var(--labs-muted); font-size: 18px; }
.labs-plan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.labs-plan-grid article { min-height: 330px; padding: 28px; border: 1px solid var(--labs-line); border-radius: var(--labs-radius); display: flex; flex-direction: column; background: var(--labs-card); }
.labs-plan-grid article > p { margin: 0; font-weight: 800; }
.labs-plan-grid strong { margin: 36px 0 0; font-size: 52px; line-height: 1; letter-spacing: -.05em; }
.labs-plan-grid strong small { font-size: 16px; letter-spacing: 0; }
.labs-plan-grid article > span { color: var(--labs-muted); }
.labs-plan-grid .labs-button { margin-top: auto; width: 100%; }
.labs-plan--featured { border-color: var(--labs-blue) !important; box-shadow: inset 0 0 0 1px var(--labs-blue); }
.labs-notice, .labs-inline-status { grid-column: 1 / -1; }
.labs-notice { padding: 14px 18px; border-radius: 12px; background: #fff2bf; }

.labs-role-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; padding-bottom: 120px; }
.labs-role-grid article { min-height: 230px; padding: 22px; border-left: 1px solid var(--labs-line); }
.labs-role-grid p { color: var(--labs-blue); font-size: 11px; font-weight: 800; letter-spacing: .08em; }
.labs-role-grid h3 { margin-top: 70px; font-size: 19px; line-height: 1.3; }
.labs-curriculum { padding-block: 110px; }
.labs-curriculum ol { padding: 0; border-top: 1px solid var(--labs-line); list-style: none; }
.labs-curriculum li { border-bottom: 1px solid var(--labs-line); }
.labs-curriculum a { padding: 24px 4px; display: grid; grid-template-columns: 50px 1fr auto; align-items: start; gap: 20px; text-decoration: none; }
.labs-curriculum a:hover h3 { text-decoration: underline; text-underline-offset: 5px; }
.labs-curriculum a > span { color: var(--labs-blue); font-weight: 850; }
.labs-curriculum h3 { margin: 0; font-size: 24px; }
.labs-curriculum p { margin: 6px 0 0; color: var(--labs-muted); }
.labs-curriculum small { color: var(--labs-muted); white-space: nowrap; }

.labs-footer { min-height: 100px; padding: 30px max(20px, calc((100vw - 1180px) / 2)); border-top: 1px solid var(--labs-line); display: flex; justify-content: space-between; align-items: center; }
.labs-footer span:last-child { display: flex; gap: 20px; }

.labs-nav--lesson { position: relative; }
.labs-lesson-shell { max-width: 1480px; margin: auto; display: grid; grid-template-columns: 300px minmax(0, 1fr); }
.labs-lesson-rail { height: calc(100vh - 72px); padding: 30px 24px; border-right: 1px solid var(--labs-line); position: sticky; top: 0; overflow: auto; }
.labs-lesson-rail > p { font-size: 11px; font-weight: 850; letter-spacing: .1em; }
.labs-lesson-rail ol { padding: 0; list-style: none; }
.labs-lesson-rail a { padding: 9px 0; display: grid; grid-template-columns: 28px 1fr; gap: 8px; color: var(--labs-muted); font-size: 13px; text-decoration: none; }
.labs-lesson-rail a:hover { color: var(--labs-ink); }
.labs-lesson-rail a span { color: var(--labs-blue); font-weight: 800; }
.labs-lesson-main { width: min(860px, calc(100% - 48px)); margin: 0 auto; padding-block: 70px 100px; }
.labs-lesson-main > h1 { margin: 14px 0 24px; font-size: clamp(46px, 6vw, 78px); line-height: .98; letter-spacing: -.055em; }
.labs-lesson-section { padding-block: 70px; border-top: 1px solid var(--labs-line); }
.labs-lesson-section > p:not(.labs-kicker) { color: var(--labs-muted); font-size: 20px; }
.labs-callout { margin-top: 28px; padding: 20px; border-left: 4px solid var(--labs-blue); display: grid; gap: 6px; background: var(--labs-card); }
.labs-choice-list { display: grid; gap: 10px; }
.labs-choice-list button { padding: 18px; border: 1px solid var(--labs-line); border-radius: 14px; display: grid; grid-template-columns: 34px 1fr; align-items: center; text-align: left; background: var(--labs-card); color: inherit; font: inherit; cursor: pointer; }
.labs-choice-list button > span { width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center; background: var(--labs-paper); text-transform: uppercase; }
.labs-choice-list button:hover, .labs-choice-list button:focus-visible { border-color: var(--labs-blue); outline: none; }
.labs-choice-list button[data-state="correct"] { border-color: #238636; background: #e9f7e9; }
.labs-choice-list button[data-state="incorrect"] { border-color: #b42318; background: #ffefed; }
[data-decision-feedback] { min-height: 24px; font-weight: 700; }
.labs-tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.labs-tool-grid article { padding: 20px; border: 1px solid var(--labs-line); border-radius: 16px; background: var(--labs-card); overflow: hidden; }
.labs-tool-grid article > span { color: var(--labs-blue); font-size: 12px; font-weight: 850; }
.labs-tool-grid code { padding: 12px; border-radius: 8px; display: block; overflow-wrap: anywhere; background: var(--labs-ink); color: white; font-size: 12px; }
.labs-tool-grid ul { padding-left: 18px; }
.labs-tool-grid small { color: var(--labs-muted); }
.labs-takeaway blockquote { margin: 30px 0 0; font-size: clamp(26px, 4vw, 44px); line-height: 1.2; letter-spacing: -.035em; }
.labs-lesson-actions { display: flex; align-items: center; gap: 20px; }
.labs-lesson-pagination { margin-top: 60px; padding-top: 28px; border-top: 1px solid var(--labs-line); display: flex; justify-content: space-between; }
.labs-lesson-pagination a { font-weight: 750; text-decoration: none; }

.labs-assessment { max-width: 900px; padding-block: 90px; }
.labs-assessment h1 { font-size: clamp(52px, 7vw, 86px); }
.labs-progress-note { padding: 16px; border-radius: 12px; background: var(--labs-card); }
.labs-assessment fieldset { margin: 54px 0; padding: 0; border: 0; }
.labs-assessment legend { margin-bottom: 20px; display: grid; grid-template-columns: 42px 1fr; gap: 10px; font-size: 24px; font-weight: 760; }
.labs-assessment legend span { color: var(--labs-blue); }
.labs-assessment fieldset > label { margin: 8px 0; display: block; cursor: pointer; }
.labs-assessment fieldset input { position: absolute; opacity: 0; }
.labs-assessment fieldset label > span { padding: 16px; border: 1px solid var(--labs-line); border-radius: 12px; display: grid; grid-template-columns: 30px 1fr; gap: 10px; background: var(--labs-card); }
.labs-assessment fieldset input:checked + span { border-color: var(--labs-blue); box-shadow: inset 0 0 0 1px var(--labs-blue); }
.labs-assessment fieldset input:focus-visible + span { outline: 3px solid var(--labs-blue); outline-offset: 2px; }
.labs-answer-explanation { margin-top: 12px; padding: 16px; border-radius: 10px; background: #e8e3ff; }
.labs-certificate-form { margin-top: 70px; padding: 34px; border-radius: var(--labs-radius); background: var(--labs-card); }
.labs-certificate-form label { display: grid; gap: 8px; font-weight: 750; }
.labs-certificate-form input { min-height: 50px; padding: 12px 14px; border: 1px solid var(--labs-line); border-radius: 10px; font: inherit; }
.labs-certificate-form form { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 12px; }

.ai-labs-certificate-page { min-height: 100vh; display: grid; place-items: center; padding: 30px; }
.labs-certificate { width: min(980px, 100%); padding: clamp(36px, 7vw, 90px); border: 1px solid var(--labs-ink); border-radius: 2px; position: relative; background: var(--labs-card); box-shadow: 0 30px 90px rgb(29 27 20 / .14); }
.labs-certificate::before { content: ""; position: absolute; inset: 12px; border: 1px solid var(--labs-line); pointer-events: none; }
.labs-certificate > * { position: relative; }
.labs-certificate > .labs-kicker { margin-top: 80px; }
.labs-certificate h1 { margin: 18px 0 4px; font-family: Georgia, serif; font-size: clamp(52px, 8vw, 94px); font-weight: 400; line-height: 1; letter-spacing: -.05em; }
.labs-certificate h2 { max-width: 700px; margin: 40px 0; font-size: clamp(30px, 5vw, 54px); line-height: 1.05; }
.labs-certificate > div { padding: 13px 0; border-top: 1px solid var(--labs-line); display: grid; grid-template-columns: 180px 1fr; }
.labs-certificate-note { max-width: 680px; color: var(--labs-muted); font-size: 13px; }

@media (max-width: 900px) {
  .labs-track-grid, .labs-hero--course, .labs-pricing { grid-template-columns: 1fr; }
  .labs-course-grid { grid-template-columns: 1fr 1fr; }
  .labs-role-grid { grid-template-columns: 1fr 1fr; }
  .labs-tool-grid { grid-template-columns: 1fr; }
  .labs-lesson-shell { grid-template-columns: 1fr; }
  .labs-lesson-rail { display: none; }
  .labs-agent-card { transform: none; }
}

@media (max-width: 600px) {
  .labs-wrap { width: min(100% - 28px, 1180px); }
  .labs-nav { min-height: 64px; }
  .labs-nav nav a:not(:last-child) { display: none; }
  .labs-nav--lesson > a:nth-child(2) { display: none; }
  .labs-hero { padding-top: 64px; }
  .labs-track-grid, .labs-current, .labs-coming { padding-bottom: 70px; }
  .labs-course-grid, .labs-plan-grid, .labs-role-grid { grid-template-columns: 1fr; }
  .labs-role-grid article { min-height: 160px; }
  .labs-role-grid h3 { margin-top: 34px; }
  .labs-curriculum a { grid-template-columns: 34px 1fr; }
  .labs-curriculum small { grid-column: 2; }
  .labs-footer { align-items: flex-start; gap: 18px; flex-direction: column; }
  .labs-lesson-main { width: calc(100% - 28px); padding-top: 50px; }
  .labs-certificate-form form { grid-template-columns: 1fr; }
  .labs-certificate > div { grid-template-columns: 1fr; gap: 4px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
  .labs-button:hover { transform: none; }
}

@media print {
  body.ai-labs-certificate-page { padding: 0; background: white; }
  .labs-certificate { box-shadow: none; border: 1px solid black; }
  .labs-print-button { display: none; }
}