:root {
  --ink: #102432;
  --muted: #526170;
  --teal: #087c69;
  --teal-dark: #056352;
  --mint: #edf5f1;
  --line: #d7e0e4;
  --white: #fff;
  --gutter: clamp(24px, 5.3vw, 86px);
  --display: Georgia, 'Times New Roman', serif;
  --body: Arial, Helvetica, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; color: var(--ink); background: var(--white); font: 18px/1.55 var(--body); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; }
button, input, textarea { font: inherit; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--teal); }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid var(--teal); outline-offset: 6px; border-radius: 2px; }
button { cursor: pointer; }
svg { flex: none; }
[hidden] { display: none !important; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-family: var(--display); font-weight: 400; line-height: 1.09; letter-spacing: -.045em; }
h2 { font-size: clamp(36px, 4.15vw, 60px); }
h3 { font-size: clamp(25px, 2.35vw, 34px); letter-spacing: -.025em; }
p { color: var(--muted); }
.container { margin-inline: auto; width: calc(100% - var(--gutter) * 2); max-width: 1440px; }
.skip-link { position: absolute; top: 4px; left: 12px; z-index: 9; background: #fff; padding: 12px; transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.preview-notice { background: var(--mint); text-align: center; font-size: 14px; line-height: 1.4; padding: 8px 20px; }
.site-header { min-height: clamp(70px, 6.2vw, 94px); display: flex; align-items: center; gap: 40px; }
.brand { font: 500 22px/1 var(--body); letter-spacing: .28em; white-space: nowrap; }
.main-nav { display: flex; justify-content: center; align-items: center; gap: clamp(24px, 3vw, 44px); margin-left: auto; font-size: 16px; }
.main-nav a { white-space: nowrap; padding-block: 12px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; background: var(--teal); border: 1px solid var(--teal); border-radius: 4px; padding: 17px 27px; min-height: 54px; color: var(--white); font: 600 17px/1.3 var(--body); text-decoration: none; transition: background-color .15s, border-color .15s; }
.button:hover { color: #fff; background: var(--teal-dark); border-color: var(--teal-dark); }
.button-outline { color: var(--teal); background: transparent; }
.button-outline:hover { color: var(--teal-dark); background: var(--mint); }
.header-cta { padding: 12px 25px; min-height: 44px; margin-left: clamp(8px, 6vw, 100px); font-size: 15px; font-weight: 500; }
.arrow { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.75; stroke-linecap: round; stroke-linejoin: round; }
.text-link { display: inline-flex; align-items: center; gap: 10px; color: var(--teal); font-size: 17px; font-weight: 500; }
.text-link:hover { text-decoration: underline; text-underline-offset: 5px; }
.home-hero { display: grid; grid-template-columns: 45% 55%; max-width: 1680px; margin-inline: auto; align-items: stretch; }
.home-intro { padding: clamp(36px, 4.58vw, 66px) 8px clamp(32px, 3.35vw, 48px) var(--gutter); align-self: center; }
.home-intro h1 { font-size: clamp(52px, 5.58vw, 84px); line-height: 1.045; letter-spacing: -.055em; }
.hero-lead { font-size: clamp(20px, 1.8vw, 26px); line-height: 1.45; margin: 30px 0 34px; max-width: 560px; }
.home-intro .hero-lead { font-size: clamp(18px, 1.72vw, 24px); }
.hero-photo { min-width: 0; }
.hero-photo img { width: 100%; height: 100%; aspect-ratio: 1.35; object-fit: cover; object-position: center; }
.catalogue { padding-top: clamp(36px, 3.6vw, 52px); padding-bottom: clamp(32px, 3.5vw, 50px); }
.section-intro { margin-top: 15px; font-size: clamp(17px, 1.6vw, 21px); }
.course-directory { list-style: none; padding: 0; margin: 22px 0 0; }
.course-row { display: grid; grid-template-columns: clamp(40px, 4.17vw, 60px) clamp(112px, 9.7vw, 140px) minmax(0, 1fr) auto; grid-template-areas: "number thumbnail copy status"; column-gap: clamp(20px, 2.08vw, 30px); align-items: center; padding: clamp(18px, 1.6vw, 23px) 0; border-bottom: 1px solid var(--line); min-height: clamp(94px, 8.2vw, 118px); }
.course-row:last-child { border: 0; }
.course-number { grid-area: number; font-size: 16px; align-self: start; padding-top: 10px; color: var(--muted); }
.course-thumbnail { grid-area: thumbnail; width: 100%; height: auto; aspect-ratio: 1402 / 1122; object-fit: cover; object-position: center; border-radius: 4px; align-self: start; }
.course-copy { grid-area: copy; min-width: 0; }
.course-copy h3 { font-size: clamp(25px, 2.35vw, 34px); }
.course-copy p { margin-top: 6px; font-size: clamp(16px, 1.43vw, 20px); }
.course-status { grid-area: status; font-size: 16px; color: var(--muted); margin-left: 15px; }
a.course-status { color: var(--teal); }
.approach-band { background: var(--mint); padding-block: clamp(36px, 3.6vw, 52px); }
.approach-grid { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 36px; gap: 38px; }
.approach-grid > div { border-right: 1px solid #c5d5d4; padding-right: 28px; }
.approach-grid > div:last-child { padding-right: 0; border: 0; }
.approach-grid h3 { font-size: clamp(24px, 2.15vw, 30px); }
.approach-grid p { margin-top: 8px; font-size: clamp(16px, 1.35vw, 19px); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-block: clamp(22px, 2.2vw, 32px); }
.site-footer .brand { font-size: 17px; }
.site-footer p { font-size: 13px; }
.section-spacing { padding-block: 56px; }
.course-hero { display: grid; grid-template-columns: .9fr 1.1fr; gap: 64px; padding-top: 56px; padding-bottom: 46px; align-items: stretch; }
.course-intro { min-width: 0; }
.course-intro h1 { font-size: clamp(64px, 6.4vw, 96px); line-height: .99; font-weight: 600; }
.course-intro .hero-lead { font-size: clamp(19px, 1.95vw, 28px); }
.course-photo { margin: 0; min-width: 0; align-self: center; }
.course-photo img { width: 100%; height: auto; aspect-ratio: 1402 / 1122; object-fit: cover; object-position: center; border-radius: 8px; }
.course-photo figcaption { margin-top: 12px; color: var(--muted); font-size: 13px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 20px 30px; }
.actions .text-link { text-decoration: underline; text-underline-offset: 8px; }
.fine-print { font-size: 15px; margin-top: 23px; }
.code-panel { margin: 0; background: var(--ink); color: #f2f5f4; border-radius: 8px; padding: 42px; display: flex; flex-direction: column; justify-content: flex-start; min-width: 0; }
.code-caption { color: #f2f5f4; font: 17px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; margin-bottom: 44px; }
pre, code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; font-size: 16px; line-height: 1.75; tab-size: 4; }
.code-panel pre { font-size: clamp(14px, 1.2vw, 18px); }
.code-string, .code-function { color: #89dfca; }
.code-output { border-top: 1px solid #66808b; margin-top: 30px; padding-top: 24px; }
.code-panel .fine-print { color: #b5c5cd; font-size: 13px; margin-top: auto; padding-top: 46px; text-align: right; }
.outcomes { border-top: 1px solid var(--line); }
.outcome-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 36px; margin-top: 38px; }
.outcome-grid h3 { font-size: clamp(23px, 1.9vw, 29px); }
.outcome-grid p { margin-top: 12px; font-size: clamp(17px, 1.4vw, 20px); }
.outline { padding-top: 52px; }
.outline-list { margin-top: 36px; }
.outline-list details { border-top: 1px solid var(--line); }
.outline-list details:last-child { border-bottom: 1px solid var(--line); }
.outline-list summary { list-style: none; display: flex; align-items: center; gap: 30px; cursor: pointer; padding: 24px 0; }
.outline-list summary::-webkit-details-marker { display: none; }
.outline-number { color: var(--teal); font: 400 27px/1 var(--display); border-right: 1px solid #a0b2bd; padding-right: 32px; }
.outline-title { font: 400 clamp(23px, 2.3vw, 34px)/1.25 var(--display); letter-spacing: -.025em; }
.disclosure-icon { margin-left: auto; width: 22px; height: 22px; fill: none; stroke: var(--teal); stroke-width: 1.75; }
details[open] .disclosure-icon .vertical { display: none; }
.outline-content { margin-left: 92px; padding: 0 28px 28px 0; color: var(--muted); font-size: 18px; }
.sample-band { background: var(--mint); padding-block: 65px; }
.sample-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 64px; align-items: start; }
.sample-intro { padding-top: 22px; }
.sample-intro h2 { font-size: clamp(40px, 4.4vw, 64px); }
.sample-intro p { margin-top: 22px; }
.sample-intro .fine-print { margin-top: 48px; }
.challenge { background: var(--white); border: 1px solid var(--line); border-radius: 5px; padding: 28px; min-width: 0; }
.challenge h3 { font-size: 25px; margin-bottom: 18px; }
.exercise-code, .expected-output { background: #f5f7f8; border: 1px solid #e2e7eb; border-radius: 5px; padding: 18px; color: var(--ink); }
.challenge .code-string { color: #0b6959; }
.challenge .code-keyword { color: #174ba0; }
.challenge .code-function { color: #174ba0; }
.challenge .code-comment { color: #506776; }
.output-label { margin-block: 15px 8px; color: var(--ink); font-size: 16px; font-weight: 600; }
.lesson-actions { display: flex; gap: 16px; margin-top: 22px; }
.lesson-actions .button { flex: 1; padding-inline: 14px; font-size: 16px; }
.reveal-panel { margin-top: 24px; padding-top: 22px; border-top: 1px solid var(--line); }
.reveal-panel p { font-size: 16px; }
.reveal-panel pre { margin-block: 14px; font-size: 14px; }
.reveal-panel h4 { font-size: 17px; margin: 0 0 10px; }
@media (min-width: 1680px) { .home-intro { padding-left: 100px; } }
@media (max-width: 1100px) {
  .site-header { gap: 24px; }
  .header-cta { margin-left: 0; }
  .brand { font-size: 19px; }
  .home-intro { padding-top: 44px; padding-bottom: 44px; }
  .home-intro h1 { font-size: 5.6vw; }
  .course-hero, .sample-grid { gap: 36px; }
  .course-intro h1 { font-size: 7.1vw; }
  .code-panel { padding: 30px; }
  .course-row { column-gap: 20px; grid-template-columns: 32px 112px minmax(0, 1fr) auto; }
  .course-status { font-size: 14px; }
  .approach-grid { gap: 24px; }
  .outcome-grid { gap: 24px; }
}
@media (max-width: 800px) {
  .site-header { min-height: 110px; flex-wrap: wrap; justify-content: space-between; gap: 8px 22px; padding-block: 18px; }
  .main-nav { order: 3; width: 100%; margin-left: 0; justify-content: flex-start; gap: 30px; font-size: 15px; }
  .main-nav a { padding-block: 5px; }
  .header-cta { padding: 10px 16px; font-size: 14px; min-height: 40px; }
  .home-hero { grid-template-columns: 1fr; }
  .home-intro { padding: 34px var(--gutter) 40px; }
  .home-intro h1 { font-size: clamp(42px, 8.8vw, 68px); line-height: 1.04; }
  .home-intro .hero-lead { max-width: 530px; font-size: 21px; margin-block: 24px 28px; }
  .hero-photo { margin-inline: var(--gutter); }
  .hero-photo img { aspect-ratio: 5 / 4; max-height: 580px; }
  .catalogue { padding-block: 48px 36px; }
  .course-row { grid-template-columns: 32px 88px minmax(0, 1fr); grid-template-areas: "number thumbnail copy" ". . status"; gap: 12px 16px; padding-block: 24px; }
  .course-status { margin: 0; font-size: 15px; }
  .course-number { padding-top: 6px; }
  .course-copy h3 { font-size: 28px; }
  .course-copy p { font-size: 17px; }
  .approach-grid { grid-template-columns: 1fr; gap: 25px; margin-top: 30px; }
  .approach-grid > div { border: 0; padding: 0; }
  .approach-grid h3 { font-size: 27px; }
  .approach-grid p { font-size: 17px; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 15px; padding-block: 32px; }
  .course-hero, .sample-grid { grid-template-columns: minmax(0, 1fr); gap: 36px; }
  .course-hero { padding-top: 32px; }
  .course-intro h1 { font-size: clamp(56px, 10vw, 80px); }
  .course-intro .hero-lead { font-size: 22px; margin-block: 26px; }
  .actions .text-link { font-size: 16px; }
  .code-panel { min-height: 350px; padding: 28px; }
  .code-panel pre { font-size: 15px; }
  .code-caption { margin-bottom: 28px; font-size: 16px; }
  .outcome-grid { grid-template-columns: repeat(2, 1fr); row-gap: 32px; }
  .outcome-grid h3 { font-size: 26px; }
  .outline-list summary { gap: 18px; padding-block: 22px; }
  .outline-number { padding-right: 18px; font-size: 23px; }
  .outline-title { font-size: 25px; }
  .outline-content { margin-left: 66px; font-size: 17px; padding-right: 0; }
  .sample-intro { padding: 0; }
  .sample-intro .fine-print { margin-top: 26px; }
  .sample-band { padding-block: 46px; }
  .challenge { padding: 22px; }
}
@media (max-width: 420px) {
  .preview-notice { font-size: 12px; }
  .brand { font-size: 17px; letter-spacing: .23em; }
  .header-cta { font-size: 12px; padding: 10px 12px; }
  .main-nav { gap: 24px; font-size: 14px; }
  .home-intro h1 { font-size: 42px; }
  .home-intro .hero-lead { font-size: 18px; }
  .button { font-size: 16px; padding: 15px 22px; }
  .header-cta { font-size: 12px; padding: 10px 12px; }
  h2 { font-size: 36px; }
  .course-row { grid-template-columns: 32px minmax(0, 1fr); grid-template-areas: "number thumbnail" ". copy" ". status"; }
  .course-thumbnail { max-width: 140px; }
  .course-copy h3 { font-size: 25px; }
  .course-copy p { font-size: 16px; }
  .course-intro h1 { font-size: clamp(46px, 13.2vw, 53px); }
  .course-intro .hero-lead { font-size: 20px; }
  .outcome-grid { grid-template-columns: 1fr; }
  .code-panel { padding: 22px; }
  .code-panel pre { font-size: 13px; }
  .code-caption { font-size: 14px; }
  .outline-title { font-size: 23px; }
  .outline-list summary { gap: 14px; }
  .outline-number { padding-right: 14px; }
  .outline-content { margin-left: 59px; }
  .sample-intro h2 { font-size: 40px; }
  .challenge { padding: 18px; }
  .exercise-code, .expected-output { padding: 13px; font-size: 13px; }
  .lesson-actions { flex-direction: column; gap: 12px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}