:root {
  --course-ink: #10272c;
  --course-muted: #5d6e70;
  --course-paper: #f6f4eb;
  --course-paper-2: #ece9dc;
  --course-line: rgba(16, 39, 44, .17);
  --course-accent: #087f78;
  --course-accent-strong: #05655f;
  --course-on-accent: #fff;
  --course-table: #176b53;
  --course-rail: #422f25;
  --course-panel: rgba(255, 255, 255, .62);
  --course-shadow: 0 22px 56px rgba(15, 42, 44, .12);
  --course-radius: 20px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --course-ink: #eff8f5;
    --course-muted: #a9bbb8;
    --course-paper: #0c1d21;
    --course-paper-2: #13282c;
    --course-line: rgba(221, 240, 235, .16);
    --course-accent: #72d9cd;
    --course-accent-strong: #9ce7de;
    --course-on-accent: #092326;
    --course-panel: rgba(22, 47, 50, .72);
    --course-shadow: 0 22px 56px rgba(0, 0, 0, .28);
  }
}

body.course-page {
  color: var(--course-ink);
  background:
    linear-gradient(90deg, transparent 0, transparent calc(50% - 1px), rgba(12, 83, 79, .045) 50%, transparent calc(50% + 1px)),
    var(--course-paper);
}

.course-page * { box-sizing: border-box; }
.course-page .site-nav { background: rgba(11, 31, 36, .96); }
.course-page .nav-links a[aria-current="page"] { color: #fff; }
.course-page .nav-links a[aria-current="page"]::after { width: 100%; }

.course-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.course-main { padding: 112px 0 80px; }

.course-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 18px;
  color: var(--course-accent-strong);
  font-size: .82rem;
  font-weight: 750;
  letter-spacing: .1em;
}

.course-kicker::before {
  width: 28px;
  height: 2px;
  content: "";
  background: currentColor;
}

.course-title {
  max-width: 780px;
  margin: 0;
  font-size: clamp(2.7rem, 7vw, 6.2rem);
  line-height: .98;
  letter-spacing: -.06em;
}

.course-title .outline {
  color: transparent;
  -webkit-text-stroke: 1.3px var(--course-ink);
}

.course-lead {
  max-width: 620px;
  margin: 26px 0 0;
  color: var(--course-muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.75;
}

.course-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.course-button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--course-line);
  border-radius: 999px;
  color: var(--course-ink);
  background: transparent;
  font: inherit;
  font-weight: 720;
  text-decoration: none;
  cursor: pointer;
  transition: transform .2s ease, background .2s ease, color .2s ease;
}

.course-button:hover { transform: translateY(-2px); }
.course-button.primary {
  border-color: var(--course-accent);
  color: var(--course-on-accent);
  background: var(--course-accent);
}
.course-button:focus-visible,
.shot-tab:focus-visible,
.timeline:focus-visible,
.quiz-option:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--course-accent) 46%, transparent);
  outline-offset: 3px;
}

.course-hero {
  display: grid;
  min-height: 690px;
  align-items: center;
  grid-template-columns: 1.04fr .96fr;
  gap: clamp(36px, 7vw, 92px);
  padding-bottom: 76px;
}

.course-hero-visual {
  position: relative;
  min-height: 560px;
}

.course-hero-visual img {
  width: calc(100% + 7vw);
  height: 560px;
  object-fit: cover;
  object-position: 54% center;
  border-radius: 3px 3px 90px 3px;
  box-shadow: var(--course-shadow);
}

.course-hero-caption {
  position: absolute;
  right: -4vw;
  bottom: 28px;
  width: min(330px, 76%);
  padding: 20px 22px;
  color: #f8fbf5;
  background: rgba(7, 31, 32, .9);
  backdrop-filter: blur(10px);
}

.course-hero-caption strong { display: block; margin-bottom: 5px; font-size: 1.05rem; }
.course-hero-caption span { color: rgba(255, 255, 255, .72); font-size: .88rem; line-height: 1.5; }

.course-stats {
  display: grid;
  border-block: 1px solid var(--course-line);
  grid-template-columns: repeat(4, 1fr);
}

.course-stat { padding: 28px clamp(12px, 3vw, 34px); border-right: 1px solid var(--course-line); }
.course-stat:last-child { border-right: 0; }
.course-stat strong { display: block; font-size: clamp(1.45rem, 3vw, 2.4rem); letter-spacing: -.04em; }
.course-stat span { display: block; margin-top: 5px; color: var(--course-muted); font-size: .86rem; }

.course-section { padding: 96px 0; }
.course-section-head {
  display: grid;
  align-items: end;
  grid-template-columns: 1fr minmax(280px, 520px);
  gap: 40px;
  margin-bottom: 48px;
}
.course-section h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1.05;
  letter-spacing: -.045em;
}
.course-section-head p { margin: 0; color: var(--course-muted); line-height: 1.8; }
.course-section-cta { margin-top: 24px; }

.chapter-list { border-top: 1px solid var(--course-line); }
.chapter {
  display: grid;
  grid-template-columns: 120px 1fr auto;
  gap: 30px;
  align-items: center;
  padding: 26px 4px;
  border-bottom: 1px solid var(--course-line);
}
.chapter-level { color: var(--course-accent-strong); font-size: .85rem; font-weight: 800; }
.chapter h3 { margin: 0 0 7px; font-size: clamp(1.15rem, 2vw, 1.5rem); }
.chapter p { margin: 0; color: var(--course-muted); line-height: 1.55; }
.chapter-status { color: var(--course-muted); font-size: .84rem; white-space: nowrap; }
.chapter-status.live { color: var(--course-accent-strong); font-weight: 750; }

.featured-lesson {
  display: grid;
  grid-template-columns: minmax(260px, .78fr) minmax(400px, 1.22fr);
  background: #092c2d;
  color: #f7fbf8;
}
.featured-copy { padding: clamp(34px, 6vw, 76px); }
.featured-copy h2 { max-width: 560px; }
.featured-copy p { max-width: 540px; color: rgba(255, 255, 255, .68); line-height: 1.8; }
.featured-copy .course-button { margin-top: 24px; color: #fff; border-color: rgba(255,255,255,.3); }
.featured-demo {
  display: flex;
  min-height: 430px;
  align-items: center;
  justify-content: center;
  padding: 46px;
  background:
    radial-gradient(circle at 72% 34%, rgba(116, 224, 210, .13), transparent 33%),
    #0e3d3b;
}
.mini-table {
  position: relative;
  width: min(100%, 540px);
  aspect-ratio: 2.008 / 1;
  border: 18px solid #4c3024;
  border-radius: 13px;
  background: #176b53;
  box-shadow: 0 25px 50px rgba(0,0,0,.32);
}
.mini-table::before,
.mini-table::after {
  position: absolute;
  top: 50%;
  width: 18px;
  height: 32px;
  content: "";
  transform: translateY(-50%);
  border-radius: 50%;
  background: #101b1b;
}
.mini-table::before { left: -18px; }
.mini-table::after { right: -18px; }
.mini-ball { position: absolute; width: 5.4%; aspect-ratio: 1; border-radius: 50%; box-shadow: inset -4px -5px 8px rgba(0,0,0,.24); }
.mini-ball.cue { left: 31%; top: 58%; background: #f8f1d9; }
.mini-ball.target { left: 62%; top: 34%; background: #111; }
.mini-line { position: absolute; left: 35%; top: 59%; width: 35%; border-top: 2px dashed rgba(255,255,255,.72); transform: rotate(-20deg); transform-origin: left; }

.evidence-grid {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 60px;
}
.evidence-note {
  padding: 28px 0;
  border-top: 3px solid var(--course-accent);
  color: var(--course-muted);
  line-height: 1.75;
}
.evidence-list { border-top: 1px solid var(--course-line); }
.evidence-row { display: grid; grid-template-columns: 140px 1fr; gap: 30px; padding: 22px 0; border-bottom: 1px solid var(--course-line); }
.evidence-row dt { color: var(--course-muted); }
.evidence-row dd { margin: 0; line-height: 1.6; }

.course-breadcrumb { margin: 0 0 30px; color: var(--course-muted); font-size: .88rem; }
.course-breadcrumb a { color: inherit; }

.curriculum-hero { padding: 76px 0 62px; border-bottom: 1px solid var(--course-line); }
.curriculum-hero .course-title { font-size: clamp(2.7rem, 6vw, 5.5rem); }
.curriculum-summary { display: grid; grid-template-columns: 1.1fr .9fr; gap: 70px; margin-top: 58px; }
.curriculum-summary p { margin: 0; color: var(--course-muted); font-size: 1.08rem; line-height: 1.8; }
.curriculum-meta { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--course-line); }
.curriculum-meta div { padding: 22px; background: var(--course-paper); }
.curriculum-meta strong { display: block; font-size: 1.25rem; }
.curriculum-meta span { display: block; margin-top: 5px; color: var(--course-muted); font-size: .82rem; }

.lesson-main { padding: 100px 0 90px; }
.lesson-header { max-width: 940px; padding: 52px 0 56px; }
.lesson-header h1 { margin: 0; font-size: clamp(2.7rem, 6.8vw, 6.4rem); line-height: .98; letter-spacing: -.06em; }
.lesson-deck { max-width: 720px; margin: 28px 0 0; color: var(--course-muted); font-size: clamp(1.08rem, 2.2vw, 1.4rem); line-height: 1.75; }
.lesson-facts { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 28px; color: var(--course-muted); font-size: .86rem; }
.lesson-answer {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 38px;
  padding: 34px 0;
  border-block: 1px solid var(--course-line);
}
.lesson-answer .label { color: var(--course-accent-strong); font-weight: 800; }
.lesson-answer p { margin: 0; font-size: clamp(1.25rem, 2.6vw, 2rem); line-height: 1.5; letter-spacing: -.02em; }

.course-page .shot-lab { padding-right: 0; padding-left: 0; }
.shot-lab { margin: 72px 0 86px; }
.lab-head { display: grid; grid-template-columns: 1fr minmax(260px, 440px); gap: 30px; align-items: end; margin-bottom: 24px; }
.lab-head h2 { margin: 0; font-size: clamp(1.8rem, 3.5vw, 3.3rem); letter-spacing: -.04em; }
.lab-head p { margin: 0; color: var(--course-muted); line-height: 1.65; }
.lesson-simulator-shell { overflow: hidden; border: 1px solid #173638; background: #06191b; box-shadow: var(--course-shadow); }
.lesson-simulator-guide {
  display: flex; min-height: 64px; align-items: center; justify-content: space-between; gap: 24px;
  padding: 12px 18px; border-bottom: 1px solid rgba(231,249,242,.13); color: #eef8f3; background: #0a2527;
}
.lesson-simulator-guide > div { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: baseline; }
.lesson-simulator-guide strong { color: #76dfd1; font-size: .75rem; letter-spacing: .08em; }
.lesson-simulator-guide span { color: rgba(236,249,244,.68); font-size: .82rem; }
.lesson-simulator-guide a { color: #eef8f3; font-size: .78rem; font-weight: 720; white-space: nowrap; }
.lesson-simulator-frame { display: block; width: 100%; height: 700px; border: 0; background: #06191b; }
.lab-frame { padding: clamp(16px, 3vw, 32px); background: #071f21; color: #eef8f3; box-shadow: var(--course-shadow); }
.lab-toolbar { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.shot-tabs, .playback-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.shot-tab, .lab-control {
  min-height: 42px;
  padding: 0 17px;
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  color: rgba(255,255,255,.82);
  background: transparent;
  font: inherit;
  font-weight: 680;
  cursor: pointer;
}
.shot-tab[aria-pressed="true"] { border-color: #fff; color: #092326; background: #fff; }
.lab-control:hover, .shot-tab:hover { border-color: rgba(255,255,255,.58); }
.canvas-wrap {
  position: relative;
  min-height: 300px;
  overflow: hidden;
  background: #0b292a;
}
#shotCanvas { display: block; width: 100%; aspect-ratio: 2.18 / 1; }
.lab-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 30px;
  text-align: center;
  background: #0b292a;
  z-index: 2;
}
.lab-state[hidden] { display: none; }
.lab-state p { max-width: 480px; color: rgba(255,255,255,.72); line-height: 1.7; }
.lab-state .course-button { color: #fff; border-color: rgba(255,255,255,.32); }
.lab-loading-dot { width: 48px; height: 4px; margin: 0 auto 16px; background: #78dcd1; animation: loadline 1s ease-in-out infinite alternate; }
@keyframes loadline { to { width: 128px; opacity: .35; } }
.lab-timeline { display: grid; grid-template-columns: 62px 1fr 62px; gap: 14px; align-items: center; margin-top: 17px; color: rgba(255,255,255,.7); font-variant-numeric: tabular-nums; }
.timeline { width: 100%; accent-color: #78dcd1; }
.lab-readout { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: start; padding-top: 22px; margin-top: 20px; border-top: 1px solid rgba(255,255,255,.15); }
.lab-readout h3 { margin: 0 0 8px; font-size: 1.22rem; }
.lab-readout p { max-width: 760px; margin: 0; color: rgba(255,255,255,.68); line-height: 1.65; }
.exact-badge { color: #9ce7de; font-size: .78rem; font-weight: 750; white-space: nowrap; }

.lesson-layout { display: grid; grid-template-columns: minmax(0, 720px) minmax(230px, 1fr); gap: clamp(48px, 8vw, 110px); align-items: start; }
.lesson-article h2 { margin: 70px 0 20px; font-size: clamp(1.65rem, 3vw, 2.5rem); letter-spacing: -.035em; }
.lesson-article h2:first-child { margin-top: 0; }
.lesson-article h3 { margin: 34px 0 12px; font-size: 1.2rem; }
.lesson-article p, .lesson-article li { color: var(--course-muted); line-height: 1.85; }
.lesson-article strong { color: var(--course-ink); }
.lesson-article ol, .lesson-article ul { padding-left: 1.3em; }
.concept-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 30px 0; background: var(--course-line); }
.concept-strip div { padding: 24px; background: var(--course-paper); }
.concept-strip strong { display: block; margin-bottom: 9px; }
.concept-strip span { color: var(--course-muted); font-size: .92rem; line-height: 1.55; }
.lesson-aside { position: sticky; top: 100px; }
.aside-block { padding: 24px 0; border-top: 1px solid var(--course-line); }
.aside-block:last-child { border-bottom: 1px solid var(--course-line); }
.aside-block h3 { margin: 0 0 16px; font-size: 1rem; }
.aside-block dl { display: grid; grid-template-columns: 1fr auto; gap: 11px 16px; margin: 0; color: var(--course-muted); font-size: .86rem; }
.aside-block dd { margin: 0; color: var(--course-ink); font-variant-numeric: tabular-nums; }
.confidence { color: var(--course-muted); font-size: .84rem; line-height: 1.7; }

.quiz { margin-top: 70px; padding: clamp(28px, 5vw, 48px); border: 1px solid var(--course-line); }
.quiz h2 { margin-top: 0; }
.quiz-options { display: grid; gap: 10px; margin-top: 22px; }
.quiz-option { padding: 15px 18px; border: 1px solid var(--course-line); color: var(--course-ink); background: transparent; text-align: left; font: inherit; cursor: pointer; }
.quiz-option:hover { border-color: var(--course-accent); }
.quiz-option[aria-pressed="true"] { border-color: var(--course-accent); background: color-mix(in srgb, var(--course-accent) 12%, transparent); }
.quiz-result { min-height: 1.5em; margin: 16px 0 0; color: var(--course-accent-strong); font-weight: 720; }

.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 72px;
  padding-top: 24px;
  border-top: 1px solid var(--course-line);
}
.lesson-nav a { display: block; padding: 18px; border: 1px solid var(--course-line); color: var(--course-ink); text-decoration: none; }
.lesson-nav a:last-child { text-align: right; }
.lesson-nav span { display: block; margin-bottom: 6px; color: var(--course-muted); font-size: .76rem; }
.lesson-nav strong { font-size: .96rem; }

.course-footer { padding: 38px 0 48px; border-top: 1px solid var(--course-line); color: var(--course-muted); }
.course-footer-inner { display: flex; justify-content: space-between; gap: 24px; }
.course-footer a { color: inherit; }
.course-footer-links { display: flex; flex-wrap: wrap; gap: 18px; }

@media (max-width: 860px) {
  .course-main { padding-top: 88px; }
  .course-hero { grid-template-columns: 1fr; min-height: 0; padding-top: 54px; }
  .course-hero-visual { min-height: 440px; }
  .course-hero-visual img { width: 100%; height: 440px; }
  .course-hero-caption { right: 18px; }
  .course-stats { grid-template-columns: 1fr 1fr; }
  .course-stat:nth-child(2) { border-right: 0; }
  .course-stat:nth-child(-n+2) { border-bottom: 1px solid var(--course-line); }
  .course-section-head, .curriculum-summary, .lab-head, .lesson-layout, .evidence-grid { grid-template-columns: 1fr; }
  .featured-lesson { grid-template-columns: 1fr; }
  .featured-demo { min-height: 330px; }
  .lesson-aside { position: static; }
  .lesson-simulator-frame { height: 1180px; }
  .lesson-nav { grid-template-columns: 1fr; }
  .lesson-nav a:last-child { text-align: left; }
}

@media (max-width: 580px) {
  .course-shell { width: min(100% - 28px, 1180px); }
  .course-title { font-size: clamp(2.6rem, 15vw, 4.4rem); }
  .course-hero { gap: 34px; padding-bottom: 52px; }
  .course-hero-visual { min-height: 360px; }
  .course-hero-visual img { height: 360px; border-radius: 2px 2px 50px 2px; }
  .course-hero-caption { right: 12px; bottom: 16px; padding: 16px; }
  .course-section { padding: 70px 0; }
  .course-section-head { gap: 20px; }
  .chapter { grid-template-columns: 72px 1fr; gap: 16px; }
  .chapter-status { grid-column: 2; }
  .lesson-answer { grid-template-columns: 1fr; gap: 12px; }
  .canvas-wrap { min-height: 210px; }
  #shotCanvas { aspect-ratio: 1.42 / 1; }
  .lab-readout { grid-template-columns: 1fr; }
  .concept-strip { grid-template-columns: 1fr; }
  .course-footer-inner { flex-direction: column; }
  .evidence-row { grid-template-columns: 1fr; gap: 8px; }
  .lesson-simulator-guide { align-items: flex-start; flex-direction: column; gap: 8px; padding: 14px; }
  .lesson-simulator-shell { width: 100vw; margin-left: calc(50% - 50vw); border-right: 0; border-left: 0; }
  .lesson-simulator-frame { height: 1180px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}