styles.css

/* @atlas/design-system v0.1.0 — Motion Applied's shared token set, extracted
     from ATLAS Web Viewer (npm install atlas-design-system-0.1.0.tgz).
     Dark-only, sharp-edged (--radius: 2px — this site already draws every
     panel as a flat 1px-hairline rectangle, so nothing here needed rounding).
     Values below are copied straight from the package's src/styles/tokens.css
     rather than re-derived, so this file has one source of truth to track.

     The package defines two text tiers (foreground/muted-foreground), not
     three — --ink and --ink-2 are intentionally the same value now; there is
     no third, dimmer "body copy" grey in the source to alias instead.

     The package ships one accent (--primary: #FF6600) and no tint ramp for
     it, so --accent-d/-l and the hero trace's speed ramp are computed tints
     of that single primary — same 80%/60%/40%-toward-white formula this file
     used before, now anchored to the package's orange instead of an
     independently-picked one. Keep these four values in sync if --primary
     ever changes upstream.

     Contrast against the #0A0A0A ground: foreground 17.8:1, muted-foreground
     8.0:1, accent-l (the link colour) 9.9:1 — all comfortably clear AA. */
  :root {
    color-scheme: dark;
    --ground:   #0A0A0A;   /* --background */
    --surface:  #131313;   /* --card */
    --raised:   #1A1A1A;   /* --secondary / --muted */
    --line:     #272727;   /* --border */
    --line-2:   #3A3A3A;   /* --border-strong */
    --muted:    #A8A8A8;   /* --muted-foreground */
    --ink-2:    #F4F4F4;   /* --foreground — aliased to --ink, see note above */
    --ink:      #F4F4F4;   /* --foreground */
    --accent:   #FF6600;   /* --primary */
    --accent-d: #FF8533;   /* --primary, 80% tint toward white */
    --accent-l: #FFA366;   /* --primary, 60% tint toward white */

    /* The package has one font role (--font-sans) and no separate display
       face, so headings and body share it rather than keeping an invented
       distinction the source doesn't make. */
    --sans: 'Helvetica Neue', Helvetica, Arial, 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --display: 'Helvetica Neue', Helvetica, Arial, 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'SFMono-Regular', Menlo, Consolas, monospace;
  }

  /* The package's shared base layer: every heading across Motion Applied's
     products in this system is set in caps with a touch of tracking. */
  h1, h2, h3, h4 { text-transform: uppercase; letter-spacing: 0.02em; }

  * { box-sizing: border-box; }

  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

  body {
    margin: 0;
    background: var(--ground);
    color: var(--ink);
    font-family: var(--sans);
    font-size: 16.5px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }

  a { color: var(--accent-l); }

  :focus-visible {
    outline: 2px solid var(--accent-l);
    outline-offset: 3px;
  }

  .wrap { max-width: 1140px; margin: 0 auto; padding: 0 28px; }
  .narrow { max-width: 660px; }

  /* `.wrap.narrow` on one element made it a 660px column centred in the page,
     while a sibling `.wrap` stayed 1140px - so the left edge jumped between
     sections and the page read as misaligned. Keep the page gutter, constrain
     the measure, and every section starts on the same line. */
  .wrap.narrow { max-width: 1140px; }
  .wrap.narrow > * { max-width: 660px; }

  .label {
    font-family: var(--sans);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 14px;
  }

  h2 {
    font-family: var(--display);
    font-weight: 700;
    font-size: clamp(27px, 3.3vw, 39px);
    line-height: 1.12;
    letter-spacing: -0.02em;
    margin: 0 0 20px;
    text-wrap: balance;
  }

  .lede { font-size: 19px; color: var(--ink-2); }

  .band { padding: 92px 0; border-top: 1px solid var(--line); }

  /* ── hero ─────────────────────────────────────────────────────────── */

  .hero {
    position: relative;
    padding: 40px 0 64px;
    border-bottom: 1px solid var(--line);
  }

  .hero-copy { max-width: none; }

  /* The two panels: the data on the left, the thing that marks your work on
     the right. Stacks below 900px. */
  .hero-panels {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    gap: 18px;
    margin-top: 32px;
    align-items: stretch;
  }
  @media (max-width: 900px) {
    .hero-panels { grid-template-columns: 1fr; }
  }

  .panel {
    border: 1px solid var(--line);
    background: var(--surface);
    display: flex;
    flex-direction: column;
    min-width: 0;
  }
  .panel-head {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 16px;
    border-bottom: 1px solid var(--line);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    background: var(--raised);
  }
  .panel-head .dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: var(--accent);
    flex: none;
  }
  .panel-head .right { margin-left: auto; letter-spacing: 0.08em; }

  /* The canvas gets a real box of its own. An aspect-ratio rather than a fixed
     height is what makes it survive a phone. */
  .trace-box {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    min-height: 210px;
  }
  #trackmap {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
  }

  .readout-inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--line);
    border-top: 1px solid var(--line);
    margin-top: auto;
  }
  .cell { background: var(--surface); padding: 11px 14px; }
  .cell .k {
    display: block;
    font-size: 9.5px;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 2px;
  }
  .cell .v {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    font-variant-numeric: tabular-nums;
  }
  .cell .v small { font-size: 10.5px; color: var(--muted); margin-left: 3px; font-weight: 400; }
  .cell.live .v { color: var(--accent); }

  /* The terminal. Real `lab check` output - the format .lab/validate.py prints
     and numbers from runs recorded in the lab's FINDINGS.md. */
  .term {
    font-family: var(--mono);
    /* It is terminal output: the line breaks are the content. Without this the
       whole verdict collapses into one run-on paragraph. */
    white-space: pre;
    font-size: 12.5px;
    line-height: 1.75;
    padding: 16px 18px 18px;
    color: var(--ink-2);
    overflow-x: auto;
    flex: 1;
  }
  .term .p { color: var(--accent); }
  .term .c { color: var(--muted); }
  .term .ok { color: var(--accent); font-weight: 600; }
  .term .w { color: var(--ink); font-weight: 600; }
  .term .cursor {
    display: inline-block;
    width: 7px; height: 14px;
    background: var(--accent);
    vertical-align: -2px;
    animation: blink 1.1s step-end infinite;
  }
  @keyframes blink { 50% { opacity: 0; } }
  @media (prefers-reduced-motion: reduce) { .term .cursor { animation: none; } }

  .trace-cap {
    padding: 10px 16px 12px;
    border-top: 1px solid var(--line);
    font-size: 11.5px;
    color: var(--muted);
  }
  .trace-cap b { color: var(--ink-2); font-weight: 600; }

  h1 {
    font-family: var(--display);
    font-weight: 700;
    font-size: clamp(36px, 5.2vw, 64px);
    line-height: 1.04;
    letter-spacing: -0.028em;
    margin: 0 0 18px;
    /* 20ch sets the headline in two lines rather than three, which is what
       brings the panels up to the fold. */
    max-width: 20ch;
    text-wrap: balance;
  }
  h1 em { font-style: normal; color: var(--accent); }

  .standfirst {
    font-size: 20px;
    line-height: 1.5;
    color: var(--ink-2);
    max-width: 54ch;
    margin: 0 0 32px;
  }

  .cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }

  .btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-family: var(--sans);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    padding: 14px 22px;
    border: 1px solid var(--accent);
    background: var(--accent);
    color: var(--ground);   /* Ground on accent: 6.8:1. Foreground on accent: 2.5:1. */
    transition: background .16s ease, color .16s ease;
  }
  .btn:hover { background: var(--accent-l); border-color: var(--accent-l); }
  .btn.ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line-2);
  }
  .btn.ghost:hover { border-color: var(--accent); color: var(--accent-l); background: transparent; }

  .fineprint {
    font-family: var(--sans);
    font-size: 11.5px;
    letter-spacing: 0.06em;
    color: var(--muted);
  }

  /* ── the catalogue: courses drawn as a channel stack ───────────────── */

  .catalogue { margin-top: 44px; display: flex; flex-direction: column; gap: 14px; }

  .course {
    border: 1px solid var(--line);
    background: var(--surface);
  }

  .course-row {
    display: grid;
    grid-template-columns: 340px 1fr;
    align-items: stretch;
  }

  /* The left block is a parameter label, the way a data-acquisition display
     labels a channel: what it is, and what it is worth. */
  .course-id {
    padding: 26px 26px 24px;
    border-right: 1px solid var(--line);
  }
  .course-no {
    font-family: var(--sans);
    font-size: 11px;
    letter-spacing: 0.2em;
    color: var(--muted);
    display: block;
    margin-bottom: 9px;
  }
  .course-name {
    font-family: var(--display);
    font-weight: 700;
    font-size: 21px;
    line-height: 1.2;
    letter-spacing: -0.015em;
    margin: 0 0 12px;
    color: var(--ink);
  }
  .course-summary {
    margin: 0 0 14px;
    font-size: 15px;
    line-height: 1.5;
    color: var(--ink-2);
  }
  .course-meta {
    font-family: var(--sans);
    font-size: 11.5px;
    letter-spacing: 0.05em;
    color: var(--muted);
  }

  .status {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-family: var(--sans);
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-bottom: 12px;
  }
  .status::before {
    content: "";
    width: 7px; height: 7px;
    border-radius: 50%;
    background: currentColor;
  }
  .status.open { color: var(--accent); }
  .status.dark { color: var(--muted); }
  .status.dark::before { background: transparent; box-shadow: inset 0 0 0 1px var(--muted); }

  /* The trace lane. A live course carries a real channel off the lap; one that
     does not exist yet reads flat, which is what an unconnected channel
     actually looks like on an instrument. */
  .lane {
    position: relative;
    min-height: 132px;
    background:
      repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 76px),
      var(--raised);
  }
  .lane svg { display: block; width: 100%; height: 132px; }
  .lane-cap {
    position: absolute;
    left: 18px; bottom: 10px;
    font-family: var(--sans);
    font-size: 10.5px;
    letter-spacing: 0.1em;
    color: var(--muted);
  }
  .lane-cap b { color: var(--ink-2); font-weight: 500; }
  .nosignal {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--sans);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--muted);
  }

  .course.dark { background: transparent; }
  .course.dark .lane { background: transparent; }
  .course.dark .course-name { color: var(--ink-2); }

  /* modules, inside the open course */
  .modules {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--line);
  }
  .modules li { background: var(--surface); padding: 20px 22px 22px; }
  .modules .n {
    font-family: var(--sans);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--accent-d);
    display: block;
    margin-bottom: 8px;
  }
  .modules .t {
    font-family: var(--sans);
    font-weight: 600;
    font-size: 15.5px;
    letter-spacing: -0.01em;
    display: block;
    margin-bottom: 7px;
  }
  .modules .d {
    margin: 0 0 10px;
    font-size: 14.5px;
    line-height: 1.5;
    color: var(--ink-2);
  }
  .modules .g {
    margin: 0;
    font-family: var(--sans);
    font-size: 10.5px;
    line-height: 1.5;
    color: var(--muted);
  }

  @media (max-width: 980px) {
    .course-row { grid-template-columns: 1fr; }
    .course-id { border-right: 0; border-bottom: 1px solid var(--line); }
    .modules { grid-template-columns: repeat(2, 1fr); }
  }
  @media (max-width: 620px) {
    .modules { grid-template-columns: 1fr; }
  }

  .cat-foot {
    margin-top: 22px;
    font-family: var(--sans);
    font-size: 11.5px;
    line-height: 1.8;
    color: var(--muted);
  }

  /* ── comparison table ─────────────────────────────────────────────── */

  .scroller { overflow-x: auto; }

  .compare {
    min-width: 620px;
    width: 100%;
    border-collapse: collapse;
    margin-top: 34px;
    font-size: 15px;
  }
  .compare th, .compare td {
    text-align: left;
    padding: 15px 18px;
    border-top: 1px solid var(--line);
    vertical-align: top;
  }
  .compare thead th {
    font-family: var(--sans);
    font-size: 10.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--muted);
    border-top: 0;
    font-weight: 500;
  }
  .compare tbody td:first-child {
    font-family: var(--sans);
    font-size: 12px;
    color: var(--ink-2);
    white-space: nowrap;
  }
  .compare tbody td:nth-child(2) { color: var(--muted); }
  .compare thead th:last-child { color: var(--accent); }

  /* ── evidence ─────────────────────────────────────────────────────── */

  .evidence {
    margin-top: 30px;
    border: 1px solid var(--line);
    background: var(--surface);
    padding: 24px 26px;
    /* A simulated terminal readout - a URL and log lines - so this one keeps a
       monospace: the design system's --font-mono stack. */
    font-family: var(--mono);
    font-size: 12.5px;
    line-height: 2;
    color: var(--ink-2);
    overflow-x: auto;
  }
  .evidence .h { color: var(--ink); }
  .evidence .ok { color: var(--accent); }
  .evidence .m {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.14em;
    font-size: 10.5px;
  }

  footer {
    border-top: 1px solid var(--line);
    padding: 54px 0 70px;
    color: var(--muted);
    font-size: 14.5px;
  }
  footer a { color: var(--ink-2); }

/* ── skip link, nav ────────────────────────────────────────────────── */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--ground);
  font-family: var(--sans);
  font-size: 13px;
  padding: 12px 18px;
  text-decoration: none;
}
.skip:focus { left: 0; }

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 26px;
  height: 62px;
}
.nav-brand { text-decoration: none; flex: none; display: inline-flex; align-items: center; gap: 10px; }
/* The ATLAS product icon, used as supplied - never redrawn. */
.logo { display: block; flex: none; width: 26px; height: 26px; }
.nav-brand .mark {
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
}
.nav-links {
  display: flex;
  gap: 24px;
  margin-left: auto;
  align-items: center;
}
.nav-links a {
  font-family: var(--sans);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  text-decoration: none;
}
.nav-links a:hover { color: var(--accent); }
.btn-sm { padding: 9px 15px; font-size: 11px; flex: none; }

/* Below 880px the links would crowd the button off the row. The brand and the
   one action that matters stay; the links are all anchors to sections the
   reader is about to scroll through anyway. */
@media (max-width: 880px) {
  .nav-links { display: none; }
  .btn-sm { margin-left: auto; }
}
@media (max-width: 420px) {
  .nav-brand .mark { font-size: 10px; letter-spacing: 0.12em; }
  .btn-sm { padding: 8px 11px; font-size: 10px; letter-spacing: 0.05em; }
}

/* ── FAQ ───────────────────────────────────────────────────────────── */

.faq { margin-top: 34px; border-top: 1px solid var(--line); }
.faq details {
  border-bottom: 1px solid var(--line);
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 20px 40px 20px 0;
  position: relative;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 17.5px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 8px;
  top: 18px;
  font-family: var(--sans);
  font-size: 20px;
  color: var(--muted);
  line-height: 1;
}
.faq details[open] summary::after { content: "–"; }
.faq summary:hover { color: var(--accent); }
.faq .a {
  margin: 0;
  padding: 0 40px 24px 0;
  color: var(--ink-2);
  max-width: 68ch;
}

/* ── course page ───────────────────────────────────────────────────── */

.crumbs {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 22px;
}
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--accent); }

.course-hero { padding: 64px 0 0; border-bottom: 1px solid var(--line); }
.course-hero h1 {
  font-size: clamp(32px, 4.6vw, 52px);
  max-width: 20ch;
  margin-bottom: 20px;
}
.course-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin: 40px 0 0;
}
.course-facts div { background: var(--surface); padding: 16px 18px; }
.course-facts dt {
  font-family: var(--sans);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 5px;
}
.course-facts dd {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  color: var(--ink);
}
@media (max-width: 760px) {
  .course-facts { grid-template-columns: repeat(2, 1fr); }
}

.steps { list-style: none; margin: 34px 0 0; padding: 0; }
.steps li {
  border-top: 1px solid var(--line);
  padding: 26px 0;
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
}
.steps li:last-child { border-bottom: 1px solid var(--line); }
.steps .n {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent-d);
  padding-top: 4px;
}
.steps h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.015em;
  margin: 0 0 8px;
}
.steps p { margin: 0 0 8px; color: var(--ink-2); }
.steps .g {
  font-family: var(--sans);
  font-size: 11px;
  color: var(--muted);
  margin: 0;
}
@media (max-width: 620px) {
  .steps li { grid-template-columns: 1fr; gap: 8px; }
}

/* ── footer ────────────────────────────────────────────────────────── */

footer {
  border-top: 1px solid var(--line);
  padding: 58px 0 64px;
  color: var(--muted);
  font-size: 14.5px;
}
.foot-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}
.foot-brand .brand-row { display: flex; align-items: center; gap: 12px; }
.foot-brand .logo { width: 32px; height: 32px; }
.foot-brand .mark {
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink);
}
.foot-brand p { margin: 16px 0 0; max-width: 42ch; }
.foot-col h2 {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
  margin: 0 0 14px;
}
.foot-col ul { list-style: none; margin: 0; padding: 0; }
.foot-col li { margin-bottom: 9px; }
.foot-col a { color: var(--muted); text-decoration: none; font-size: 14px; }
.foot-col a:hover { color: var(--accent); }
.foot-base {
  margin-top: 48px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}
.foot-base p { margin: 0 0 10px; max-width: 62ch; font-size: 13.5px; }
.foot-note {
  font-family: var(--sans);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--line-2);
}
@media (max-width: 860px) {
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .foot-brand { grid-column: 1 / -1; }
}
@media (max-width: 460px) {
  .foot-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .hero { padding: 36px 0 52px; }
  .band { padding: 60px 0; }
  /* Two columns of readout rather than three, so the values stay legible
     instead of shrinking to fit a phone. */
  .readout-inner { grid-template-columns: repeat(2, 1fr); }
  .term { font-size: 11.5px; }
}

/* ── the loop ──────────────────────────────────────────────────────── */
/* Numbered because this genuinely is a sequence: you cannot submit before you
   change something, and you cannot be marked before you submit. */

.loop {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.loop li {
  background: var(--surface);
  padding: 26px 24px 28px;
}
.loop .n {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 14px;
}
.loop h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.015em;
  margin: 0 0 9px;
}
.loop p { margin: 0; font-size: 15px; color: var(--ink-2); }
.loop code {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
  background: var(--raised);
  padding: 1px 5px;
}
@media (max-width: 860px) {
  .loop { grid-template-columns: 1fr; }
}


/* The course title is a link but should read as a title, not as raw hypertext. */
.course-name a {
  color: inherit;
  text-decoration: none;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 1px;
}
.course-name a:hover { color: var(--accent); }

/* The three commands, as the Start section's one visual. */
.commands {
  margin: 26px 0 0;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: var(--surface);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink);
  overflow-x: auto;
}
.commands .c { color: var(--muted); }

/* ── course page ───────────────────────────────────────────────────── */

/* The steps ran the full 1085px, so a one-line module summary set on a
   900px measure. Cap the text, keep the number column. */
.steps li { grid-template-columns: 120px minmax(0, 62ch); }

.prereq {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  margin-top: 6px;
}
.prereq > div { background: var(--surface); padding: 24px 26px 26px; }
.prereq h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  margin: 0 0 14px;
  color: var(--accent);
}
.prereq ul { margin: 0; padding: 0; list-style: none; }
.prereq li {
  padding: 7px 0 7px 20px;
  position: relative;
  color: var(--ink-2);
  font-size: 15px;
  border-top: 1px solid var(--line);
}
.prereq li:first-child { border-top: 0; }
.prereq li::before {
  content: "";
  position: absolute;
  left: 0; top: 15px;
  width: 8px; height: 1px;
  background: var(--line-2);
}
.prereq-note { margin: 20px 0 0; max-width: 68ch; color: var(--muted); font-size: 14.5px; }
@media (max-width: 720px) {
  .prereq { grid-template-columns: 1fr; }
}

/* Inline code sat on a background with padding, so a wrapped `docker compose
   up` broke mid-phrase and read as three separate chips. */
code {
  font-family: var(--mono);
  font-size: 0.88em;
  color: var(--ink);
  white-space: nowrap;
}

/* The course hero panel is shorter than the landing one - it is supporting
   evidence here, not the headline act. */
.course-hero .trace-box { aspect-ratio: 16 / 8; min-height: 170px; }
.course-hero .readout-inner { grid-template-columns: repeat(3, 1fr); }
.course-hero .hero-panels { margin-top: 30px; }
.course-facts { margin-top: 30px; }