/* Workbook and pre-work pages. Same tokens as the presenter deck. */
:root {
  --paper: #ffffff;
  --ink: #1d1d1f;
  --graphite: #6e6e73;
  --mist: #f5f5f7;
  --rule: #d2d2d7;
  --signal: #0071e3;
  --signal-ink: #0066cc;
  --good: #1d7a3a;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #000000; --ink: #f5f5f7; --graphite: #a1a1a6; --mist: #1c1c1e; --rule: #38383a;
    --signal: #2997ff; --signal-ink: #2997ff; --good: #30d158;
  }
}
:root[data-theme="dark"] {
  --paper: #000000; --ink: #f5f5f7; --graphite: #a1a1a6; --mist: #1c1c1e; --rule: #38383a;
  --signal: #2997ff; --signal-ink: #2997ff; --good: #30d158;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 84px; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 17px/1.55 var(--font); letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--signal-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 2px; border-radius: 6px; }

/* Top bar with the six-rung ladder */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 86%, transparent);
  backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--rule);
}
.top-inner { max-width: 1120px; margin: 0 auto; padding: 12px 22px; display: flex; align-items: center; gap: 24px; }
.brand { font-weight: 600; font-size: 15px; color: var(--ink); white-space: nowrap; }
.ladder { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; flex: 1; }
.ladder a { font-size: 12px; color: var(--graphite); border-top: 3px solid var(--rule); padding-top: 5px; text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ladder a.done { border-color: var(--good); color: var(--ink); }
@media (max-width: 720px) { .ladder a span { display: none; } .brand { font-size: 14px; } }

/* Layout */
.wrap { max-width: 760px; margin: 0 auto; padding: 0 22px 120px; }
.hero { padding: 72px 0 40px; }
.hero h1 { font-size: clamp(40px, 7vw, 64px); line-height: 1.04; letter-spacing: -0.035em; margin: 0; font-weight: 700; }
.hero p { font-size: 21px; line-height: 1.45; color: var(--graphite); margin: 18px 0 0; max-width: 620px; }
.hero .actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; font: 600 16px var(--font); padding: 12px 22px; border-radius: 999px;
  background: var(--signal); color: #fff; border: 0; cursor: pointer; text-decoration: none;
}
.btn:hover { text-decoration: none; filter: brightness(1.06); }
.btn.quiet { background: var(--mist); color: var(--ink); }

section.lab, section.block { border-top: 1px solid var(--rule); padding: 56px 0 8px; }
.lab-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; }
h2 { font-size: clamp(30px, 5vw, 40px); letter-spacing: -0.03em; line-height: 1.1; margin: 0; font-weight: 700; }
.rung { font-size: 15px; color: var(--graphite); margin: 0 0 6px; }
.youll { font-size: 19px; color: var(--graphite); margin: 12px 0 28px; }
h3 { font-size: 21px; letter-spacing: -0.02em; margin: 34px 0 10px; }
p, li { max-width: 68ch; }
ol.steps { padding-left: 0; list-style: none; counter-reset: s; margin: 0; }
ol.steps > li { counter-increment: s; position: relative; padding: 0 0 18px 46px; }
ol.steps > li::before {
  content: counter(s); position: absolute; left: 0; top: 0;
  width: 30px; height: 30px; border-radius: 50%; background: var(--mist);
  font-weight: 600; font-size: 15px; display: grid; place-items: center; font-variant-numeric: tabular-nums;
}
.path { font-weight: 600; }
kbd, code {
  font-family: var(--mono); font-size: 0.88em; background: var(--mist); padding: 2px 6px; border-radius: 6px;
}
.menu { font-weight: 600; }

/* Prompt to copy */
.prompt { position: relative; margin: 14px 0 22px; background: var(--mist); border-radius: 18px; padding: 20px 22px 20px; }
.prompt pre { margin: 0; white-space: pre-wrap; font: 16px/1.55 var(--font); }
.prompt pre.cmd { font: 15px/1.5 var(--mono); }
.prompt .copy {
  margin-top: 14px; font: 600 14px var(--font); padding: 8px 16px; border-radius: 999px;
  background: var(--paper); color: var(--ink); border: 1px solid var(--rule); cursor: pointer;
}
.prompt .copy.ok { color: var(--good); border-color: var(--good); }

.check { border-left: 3px solid var(--good); padding: 4px 0 4px 16px; margin: 22px 0; }
.check strong { color: var(--good); }
details { border: 1px solid var(--rule); border-radius: 14px; padding: 14px 18px; margin: 12px 0; }
details summary { cursor: pointer; font-weight: 600; }
details[open] summary { margin-bottom: 8px; }
.bonus { background: var(--mist); border-radius: 14px; padding: 16px 18px; margin: 22px 0; }
.done-toggle { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; margin: 18px 0 0; cursor: pointer; }
.done-toggle input { width: 20px; height: 20px; accent-color: var(--good); }

table { border-collapse: collapse; width: 100%; font-size: 16px; margin: 12px 0 20px; }
th, td { text-align: left; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-weight: 600; }
dl.gloss dt { font-weight: 600; margin-top: 16px; }
dl.gloss dd { margin: 4px 0 0; color: var(--graphite); }
.note { color: var(--graphite); font-size: 15px; }
footer { color: var(--graphite); font-size: 14px; padding-top: 48px; border-top: 1px solid var(--rule); margin-top: 48px; }