/* RigLedger site. One stylesheet, no build step, no web fonts.
   The palette is the workbook's own: teal header bars, yellow "type here" cells,
   grey result cells, gridline grey, white paper. */

:root {
  color-scheme: light dark;

  --paper: #fbfbf9;
  --surface: #ffffff;
  --ink: #17211f;
  --ink-2: #4f5b59;
  --rule: #d3d9d5;
  --teal: #1f5f6b;
  --teal-hover: #184d57;
  --teal-ink: #ffffff;
  --cell-in: #fff2cc;
  --cell-in-edge: #dcc25f;
  --cell-out: #eaeff1;
  --link: #1b5560;
  --focus: #1f5f6b;

  --wrap: 1120px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121a1b;
    --surface: #182224;
    --ink: #e5eae8;
    --ink-2: #a3aeab;
    --rule: #2e3b3d;
    --teal: #6fbac5;
    --teal-hover: #8ccbd4;
    --teal-ink: #0f1a1b;
    --cell-in: #3a3318;
    --cell-in-edge: #7a6a2a;
    --cell-out: #1f2b2d;
    --link: #8fcbd3;
    --focus: #f2d77a;
  }
}

/* ---------- base ---------- */

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.55;
}

@media (min-width: 48em) {
  body { font-size: 1.125rem; }
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

p { margin: 0 0 1rem; }

ul { padding-left: 1.25rem; }

li { margin-bottom: 0.4rem; }

h1, h2, h3 {
  font-weight: 700;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0;
}

h2 { font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2rem); }

h3 { font-size: 1.3rem; }

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

.skip {
  position: absolute;
  left: -999px;
  top: 0;
  padding: 0.5rem 1rem;
  background: var(--surface);
  color: var(--ink);
}

.skip:focus { left: 1rem; top: 1rem; z-index: 10; }

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.measure { max-width: 62ch; }

.muted { color: var(--ink-2); }

.small { font-size: 0.9rem; }

/* ---------- header ---------- */

.site-head { border-bottom: 1px solid var(--rule); }

.site-head .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.wordmark svg { width: 1.4rem; height: 1.4rem; }

.site-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.95rem;
}

.site-nav a { color: var(--ink); text-decoration: none; }

.site-nav a:hover { text-decoration: underline; }

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  padding: 0.7rem 1.15rem;
  border: 1.5px solid var(--teal);
  border-radius: 3px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
}

.btn-solid {
  background: var(--teal);
  color: var(--teal-ink);
}

.btn-solid:hover {
  background: var(--teal-hover);
  border-color: var(--teal-hover);
}

.btn-line {
  background: transparent;
  color: var(--link);
}

.btn-line:hover { background: var(--cell-out); }

/* ---------- hero ---------- */

.hero .wrap {
  display: grid;
  gap: 2.25rem;
  padding-block: clamp(2.5rem, 7vw, 5rem);
}

@media (min-width: 56em) {
  .hero .wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(2rem, 5vw, 4.5rem);
  }
}

.hero h1 {
  font-size: clamp(2rem, 1.2rem + 3.6vw, 3.25rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 17ch;
  margin-bottom: 1rem;
}

.hero-sub {
  color: var(--ink-2);
  font-size: clamp(1.1rem, 1rem + 0.6vw, 1.35rem);
  line-height: 1.45;
  max-width: 32ch;
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}

/* The worked example. Same conventions as the workbook:
   yellow = type here, grey and bold = result. */

.ledger {
  width: 100%;
  max-width: 30rem;
  border: 1px solid var(--rule);
  border-collapse: collapse;
  background: var(--surface);
  font-variant-numeric: tabular-nums;
}

.ledger th,
.ledger td {
  border: 1px solid var(--rule);
  padding: 0.6rem 0.8rem;
  font-weight: 400;
  text-align: left;
  vertical-align: middle;
}

.ledger th { color: var(--ink); }

.ledger td {
  min-width: 6.5rem;
  text-align: right;
  white-space: nowrap;
}

.ledger .in { background: var(--cell-in); }

.ledger .out {
  background: var(--cell-out);
  font-weight: 700;
}

.ledger .key th { font-weight: 700; }

.ledger caption {
  caption-side: bottom;
  padding-top: 0.7rem;
  color: var(--ink-2);
  font-size: 0.85rem;
  line-height: 1.45;
  text-align: left;
}

/* ---------- sections ---------- */

.section .wrap { padding-block: clamp(2rem, 6vw, 4rem); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.section-head p {
  margin: 0;
  color: var(--ink-2);
}

/* products: each one is a ledger row, description left, amount right */

.product {
  display: grid;
  gap: 1.25rem;
  padding-block: 2rem;
  border-top: 1px solid var(--rule);
}

.product:last-of-type { border-bottom: 1px solid var(--rule); }

@media (min-width: 56em) {
  .product {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    padding-block: 2.75rem;
  }
}

.shot { margin: 0; }

.shot a {
  display: block;
  border-radius: 4px;
}

.shot img {
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
}

@media (prefers-color-scheme: dark) {
  .shot img { filter: brightness(0.9); }
}

.shot figcaption {
  margin-top: 0.5rem;
  color: var(--ink-2);
  font-size: 0.85rem;
}

.product-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.price {
  font-size: 1.3rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.product p { margin: 0.75rem 0 0; }

.facts {
  color: var(--ink-2);
  font-size: 0.95rem;
}

.buy {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

/* free sheet */

.free .wrap {
  display: grid;
  gap: 2rem;
}

@media (min-width: 56em) {
  .free .wrap {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: clamp(2rem, 5vw, 4rem);
  }
}

.free h2 { margin-bottom: 1rem; }

.signup {
  min-height: 8rem;
  margin-top: 1.25rem;
  padding: 1.25rem;
  border: 1.5px dashed var(--cell-in-edge);
  border-radius: 4px;
  background: var(--cell-in);
}

.signup-note {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.9rem;
}

/* about */

.about .wrap { padding-top: 0; }

.about h2 { margin-bottom: 1rem; }

/* ---------- inner pages (bonus, privacy, 404) ---------- */

.page .wrap {
  max-width: 46rem;
  padding-block: clamp(2.5rem, 7vw, 4.5rem);
}

.page h1 {
  font-size: clamp(1.9rem, 1.3rem + 2.6vw, 2.75rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.page h2 {
  font-size: 1.35rem;
  margin: 2rem 0 0.6rem;
}

.page .lede {
  color: var(--ink-2);
  font-size: 1.15rem;
  line-height: 1.45;
}

.pack {
  display: grid;
  gap: 1.25rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.pack li {
  margin: 0;
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface);
}

.pack h3 { margin-bottom: 0.4rem; }

.pack p { margin: 0; }

.pack p + p { margin-top: 0.5rem; }

.page .signup { margin-top: 1.5rem; }

/* ---------- footer ---------- */

.site-foot {
  margin-top: 2rem;
  border-top: 1px solid var(--rule);
}

.site-foot .wrap {
  display: grid;
  gap: 0.5rem;
  padding-block: 2rem 2.5rem;
  color: var(--ink-2);
  font-size: 0.875rem;
  line-height: 1.5;
}

.site-foot p {
  margin: 0;
  max-width: 80ch;
}

.site-foot .legal {
  color: var(--ink);
  font-weight: 600;
}

.site-foot nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}