/* ==========================================================================
   OX Labs — style.css
   Old-money: cream + dark navy + burnished gold. EB Garamond throughout.
   Sentence case, hairline rules, square corners, generous whitespace.
   No animations, no gradients, no hover effects beyond underlines.
   ========================================================================== */

:root {
  --cream: #f9f7f4;
  --cream-deep: #f2efe9;
  --navy: #1a1f36;
  --navy-deep: #12162a;
  --ink: #2b2f3a;
  --ink-soft: #575c68;
  --gold: #8b7355;
  --gold-light: #a89475;
  --rule: rgba(26, 31, 54, 0.16);
  --rule-strong: rgba(26, 31, 54, 0.38);
  --rule-light: rgba(249, 247, 244, 0.22);
  --cream-muted: rgba(249, 247, 244, 0.75);
  --font-serif: "EB Garamond", Garamond, Georgia, "Times New Roman", serif;
  --header-h: 76px;
}

/* ---------- Reset & base ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--ink);
  background-color: var(--cream);
  -webkit-font-smoothing: antialiased;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3 {
  font-weight: 500;
  line-height: 1.2;
  color: var(--navy);
  text-wrap: balance;
}

.container {
  width: 100%;
  max-width: 1000px;
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 10px 16px;
  background: var(--navy);
  color: var(--cream);
}

.skip-link:focus {
  left: 0;
}

/* ---------- Shared bits ---------- */

.eyebrow {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--gold);
  margin-bottom: 18px;
}

.section {
  padding-block: 64px;
}

.section-bordered {
  border-top: 1px solid var(--rule);
}

.section-head {
  max-width: 620px;
  margin-bottom: 52px;
}

.section-head h2 {
  font-size: clamp(1.8rem, 1.3rem + 2.2vw, 2.5rem);
}

/* Navy bands */

.section-navy {
  background: var(--navy);
  color: var(--cream-muted);
}

.section-navy h2,
.section-navy h3 {
  color: var(--cream);
}

.section-navy .eyebrow {
  color: var(--gold-light);
}

/* ---------- Buttons & links ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 34px;
  border: 1px solid var(--navy);
  border-radius: 0;
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 500;
  line-height: 1.2;
  cursor: pointer;
  background: var(--navy);
  color: var(--cream);
}

.btn:hover {
  background: var(--navy-deep);
  border-color: var(--navy-deep);
}

.btn-small {
  padding: 9px 22px;
  font-size: 0.98rem;
}

.text-link {
  font-size: 1.05rem;
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.text-link:hover {
  text-decoration: underline;
}

/* ---------- Header ---------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  background: var(--cream);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  border-bottom-color: var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--navy);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-link {
  font-size: 1rem;
  color: var(--navy);
}

.nav-link:hover,
.nav-link.active {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.nav-cta {
  margin-left: 8px;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 11px;
  background: none;
  border: 1px solid var(--rule-strong);
  cursor: pointer;
}

.nav-toggle-bar {
  display: block;
  height: 1px;
  width: 100%;
  background: var(--navy);
}

/* ---------- Hero ---------- */

.hero {
  padding-top: calc(var(--header-h) + 96px);
  padding-bottom: 96px;
  border-bottom: 1px solid var(--rule);
}

.hero .eyebrow {
  padding-top: 24px;
  border-top: 1px solid var(--rule-strong);
  display: inline-block;
}

.hero h1 {
  font-size: clamp(2.4rem, 1.6rem + 4vw, 3.8rem);
  max-width: 18ch;
}

.hero-sub {
  margin-top: 26px;
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 54ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 30px;
  margin-top: 44px;
}

/* ---------- Ruled grids (Problem, How it works) ---------- */

.rule-grid {
  display: grid;
  gap: 36px;
}

.rule-item {
  border-top: 1px solid var(--rule);
  padding-top: 22px;
}

.section-navy .rule-item {
  border-top-color: var(--rule-light);
}

.numeral {
  display: block;
  font-size: 1rem;
  font-style: italic;
  color: var(--gold);
  margin-bottom: 12px;
}

.section-navy .numeral {
  color: var(--gold-light);
}

.rule-item h3 {
  font-size: 1.28rem;
  margin-bottom: 10px;
}

.rule-item p {
  font-size: 1rem;
  color: var(--ink-soft);
}

.section-navy .rule-item p {
  color: var(--cream-muted);
}

/* ---------- Deliverables ---------- */

.deliver-cols {
  display: grid;
  gap: 34px;
  margin-bottom: 64px;
}

.deliver-item {
  border-top: 1px solid var(--rule);
  padding-top: 22px;
}

.deliver-item h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.deliver-item p {
  font-size: 0.98rem;
  color: var(--ink-soft);
}

/* ---------- Sample ledger ---------- */

.ledger {
  border: 1px solid var(--rule-strong);
  background: var(--cream-deep);
}

.ledger-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--rule-strong);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--navy);
}

.ledger-period {
  font-style: italic;
  font-weight: 400;
  color: var(--gold);
}

.ledger-scroll {
  overflow-x: auto;
}

.ledger table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.ledger th {
  text-align: left;
  font-weight: 400;
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink-soft);
  padding: 12px 24px 8px;
  border-bottom: 1px solid var(--rule);
}

.ledger td {
  padding: 14px 24px;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
  color: var(--ink);
}

.ledger tbody tr:last-child td {
  border-bottom: none;
}

.ledger .num {
  text-align: right;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.ledger-op {
  display: block;
  font-size: 0.85rem;
  font-style: italic;
  color: var(--ink-soft);
}

.ledger .ok {
  color: var(--ink-soft);
  font-style: italic;
}

.ledger .flag {
  color: var(--gold);
  font-style: italic;
}

.ledger .mark {
  display: inline-block;
  width: 1.2em;
  font-style: normal;
}

.mark-flag {
  font-weight: 600;
}

.ledger-note {
  padding: 12px 24px;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  font-style: italic;
  color: var(--ink-soft);
}

/* ---------- Who it's for ---------- */

.who-cols {
  display: grid;
  gap: 44px;
}

.who-col {
  border-top: 1px solid var(--rule);
  padding-top: 26px;
}

.who-col h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.who-col p {
  color: var(--ink-soft);
  max-width: 50ch;
}

.also-fits {
  margin-top: 48px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 0.98rem;
  font-style: italic;
  color: var(--ink-soft);
}

/* ---------- Why list ---------- */

.why-list {
  display: grid;
  gap: 0;
}

.why-item {
  padding: 28px 0;
  border-top: 1px solid var(--rule);
}

.why-item:first-child {
  border-top: none;
  padding-top: 0;
}

.why-item h3 {
  font-size: 1.28rem;
  margin-bottom: 8px;
}

.why-item p {
  color: var(--ink-soft);
  max-width: 62ch;
}

/* ---------- What else we build ---------- */

.section-else .section-head {
  margin-bottom: 38px;
}

.section-else .section-head h2 {
  font-size: clamp(1.5rem, 1.2rem + 1.4vw, 1.9rem);
}

.else-grid {
  display: grid;
  gap: 24px;
}

.else-item {
  border-top: 1px solid var(--rule);
  padding-top: 16px;
}

.else-item h3 {
  font-size: 1.12rem;
  margin-bottom: 4px;
}

.else-item p {
  font-size: 0.94rem;
  color: var(--ink-soft);
  max-width: 58ch;
}

/* ---------- Closing CTA ---------- */

.cta-inner {
  display: grid;
  justify-items: center;
  text-align: center;
  gap: 30px;
}

.cta-inner h2 {
  font-size: clamp(1.6rem, 1.2rem + 1.8vw, 2.2rem);
  max-width: 24ch;
}

.btn-invert {
  background: var(--cream);
  border-color: var(--cream);
  color: var(--navy);
}

.btn-invert:hover {
  background: var(--cream-deep);
  border-color: var(--cream-deep);
}

/* ---------- FAQ ---------- */

.faq-list {
  display: grid;
  gap: 0;
}

.faq-item {
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}

.faq-item h3 {
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.faq-item p {
  color: var(--ink-soft);
  max-width: 62ch;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--navy);
  color: var(--cream-muted);
  padding-block: 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-start;
  font-size: 0.98rem;
}

.footer-brand {
  color: var(--cream);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
}

.footer-meta a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- Mobile nav (<= 800px) ---------- */

@media (max-width: 800px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 24px 28px;
    background: var(--cream);
    border-bottom: 1px solid var(--rule);
    display: none;
  }

  .site-nav.open {
    display: flex;
  }

  .nav-link {
    padding: 14px 2px;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--rule);
  }

  .nav-cta {
    margin: 20px 0 0;
  }
}

/* ---------- Larger screens ---------- */

@media (min-width: 620px) {
  .rule-grid-4 {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 44px;
    row-gap: 48px;
  }
}

@media (min-width: 801px) {
  .section {
    padding-block: 80px;
  }
}

@media (min-width: 920px) {
  .rule-grid-4 {
    grid-template-columns: repeat(4, 1fr);
    column-gap: 36px;
  }

  .deliver-cols {
    grid-template-columns: repeat(3, 1fr);
    column-gap: 44px;
  }

  .who-cols {
    grid-template-columns: 1fr 1fr;
    gap: 60px;
  }

  .why-list,
  .faq-list {
    grid-template-columns: 1fr 1fr;
    column-gap: 68px;
  }

  .else-grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 60px;
    row-gap: 32px;
  }

  .why-item:nth-child(2),
  .faq-item:nth-child(2) {
    border-top: none;
    padding-top: 0;
  }

  .footer-inner {
    flex-direction: row;
    align-items: baseline;
    justify-content: space-between;
  }
}