/* Freight paperwork: paper, ink, ruled fields, monospaced figures. Red only marks corrections. */
:root {
  --paper: #f6f4ef;
  --sheet: #fffefb;
  --ink: #18212e;
  --ink-2: #3a4452;
  --muted: #6c727c;
  --rule: #dcd7cc;
  --rule-strong: #b9b2a3;
  --red: #b42318;
  --max: 1120px;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", "Segoe UI Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
}

a { color: inherit; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.num { text-align: right; white-space: nowrap; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* Header */
.top { border-bottom: 1px solid var(--rule); }
.top-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; text-decoration: none; letter-spacing: -0.01em; }
.mark { width: 14px; height: 14px; border: 2px solid var(--ink); position: relative; }
.mark::after { content: ""; position: absolute; left: 2px; right: 2px; top: 4px; height: 2px; background: var(--red); }
nav { display: flex; gap: 24px; font-size: 14px; }
nav a { text-decoration: none; color: var(--ink-2); }
nav a:hover { color: var(--ink); }
.nav-cta { border-bottom: 1px solid var(--ink); color: var(--ink) !important; }

/* Labels */
.label, .field, .num-label, .doc figcaption, .ruled li span:first-child, .facts dt, .rates th {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Hero */
.hero { padding: 80px 0 88px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 64px; align-items: center; }
.label { margin: 0 0 18px; }
h1 {
  margin: 0 0 22px;
  font-size: clamp(34px, 4.6vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 680;
}
.lead { margin: 0 0 30px; max-width: 560px; font-size: 18px; color: var(--ink-2); }
.fine { margin: 18px 0 0; font-size: 13px; color: var(--muted); }

.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-block;
  padding: 12px 18px;
  border: 1px solid var(--ink);
  border-radius: 2px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 550;
}
.btn:hover { background: var(--sheet); }
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: #2b3647; }

/* Sample invoice */
.doc {
  margin: 0;
  background: var(--sheet);
  border: 1px solid var(--rule-strong);
  padding: 22px 22px 14px;
}
.doc-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 2px solid var(--ink);
  border-left: 1px solid var(--rule);
  margin-bottom: 14px;
  font-size: 14px;
}
.doc-head > div { padding: 8px 10px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.field { display: block; font-size: 10.5px; margin-bottom: 2px; }
.doc-lines { width: 100%; border-collapse: collapse; font-size: 14px; }
.doc-lines td { padding: 9px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.doc-lines .note { display: block; margin-top: 2px; font-size: 12.5px; color: var(--red); }
.doc-lines s { color: var(--muted); text-decoration-color: var(--red); text-decoration-thickness: 1.5px; }
.doc-lines .fix { display: block; color: var(--red); }
.flag td:first-child { border-left: 2px solid var(--red); padding-left: 10px; }
.doc-lines tfoot td { border-bottom: 0; padding: 7px 0; color: var(--ink-2); }
.doc-lines tfoot tr:first-child td { border-top: 2px solid var(--ink); padding-top: 10px; }
.doc-lines .total td { font-weight: 650; color: var(--red); }
.doc figcaption { margin-top: 10px; font-size: 10.5px; }

/* Sections */
section { border-top: 1px solid var(--rule); padding: 64px 0; }
.hero { border-top: 0; }
.row { display: grid; grid-template-columns: 260px 1fr; gap: 40px; }
h2 { margin: 0; font-size: 20px; font-weight: 650; letter-spacing: -0.01em; }
.num-label { display: block; margin-bottom: 6px; }
p { margin: 0 0 14px; }
.aside { margin: 22px 0 0; font-size: 14.5px; color: var(--muted); max-width: 680px; }

.ruled { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.ruled li { display: grid; grid-template-columns: 160px 1fr; gap: 16px; padding: 11px 0; border-bottom: 1px solid var(--rule); }
.ruled li span:first-child { padding-top: 3px; }

.boxes {
  margin: 0; padding: 0; list-style: none;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 2px solid var(--ink); border-left: 1px solid var(--rule);
}
.boxes li { padding: 14px 16px 18px; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: var(--sheet); font-size: 14.5px; color: var(--ink-2); }
.boxes strong { display: block; margin: 6px 0 6px; color: var(--ink); font-size: 15px; }
.box-no { font-family: var(--mono); font-size: 12px; color: var(--muted); }

.facts { margin: 0; border-top: 1px solid var(--ink); }
.facts > div { display: grid; grid-template-columns: 160px 1fr; gap: 16px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.facts dt { padding-top: 3px; }
.facts dd { margin: 0; }

.rates { width: 100%; border-collapse: collapse; font-size: 15px; border-top: 1px solid var(--ink); }
.rates th { text-align: left; font-weight: 400; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--rule); }
.rates td { padding: 12px 12px 12px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.rates td:first-child { font-weight: 600; white-space: nowrap; }
.rates th.num, .rates td.num { padding-right: 0; }

.faq { border-top: 1px solid var(--ink); }
.faq details { border-bottom: 1px solid var(--rule); padding: 12px 0; }
.faq summary { cursor: pointer; font-weight: 550; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--mono); color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq details p { margin: 8px 0 0; color: var(--ink-2); }

.end { background: var(--ink); color: var(--paper); border-top: 0; padding: 72px 0; }
.end-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px; }
.end h2 { font-size: clamp(24px, 3vw, 32px); letter-spacing: -0.02em; }
.end .btn { border-color: var(--paper); }
.end .btn:hover { background: #2b3647; }
.end .btn-ink { background: var(--paper); color: var(--ink); }
.end .btn-ink:hover { background: #e9e5db; }

.foot { padding: 24px 0; font-size: 13px; color: var(--muted); }
.foot-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }

a:focus-visible, summary:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
  .boxes { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .wrap { padding: 0 16px; }
  .hero { padding: 48px 0 56px; }
  section { padding: 48px 0; }
  nav a:not(.nav-cta) { display: none; }
  .row { grid-template-columns: 1fr; gap: 18px; }
  .ruled li, .facts > div { grid-template-columns: 1fr; gap: 2px; }
  .boxes { grid-template-columns: 1fr; }
  .doc { padding: 16px 14px 10px; }
  .rates td:nth-child(2) { font-size: 14px; }
}

/* Hero invoice, animated in four steps (14 s loop): invoice, quote matched, marked, dispute draft.
   Everything keeps its space from the start (opacity and colour only), so nothing shifts. */
.doc { position: relative; --loop: 14s; }
.doc-steps {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px;
  margin: 0 0 14px; padding: 0; list-style: none;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--muted);
}
.doc-steps li { padding-top: 6px; border-top: 2px solid var(--rule); animation: step var(--loop) infinite; }
.doc-steps li:nth-child(2) { animation-delay: calc(var(--loop) * 0.25); }
.doc-steps li:nth-child(3) { animation-delay: calc(var(--loop) * 0.5); }
.doc-steps li:nth-child(4) { animation-delay: calc(var(--loop) * 0.75); }
.src { grid-column: 1 / -1; }
.src-value { animation: show-quote var(--loop) infinite; }
.doc-lines .ok { display: block; margin-top: 2px; font-family: var(--mono); font-size: 11px; color: var(--muted); animation: show-quote var(--loop) infinite; }
.doc-lines .note, .doc-lines .fix { animation: show-mark var(--loop) infinite; }
.doc-lines s { animation: strike var(--loop) infinite; }
.flag td:first-child { animation: rule-mark var(--loop) infinite; }
.doc-lines .total td { animation: show-total var(--loop) infinite; }
.slip {
  position: absolute; left: 0; right: 0; top: 0; z-index: 1;
  padding: 12px 14px; background: var(--sheet);
  border: 1px solid var(--rule-strong); border-top: 2px solid var(--ink);
  font-size: 14px; animation: show-slip var(--loop) infinite;
}
.lines { position: relative; }
.slip p { margin: 4px 0 0; color: var(--ink-2); }
.doc:hover *, .doc:hover { animation-play-state: paused; }

@keyframes step { 0%, 24% { color: var(--ink); border-top-color: var(--ink); } 25%, 100% { color: var(--muted); border-top-color: var(--rule); } }
@keyframes show-quote { 0%, 22% { opacity: 0; } 27%, 95% { opacity: 1; } 100% { opacity: 0; } }
@keyframes show-mark { 0%, 47% { opacity: 0; } 52%, 95% { opacity: 1; } 100% { opacity: 0; } }
@keyframes strike {
  0%, 47% { color: var(--ink); text-decoration-color: transparent; }
  52%, 95% { color: var(--muted); text-decoration-color: var(--red); }
  100% { color: var(--ink); text-decoration-color: transparent; }
}
@keyframes rule-mark { 0%, 47% { border-left-color: transparent; } 52%, 95% { border-left-color: var(--red); } 100% { border-left-color: transparent; } }
@keyframes show-total { 0%, 57% { opacity: 0; } 62%, 95% { opacity: 1; } 100% { opacity: 0; } }
@keyframes show-slip {
  0%, 74% { opacity: 0; transform: translateY(6px); visibility: hidden; }
  78%, 95% { opacity: 1; transform: none; visibility: visible; }
  100% { opacity: 0; visibility: hidden; }
}

/* No motion: the finished, marked-up invoice, without the step strip or the draft slip. */
@media (prefers-reduced-motion: reduce) {
  .doc *, .doc { animation: none !important; }
  .doc-steps, .slip { display: none; }
}
@media (max-width: 680px) {
  .doc-steps { font-size: 9.5px; }
}