/* ==========================================================================
   COMPONENTS & INTERACTION LANGUAGE
   Depends on tokens.css. No framework, no reset library, no utility classes.
   ========================================================================== */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: var(--size-body);
  line-height: var(--leading-body);
  font-weight: var(--weight-regular);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 { margin: 0; font-weight: var(--weight-strong); line-height: var(--leading-tight); }
p { margin: 0; }
button, input, select { font: inherit; color: inherit; }

/* Focus: one visible, high-contrast treatment everywhere. Never removed. */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

::selection { background: var(--signal-wash); color: var(--ink); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute; left: var(--space-snug); top: -3rem;
  background: var(--ink); color: var(--paper);
  padding: var(--space-snug) var(--space-base);
  text-decoration: none; z-index: 100;
  transition: top var(--dur-quick) var(--ease);
}
.skip-link:focus-visible { top: var(--space-snug); }

/* --- Machine facts -------------------------------------------------------
   Any value the customer may need to read back, quote or verify. */
.fact {
  font-family: var(--font-fact);
  font-size: calc(1em * var(--fact-optical-scale));
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.label {
  font-size: var(--size-micro);
  font-weight: var(--weight-medium);
  letter-spacing: var(--track-label);
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ==========================================================================
   Page frame
   ========================================================================== */

.masthead {
  border-bottom: var(--hair) solid var(--rule);
  background: var(--paper);
}
.masthead__inner {
  max-width: 62rem; margin: 0 auto;
  padding: var(--space-cosy) var(--space-base);
  display: flex; align-items: center; justify-content: space-between; gap: var(--space-base);
}
/* Brand slot: intentionally a neutral container. The final wordmark drops in
   here without touching any other rule. */
.brand {
  display: inline-flex; align-items: baseline; gap: var(--space-tight);
  font-weight: var(--weight-strong); letter-spacing: var(--track-display);
  color: var(--ink); text-decoration: none; font-size: var(--size-title);
}
.brand__mark {
  inline-size: 1.125rem; block-size: 1.125rem;
  border: 2px solid var(--ink); border-radius: var(--radius-sm);
  align-self: center;
}
.masthead__note { font-size: var(--size-support); color: var(--ink-muted); }

.page { max-width: 62rem; margin: 0 auto; padding: var(--space-wide) var(--space-base) var(--space-page); }

@media (min-width: 56rem) {
  .page {
    display: grid;
    grid-template-columns: var(--column) minmax(0, 1fr);
    gap: var(--space-page);
    align-items: start;
    padding-top: var(--space-vast);
  }
}

/* ==========================================================================
   The transaction — the dominant object on the page
   ========================================================================== */

.txn {
  background: var(--paper-raised);
  border: var(--hair) solid var(--rule-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.txn__head {
  padding: var(--space-base) var(--space-base) var(--space-cosy);
  border-bottom: var(--hair) solid var(--rule);
}
.txn__title {
  font-size: var(--size-display);
  letter-spacing: var(--track-display);
  line-height: var(--leading-tight);
}
.txn__sub {
  margin-top: var(--space-tight);
  font-size: var(--size-support);
  color: var(--ink-muted);
}

/* Progress: a ruled meter, not a stepper with circles. Honest about position
   without pretending the steps are navigable. */
.meter { display: flex; gap: var(--space-hair); padding: 0 var(--space-base) var(--space-base); }
.meter__seg {
  flex: 1; height: 3px; background: var(--rule); border-radius: 1px;
  transition: background var(--dur-calm) var(--ease);
}
.meter__seg[data-on="true"] { background: var(--signal); }
.meter__seg[data-state="good"] { background: var(--state-good); }
.meter__seg[data-state="stop"] { background: var(--state-stop); }

.txn__body { padding: var(--space-base); display: grid; gap: var(--space-base); }

/* --- Field ---------------------------------------------------------------- */
.field { display: grid; gap: var(--space-snug); }
.field__label { font-size: var(--size-support); font-weight: var(--weight-medium); color: var(--ink); }
.field__hint { font-size: var(--size-support); color: var(--ink-muted); }

.input {
  inline-size: 100%;
  min-height: var(--tap);
  padding: var(--space-cosy);
  background: var(--paper);
  border: var(--hair) solid var(--rule-strong);
  border-radius: var(--radius-md);
  font-family: var(--font-fact);
  font-size: 1.0625rem;               /* ≥16px prevents iOS zoom-on-focus */
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  transition: border-color var(--dur-quick) var(--ease), background var(--dur-quick) var(--ease);
}
.input::placeholder { color: var(--ink-faint); letter-spacing: 0.04em; }
.input:hover { border-color: var(--ink-faint); }
.input:focus-visible { border-color: var(--signal); background: var(--paper-raised); outline-offset: 1px; }
.input[aria-invalid="true"] { border-color: var(--state-stop); }
.input:disabled { background: var(--paper-sunk); color: var(--ink-faint); cursor: not-allowed; }

.field__error {
  display: flex; gap: var(--space-snug); align-items: flex-start;
  font-size: var(--size-support); color: var(--state-stop);
}
.field__ok { font-size: var(--size-support); color: var(--ink-muted); }

/* --- Dropzone ------------------------------------------------------------- */
.drop {
  position: relative;
  display: grid; gap: var(--space-cosy);
  place-items: center; text-align: center;
  padding: var(--space-wide) var(--space-base);
  background: var(--paper);
  border: 1.5px dashed var(--rule-strong);
  border-radius: var(--radius-md);
  transition: border-color var(--dur-quick) var(--ease), background var(--dur-quick) var(--ease);
}
.drop:hover, .drop:focus-within { border-color: var(--signal); background: var(--signal-wash); }
.drop[data-dragging="true"] { border-color: var(--signal); background: var(--signal-wash); border-style: solid; }
.drop__primary { font-weight: var(--weight-medium); }
.drop__formats { font-size: var(--size-micro); color: var(--ink-faint); font-family: var(--font-fact); }
.drop input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
}
.drop__actions { display: flex; gap: var(--space-snug); flex-wrap: wrap; justify-content: center; }

/* --- Document proxy ------------------------------------------------------
   The uploaded document rendered as an actual page, stacked to show count.
   This is what makes the document — not our branding — the visual subject. */
.doc { display: flex; gap: var(--space-base); align-items: flex-start; }
.doc__stack { position: relative; flex: none; inline-size: 68px; }
.doc__page {
  aspect-ratio: 8.5 / 11;
  background: var(--paper-raised);
  border: var(--hair) solid var(--rule-strong);
  border-radius: var(--radius-sm);
  position: relative; z-index: 2;
  display: grid; place-items: center;
  overflow: hidden;
}
/* Ruled lines standing in for document content — abstract, never fake text. */
.doc__page::after {
  content: ""; position: absolute; inset: 12% 14%;
  background: repeating-linear-gradient(
    to bottom, var(--rule) 0 1px, transparent 1px 7px
  );
  opacity: 0.9;
}
.doc__shadowpage {
  position: absolute; inset: 0; z-index: 1;
  aspect-ratio: 8.5 / 11;
  background: var(--paper-sunk);
  border: var(--hair) solid var(--rule);
  border-radius: var(--radius-sm);
  transform: translate(4px, 4px);
}
.doc__meta { display: grid; gap: var(--space-tight); min-inline-size: 0; }
.doc__name {
  font-weight: var(--weight-medium);
  overflow-wrap: anywhere;
}
.doc__stats { font-size: var(--size-support); color: var(--ink-muted); }
.doc__replace {
  justify-self: start; margin-top: var(--space-tight);
}

/* Rendering shimmer — a page being converted. Structural, not decorative. */
.doc__page[data-rendering="true"]::before {
  content: ""; position: absolute; inset: 0; z-index: 3;
  background: linear-gradient(180deg, transparent, var(--signal-wash), transparent);
  animation: scan 1.1s var(--ease) infinite;
}
@keyframes scan { from { transform: translateY(-100%); } to { transform: translateY(100%); } }
@media (prefers-reduced-motion: reduce) {
  .doc__page[data-rendering="true"]::before { animation: none; opacity: 0.5; }
}

/* ==========================================================================
   Price
   ========================================================================== */

.price {
  border: var(--hair) solid var(--rule-strong);
  border-radius: var(--radius-md);
  background: var(--paper);
  overflow: hidden;
}
.price__row {
  display: flex; align-items: baseline; justify-content: space-between; gap: var(--space-base);
  padding: var(--space-cosy) var(--space-base);
}
.price__row + .price__row { border-top: var(--hair) solid var(--rule); }
.price__row--total { background: var(--paper-raised); }
.price__desc { font-size: var(--size-support); color: var(--ink-muted); }
.price__amount { font-family: var(--font-fact); font-variant-numeric: tabular-nums; }
.price__total {
  font-family: var(--font-fact);
  font-size: var(--size-display);
  font-weight: var(--weight-strong);
  letter-spacing: var(--track-display);
  font-variant-numeric: tabular-nums;
}
.price__label { font-weight: var(--weight-medium); }

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--space-snug);
  min-height: var(--tap); padding: 0 var(--space-base);
  border-radius: var(--radius-md); border: var(--hair) solid transparent;
  font-size: var(--size-body); font-weight: var(--weight-medium);
  cursor: pointer; text-decoration: none;
  transition: background var(--dur-instant) var(--ease), border-color var(--dur-instant) var(--ease);
}
.btn--primary { background: var(--ink); color: var(--paper); inline-size: 100%; }
.btn--primary:hover:not(:disabled) { background: #000; }
.btn--primary:disabled { background: var(--rule-strong); color: var(--paper); cursor: not-allowed; }
.btn--secondary { background: var(--paper-raised); color: var(--ink); border-color: var(--rule-strong); }
.btn--secondary:hover { border-color: var(--ink-faint); }
.btn--quiet {
  background: none; border-color: transparent; color: var(--signal);
  padding: 0; min-height: auto; text-decoration: underline; text-underline-offset: 3px;
}
.btn--small { min-height: 36px; font-size: var(--size-support); }

.pay {
  display: grid; gap: var(--space-snug);
  padding-top: var(--space-tight);
}
.pay__promise {
  display: flex; gap: var(--space-snug); align-items: flex-start;
  padding: var(--space-cosy);
  background: var(--state-held-wash);
  border: var(--hair) solid color-mix(in srgb, var(--state-held) 28%, transparent);
  border-radius: var(--radius-md);
  font-size: var(--size-support); color: var(--ink);
}
.pay__legal { font-size: var(--size-micro); color: var(--ink-faint); text-align: center; }

/* ==========================================================================
   Transaction states
   ========================================================================== */

.state { display: grid; gap: var(--space-base); padding: var(--space-roomy) var(--space-base); text-align: left; }
.state__banner {
  display: flex; gap: var(--space-cosy); align-items: flex-start;
  padding: var(--space-base);
  border-radius: var(--radius-md);
  border: var(--hair) solid transparent;
}
.state__banner--sending { background: var(--signal-wash); border-color: color-mix(in srgb, var(--signal) 24%, transparent); }
.state__banner--good { background: var(--state-good-wash); border-color: color-mix(in srgb, var(--state-good) 30%, transparent); }
.state__banner--stop { background: var(--state-stop-wash); border-color: color-mix(in srgb, var(--state-stop) 30%, transparent); }
.state__headline { font-size: var(--size-title); font-weight: var(--weight-strong); line-height: var(--leading-snug); }
.state__detail { margin-top: var(--space-tight); font-size: var(--size-support); color: var(--ink-muted); }

/* Live indicator: three bars, phase-shifted. Represents work actually in
   progress, so it is the one element permitted to animate indefinitely. */
.pulse { display: inline-flex; gap: 3px; align-items: flex-end; height: 1em; flex: none; margin-top: 0.15em; }
.pulse span {
  inline-size: 3px; block-size: 100%; background: var(--signal); border-radius: 1px;
  animation: pulse 1s var(--ease) infinite;
}
.pulse span:nth-child(2) { animation-delay: 0.12s; }
.pulse span:nth-child(3) { animation-delay: 0.24s; }
@keyframes pulse { 0%, 100% { transform: scaleY(0.4); } 50% { transform: scaleY(1); } }
@media (prefers-reduced-motion: reduce) { .pulse span { animation: none; transform: scaleY(0.7); } }

.dot { inline-size: 8px; block-size: 8px; border-radius: 50%; flex: none; margin-top: 0.45em; }
.dot--good { background: var(--state-good); }
.dot--stop { background: var(--state-stop); }

/* Attempt log — shows the work we did on the customer's behalf. */
.attempts { border-top: var(--hair) solid var(--rule); }
.attempt {
  display: grid; grid-template-columns: auto 1fr auto; gap: var(--space-cosy);
  align-items: baseline;
  padding: var(--space-cosy) 0;
  border-bottom: var(--hair) solid var(--rule);
  font-size: var(--size-support);
}
.attempt__n { font-family: var(--font-fact); color: var(--ink-faint); }
.attempt__what { color: var(--ink-muted); }
.attempt__result { font-family: var(--font-fact); font-size: var(--size-micro); }
.attempt__result[data-ok="false"] { color: var(--state-stop); }
.attempt__result[data-ok="true"] { color: var(--state-good); }

/* ==========================================================================
   Receipt — designed to be printed and filed
   ========================================================================== */

.receipt {
  background: var(--paper-raised);
  border: var(--hair) solid var(--rule-strong);
  border-radius: var(--radius-md);
}
.receipt__head {
  padding: var(--space-base);
  border-bottom: 2px solid var(--ink);
}
.receipt__kicker { margin-bottom: var(--space-tight); }
.receipt__title { font-size: var(--size-title); }
.receipt__summary { margin-top: var(--space-snug); font-size: var(--size-support); color: var(--ink-muted); max-width: var(--measure); }

.record { border-collapse: collapse; inline-size: 100%; }
.record caption { text-align: left; padding: var(--space-base) var(--space-base) var(--space-snug); }
.record th, .record td {
  text-align: left; vertical-align: top;
  padding: var(--space-snug) var(--space-base);
  border-bottom: var(--hair) solid var(--rule);
  font-size: var(--size-support);
}
.record th { font-weight: var(--weight-regular); color: var(--ink-muted); inline-size: 42%; }
.record td { font-family: var(--font-fact); font-variant-numeric: tabular-nums; overflow-wrap: anywhere; }
.record tr:last-child th, .record tr:last-child td { border-bottom: 0; }

/* What each artifact proves — and does not. Never collapsed away. */
.claims { border-top: var(--hair) solid var(--rule); padding: var(--space-base); display: grid; gap: var(--space-base); }
.claim { display: grid; gap: var(--space-tight); }
.claim__artifact { font-size: var(--size-support); font-weight: var(--weight-medium); }
.claim__proves { font-size: var(--size-support); color: var(--ink-muted); }
.claim__limit {
  font-size: var(--size-support); color: var(--ink-muted);
  padding-left: var(--space-cosy); border-left: 2px solid var(--rule-strong);
}

/* ==========================================================================
   Supporting column
   ========================================================================== */

.aside { display: grid; gap: var(--space-roomy); align-content: start; margin-top: var(--space-wide); }
@media (min-width: 56rem) { .aside { margin-top: 0; } }

.assurances { display: grid; gap: var(--space-base); list-style: none; margin: 0; padding: 0; }
.assurance { display: grid; gap: var(--space-tight); padding-left: var(--space-base); border-left: 2px solid var(--rule-strong); }
.assurance__head { font-weight: var(--weight-medium); font-size: var(--size-support); }
.assurance__body { font-size: var(--size-support); color: var(--ink-muted); max-width: var(--measure); }

.prose { max-width: var(--measure); display: grid; gap: var(--space-cosy); }
.prose h2 { font-size: var(--size-title); }
.prose p { font-size: var(--size-support); color: var(--ink-muted); }

.foot {
  border-top: var(--hair) solid var(--rule);
  margin-top: var(--space-page);
  padding: var(--space-roomy) var(--space-base);
}
.foot__inner {
  max-width: 62rem; margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: var(--space-base) var(--space-roomy);
  justify-content: space-between; align-items: baseline;
  font-size: var(--size-support);
}
.foot a { color: var(--ink-muted); text-decoration: none; }
.foot a:hover { color: var(--ink); text-decoration: underline; text-underline-offset: 3px; }
.foot__links { display: flex; flex-wrap: wrap; gap: var(--space-base); }

/* ==========================================================================
   Mobile: sticky commit bar
   The action must always be reachable with a thumb while the document and price
   stay visible above it.
   ========================================================================== */
@media (max-width: 55.99rem) {
  .commit {
    position: sticky; bottom: 0; z-index: 10;
    background: var(--paper-raised);
    border-top: var(--hair) solid var(--rule);
    box-shadow: var(--lift);
    padding: var(--space-cosy) var(--space-base)
             calc(var(--space-cosy) + env(safe-area-inset-bottom, 0px));
    display: grid; gap: var(--space-snug);
  }
}

@media print {
  .masthead, .foot, .aside, .btn, .commit { display: none !important; }
  body { background: #fff; color: #000; }
  .receipt { border: 1px solid #000; break-inside: avoid; }
  .claim__limit { border-left-color: #000; }
}

/*
 * Was an inline `style` attribute. A Content-Security-Policy strict enough to
 * be worth having forbids those, and the browser said so out loud — which is
 * the correct outcome: one exception for a margin would have opened
 * `style-src` for every injected attribute too.
 */
.label--spaced { margin-bottom: var(--space-cosy); }

/*
 * `hidden` must actually hide.
 *
 * The attribute's UA rule is `display: none`, and ANY author rule that sets a
 * display — `.doc { display: flex }` — beats it on specificity. The mockup
 * looked correct because every state was mounted on purpose; the moment a
 * script started toggling `hidden`, all of them stayed on screen at once.
 *
 * Found in a browser, not in a test: the markup was valid, the script ran, and
 * the accessibility tree showed every state simultaneously.
 */
[hidden] { display: none !important; }