/* ==========================================================================
   Receipt Folder — Editorial Receipt web design language
   Matches the iOS app's aesthetic: cream paper, ink type, serif display,
   signal red, monospace labels, perforation dividers. No gradients, no
   rounded pillow cards, no drop shadows.
   ========================================================================== */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
img, svg { max-width: 100%; display: block; }
button { font: inherit; background: none; border: 0; cursor: pointer; color: inherit; }
a { color: inherit; text-decoration: none; }
input, textarea, select { font: inherit; color: inherit; }

/* ---------- Tokens ---------- */
:root {
  /* Palette — identical to the iOS app */
  --paper: #F5F1E8;
  --paper-dim: #EDE7D8;
  --ink: #1A1815;
  --mute: #6E665A;
  --rule: rgba(26, 24, 21, 0.16);
  --signal: #C8392B;
  --signal-soft: #E8C9C4;
  --ember: #B57A2E;
  --ember-soft: #E8D8BD;

  /* Type */
  --serif: ui-serif, "New York", "Charter", "Iowan Old Style", Georgia, "Times New Roman", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, system-ui, sans-serif;
  --mono:  ui-monospace, "SF Mono", Menlo, "Roboto Mono", "Courier New", monospace;

  /* Spacing — 8pt grid */
  --s-1: 4px;  --s-2: 8px;  --s-3: 12px; --s-4: 16px;
  --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 64px;
  --s-9: 96px; --s-10: 128px;

  /* Layout */
  --content-max: 1200px;
  --prose-max: 680px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151210;
    --paper-dim: #1E1B18;
    --ink: #EFE8D9;
    --mute: #ACA598;
    --rule: rgba(239, 232, 217, 0.18);
    --signal: #E25A4C;
    --signal-soft: rgba(226, 90, 76, 0.18);
    --ember: #D4A05A;
    --ember-soft: rgba(212, 160, 90, 0.18);
  }
}

/* ---------- Base ---------- */
html, body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
body { min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; }

/* Utility classes */
.container { max-width: var(--content-max); margin: 0 auto; padding: 0 var(--s-5); }
.prose     { max-width: var(--prose-max); margin: 0 auto; padding: 0 var(--s-5); }
.eyebrow   { font: 600 11px/1 var(--mono); letter-spacing: 1.6px; text-transform: uppercase; color: var(--mute); }
.hairline  { height: 0.5px; background: var(--rule); border: 0; }
.rule      { height: 2px; background: var(--ink); border: 0; }
.mono      { font-family: var(--mono); }
.italic    { font-style: italic; }
.red       { color: var(--signal); }

/* Perforation divider — app's signature */
.perforation {
  --dot-size: 3px; --dot-gap: 7px;
  height: var(--dot-size);
  background-image: radial-gradient(circle, var(--rule) 40%, transparent 42%);
  background-size: calc(var(--dot-size) + var(--dot-gap)) var(--dot-size);
  background-repeat: repeat-x;
  margin: var(--s-6) 0;
}

/* Type scale */
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 400; line-height: 1.1; letter-spacing: -0.01em; }
h1 { font-size: clamp(48px, 9vw, 96px); }
h2 { font-size: clamp(32px, 5vw, 56px); }
h3 { font-size: clamp(24px, 3vw, 36px); }
h4 { font-size: 22px; }
p  { font-family: var(--serif); font-size: 17px; line-height: 1.55; color: var(--ink); }
.prose p + p { margin-top: var(--s-4); }
.prose h2, .prose h3 { margin-top: var(--s-7); margin-bottom: var(--s-3); }

/* Focus */
:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Navigation (top masthead) ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--paper);
  border-bottom: 0.5px solid var(--rule);
  backdrop-filter: saturate(1.4);
  -webkit-backdrop-filter: saturate(1.4);
}
.nav__inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--s-3) var(--s-5);
  max-width: var(--content-max); margin: 0 auto;
  gap: var(--s-5);
}
.nav__brand {
  display: flex; align-items: center; gap: var(--s-3);
  font-family: var(--serif); font-size: 22px; letter-spacing: -0.01em;
}
.nav__brand img { width: 28px; height: 28px; border-radius: 4px; }
.nav__brand em { font-style: italic; color: var(--signal); margin-left: 4px; }
.nav__links { display: flex; gap: var(--s-5); }
.nav__links a {
  font: 600 11px/1 var(--mono); letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--mute); padding: 6px 2px; position: relative; transition: color 0.15s;
}
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--ink); }
.nav__links a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -4px;
  height: 1.5px; background: var(--signal);
}
.nav__cta {
  font: 600 11px/1 var(--mono); letter-spacing: 1.4px; text-transform: uppercase;
  padding: 10px 16px; background: var(--ink); color: var(--paper);
  transition: transform 0.15s;
}
.nav__cta:hover { transform: translateY(-1px); }
.nav__toggle {
  display: none; padding: 8px; font-size: 20px;
}
@media (max-width: 720px) {
  .nav__links { display: none; }
  .nav__links--open {
    display: flex; flex-direction: column; gap: var(--s-4);
    position: absolute; inset: 100% 0 auto 0;
    background: var(--paper); border-bottom: 0.5px solid var(--rule);
    padding: var(--s-5);
  }
  .nav__toggle { display: block; }
  .nav__cta { display: none; }
}

/* ---------- Masthead (page header) ---------- */
.masthead {
  padding: var(--s-7) 0 var(--s-6);
}
.masthead__meta {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: var(--s-3);
}
.masthead__title {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px;
  font-size: clamp(56px, 10vw, 128px);
  margin-top: var(--s-4);
}
.masthead__title em { font-style: italic; color: var(--signal); }
.masthead__dek {
  font-family: var(--serif); font-style: italic; font-size: 18px;
  color: var(--mute); margin-top: var(--s-3); max-width: 640px;
}

/* ---------- Hero (landing page) ---------- */
.hero { padding: var(--s-7) 0 var(--s-9); }
.hero__grid {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: var(--s-8);
  align-items: center;
}
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: var(--s-7); }
}
.hero__copy h1 { margin-top: var(--s-3); }
.hero__lead {
  font-family: var(--serif); font-style: italic; font-size: 22px;
  color: var(--mute); margin-top: var(--s-4); max-width: 520px; line-height: 1.4;
}
.hero__ctas {
  display: flex; gap: var(--s-3); margin-top: var(--s-6); flex-wrap: wrap;
}

/* Countdown mockup */
.countdown-card {
  position: relative;
  background: var(--paper-dim);
  border: 0.75px solid var(--rule);
  padding: var(--s-7) var(--s-6);
  aspect-ratio: 9 / 16; max-width: 340px; margin: 0 auto;
  display: flex; flex-direction: column;
}
.countdown-card__head {
  display: flex; justify-content: space-between; font: 600 10px/1 var(--mono);
  letter-spacing: 1.4px; text-transform: uppercase; color: var(--mute);
}
.countdown-card__rule { height: 2px; background: var(--ink); margin: 10px 0; }
.countdown-card__name {
  font-family: var(--serif); font-size: 26px; line-height: 1.1; color: var(--ink);
}
.countdown-card__meta {
  font-family: var(--serif); font-size: 13px; font-style: italic; color: var(--mute);
  margin-top: 6px;
}
.countdown-card__days {
  flex: 1; display: flex; flex-direction: column; justify-content: center; align-items: center;
  margin: var(--s-5) 0;
}
.countdown-card__days .num {
  font-family: var(--serif); font-size: clamp(96px, 22vw, 148px); line-height: 1;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}
.countdown-card__days .unit {
  font: italic 400 20px/1 var(--serif); color: var(--signal); margin-top: 4px;
  letter-spacing: 0.05em;
}
.countdown-card__caption {
  font: italic 400 13px/1.4 var(--serif); color: var(--mute); text-align: center;
  margin-top: var(--s-3);
}
.countdown-card__footer {
  display: flex; justify-content: space-between;
  font: 600 9px/1 var(--mono); letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--mute); margin-top: auto;
  padding-top: var(--s-3); border-top: 2px solid var(--ink);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 22px;
  font: 500 14px/1 var(--sans); letter-spacing: 0.3px;
  transition: transform 0.12s, background 0.15s;
  white-space: nowrap;
}
.btn--primary   { background: var(--ink); color: var(--paper); }
.btn--primary:hover { transform: translateY(-1px); }
.btn--secondary { color: var(--ink); border: 1px solid var(--ink); }
.btn--secondary:hover { background: var(--ink); color: var(--paper); }
.btn--link {
  padding: 0; font-family: var(--serif); font-style: italic; font-size: 15px;
  text-decoration: underline; text-underline-offset: 3px;
}

/* ---------- Sections ---------- */
.section { padding: var(--s-9) 0; }
.section__head {
  display: flex; justify-content: space-between; align-items: flex-end;
  flex-wrap: wrap; gap: var(--s-4);
  margin-bottom: var(--s-7);
}
.section__title {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
}
.section__title em { font-style: italic; color: var(--signal); }
.section__kicker { font-family: var(--serif); font-style: italic; color: var(--mute); max-width: 400px; }

/* ---------- Feature grid ---------- */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0; }
@media (max-width: 900px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .features { grid-template-columns: 1fr; } }

.feature {
  padding: var(--s-6) var(--s-5);
  border-top: 0.5px solid var(--rule);
  border-right: 0.5px solid var(--rule);
  position: relative; overflow: hidden;
  transition: background 0.3s ease;
}
.feature:nth-child(3n) { border-right: 0; }
@media (max-width: 900px) {
  .feature:nth-child(3n) { border-right: 0.5px solid var(--rule); }
  .feature:nth-child(2n) { border-right: 0; }
}
@media (max-width: 560px) {
  .feature { border-right: 0 !important; }
}
.feature__num {
  font: 400 14px/1 var(--serif); font-style: italic; color: var(--signal);
  margin-bottom: var(--s-3);
}
.feature__title {
  font-family: var(--serif); font-size: 24px; line-height: 1.15; margin-bottom: var(--s-3);
}
.feature__body {
  font-size: 15px; color: var(--ink); line-height: 1.55;
}
.feature:hover { background: var(--paper-dim); }

/* ---------- Split / narrative row ---------- */
.split {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-8);
  align-items: center;
}
@media (max-width: 900px) { .split { grid-template-columns: 1fr; gap: var(--s-6); } }
.split__figure {
  background: var(--paper-dim); padding: var(--s-6);
  border: 0.5px solid var(--rule);
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 20px; color: var(--mute);
}

/* ---------- Table of ledger stats ---------- */
.ledger { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); border-bottom: 0.5px solid var(--rule); }
@media (max-width: 700px) { .ledger { grid-template-columns: repeat(2, 1fr); } }
.ledger__cell {
  padding: var(--s-6) var(--s-4);
  border-right: 0.5px solid var(--rule);
}
.ledger__cell:last-child { border-right: 0; }
@media (max-width: 700px) { .ledger__cell:nth-child(2n) { border-right: 0; } }
.ledger__num {
  font-family: var(--serif); font-size: clamp(36px, 6vw, 56px); line-height: 1;
  margin-bottom: 8px; font-variant-numeric: tabular-nums;
}
.ledger__num.red { color: var(--signal); }
.ledger__label { font: 600 10px/1.2 var(--mono); letter-spacing: 1.2px; text-transform: uppercase; color: var(--mute); }

/* ---------- FAQ accordion ---------- */
.faq { border-top: 2px solid var(--ink); }
.faq__item { border-bottom: 0.5px solid var(--rule); }
.faq__btn {
  display: flex; justify-content: space-between; align-items: center; gap: var(--s-4);
  width: 100%; padding: var(--s-5) 0; text-align: left;
  font-family: var(--serif); font-size: 20px; line-height: 1.3;
  transition: color 0.15s;
}
.faq__btn:hover { color: var(--signal); }
.faq__indicator {
  font-family: var(--mono); font-size: 20px; color: var(--mute);
  transition: transform 0.25s;
  flex-shrink: 0;
}
.faq__item[open] .faq__indicator { transform: rotate(45deg); color: var(--signal); }
.faq__answer {
  padding-bottom: var(--s-5); max-width: 620px;
  font-family: var(--serif); font-size: 16px; line-height: 1.6; color: var(--ink);
}
.faq__answer p + p { margin-top: var(--s-3); }
/* hide the default <details> marker */
summary { list-style: none; }
summary::-webkit-details-marker { display: none; }

/* ---------- Block quote ---------- */
.pullquote {
  border-left: 2px solid var(--ink);
  padding: 4px 0 4px var(--s-5);
  font-family: var(--serif); font-style: italic; font-size: 22px;
  line-height: 1.4; color: var(--ink);
  max-width: 680px; margin: var(--s-7) 0;
}
.pullquote cite {
  display: block; font-family: var(--mono); font-style: normal; font-size: 11px;
  letter-spacing: 1.4px; text-transform: uppercase; color: var(--mute); margin-top: var(--s-3);
}

/* ---------- Contact form ---------- */
.form { display: flex; flex-direction: column; gap: var(--s-5); max-width: 560px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label {
  font: 600 10px/1 var(--mono); letter-spacing: 1.4px; text-transform: uppercase; color: var(--mute);
}
.field input, .field textarea, .field select {
  font-family: var(--serif); font-size: 17px;
  background: transparent; color: var(--ink);
  border: 0; border-bottom: 1px solid var(--ink);
  padding: 8px 0;
  transition: border-color 0.15s;
}
.field textarea { min-height: 120px; resize: vertical; font-style: italic; }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: none; border-color: var(--signal);
}
.form__actions { display: flex; gap: var(--s-4); align-items: center; }

/* ---------- Footer ---------- */
.footer {
  background: var(--paper-dim);
  border-top: 2px solid var(--ink);
  padding: var(--s-8) 0 var(--s-6);
  margin-top: var(--s-10);
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--s-6);
  max-width: var(--content-max); margin: 0 auto; padding: 0 var(--s-5);
}
@media (max-width: 760px) { .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--s-5); } }
@media (max-width: 420px) { .footer__grid { grid-template-columns: 1fr; } }
.footer__col h4 {
  font: 600 10px/1 var(--mono); letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--mute); margin-bottom: var(--s-3);
}
.footer__col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer__col a {
  font-family: var(--serif); font-size: 16px; color: var(--ink);
  transition: color 0.12s;
}
.footer__col a:hover { color: var(--signal); text-decoration: underline; text-underline-offset: 3px; }
.footer__brand { font-family: var(--serif); font-size: 28px; line-height: 1.1; }
.footer__brand em { font-style: italic; color: var(--signal); }
.footer__tag {
  font-family: var(--serif); font-style: italic; font-size: 14px; color: var(--mute);
  margin-top: var(--s-3); max-width: 300px;
}
.footer__end {
  display: flex; justify-content: space-between; align-items: center;
  max-width: var(--content-max); margin: var(--s-7) auto 0; padding: var(--s-4) var(--s-5) 0;
  border-top: 0.5px solid var(--rule);
  font: 400 11px/1 var(--mono); letter-spacing: 1px; color: var(--mute);
}
@media (max-width: 520px) { .footer__end { flex-direction: column; gap: var(--s-3); align-items: flex-start; } }

/* ---------- Reveal-on-scroll animation ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.7s ease, transform 0.7s ease; }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* ---------- Hidden helper ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ---------- App Store badge placeholder ---------- */
.app-store {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 18px; background: var(--ink); color: var(--paper);
  transition: transform 0.15s;
}
.app-store:hover { transform: translateY(-1px); }
.app-store__svg { width: 22px; height: 22px; }
.app-store__text { display: flex; flex-direction: column; line-height: 1.1; }
.app-store__text small { font-size: 10px; opacity: 0.7; letter-spacing: 0.3px; }
.app-store__text strong { font-size: 16px; font-weight: 500; letter-spacing: 0.3px; }