/* ShopSaver — editorial receipt.
   One idea, executed throughout: the page reads like a well-set ledger, and the
   hero is a till receipt that prints itself. Serif for voice, mono for figures. */

:root {
  --paper: #f4f0e6;
  --paper-2: #ebe5d7;
  --slip: #fcfaf5;          /* the receipt itself, a shade brighter than the page */
  --ink: #1a1916;
  --ink-2: #57534b;         /* 6.9:1 on --paper */
  --ink-3: #6f6a60;         /* 4.9:1 on --paper; small print only */
  --rule: #d3cbb9;
  --accent: #9e2f1c;        /* stamp red, used sparingly; 6.4:1 on --paper */
  --accent-ink: #fcfaf5;
  --shadow: 0 1px 0 rgb(0 0 0 / 0.04), 0 18px 40px -18px rgb(60 40 10 / 0.35);
  --focus: #1f5fbf;

  --serif: "Instrument Serif", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --gutter: 16px;
  --max: 72rem;
  --radius: 3px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151412;
    --paper-2: #1c1b18;
    --slip: #22211d;
    --ink: #ede7da;
    --ink-2: #b1aa9c;
    --ink-3: #958e80;
    --rule: #38352f;
    --accent: #e5806a;
    --accent-ink: #151412;
    --shadow: 0 1px 0 rgb(255 255 255 / 0.03), 0 24px 48px -20px rgb(0 0 0 / 0.7);
    --focus: #8ab4ff;
    color-scheme: dark;
  }
}

/* ── Base ─────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 4.5rem; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
h1, h2, h3, p, ol, ul, dl, dd, figure { margin: 0; }
ol, ul { padding: 0; list-style: none; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
code, pre { font-family: var(--mono); font-size: 0.875em; }
abbr[title] { text-decoration: none; }
strong { font-weight: 600; }
::selection { background: var(--accent); color: var(--accent-ink); }

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

.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.skip {
  position: absolute; left: var(--gutter); top: -3rem; z-index: 20;
  background: var(--ink); color: var(--paper); padding: 0.5rem 0.9rem; border-radius: var(--radius);
}
.skip:focus { top: 0.75rem; }

/* ── Masthead ─────────────────────────────────────────── */
.masthead {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.masthead__inner { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.5rem; }
.wordmark { font: 400 1.5rem/1 var(--serif); text-decoration: none; letter-spacing: -0.01em; }
.masthead__nav { display: flex; align-items: center; gap: 1.25rem; font: 500 0.8125rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.06em; }
.masthead__nav a { text-decoration: none; color: var(--ink-2); }
.masthead__nav a:hover { color: var(--ink); }
.masthead__nav li:not(:last-child) { display: none; }
.masthead__cta { color: var(--accent) !important; }

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  min-height: 2.875rem; padding: 0 1.25rem;
  font: 500 0.9375rem/1 var(--sans); text-decoration: none;
  border-radius: var(--radius); border: 1px solid transparent;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--accent); color: var(--accent-ink); }
.btn--primary span { transition: transform 160ms ease; }
.btn--primary:hover span { transform: translateX(3px); }
.btn--quiet { border-color: var(--rule); color: var(--ink); }
.btn--quiet:hover { border-color: var(--ink-2); }

/* ── Hero ─────────────────────────────────────────────── */
.hero { padding-block: 3rem 4rem; }
.hero__grid { display: grid; gap: 3rem; align-items: center; }
.eyebrow {
  font: 500 0.75rem/1.4 var(--mono); text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink-2); margin-bottom: 1.25rem;
}
.hero__title {
  font: 400 clamp(4.25rem, 19vw, 9.75rem)/0.86 var(--serif);
  letter-spacing: -0.035em;
}
/* the eyebrow sits inside the h1 so the heading carries words, not just the name */
.hero__title .eyebrow { display: block; }
.hero__word { display: block; margin-left: -0.04em; }
.hero__title em { font-style: italic; color: var(--accent); letter-spacing: -0.02em; }
/* a rubber stamp beside the wordmark: pressed on once, slightly askew */
.hero__word { position: relative; width: fit-content; }
.stamp {
  position: absolute; left: 100%; top: 0.35em; margin-left: 0.4em; padding: 0.3em 0.55em 0.25em;
  font: 500 clamp(0.7rem, 2.4vw, 0.95rem)/1 var(--mono); letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); border: 1.5px solid currentColor; border-radius: 3px;
  white-space: nowrap; transform: rotate(-8deg); opacity: 0.9;
  animation: stamp 420ms cubic-bezier(.2,.9,.3,1.3) 900ms both;
}
@keyframes stamp {
  from { opacity: 0; transform: rotate(-8deg) scale(1.8); }
  to   { opacity: 0.9; transform: rotate(-8deg) scale(1); }
}
.hero__lede {
  margin-top: 1.5rem; max-width: 30ch;
  font: 400 clamp(1.375rem, 4.6vw, 1.875rem)/1.28 var(--serif);
  color: var(--ink);
}
.hero__actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }
.hero__facts {
  display: flex; flex-wrap: wrap; gap: 0.25rem 0; margin-top: 2rem;
  font: 400 0.75rem/1.6 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--ink-2);
}
.hero__facts li:not(:last-child)::after { content: "·"; margin-inline: 0.65rem; color: var(--ink-3); }

/* ── The receipt ──────────────────────────────────────── */
.receipt-stage { display: grid; justify-items: center; gap: 1rem; }
.receipt {
  --w: min(100%, 22.5rem);
  width: var(--w);
  position: relative;
  filter: drop-shadow(0 18px 24px rgb(40 25 5 / 0.14));
  transform: rotate(-1.2deg);
}
@media (prefers-color-scheme: dark) { .receipt { filter: drop-shadow(0 22px 30px rgb(0 0 0 / 0.55)); } }

.receipt__paper {
  background: var(--slip);
  padding: 1.5rem 1.25rem 1.75rem;
  font: 400 0.75rem/1.65 var(--mono);
  color: var(--ink);
  /* torn zig-zag bottom edge */
  --z: 7px;
  -webkit-mask:
    conic-gradient(from -45deg at bottom, #0000, #000 1deg 89deg, #0000 90deg) 50% / calc(2 * var(--z)) 100%;
  mask:
    conic-gradient(from -45deg at bottom, #0000, #000 1deg 89deg, #0000 90deg) 50% / calc(2 * var(--z)) 100%;
  padding-bottom: calc(1.75rem + var(--z));
  /* prints top-down, one line at a time */
  animation: print 2.6s steps(26, end) 0.35s both;
}
@keyframes print {
  from { clip-path: inset(0 0 100% 0); }
  to   { clip-path: inset(0 0 0 0); }
}
.receipt__paper > p { min-height: 1.65em; }
.r-center { text-align: center; }
.r-strong { font-weight: 500; }
.receipt__paper > .r-center.r-strong:first-child { letter-spacing: 0.32em; font-size: 0.875rem; }
.r-muted, .r-note { color: var(--ink-2); }
.r-rule { border-top: 1px dashed var(--ink-3); margin-block: 0.6rem; min-height: 0 !important; }
.r-rule--double { border-top-style: double; border-top-width: 3px; }
.r-ask { font: italic 400 1.0625rem/1.35 var(--serif); padding-block: 0.2rem; }
.r-row { display: grid; grid-template-columns: 1fr 3.4em 3.4em; gap: 0.5rem; }
.r-row > span:not(:first-child) { text-align: right; font-variant-numeric: tabular-nums; }
.r-row > span:first-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.r-head { color: var(--ink-2); font-size: 0.6875rem; letter-spacing: 0.08em; }
.r-void > span:first-child { text-decoration: line-through; text-decoration-color: var(--accent); }
.r-note { padding-left: 0.5rem; font-size: 0.6875rem; }
.r-total { font-weight: 500; }
.r-kv { display: flex; justify-content: space-between; gap: 1rem; }
.r-kv.r-strong > span:last-child { color: var(--accent); }
.r-reply { margin-top: 0.75rem; font: 400 0.9375rem/1.45 var(--sans); }
.caret {
  display: inline-block; width: 0.5em; height: 1.05em; margin-left: 0.2em;
  vertical-align: -0.15em; background: var(--accent);
  animation: blink 1.1s steps(1, end) 3.2s infinite;
}
@keyframes blink { 50% { opacity: 0; } }
.receipt-caption { font: 400 0.75rem/1.4 var(--mono); color: var(--ink-3); letter-spacing: 0.04em; }

/* ── Sections ─────────────────────────────────────────── */
.section { padding-block: 4.5rem; border-top: 1px solid var(--rule); }
.section--inset { background: var(--paper-2); }
.sec-head {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.9rem 1rem;
  margin-bottom: 2.25rem;
}
.sec-no { order: 0; font: 500 0.75rem/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); white-space: nowrap; }
.sec-head::after {
  /* dot leader to the edge, like a ledger heading */
  content: ""; order: 1; flex: 1; min-width: 2rem; align-self: center;
  border-bottom: 1px dotted var(--ink-3);
}
.sec-head h2 { order: 2; flex-basis: 100%; font: 400 clamp(2.125rem, 7vw, 3.5rem)/1.02 var(--serif); letter-spacing: -0.02em; }

/* What it is */
.what { display: grid; gap: 2.5rem; }
.what__statement { font: 400 clamp(1.375rem, 4vw, 1.75rem)/1.35 var(--serif); max-width: 34ch; }
.steps { display: grid; gap: 1.25rem; counter-reset: s; }
.steps li { display: grid; grid-template-columns: 2.25rem 1fr; gap: 0.75rem; align-items: baseline; padding-top: 1.25rem; border-top: 1px solid var(--rule); }
.steps__no { font: italic 400 1.75rem/1 var(--serif); color: var(--accent); }
.steps p { color: var(--ink-2); }
.steps strong { color: var(--ink); font-weight: 600; }

/* Four tools as a ledger */
.ledger { border-top: 1px solid var(--ink); }
.ledger__row {
  display: grid; grid-template-columns: 2.25rem 1fr; gap: 0.5rem 0.75rem;
  padding-block: 1.75rem; border-bottom: 1px solid var(--rule);
}
.ledger__no { font: italic 400 1.25rem/1.5 var(--serif); color: var(--ink-3); }
.ledger__q { font: italic 400 clamp(1.5rem, 5vw, 2.125rem)/1.15 var(--serif); letter-spacing: -0.01em; }
.ledger__a { margin-top: 0.6rem; color: var(--ink-2); max-width: 56ch; }
.ledger__tool {
  grid-column: 2; justify-self: start;
  font-size: 0.75rem; letter-spacing: 0.02em; color: var(--ink-2);
  padding: 0.2rem 0.5rem; border: 1px solid var(--rule); border-radius: var(--radius);
}

/* Principles */
.principles__intro { font: 400 clamp(1.25rem, 3.6vw, 1.5rem)/1.4 var(--serif); max-width: 40ch; margin-bottom: 2.5rem; color: var(--ink-2); }
.principles { display: grid; gap: 0; counter-reset: p; }
.principle { padding-block: 1.5rem; border-top: 1px solid var(--rule); counter-increment: p; }
.principle dt {
  font: 400 clamp(1.5rem, 4.8vw, 2rem)/1.15 var(--serif); letter-spacing: -0.01em;
  display: flex; gap: 0.75rem; align-items: baseline;
}
.principle dt::before {
  content: "§" counter(p); font: 500 0.75rem/1 var(--mono); color: var(--accent);
  letter-spacing: 0.04em; flex: none; transform: translateY(-0.35em);
}
.principle dd { margin-top: 0.6rem; color: var(--ink-2); max-width: 52ch; }

/* Connect */
.connect { display: grid; grid-template-columns: minmax(0, 1fr); gap: 1.75rem; }
.connect > * { min-width: 0; }
.urlbar {
  display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 0.5rem 1rem;
  padding: 1rem 1rem 1rem 1.25rem; background: var(--slip); border: 1px solid var(--rule);
  border-radius: var(--radius); box-shadow: var(--shadow);
}
.urlbar__label { grid-column: 1 / -1; font: 500 0.6875rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-2); }
.urlbar__value { font-size: clamp(0.875rem, 3.4vw, 1.0625rem); overflow-wrap: anywhere; color: var(--ink); }

.copy {
  font: 500 0.75rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em;
  min-height: 2.5rem; min-width: 5.5rem; padding: 0 0.9rem;
  color: var(--ink); background: transparent; border: 1px solid var(--ink-3); border-radius: var(--radius);
  cursor: pointer; transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}
.copy:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.copy.is-done { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.tabs__list {
  display: flex; gap: 0.25rem; overflow-x: auto; scrollbar-width: none;
  padding: 0.25rem; margin-inline: calc(-1 * var(--gutter)); padding-inline: var(--gutter);
  border-bottom: 1px solid var(--rule);
  -webkit-overflow-scrolling: touch;
}
.tabs__list::-webkit-scrollbar { display: none; }
.tabs__list [role="tab"] {
  flex: none; position: relative;
  font: 500 0.9375rem/1 var(--sans); color: var(--ink-2);
  background: none; border: 0; padding: 0.9rem 0.85rem 1rem; cursor: pointer;
}
.tabs__list [role="tab"]::after {
  content: ""; position: absolute; left: 0.85rem; right: 0.85rem; bottom: -1px; height: 2px;
  background: var(--accent); transform: scaleX(0); transform-origin: left; transition: transform 220ms ease;
}
.tabs__list [role="tab"]:hover { color: var(--ink); }
.tabs__list [role="tab"][aria-selected="true"] { color: var(--ink); }
.tabs__list [role="tab"][aria-selected="true"]::after { transform: scaleX(1); }
.tabs__list [role="tab"]:focus-visible { outline-offset: -2px; }

.tabs__panel { padding-top: 1.75rem; max-width: 46rem; }
.tabs__panel:focus-visible { outline-offset: 6px; }
.panel__lead { font: italic 400 1.375rem/1.3 var(--serif); margin-bottom: 1.25rem; }
.howto { counter-reset: h; display: grid; gap: 0.85rem; }
.howto li { counter-increment: h; position: relative; padding-left: 2rem; }
.howto li::before { content: counter(h, decimal-leading-zero); position: absolute; left: 0; top: 0.45em; font: 500 0.75rem/1 var(--mono); color: var(--accent); }
.howto code, .panel__lead code, .note code { overflow-wrap: anywhere; background: var(--paper-2); padding: 0.1em 0.35em; border-radius: 2px; }
.note { margin-top: 1.25rem; font-size: 0.875rem; color: var(--ink-2); }
.feedback { scroll-margin-top: 6rem; padding-top: 1.25rem; border-top: 1px dashed var(--rule, currentColor); font-size: 0.9375rem; color: var(--ink-2); }
.feedback a { color: var(--accent); text-underline-offset: 0.2em; }
.feedback__tag {
  display: inline-block; margin-right: 0.5em; padding: 0.2em 0.45em 0.15em;
  font: 500 0.6875rem/1 var(--mono); letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); border: 1px solid currentColor; border-radius: 2px; transform: rotate(-4deg);
}
.directory { margin-top: 1rem; }
.directory a { color: var(--accent); font-weight: 500; }

.snippet {
  position: relative; background: var(--slip); border: 1px solid var(--rule); border-radius: var(--radius);
}
.snippet pre {
  margin: 0; padding: 1.25rem 1.25rem 4rem; overflow-x: auto; line-height: 1.6;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.snippet .copy { position: absolute; right: 0.75rem; bottom: 0.75rem; background: var(--slip); }
.snippet .copy:hover { background: var(--ink); }
.snippet .copy.is-done { background: var(--accent); }

/* Questions, set like the ledger */
.faq { border-top: 1px solid var(--ink); counter-reset: q; }
.faq__item {
  display: grid; grid-template-columns: 2.25rem 1fr; gap: 0.5rem 0.75rem; align-items: baseline;
  padding-block: 1.5rem; border-bottom: 1px solid var(--rule); counter-increment: q;
}
.faq__item::before { content: "Q" counter(q); font: 500 0.75rem/1 var(--mono); color: var(--accent); letter-spacing: 0.04em; }
.faq__item dt { font: 400 clamp(1.375rem, 4vw, 1.75rem)/1.2 var(--serif); letter-spacing: -0.01em; }
.faq__item dd { grid-column: 2; color: var(--ink-2); max-width: 56ch; }

/* ── Footer ───────────────────────────────────────────── */
.footer { border-top: 1px solid var(--ink); padding-block: 2.5rem 3rem; }
.footer__inner { display: grid; gap: 1rem; }
.footer__mark { font: italic 400 2rem/1 var(--serif); }
.footer__small { font-size: 0.8125rem; color: var(--ink-2); max-width: 52ch; }
.footer__links { display: flex; gap: 1.25rem; font: 500 0.75rem/1 var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
.footer__links a { color: var(--ink-2); }
.footer__links a:hover { color: var(--ink); }

/* ── Plain pages (privacy, 404) ───────────────────────── */
.page { padding-block: 3.5rem 5rem; }
.page h1 { font: 400 clamp(2.75rem, 10vw, 4.5rem)/1 var(--serif); letter-spacing: -0.02em; margin-bottom: 0.75rem; }
.page .meta { font: 400 0.75rem/1.4 var(--mono); color: var(--ink-2); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 2.5rem; }
.prose { max-width: 40rem; }
.prose h2 { font: 400 1.75rem/1.2 var(--serif); margin: 2.5rem 0 0.75rem; }
.prose p, .prose ul { margin-bottom: 1rem; color: var(--ink-2); }
.prose ul { padding-left: 1.25rem; list-style: square; }
.prose li { margin-bottom: 0.4rem; }
.prose strong { color: var(--ink); }
.prose a { color: var(--accent); }

/* ── Scroll reveal (only when JS is running) ──────────── */
.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity 700ms ease, transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1); }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ── Wider screens ────────────────────────────────────── */
@media (min-width: 40rem) {
  :root { --gutter: 32px; }
  .masthead__nav li:not(:last-child) { display: list-item; }
  .sec-head h2 { order: 1; flex-basis: auto; }
  .sec-head::after { order: 2; }
  .steps { grid-template-columns: repeat(3, 1fr); gap: 2rem; }
  .steps li { grid-template-columns: 1fr; gap: 0.75rem; }
  .ledger__row { grid-template-columns: 3.5rem 1fr auto; align-items: baseline; gap: 1.5rem; }
  .ledger__tool { grid-column: 3; grid-row: 1; justify-self: end; }
  .faq__item { grid-template-columns: 3.5rem 1fr; column-gap: 1.5rem; }
  .principles { grid-template-columns: 1fr 1fr; column-gap: 3rem; }
  .tabs__list { margin-inline: 0; padding-inline: 0; }
  .urlbar { grid-template-columns: auto 1fr auto; padding-left: 1.5rem; }
  .urlbar__label { grid-column: auto; }
  .footer__inner { grid-template-columns: auto 1fr auto; align-items: baseline; gap: 2rem; }
}

@media (min-width: 60rem) {
  .hero { padding-block: 5rem 6.5rem; min-height: calc(100svh - 3.5rem); display: grid; align-items: center; }
  .hero__grid { grid-template-columns: 1.25fr 1fr; gap: 4rem; }
  .receipt { --w: 22.5rem; }
  .what { grid-template-columns: 1fr; }
  .section { padding-block: 6.5rem; }
}

/* ── Motion preferences ───────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .reveal { opacity: 1; transform: none; }
  .receipt { transform: none; }
}