/* ==========================================================================
   Pharaoh's Key: Sand Mystery — core styles
   Direction: sun-bleached sandstone archive, verdigris ink, terracotta seal.
   Mobile-first. Desktop enhancements live in responsive.css.
   ========================================================================== */

:root {
  /* Surfaces */
  --paper: #F6F0E2;
  --paper-deep: #EDE4D0;
  --plate: #FFFDF6;
  --ink-field: #14322F;

  /* Ink */
  --ink: #2E2A22;
  --ink-muted: #5C5548;
  --ink-on-field: #EFE6D2;

  /* Accents */
  --verdigris: #0E6E6B;
  --terracotta: #A6431F;
  --brass: #D9A03C;

  /* Rules and plates */
  --rule: #C9BCA0;
  --rule-strong: #8C7F63;
  --disabled-plate: #2a2a2a;

  /* Type */
  --font-display: "Helvetica Neue", Helvetica, Arial, "Segoe UI", Roboto, sans-serif;
  --font-body: "Segoe UI", Roboto, -apple-system, BlinkMacSystemFont, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

  /* Metrics */
  --header-h: 48px;
  --gutter: 20px;
  --plate-shadow: 6px 6px 0 var(--rule-strong);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(140, 127, 99, 0.07) 0 1px, transparent 1px 28px);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  padding-bottom: 84px; /* clearance for the mobile sticky bar */
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--verdigris); }

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

/* --------------------------------------------------------- Sticky header */
.site-header {
  position: sticky; top: 0; z-index: 60;
  height: var(--header-h);
  display: flex; align-items: center; gap: 10px;
  padding: 0 var(--gutter);
  padding-left: max(var(--gutter), env(safe-area-inset-left));
  padding-right: max(var(--gutter), env(safe-area-inset-right));
  background: rgba(246, 240, 226, 0.96);
  border-bottom: 1px solid var(--rule-strong);
}

.header-brand {
  display: flex; align-items: center; gap: 9px;
  text-decoration: none; color: var(--ink);
  min-height: 44px; margin-right: auto;
}
.header-brand-icon { width: 32px; height: 32px; border: 1px solid var(--rule-strong); }
.header-brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.header-brand-name {
  font-family: var(--font-display);
  font-size: 14px; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
}
.header-brand-sub {
  font-family: var(--font-mono);
  font-size: 9.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-muted);
}

.header-nav { display: none; }

.header-cta {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; min-height: 44px;
  padding: 0 12px;
  background: var(--verdigris); color: #fff;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 13px; font-weight: 700;
  letter-spacing: 0.05em; text-transform: uppercase;
  border: 1px solid var(--ink-field);
  box-shadow: 3px 3px 0 var(--ink-field);
  transition: transform 140ms ease, box-shadow 140ms ease;
}
.header-cta-full { display: none; }
.header-cta-compact { display: inline-flex; }
.header-cta:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink-field); }
.header-cta:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink-field); }


/* Anchor jumps must clear the sticky header. */
#features,
#download,
#about { scroll-margin-top: calc(var(--header-h) + 8px); }

/* ------------------------------------------------------------------ Hero */
.hero {
  padding: 28px var(--gutter) 40px;
  border-bottom: 1px solid var(--rule);
}
.hero-grid { display: flex; flex-direction: column; gap: 22px; max-width: 1180px; margin: 0 auto; }

/* Numbered ledger rail — the four-beat loop of the game */
.ledger-rail {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--rule-strong);
  background: var(--plate);
}
.ledger-step {
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 9px 4px;
  border-right: 1px solid var(--rule);
}
.ledger-step:last-child { border-right: 0; }
.ledger-num {
  font-family: var(--font-mono);
  font-size: 15px; font-weight: 700; color: var(--terracotta);
}
.ledger-label {
  font-family: var(--font-display);
  font-size: 10.5px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-muted);
}

/* Dossier card — the primary text block */
.dossier {
  background: var(--plate);
  border: 1px solid var(--rule-strong);
  box-shadow: var(--plate-shadow);
  padding: 24px 18px 26px;
}
.dossier-tag {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--terracotta);
  padding-bottom: 8px; border-bottom: 1px solid var(--rule);
}
.dossier-icon {
  width: 76px; height: 76px;
  border: 1px solid var(--rule-strong);
  margin-bottom: 16px;
}
.dossier-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(26px, 8.2vw, 32px); font-weight: 800; line-height: 1.05;
  letter-spacing: -0.015em; text-transform: uppercase;
  color: var(--ink);
}
.dossier-title-sub {
  display: block; margin-top: 7px;
  font-size: 14px; font-weight: 700;
  letter-spacing: 0.22em; color: var(--verdigris);
}
.dossier-lede { margin: 0 0 22px; font-size: 15.5px; color: var(--ink-muted); }
.dossier-question {
  margin: 20px 0 0; padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-display);
  font-size: 15px; font-weight: 800;
  letter-spacing: 0.02em; text-transform: uppercase;
  color: var(--terracotta);
}

/* Banner shown as a catalogued specimen plate */
.specimen-plate {
  margin: 0;
  background: var(--plate);
  border: 1px solid var(--rule-strong);
  box-shadow: var(--plate-shadow);
  padding: 9px 9px 0;
}
.specimen-image { width: 100%; border: 1px solid var(--rule); }
.specimen-caption {
  padding: 9px 2px 10px;
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-muted);
}

/* ------------------------------------------------------- Store buttons */
.store-row { display: flex; flex-direction: column; gap: 12px; }

.store-btn {
  position: relative;
  display: flex; align-items: center; gap: 12px;
  width: 100%; min-height: 60px;
  padding: 10px 16px;
  font-family: var(--font-display);
  text-align: left; text-decoration: none;
  border: 1px solid var(--ink-field);
  cursor: pointer;
}
.store-btn-glyph { flex: 0 0 auto; }
.store-btn-text { display: flex; flex-direction: column; line-height: 1.15; }
.store-btn-kicker {
  font-size: 10px; font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase;
  opacity: 0.85;
}
.store-btn-brand { font-size: 17px; font-weight: 800; letter-spacing: 0.01em; }

/* Live Google Play button — flat label plate, hard offset shadow */
.store-btn-live {
  background: var(--verdigris); color: #fff;
  box-shadow: 5px 5px 0 var(--ink-field);
  transition: transform 150ms ease, box-shadow 150ms ease;
}
.store-btn-live:hover { transform: translate(-1px, -1px); box-shadow: 6px 6px 0 var(--ink-field); }
.store-btn-live:active { transform: translate(3px, 3px); box-shadow: 2px 2px 0 var(--ink-field); }

/* Disabled App Store button — neutral grey, never brand-coloured */
.store-btn-pending {
  background: var(--disabled-plate); color: #fff;
  border-color: #1a1a1a;
  box-shadow: 5px 5px 0 rgba(26, 26, 26, 0.5);
  opacity: 0.55;
  filter: grayscale(0.6);
  cursor: not-allowed;
}
/* The button-level opacity already dims this variant; avoid stacking a second alpha. */
.store-btn-pending .store-btn-kicker { opacity: 1; }

.store-btn-notice {
  position: absolute; top: -9px; right: 10px;
  padding: 2px 7px;
  background: var(--ink-field); color: var(--ink-on-field);
  font-family: var(--font-mono);
  font-size: 9px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase;
  border: 1px solid #000;
}

/* -------------------------------------------------------------- Features */
.features { padding: 42px var(--gutter) 46px; max-width: 1180px; margin: 0 auto; }

.section-head { margin-bottom: 26px; }
.section-tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--terracotta);
}
.section-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 25px; font-weight: 800; line-height: 1.2;
  letter-spacing: -0.01em; text-transform: uppercase;
  color: var(--ink);
}
.section-lede { margin: 0; font-size: 15px; color: var(--ink-muted); }

.catalogue { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.catalogue-card {
  background: var(--plate);
  border: 1px solid var(--rule-strong);
  border-left: 4px solid var(--verdigris);
  padding: 18px 16px;
}
.catalogue-index {
  display: block; margin-bottom: 9px;
  font-family: var(--font-mono);
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.16em; color: var(--terracotta);
}
.catalogue-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px; font-weight: 800;
  letter-spacing: 0.01em; color: var(--ink);
}
.catalogue-text { margin: 0; font-size: 14.5px; color: var(--ink-muted); }
.catalogue-card:active { border-left-color: var(--terracotta); }

/* ---------------------------------------------------------- Download CTA */
.download {
  padding: 46px var(--gutter) 50px;
  background-color: var(--ink-field);
  background-image:
    repeating-linear-gradient(0deg, rgba(239, 230, 210, 0.05) 0 1px, transparent 1px 30px);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
}
.download-inner { max-width: 760px; margin: 0 auto; }
.download-tag {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 10.5px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--brass);
}
.download-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 28px; font-weight: 800; line-height: 1.12;
  letter-spacing: -0.015em; text-transform: uppercase;
  color: #fff;
}
.download-lede { margin: 0 0 26px; font-size: 15.5px; color: var(--ink-on-field); }

.store-row-dark .store-btn-live {
  background: var(--brass); color: #1D1400;
  border-color: #0A0700;
  box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.55);
}
.store-row-dark .store-btn-live:hover { box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.6); }
.store-row-dark .store-btn-live:active { box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.55); }
.store-row-dark .store-btn-notice { background: var(--paper); color: var(--ink); border-color: var(--ink); }

/* ----------------------------------------------------------------- About */
.about { padding: 44px var(--gutter) 48px; }
.about-inner { max-width: 760px; margin: 0 auto; }
.about-icon {
  width: 64px; height: 64px;
  border: 1px solid var(--rule-strong);
  margin: 0 0 18px;
}
.about-text { margin: 0 0 16px; font-size: 15.5px; color: var(--ink-muted); }
.about-contact {
  margin: 22px 0 0; padding-top: 16px;
  border-top: 1px solid var(--rule);
  font-size: 14.5px; color: var(--ink);
}
.about-mail { color: var(--verdigris); font-weight: 700; word-break: break-all; }

/* ---------------------------------------------------------------- Footer */
.site-footer {
  padding: 32px var(--gutter) 36px;
  background: var(--paper-deep);
  border-top: 1px solid var(--rule-strong);
  text-align: center;
}
.footer-brand {
  display: flex; align-items: center; justify-content: center; gap: 10px;
  margin-bottom: 14px;
}
.footer-icon { width: 40px; height: 40px; border: 1px solid var(--rule-strong); }
.footer-name {
  font-family: var(--font-display);
  font-size: 14px; font-weight: 800;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--ink);
}
.footer-mail {
  display: inline-flex; align-items: center;
  min-height: 44px;
  font-size: 14px; color: var(--verdigris);
  word-break: break-all;
}
.footer-legal { display: flex; align-items: center; justify-content: center; gap: 10px; }
.footer-legal a {
  display: inline-flex; align-items: center;
  min-height: 44px; padding: 0 4px;
  font-size: 14px; color: var(--ink);
}
.footer-sep { color: var(--rule-strong); }
.footer-copy {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 11px; letter-spacing: 0.06em;
  color: var(--ink-muted);
}

/* ------------------------------------------------------ Mobile sticky CTA */
.sticky-cta {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 70;
  display: flex; align-items: center; gap: 11px;
  padding: 10px var(--gutter);
  padding-bottom: max(10px, env(safe-area-inset-bottom));
  background: rgba(20, 50, 47, 0.98);
  border-top: 1px solid var(--brass);
  transform: translateY(110%);
  transition: transform 240ms ease;
}
.sticky-cta.is-visible { transform: translateY(0); }
.sticky-cta-icon { width: 36px; height: 36px; border: 1px solid var(--brass); }
.sticky-cta-text {
  display: flex; flex-direction: column; line-height: 1.2;
  margin-right: auto; min-width: 0;
}
.sticky-cta-name {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-family: var(--font-display);
  font-size: 13px; font-weight: 800;
  letter-spacing: 0.04em; text-transform: uppercase; color: #fff;
}
.sticky-cta-sub {
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.08em; color: var(--ink-on-field);
}
.sticky-cta-btn {
  flex: 0 0 auto;
  display: inline-flex; align-items: center;
  min-height: 44px; padding: 0 15px;
  background: var(--brass); color: #1D1400;
  text-decoration: none;
  font-family: var(--font-display);
  font-size: 13px; font-weight: 800;
  letter-spacing: 0.05em; text-transform: uppercase;
  border: 1px solid #0A0700;
}
.sticky-cta-btn:active { background: #C08D2E; }

/* ------------------------------------------------ Stamp-press reveal */
.reveal {
  opacity: 0;
  transform: translateY(14px) scale(1.02);
  transition: opacity 460ms ease, transform 460ms cubic-bezier(0.2, 0.9, 0.25, 1);
}
.reveal.is-revealed { opacity: 1; transform: translateY(0) scale(1); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .sticky-cta { transition: none; }
}