/* CurbCues — strictly achromatic, derived from the app's own palette.
   The three tier shades are the exact button values from ContentView.swift. */

:root {
  --ink:    #000000;
  --paper:  #ffffff;
  --tier-1: #ffffff;   /* Intersection button, Color(white: 1.00) */
  --tier-2: #c4c4c4;   /* Address button,      Color(white: 0.77) */
  --tier-3: #8f8f8f;   /* Food Nearby button,  Color(white: 0.56) */
  --dim:    #9a9a9a;
  --dimmer: #8a8a8a;
  --rule:   #262626;
  --panel:  #0d0d0d;

  --display: ui-rounded, "SF Pro Rounded", "Hiragino Maru Gothic ProN",
             system-ui, -apple-system, "Segoe UI", sans-serif;
  --body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;

  --measure: 34rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

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

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

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--body);
  font-size: clamp(1.0625rem, 0.98rem + 0.4vw, 1.1875rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Accessibility floor ---------- */

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--paper);
  color: var(--ink);
  padding: 0.75rem 1.25rem;
  font-weight: 700;
  z-index: 100;
}
.skip:focus { left: 0; }

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

/* ---------- Layout ---------- */

.wrap {
  max-width: 62rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.band { padding-block: clamp(3.5rem, 9vw, 7rem); }
.band + .band { border-top: 1px solid var(--rule); }

/* ---------- Masthead ---------- */

.masthead {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1rem;
  padding-block: clamp(2rem, 5vw, 3rem) 1.5rem;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--paper);
}

/* 300px on desktop, but never wider than the viewport allows on a phone. */
.mark {
  width: 300px;
  max-width: 72vw;
  height: auto;
  display: block;
  border-radius: 22%;   /* echoes the iOS home screen mask */
}

.wordmark {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.75rem, 1.3rem + 1.8vw, 2.5rem);
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--paper);
}

.masthead nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.masthead nav a { color: var(--dim); text-decoration: none; }
.masthead nav a:hover { color: var(--paper); text-decoration: underline; }

/* ---------- Hero: the announcement is the thesis ---------- */

.hero { padding-block: clamp(2.5rem, 7vw, 5rem) clamp(3rem, 8vw, 6rem); }

.eyebrow {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dimmer);
  margin: 0 0 1.75rem;
}

/* The app's real output, set as the largest thing on the page. */
.utterance {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2rem, 1rem + 5.2vw, 4.25rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 0;
  max-width: 20ch;
  text-wrap: balance;
}

.utterance .said { color: var(--dimmer); }

.lede {
  font-size: clamp(1.125rem, 1rem + 0.6vw, 1.4375rem);
  line-height: 1.5;
  color: var(--tier-2);
  max-width: var(--measure);
  margin: 2rem 0 0;
}

/* Speech unfolds in time — the one motion moment on the site. */
@media (prefers-reduced-motion: no-preference) {
  .utterance > span {
    display: inline-block;
    opacity: 0;
    animation: speak 0.5s ease-out forwards;
  }
  .utterance > span:nth-child(1) { animation-delay: 0.10s; }
  .utterance > span:nth-child(2) { animation-delay: 0.34s; }
  .utterance > span:nth-child(3) { animation-delay: 0.58s; }
}

@keyframes speak {
  from { opacity: 0; transform: translateY(0.18em); }
  to   { opacity: 1; transform: none; }
}

/* ---------- Buttons ---------- */

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem;
  margin-top: 2.5rem;
}

.btn {
  display: inline-block;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.125rem;
  padding: 1rem 1.75rem;
  border-radius: 12px;
  text-decoration: none;
  border: 3px solid var(--paper);
}

.btn-solid { background: var(--paper); color: var(--ink); }
.btn-solid:hover { background: var(--tier-2); border-color: var(--tier-2); }

.btn-hollow { background: transparent; color: var(--paper); }
.btn-hollow:hover { background: #1a1a1a; }

/* ---------- Tiers: brightness order mirrors the app's buttons ---------- */

.tier {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  padding-block: clamp(2rem, 4vw, 2.75rem);
}
.tier + .tier { border-top: 1px solid var(--rule); }

.tier-bar { border-radius: 5px; }
.tier-1 .tier-bar { background: var(--tier-1); }
.tier-2 .tier-bar { background: var(--tier-2); }
.tier-3 .tier-bar { background: var(--tier-3); }

.tier h3 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.125rem);
  letter-spacing: -0.02em;
  margin: 0 0 0.625rem;
}
.tier-1 h3 { color: var(--tier-1); }
.tier-2 h3 { color: var(--tier-2); }
.tier-3 h3 { color: var(--tier-3); }

.tier p { margin: 0 0 1.125rem; max-width: var(--measure); color: var(--tier-2); }

/* Sample announcement, quoted as speech rather than styled as code. */
.sample {
  font-family: var(--display);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--paper);
  border-left: 2px solid var(--rule);
  padding: 0.25rem 0 0.25rem 1.125rem;
  margin: 0;
  max-width: var(--measure);
}
.sample::before { content: "\201C"; }
.sample::after  { content: "\201D"; }

/* ---------- Headings ---------- */

h1, h2 { font-family: var(--display); letter-spacing: -0.025em; }

.band-title {
  font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.75rem);
  font-weight: 800;
  margin: 0 0 2.5rem;
}

.page-title {
  font-size: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  font-weight: 800;
  margin: 0 0 0.75rem;
}

.updated { color: var(--dimmer); font-size: 0.9375rem; margin: 0 0 3rem; }

/* ---------- Feature list ---------- */

.features { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.5rem; }
@media (min-width: 46rem) { .features { grid-template-columns: 1fr 1fr; gap: 1.75rem 3rem; } }

.features li { border-top: 1px solid var(--rule); padding-top: 1.125rem; }
.features strong {
  display: block;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.1875rem;
  margin-bottom: 0.3125rem;
}
.features span { color: var(--dim); }

/* ---------- Prose (privacy + support) ---------- */

.prose { max-width: 40rem; }
.prose h2 {
  font-size: clamp(1.375rem, 1.1rem + 1.1vw, 1.75rem);
  font-weight: 800;
  margin: 3rem 0 0.875rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
}
.prose h2:first-of-type { margin-top: 0; }
.prose h3 {
  font-family: var(--display);
  font-size: 1.1875rem;
  font-weight: 700;
  margin: 2rem 0 0.5rem;
}
.prose p, .prose li { color: var(--tier-2); }
.prose ul { padding-left: 1.25rem; }
.prose li { margin-bottom: 0.625rem; }
.prose a { color: var(--paper); }
.prose strong { color: var(--paper); }

.callout {
  border: 1px solid var(--rule);
  background: var(--panel);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 2rem 0;
}
.callout p:last-child { margin-bottom: 0; }

/* ---------- Footer ---------- */

.foot {
  border-top: 1px solid var(--rule);
  padding-block: 3rem 4rem;
  color: var(--dimmer);
  font-size: 0.9375rem;
}
.foot nav { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-bottom: 1.5rem; }
.foot a { color: var(--dim); }
.foot p { margin: 0.5rem 0 0; max-width: var(--measure); }

/* Lede sitting directly under a band title needs no extra top space. */
.lede-tight { margin-top: 0; }

/* Deployment marker — bump this string to confirm a push actually went live. */
.docversion {
  margin: 0;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

/* Safety caution — first thing inside <main>, so anyone using the skip link
   still lands on it. Deliberately not dimmed: this is not fine print. */
.caution {
  border: 2px solid var(--paper);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 0 0 clamp(2rem, 5vw, 3rem);
  max-width: 46rem;
}

.caution p {
  margin: 0;
  color: var(--paper);
  font-size: 1rem;
  line-height: 1.55;
}

.caution strong {
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: 0.01em;
}

/* Scope clarification. Quieter than .caution — this corrects an expectation
   rather than warning about a hazard, so it should not compete with it. */
.notnav {
  border-left: 3px solid var(--tier-3);
  padding: 0.25rem 0 0.25rem 1.25rem;
  margin: 0 0 clamp(2rem, 5vw, 3rem);
  max-width: 46rem;
}

.notnav p {
  margin: 0;
  color: var(--tier-2);
  font-size: 1rem;
  line-height: 1.55;
}

.notnav strong {
  font-family: var(--display);
  font-weight: 800;
  color: var(--paper);
}