/* ---------- Tokens ---------- */
/* Numerals red comes from the app icon (the red cube). Never hardcode a color below:
   add a token here and to the dark block. */
:root {
  --color-brand: #c40000;
  --color-brand-hover: #9e0000;
  --color-brand-tint: rgba(196, 0, 0, 0.07);
  --color-ink: #1d1d1f;
  --color-muted: #6e6e73;
  --color-paper: #ffffff;
  --color-paper-alt: #f4f4f6;
  --color-card: #ffffff;
  --color-line: rgba(0, 0, 0, 0.08);
  --color-placeholder: #f0f0f2;
  --color-placeholder-line: rgba(0, 0, 0, 0.22);
  --color-on-brand: #ffffff;
  --color-success: #1e7b45;
  --color-error: #b42318;

  /* Waitlist footer: always dark, after the app's black launch screen. */
  --color-night: #0b0b0c;
  --color-on-night: #ffffff;
  --color-on-night-soft: rgba(255, 255, 255, 0.6);
  --color-on-night-field: rgba(255, 255, 255, 0.08);
  --color-on-night-line: rgba(255, 255, 255, 0.18);
  --color-on-night-success: #c4f5d6;
  --color-on-night-error: #ffd4cc;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, Roboto, sans-serif;
  /* No webfont: these ship with macOS/iOS (Noto) and Windows (Segoe UI Historic). */
  --font-hieroglyphs: "Noto Sans Egyptian Hieroglyphs", "Segoe UI Historic", sans-serif;

  --max-width: 1120px;
  --radius: 20px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-brand: #ff4d42;
    --color-brand-hover: #ff7068;
    --color-brand-tint: rgba(255, 77, 66, 0.12);
    --color-ink: #f2f2f4;
    --color-muted: #a1a1a8;
    --color-paper: #0f0f11;
    --color-paper-alt: #17171a;
    --color-card: #1e1e22;
    --color-line: rgba(255, 255, 255, 0.1);
    --color-placeholder: #1e1e22;
    --color-placeholder-line: rgba(255, 255, 255, 0.25);
    --color-on-brand: #ffffff;
    --color-success: #4cc38a;
    --color-error: #f97066;
  }
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 {
  line-height: 1.12;
  letter-spacing: -0.022em;
  margin: 0 0 0.5em;
  font-weight: 600;
}

p { margin: 0 0 1em; }

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

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  background: var(--color-brand);
  color: var(--color-on-brand);
  padding: 10px 16px;
  border-radius: 12px;
}
.skip-link:focus { left: 12px; top: 12px; }

.eyebrow {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-brand);
  margin-bottom: 14px;
}

.section-intro {
  max-width: 640px;
  font-size: 19px;
  color: var(--color-muted);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 24px;
  border-radius: 14px;
  border: 1px solid transparent;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn:focus-visible { outline: 2px solid var(--color-brand); outline-offset: 2px; }
.btn:disabled { opacity: 0.6; cursor: wait; }

.btn-primary { background: var(--color-brand); color: var(--color-on-brand); }
.btn-primary:hover { background: var(--color-brand-hover); }

.btn-ghost { color: var(--color-ink); border-color: var(--color-line); }
.btn-ghost:hover { border-color: var(--color-brand); color: var(--color-brand); }

.btn-small { padding: 8px 16px; font-size: 14px; border-radius: 12px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-paper) 82%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-ink);
  text-decoration: none;
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.brand-icon { border-radius: 8px; }

.header-nav { display: flex; align-items: center; gap: 24px; }
.nav-link { color: var(--color-muted); text-decoration: none; font-size: 14px; }
.nav-link:hover { color: var(--color-ink); }

/* ---------- Hero ---------- */
.hero { padding: 80px 0 96px; }
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 72px;
  align-items: center;
}
.hero h1 { font-size: clamp(36px, 5.4vw, 60px); letter-spacing: -0.03em; }
.lead { font-size: 20px; color: var(--color-muted); max-width: 580px; margin-top: 24px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

/* App screenshots sit in a plain rounded frame, not a drawn device. */
.phone {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: 36px;
  background: var(--color-card);
}
.phone img { width: 100%; aspect-ratio: 780 / 1698; object-fit: cover; }
.hero-phone { box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.35); }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: var(--color-paper-alt); }
.section h2 { font-size: clamp(28px, 3.6vw, 42px); }

/* ---------- Systems ---------- */
.systems { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 48px; }
.system-group h3 { font-size: 20px; margin-bottom: 4px; }
.group-note { color: var(--color-muted); font-size: 15px; margin-bottom: 16px; }

.system-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--color-card);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}
.system-list li {
  display: grid;
  grid-template-columns: 9.5em 1fr;
  align-items: baseline;
  gap: 8px 24px;
  padding: 16px 18px;
}
.system-list li + li { border-top: 1px solid var(--color-line); }
.system-list strong { font-size: 17px; font-weight: 600; }
.system-list span { color: var(--color-muted); font-size: 15px; }

/* ---------- Notation options ---------- */
.option-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 48px;
}
.option-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 26px 24px;
}
.option-card h3 { font-size: 20px; margin-bottom: 6px; }
.option-card > p { color: var(--color-muted); font-size: 15px; }

.option-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 18px 0 0; }
.option-pair > div { background: var(--color-brand-tint); border-radius: 14px; padding: 12px 14px; }
.option-pair dt { font-size: 12px; color: var(--color-muted); margin-bottom: 4px; }
.option-pair dd { margin: 0; font-size: 22px; overflow-wrap: anywhere; }
.option-pair dd[dir="rtl"] { text-align: left; }

.hieroglyphs { font-family: var(--font-hieroglyphs); }

.fine-print { color: var(--color-muted); font-size: 14px; max-width: 720px; margin: 28px 0 0; }

/* ---------- The app ---------- */
.gallery {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-top: 48px;
}
.shot { margin: 0; }
.shot .phone { border-radius: 28px; }
.shot figcaption { font-size: 14px; color: var(--color-muted); margin-top: 14px; }

/* Missing-image placeholder: dashed frame, icon, bold target filename, what the
   asset should show, and its aspect. Keep all five so a gap is obvious. */
.placeholder-frame {
  aspect-ratio: 780 / 1698;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 16px;
  text-align: center;
  font-size: 13px;
  color: var(--color-muted);
  background: var(--color-placeholder);
  border: 1px dashed var(--color-placeholder-line);
}
.placeholder-frame svg { width: 36px; height: 36px; margin-bottom: 6px; }
.placeholder-frame p { margin: 0; }
.placeholder-frame strong { color: var(--color-ink); }
.placeholder-aspect { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; }

/* ---------- Audience ---------- */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 40px;
}
.audience-grid article { border-top: 2px solid var(--color-brand); padding-top: 24px; }
.audience-grid h3 { font-size: 20px; }
.audience-grid p { color: var(--color-muted); margin: 0; }

/* ---------- Good to know ---------- */
.facts {
  list-style: none;
  padding: 0;
  margin: 36px 0 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px 40px;
}
.facts li { color: var(--color-muted); font-size: 16px; padding-left: 18px; border-left: 2px solid var(--color-line); }
.facts strong { color: var(--color-ink); display: block; margin-bottom: 4px; }

/* ---------- Footer & waitlist ---------- */
.site-footer {
  background: var(--color-night);
  color: var(--color-on-night);
  padding: 96px 0 32px;
}
.notify { max-width: 560px; margin: 0 auto; text-align: center; }
.notify-icon { margin: 0 auto 24px; border-radius: 14px; }
.notify h2 { font-size: clamp(28px, 4vw, 40px); }
.notify-sub { color: var(--color-on-night-soft); }

.notify-form { margin-top: 28px; }
.notify-row { display: flex; gap: 10px; }
.notify-row input {
  flex: 1;
  min-width: 0;
  font: inherit;
  font-size: 16px;
  color: var(--color-on-night);
  background: var(--color-on-night-field);
  border: 1px solid var(--color-on-night-line);
  border-radius: 14px;
  padding: 12px 16px;
}
.notify-row input::placeholder { color: var(--color-on-night-soft); }
.notify-row input:focus { outline: 2px solid var(--color-brand); outline-offset: 1px; }

.form-note { font-size: 13px; color: var(--color-on-night-soft); margin: 12px 0 0; }
.form-note a, .form-status a { color: var(--color-on-night); }
.form-status { font-size: 15px; margin: 10px 0 0; min-height: 1.5em; }
.form-status.is-ok { color: var(--color-on-night-success); }
.form-status.is-error { color: var(--color-on-night-error); }

/* Honeypot field: off-screen rather than display:none, which some bots skip. */
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.footer-meta {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 80px;
  padding-top: 24px;
  border-top: 1px solid var(--color-on-night-line);
  font-size: 13px;
  color: var(--color-on-night-soft);
}
.footer-meta p { margin: 0; }
.footer-meta nav { display: flex; flex-wrap: wrap; gap: 8px; }
.footer-meta a { color: var(--color-on-night-soft); text-decoration: none; }
.footer-meta a:hover { color: var(--color-on-night); }

/* ---------- App privacy page ---------- */
.doc { max-width: 720px; }
.doc h1 { font-size: clamp(30px, 4vw, 42px); }
.doc h2 { font-size: 21px; margin-top: 2em; }
.doc-meta { color: var(--color-muted); font-size: 15px; }
.doc ul { padding-left: 1.2em; }
.doc li { margin-bottom: 0.6em; }

.site-footer-plain { padding: 0 0 32px; }
.site-footer-plain .footer-meta { margin-top: 0; border-top: none; padding-top: 32px; }

/* ---------- Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .gallery { grid-template-columns: repeat(3, 1fr); }
  .systems { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .nav-link { display: none; }
  .hero { padding: 48px 0 64px; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-phone { max-width: 260px; margin: 0 auto; }
  .section { padding: 64px 0; }
  .system-list li { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: repeat(2, 1fr); }
  .audience-grid, .facts { grid-template-columns: 1fr; }
  .notify-row { flex-direction: column; }
  .footer-meta, .footer-meta nav { justify-content: center; text-align: center; }
}