/* MathScroll site. Colors and type follow the app's design tokens
   (Shared/Theme/Colors.swift). */

@font-face {
  font-family: "Archivo";
  src: url("/fonts/archivo.woff2") format("woff2");
  font-weight: 100 900;
  font-stretch: 62% 125%;
  font-display: swap;
}

:root {
  --lime: #c9e600;
  --lime-light: #f1fbb0;
  --olive: #3a4a06;
  --ink: #121310;
  --canvas: #0e0f0c;
  --surface: #1b1c18;
  --surface-2: #26271f;
  --paper: #fcfcf9;
  --muted: #9a9b93;
  --dim: #6b6c64;
  --flame: #ff9f2e;
  --display: "Archivo", ui-sans-serif, system-ui, sans-serif;
  --body: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: dark;
}

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

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

body {
  margin: 0;
  background: var(--canvas);
  color: var(--paper);
  font: 17px/1.6 var(--body);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--lime); text-underline-offset: 3px; }
a:hover { color: var(--lime-light); }

.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.prose-wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }

/* Header */

.site-header { padding: 20px 0; }
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--paper); text-decoration: none;
  font: 800 20px/1 var(--display); letter-spacing: -0.5px;
}
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.brand:hover { color: var(--paper); }
.nav { display: flex; gap: 18px; font-size: 15px; font-weight: 600; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--paper); }

/* Home */

.hero { padding: 48px 0 32px; display: grid; gap: 40px; align-items: center; }
@media (min-width: 860px) { .hero { grid-template-columns: 1.15fr 0.85fr; padding: 72px 0 56px; } }

.eyebrow {
  display: inline-block; margin: 0 0 18px;
  padding: 6px 14px; border-radius: 999px;
  background: var(--surface); color: var(--lime);
  font: 700 13px/1.2 var(--display); letter-spacing: 1.5px; text-transform: uppercase;
}
.hero h1 {
  margin: 0;
  font: 900 clamp(52px, 11vw, 104px)/0.92 var(--display);
  font-stretch: 112%;
  letter-spacing: -0.04em;
}
.hero h1 em { font-style: normal; color: var(--lime); }
.lede { margin: 22px 0 0; max-width: 34em; color: var(--muted); font-size: 19px; }

.store-cta {
  display: inline-flex; align-items: center; gap: 10px;
  margin-top: 30px; padding: 16px 26px; border-radius: 999px;
  background: var(--lime); color: var(--ink); text-decoration: none;
  font: 800 18px/1 var(--display);
}
.store-cta[aria-disabled="true"] { cursor: default; }
.store-cta svg { width: 20px; height: 20px; }
.cta-note { margin: 12px 0 0 4px; color: var(--dim); font-size: 14px; }

/* The locked-feed card on the home page. */
.gate {
  position: relative;
  max-width: 360px; width: 100%; justify-self: center;
  padding: 26px 24px 24px; border-radius: 36px;
  background: var(--paper); color: var(--ink);
  box-shadow: 0 30px 80px rgba(201, 230, 0, 0.12);
  transform: rotate(1.5deg);
}
.gate .bubble {
  position: absolute; top: -18px; left: 22px;
  padding: 8px 14px; border-radius: 16px 16px 16px 4px;
  background: var(--lime); color: var(--ink);
  font: 800 14px/1 var(--display);
  transform: rotate(-4deg);
}
.gate .lock {
  display: flex; align-items: center; gap: 8px;
  color: var(--dim); font-size: 14px; font-weight: 600;
}
.gate .problem {
  margin: 26px 0 8px;
  font: 900 64px/1 var(--display); font-stretch: 110%; letter-spacing: -0.03em;
}
.gate .answer {
  height: 64px; border-radius: 18px; margin-top: 14px;
  background: #f0f0ea; display: flex; align-items: center; padding: 0 18px;
  font: 800 30px/1 var(--display); color: #b9bab2;
}
.gate .keys { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 14px; }
.gate .keys span {
  height: 46px; border-radius: 14px; background: #f0f0ea;
  display: grid; place-items: center; font: 800 20px/1 var(--display);
}
.gate .progress { display: flex; gap: 5px; margin-top: 18px; }
.gate .progress i { flex: 1; height: 6px; border-radius: 3px; background: #e4e4dc; }
.gate .progress i.done { background: var(--ink); }

.steps { display: grid; gap: 14px; padding: 24px 0 8px; }
@media (min-width: 760px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step { padding: 26px 24px; border-radius: 30px; background: var(--surface); }
.step .num {
  display: grid; place-items: center; width: 38px; height: 38px; border-radius: 50%;
  background: var(--lime); color: var(--ink); font: 900 18px/1 var(--display);
}
.step h2 { margin: 18px 0 6px; font: 800 24px/1.1 var(--display); letter-spacing: -0.5px; }
.step p { margin: 0; color: var(--muted); font-size: 16px; }

.statement { padding: 72px 0; text-align: center; }
.statement h2 {
  margin: 0 auto; max-width: 14em;
  font: 900 clamp(36px, 6.5vw, 64px)/1 var(--display); letter-spacing: -0.035em;
}
.statement h2 em { font-style: normal; color: var(--lime); }
.statement p { margin: 18px auto 0; max-width: 32em; color: var(--muted); }

.private {
  display: grid; gap: 14px; margin-bottom: 72px;
  padding: 30px 26px; border-radius: 32px; background: var(--surface);
}
@media (min-width: 760px) { .private { grid-template-columns: 1fr 1fr; padding: 40px; } }
.private h2 { margin: 0; font: 800 28px/1.1 var(--display); letter-spacing: -0.5px; }
.private ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.private li { display: flex; gap: 10px; color: var(--paper); }
.private li::before { content: "✓"; color: var(--lime); font-weight: 800; }

/* Legal and support pages */

.page-head { padding: 40px 0 8px; }
.page-head h1 {
  margin: 0; font: 900 clamp(40px, 8vw, 60px)/1 var(--display); letter-spacing: -0.035em;
}
.page-head .meta { margin: 14px 0 0; color: var(--muted); font-size: 15px; }

.summary {
  margin: 28px 0 8px; padding: 22px 24px; border-radius: 24px;
  background: var(--surface); border: 1px solid var(--surface-2);
}
.summary h2 { margin: 0 0 8px !important; font-size: 18px !important; color: var(--lime); }
.summary ul { margin: 0; padding-left: 20px; }

.prose { padding-bottom: 72px; }
.prose h2 { margin: 44px 0 10px; font: 800 26px/1.15 var(--display); letter-spacing: -0.5px; }
.prose h3 { margin: 28px 0 6px; font: 800 19px/1.25 var(--display); }
.prose p, .prose li { color: #dcdcd5; }
.prose ul { padding-left: 22px; }
.prose li + li { margin-top: 6px; }
.prose strong { color: var(--paper); }

.contact-card {
  margin: 30px 0 10px; padding: 26px; border-radius: 28px;
  background: var(--lime); color: var(--ink);
}
.contact-card h2 { margin: 0 !important; color: var(--ink); }
.contact-card p { margin: 8px 0 0; color: var(--olive) !important; }
.contact-card a.mail {
  display: inline-block; margin-top: 16px; padding: 13px 22px; border-radius: 999px;
  background: var(--ink); color: var(--paper); text-decoration: none;
  font: 800 17px/1 var(--display);
}

details {
  border-radius: 20px; background: var(--surface); padding: 0 20px;
  margin-top: 10px;
}
details summary {
  cursor: pointer; list-style: none; padding: 18px 0;
  font: 700 18px/1.3 var(--display); color: var(--paper);
  display: flex; justify-content: space-between; gap: 16px;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; color: var(--lime); font-weight: 900; }
details[open] summary::after { content: "−"; }
details > :not(summary) { margin-top: 0; }
details > :last-child { padding-bottom: 18px; margin-bottom: 0; }

/* Footer */

.site-footer { border-top: 1px solid var(--surface-2); padding: 28px 0 40px; color: var(--dim); font-size: 14px; }
.site-footer .wrap { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
.site-footer a { color: var(--muted); text-decoration: none; }
.site-footer a:hover { color: var(--paper); }

@media (max-width: 420px) {
  .nav { gap: 14px; font-size: 14px; }
  .brand span { display: none; }
}