/* ============================================================
   Threadcheck — threadcheck.app
   Clean monochrome, straight from the app's Theme.swift.
   Newsreader (display + prose) · JetBrains Mono (labels / data)
   White surfaces · near-black ink · teal brand accent · butter-gold premium
   ============================================================ */

:root {
  /* surfaces — monochrome, white-on-light-gray (Theme.swift) */
  --paper:      #FFFFFF;   /* cards */
  --paper-2:    #F2F2F4;   /* page / secondary surface */
  --paper-3:    #F7F7F9;   /* subtle inset */
  --ink:        #1A1A1A;   /* text */
  --ink-soft:   #6B6B72;   /* secondary text */
  --ink-faint:  #A6A6AD;   /* tertiary text */
  --rule:       #E6E6EA;   /* borders / dividers */
  --navy:       #2A2A2E;

  /* brand accent — the teal from the logo + splash hero */
  --teal:       #02C7C6;   /* bright fill / icon */
  --teal-deep:  #0064E2;   /* gradient end */
  --teal-ink:   #0C8F8C;   /* legible teal for text / em on white */

  /* premium — butter gold (crown, best value) */
  --gold:       #C89638;
  --warn:       #9A6B1E;

  /* fibre-semantic */
  --sage:       #8B9C6D;
  --stone:      #A59F8F;

  /* grade tones (ResultCard) */
  --grade-a-bg:    #DCE6C4;
  --grade-a-ink:   #3E4F26;
  --grade-a-badge: #5C7A3E;
  --grade-c-bg:    #F2E2BC;
  --grade-c-ink:   #6E4A12;
  --grade-c-badge: #9A6B1E;
  --grade-e-bg:    #EFD9CF;
  --grade-e-ink:   #6E2418;
  --grade-e-badge: #8C3B2E;

  --font-display: "Newsreader", "Iowan Old Style", Georgia, serif;
  --font-serif:   "Newsreader", "Iowan Old Style", Georgia, serif;
  --font-mono:    "JetBrains Mono", "SF Mono", Menlo, monospace;

  --measure: 64ch;
  --radius: 18px;
  --grad-teal: linear-gradient(140deg, var(--teal) 0%, var(--teal-deep) 100%);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper-2);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 19px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
}

::selection { background: color-mix(in srgb, var(--teal) 22%, #fff); color: var(--ink); }

img { display: block; max-width: 100%; }
a { color: inherit; }

/* ---------- type helpers ---------- */

.kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--teal-ink);
}

.display {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.005em;
}

.display em, .prose h1 em, h2 em {
  font-style: italic;
  color: var(--teal-ink);
}

.lede {
  font-family: var(--font-serif);
  color: var(--ink-soft);
  font-size: 21px;
  line-height: 1.5;
}

.mono-note {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

/* ---------- layout ---------- */

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

section { position: relative; }

/* ruled divider with mono label, like a section of a care label */
.rule-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 14px;
}
.rule-head::before, .rule-head::after {
  content: "";
  height: 1px;
  background: var(--rule);
  flex: 1;
}
.rule-head span {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--ink-soft);
  white-space: nowrap;
}

/* ---------- header ---------- */

.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper-2) 82%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--rule);
}
.site-head .wrap {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 64px;
}
.lockup {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-right: auto;
}
.lockup img {
  width: 30px; height: 30px;
  border-radius: 9px;
  box-shadow: 0 1px 3px rgba(2,100,226,0.22);
}
.lockup span {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 500;
}
.site-nav { display: flex; gap: 24px; align-items: center; }
.site-nav a {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-decoration: none;
  color: var(--ink-soft);
  transition: color 0.15s;
}
.site-nav a:hover { color: var(--ink); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  background: var(--ink);
  color: #fff;
  padding: 13px 22px;
  border-radius: 14px;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  box-shadow: 0 2px 0 rgba(26,26,26,0.22);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(26,26,26,0.2); }
.btn.small { padding: 9px 16px; font-size: 11.5px; border-radius: 11px; }
.btn.teal {
  background: var(--grad-teal);
  box-shadow: 0 2px 0 rgba(2,100,226,0.25);
}
.btn.teal:hover { box-shadow: 0 8px 20px rgba(2,150,200,0.35); }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
  box-shadow: none;
}
.btn.ghost:hover { border-color: var(--teal); color: var(--teal-ink); box-shadow: none; }

/* App Store download button — dark pill, "Download for " + Apple mark */
.btn-app {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", system-ui, sans-serif;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: #fff;
  background: #1d1d20;
  padding: 15px 30px;
  border-radius: 999px;
  box-shadow: 0 2px 0 rgba(0,0,0,0.22);
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn-app:hover { transform: translateY(-1px); background: #000; box-shadow: 0 8px 22px rgba(0,0,0,0.26); }
.btn-app svg { width: 17px; height: 17px; fill: #fff; margin: -2px 0 0 1px; flex: none; }
.btn-app.small { font-size: 13.5px; padding: 9px 18px; gap: 7px; }
.btn-app.small svg { width: 13px; height: 13px; }

@media (max-width: 760px) {
  .site-nav a:not(.btn) { display: none; }
}

/* ---------- footer ---------- */

.site-foot {
  border-top: 1px solid var(--rule);
  background: var(--paper);
  margin-top: 110px;
}
.site-foot .wrap {
  padding-top: 48px;
  padding-bottom: 40px;
}
.foot-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  align-items: flex-start;
}
.foot-brand { max-width: 300px; }
.foot-brand p {
  font-size: 16px;
  color: var(--ink-soft);
  margin-top: 12px;
}
.foot-cols { display: flex; gap: 64px; flex-wrap: wrap; }
.foot-col h4 {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.foot-col a {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--ink-soft);
  text-decoration: none;
  padding: 3.5px 0;
}
.foot-col a:hover { color: var(--teal-ink); }
.foot-base {
  margin-top: 44px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: space-between;
}

/* ---------- prose pages (privacy / terms / support / blog) ---------- */

.page-head { padding: 84px 0 30px; }
.page-head .display { font-size: clamp(40px, 6vw, 58px); max-width: 16ch; }
.page-head .lede { margin-top: 18px; max-width: var(--measure); }

.prose { max-width: var(--measure); padding-bottom: 30px; }
.prose h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 27px;
  margin: 52px 0 14px;
  line-height: 1.2;
}
.prose h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 20px;
  margin: 34px 0 10px;
}
.prose p { margin: 14px 0; color: var(--ink); }
.prose p.soft, .prose li.soft { color: var(--ink-soft); }
.prose ul, .prose ol { margin: 14px 0 14px 26px; }
.prose li { margin: 7px 0; }
.prose a { color: var(--teal-ink); text-underline-offset: 3px; }
.prose strong { font-weight: 600; }
.prose .mono-note { display: block; margin: 26px 0; }
.prose hr { border: none; border-top: 1px solid var(--rule); margin: 40px 0; }

.callout {
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 20px 24px;
  margin: 26px 0;
  color: var(--ink-soft);
}
.callout.green {
  background: color-mix(in srgb, var(--grade-a-bg) 40%, var(--paper));
  border-color: color-mix(in srgb, var(--grade-a-badge) 28%, var(--rule));
  color: var(--grade-a-ink);
}

/* ---------- blog index ---------- */

.post-list { max-width: 720px; }
.post-card {
  display: block;
  text-decoration: none;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
  padding: 28px 30px;
  margin-bottom: 18px;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.post-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(26,26,26,0.07);
  border-color: color-mix(in srgb, var(--teal) 40%, var(--rule));
}
.post-card h3 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 26px;
  margin: 10px 0 8px;
}
.post-card p { color: var(--ink-soft); font-size: 17.5px; }