/* Protocol 75 — transcribed from the app's Palette (OKLCH, dark-only). */
:root {
  --bg:            oklch(0.13 0.005 250);
  --surface:       oklch(0.16 0.006 250);
  --track:         oklch(0.25 0.008 250);
  --fg0:           oklch(0.98 0 0);
  --fg1:           oklch(0.78 0.005 250);
  --fg2:           oklch(0.58 0.006 250);
  --fg3:           oklch(0.42 0.006 250);
  --accent:        oklch(0.74 0.16 150);
  --accent-bright: oklch(0.82 0.14 150);
  --accent-soft:   oklch(0.74 0.16 150 / 0.18);
  --glow-accent:   oklch(0.74 0.16 150 / 0.10);
  --glow-blue:     oklch(0.68 0.17 278 / 0.07);
  --hairline:      rgb(255 255 255 / 0.10);
  --hairline-soft: rgb(255 255 255 / 0.08);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg1);
  font: 400 17px/1.65 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* The two ambient radial glows behind the canvas. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(60rem 40rem at 12% -10%, var(--glow-accent), transparent 60%),
    radial-gradient(50rem 40rem at 92% 8%,  var(--glow-blue),   transparent 60%);
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.5rem 6rem;
}

/* Header */
.masthead { padding: 5.5rem 0 0; }

.eyebrow {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 3.6rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--fg0);
}

.lede {
  margin: 1.25rem 0 0;
  font-size: 1.2rem;
  line-height: 1.55;
  color: var(--fg1);
  max-width: 34rem;
}

/* The rule that defines the app */
.rule-card {
  margin: 3rem 0 0;
  padding: 1.5rem 1.75rem;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--accent);
  border-radius: 14px;
}
.rule-card p { margin: 0; color: var(--fg1); }
.rule-card strong { color: var(--fg0); font-weight: 600; }

/* Sections */
section { margin-top: 4.5rem; }

h2 {
  margin: 0 0 1.75rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg2);
}

.features {
  display: grid;
  gap: 1px;
  background: var(--hairline-soft);
  border: 1px solid var(--hairline-soft);
  border-radius: 14px;
  overflow: hidden;
}
@media (min-width: 40rem) { .features { grid-template-columns: 1fr 1fr; } }

.feature { background: var(--bg); padding: 1.5rem 1.6rem; }
.feature h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg0);
}
.feature p { margin: 0; font-size: 0.95rem; line-height: 1.55; color: var(--fg2); }

/* Long-form copy (privacy / support) */
.prose h2 {
  margin: 2.75rem 0 0.85rem;
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--fg0);
}
.prose p, .prose li { color: var(--fg1); }
.prose ul { padding-left: 1.15rem; }
.prose li { margin: 0.4rem 0; }
.prose strong { color: var(--fg0); font-weight: 600; }
.updated { font-size: 0.9rem; color: var(--fg3); }

a { color: var(--accent-bright); text-decoration-color: var(--accent-soft); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }

/* Footer */
footer {
  margin-top: 5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--hairline-soft);
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  align-items: baseline;
  font-size: 0.9rem;
  color: var(--fg3);
}
footer nav { display: flex; gap: 1.5rem; }
footer .spacer { flex: 1; }

.back {
  display: inline-block;
  margin: 3rem 0 0;
  font-size: 0.9rem;
}