/* ==========================================================================
   RationalBit — Apple-native design system
   Zero webfonts (system stack = instant text render, best LCP).
   Light + dark, both first-class.
   ========================================================================== */

/* --- Tokens ------------------------------------------------------------- */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
               "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --bg:        #ffffff;
  --bg-sunken: #f5f5f7;
  --bg-raised: #ffffff;
  --bg-invert: #1d1d1f;
  --text:      #1d1d1f;
  --text-mute: #6e6e73;
  --text-fade: #86868b;
  --text-invert: #f5f5f7;
  --line:      rgba(0, 0, 0, .10);
  --line-soft: rgba(0, 0, 0, .06);
  --accent:    #0071e3;
  --accent-ink:#ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.05);
  --shadow-md: 0 2px 6px rgba(0,0,0,.05), 0 12px 32px rgba(0,0,0,.08);
  --shadow-lg: 0 4px 12px rgba(0,0,0,.06), 0 24px 60px rgba(0,0,0,.12);
  --nav-bg:    rgba(255, 255, 255, .72);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 22px;
  --r-xl: 30px;

  --gutter: clamp(20px, 5vw, 32px);
  --max: 1120px;
  --max-prose: 720px;
  --section-y: clamp(72px, 11vw, 140px);

  --ease: cubic-bezier(.4, 0, .2, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #000000;
    --bg-sunken: #0e0e10;
    --bg-raised: #1a1a1c;
    --bg-invert: #f5f5f7;
    --text:      #f5f5f7;
    --text-mute: #a1a1a6;
    --text-fade: #86868b;
    --text-invert: #1d1d1f;
    --line:      rgba(255, 255, 255, .14);
    --line-soft: rgba(255, 255, 255, .08);
    --accent:    #2997ff;
    --accent-ink:#ffffff;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.5);
    --shadow-md: 0 12px 32px rgba(0,0,0,.6);
    --shadow-lg: 0 24px 60px rgba(0,0,0,.7);
    --nav-bg:    rgba(0, 0, 0, .72);
  }
}

/* --- Reset -------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
  position: fixed; top: -100px; left: 50%; transform: translateX(-50%);
  z-index: 200; padding: 12px 22px; border-radius: 0 0 12px 12px;
  background: var(--accent); color: #fff; font-weight: 600;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 0; }

/* --- Layout ------------------------------------------------------------- */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
.prose-wrap { width: 100%; max-width: var(--max-prose); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--section-y); }
.section--sunken { background: var(--bg-sunken); }
.section--tint { background: var(--app-tint, var(--bg-sunken)); }

/* --- Type --------------------------------------------------------------- */
.display {
  font-size: clamp(2.5rem, 6.2vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -.035em;
  font-weight: 700;
  text-wrap: balance;
}
.h2 {
  font-size: clamp(1.9rem, 3.8vw, 3rem);
  line-height: 1.1;
  letter-spacing: -.028em;
  font-weight: 700;
  text-wrap: balance;
}
.h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  line-height: 1.25;
  letter-spacing: -.02em;
  font-weight: 600;
}
.lede {
  font-size: clamp(1.125rem, 1.8vw, 1.4rem);
  line-height: 1.5;
  color: var(--text-mute);
  letter-spacing: -.012em;
  text-wrap: pretty;
}
.eyebrow {
  font-size: .8125rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--app-accent, var(--accent));
}
.muted { color: var(--text-mute); }
.center { text-align: center; }
.section-head { max-width: 760px; margin-inline: auto; text-align: center; margin-bottom: clamp(40px, 6vw, 72px); }
.section-head .lede { margin-top: 18px; }

/* --- Buttons ------------------------------------------------------------ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 14px 26px;
  border-radius: 980px;
  border: 1px solid transparent;
  font-size: 1.0125rem;
  font-weight: 600;
  letter-spacing: -.01em;
  cursor: pointer;
  white-space: nowrap;
  transition: transform .2s var(--ease), background .2s var(--ease), opacity .2s var(--ease);
}
.btn:active { transform: scale(.97); }
.btn--primary {
  background: var(--app-accent, var(--accent));
  color: #fff;
}
.btn--primary:hover { opacity: .88; }
.btn--secondary {
  background: transparent;
  color: var(--app-accent, var(--accent));
  border-color: currentColor;
}
.btn--secondary:hover { background: var(--app-tint, rgba(0,113,227,.08)); }
.btn--ghost { color: var(--app-accent, var(--accent)); padding: 8px 0; }
.btn--ghost:hover { text-decoration: underline; text-underline-offset: 4px; }
.btn--lg { padding: 17px 34px; font-size: 1.075rem; }
.btn svg { flex: none; }

.btn-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.btn-row--center { justify-content: center; }

/* Apple-style App Store badge */
.appstore {
  display: inline-flex; align-items: center; gap: 11px;
  padding: 11px 20px 11px 18px;
  border-radius: 14px;
  background: var(--bg-invert);
  color: var(--text-invert);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.appstore:hover { opacity: .85; }
.appstore:active { transform: scale(.97); }
.appstore svg { width: 26px; height: 26px; flex: none; }
.appstore__txt { display: flex; flex-direction: column; line-height: 1.15; text-align: left; }
.appstore__sm { font-size: .6875rem; letter-spacing: .01em; opacity: .8; }
.appstore__lg { font-size: 1.075rem; font-weight: 600; letter-spacing: -.02em; }

/* --- Nav ---------------------------------------------------------------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line-soft);
}
.nav__in {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  height: 56px;
  max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter);
}
.nav__brand { display: flex; align-items: center; gap: 9px; font-weight: 600; letter-spacing: -.02em; }
.nav__brand img { width: 26px; height: 26px; }
.nav__links { display: flex; align-items: center; gap: 30px; list-style: none; padding: 0; }
.nav__links a {
  font-size: .875rem; color: var(--text-mute);
  transition: color .18s var(--ease);
}
.nav__links a:hover, .nav__links a[aria-current="page"] { color: var(--text); }
.nav__cta { display: flex; align-items: center; gap: 16px; }
.nav__cta .btn { padding: 8px 18px; font-size: .875rem; }

.nav__burger {
  display: none; width: 40px; height: 40px; padding: 0;
  background: none; border: 0; cursor: pointer;
  align-items: center; justify-content: center;
}
.nav__burger span {
  display: block; width: 18px; height: 1.5px; background: var(--text);
  position: relative; transition: transform .3s var(--ease), opacity .2s var(--ease);
}
.nav__burger span::before, .nav__burger span::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 1.5px; background: var(--text);
  transition: transform .3s var(--ease);
}
.nav__burger span::before { top: -6px; }
.nav__burger span::after  { top: 6px; }
.nav__burger[aria-expanded="true"] span { background: transparent; }
.nav__burger[aria-expanded="true"] span::before { transform: translateY(6px) rotate(45deg); }
.nav__burger[aria-expanded="true"] span::after  { transform: translateY(-6px) rotate(-45deg); }

@media (max-width: 820px) {
  .nav__burger { display: flex; }
  .nav__panel {
    position: fixed; inset: 56px 0 auto 0;
    background: var(--nav-bg);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--line);
    padding: 8px var(--gutter) 26px;
    display: grid; gap: 4px;
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity .22s var(--ease), transform .22s var(--ease);
  }
  .nav__panel[data-open="true"] { transform: none; opacity: 1; pointer-events: auto; }
  .nav__links { flex-direction: column; align-items: stretch; gap: 0; }
  .nav__links a {
    display: block; padding: 15px 0; font-size: 1.0625rem; color: var(--text);
    border-bottom: 1px solid var(--line-soft);
  }
  .nav__cta { margin-top: 20px; }
  .nav__cta .btn { width: 100%; padding: 14px; font-size: 1rem; }
  .nav > .nav__in > .nav__panel { display: none; }
}
@media (min-width: 821px) {
  .nav__panel { display: contents; }
}

/* --- Hero --------------------------------------------------------------- */
.hero { position: relative; padding-block: clamp(64px, 10vw, 120px) clamp(56px, 8vw, 96px); overflow: hidden; }
.hero::before {
  content: ""; position: absolute; inset: -30% 0 auto; height: 620px; z-index: -1;
  background: radial-gradient(ellipse 60% 50% at 50% 40%, var(--app-tint, rgba(0,113,227,.10)), transparent 70%);
  pointer-events: none;
}
.hero__in { max-width: 860px; margin-inline: auto; text-align: center; }
.hero__icon {
  width: 104px; height: 104px; border-radius: 23%;
  margin: 0 auto 30px;
  box-shadow: var(--shadow-md);
}
.hero .display { margin-bottom: 22px; }
.hero .lede { max-width: 660px; margin-inline: auto; }
.hero .btn-row { margin-top: 36px; }
.hero__meta {
  margin-top: 26px; font-size: .8125rem; color: var(--text-fade);
  display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: center;
}
.hero__meta span { display: inline-flex; align-items: center; gap: 6px; }

/* Brand gradient text (RationalBit spectrum, from the logo) */
.grad {
  background: linear-gradient(100deg, #E8B93C 0%, #6FBF5E 22%, #35C6D4 44%, #3B7BD6 66%, #8B54C4 86%, #E06A4E 100%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

/* --- App cards (home) --------------------------------------------------- */
.apps { display: grid; gap: clamp(24px, 3vw, 34px); }
.appcard {
  --app-accent: var(--accent);
  position: relative;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(28px, 4vw, 60px);
  align-items: center;
  padding: clamp(30px, 4vw, 56px);
  border-radius: var(--r-xl);
  background: var(--bg-raised);
  border: 1px solid var(--line-soft);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow .35s var(--ease), transform .35s var(--ease);
}
.appcard:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.appcard::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(ellipse 70% 90% at 88% 15%, var(--app-tint), transparent 65%);
  pointer-events: none;
}
.appcard > * { position: relative; z-index: 1; }
.appcard:nth-child(even) { grid-template-columns: .95fr 1.05fr; }
.appcard:nth-child(even) .appcard__body { order: 2; }
.appcard:nth-child(even) .appcard__shots { order: 1; }

.appcard__head { display: flex; align-items: center; gap: 16px; margin-bottom: 20px; }
.appcard__icon { width: 62px; height: 62px; border-radius: 23%; box-shadow: var(--shadow-sm); flex: none; }
.appcard__name { font-size: 1.5rem; font-weight: 700; letter-spacing: -.025em; }
.appcard__cat { font-size: .8125rem; color: var(--text-fade); }
.appcard__tag {
  font-size: clamp(1.35rem, 2.2vw, 1.75rem); font-weight: 700;
  letter-spacing: -.025em; line-height: 1.2; margin-bottom: 14px; text-wrap: balance;
}
.appcard__desc { color: var(--text-mute); margin-bottom: 22px; }
.appcard__feats { list-style: none; padding: 0; margin: 0 0 26px; display: grid; gap: 11px; }
.appcard__feats li { display: flex; gap: 11px; align-items: flex-start; font-size: .9375rem; line-height: 1.5; }
.appcard__feats svg { flex: none; margin-top: 3px; color: var(--app-accent); }

.appcard__shots { display: flex; gap: 14px; justify-content: center; }
.appcard__shots img {
  width: clamp(96px, 13vw, 150px);
  border-radius: 14px;
  box-shadow: var(--shadow-md);
  transition: transform .4s var(--ease);
}
.appcard__shots img:nth-child(1) { transform: rotate(-3deg) translateY(6px); }
.appcard__shots img:nth-child(3) { transform: rotate(3deg) translateY(6px); }
.appcard:hover .appcard__shots img:nth-child(1) { transform: rotate(-4deg) translateY(0); }
.appcard:hover .appcard__shots img:nth-child(2) { transform: translateY(-6px); }
.appcard:hover .appcard__shots img:nth-child(3) { transform: rotate(4deg) translateY(0); }

@media (max-width: 900px) {
  .appcard, .appcard:nth-child(even) { grid-template-columns: 1fr; }
  .appcard:nth-child(even) .appcard__body { order: 1; }
  .appcard:nth-child(even) .appcard__shots { order: 2; }
  .appcard__shots img:nth-child(3) { display: none; }
}

/* --- Pillars ------------------------------------------------------------ */
.pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: clamp(20px, 2.6vw, 30px); }
.pillar {
  padding: 30px;
  border-radius: var(--r-lg);
  background: var(--bg-raised);
  border: 1px solid var(--line-soft);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.pillar:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.pillar__ico {
  width: 44px; height: 44px; border-radius: 12px;
  display: grid; place-items: center; margin-bottom: 18px;
  background: var(--app-tint, rgba(0,113,227,.1));
  color: var(--app-accent, var(--accent));
}
.pillar h3 { font-size: 1.0625rem; font-weight: 600; letter-spacing: -.015em; margin-bottom: 8px; }
.pillar p { font-size: .9375rem; color: var(--text-mute); line-height: 1.55; }

/* --- Screenshots carousel ----------------------------------------------- */
.shots {
  display: flex; gap: clamp(16px, 2.4vw, 28px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 8px calc(50vw - var(--max) / 2 + var(--gutter)) 28px;
  scrollbar-width: none;
}
.shots::-webkit-scrollbar { display: none; }
@media (max-width: 1184px) { .shots { padding-inline: var(--gutter); } }
.shot { flex: none; width: clamp(210px, 26vw, 270px); scroll-snap-align: center; }
.shot img {
  width: 100%; border-radius: 20px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--line-soft);
}
.shot figcaption {
  margin-top: 16px; font-size: .875rem; line-height: 1.5;
  color: var(--text-mute); text-wrap: pretty;
}
.shots-hint {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: .8125rem; color: var(--text-fade); margin-top: 4px;
}

/* --- How it works ------------------------------------------------------- */
.steps { display: grid; gap: 0; max-width: 820px; margin-inline: auto; }
.step {
  display: grid; grid-template-columns: 56px 1fr; gap: 24px;
  padding: 32px 0;
  border-top: 1px solid var(--line-soft);
}
.step:last-child { border-bottom: 1px solid var(--line-soft); }
.step__n {
  width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center;
  font-size: .9375rem; font-weight: 600;
  background: var(--app-accent, var(--accent)); color: #fff;
}
.step h3 { font-size: 1.25rem; font-weight: 600; letter-spacing: -.02em; margin-bottom: 10px; }
.step p { color: var(--text-mute); }
.step .btn--ghost { margin-top: 12px; font-size: .9375rem; }
@media (max-width: 600px) {
  .step { grid-template-columns: 1fr; gap: 14px; }
}

/* --- Guides grid -------------------------------------------------------- */
.guides { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: clamp(20px, 2.5vw, 28px); }
.guide-card {
  display: flex; flex-direction: column;
  padding: 30px;
  border-radius: var(--r-lg);
  background: var(--bg-raised);
  border: 1px solid var(--line-soft);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--app-accent, var(--accent));
}
.guide-card__kicker {
  font-size: .75rem; font-weight: 600; letter-spacing: .06em; text-transform: uppercase;
  color: var(--app-accent, var(--accent)); margin-bottom: 12px;
}
.guide-card h3 { font-size: 1.1875rem; font-weight: 600; letter-spacing: -.02em; line-height: 1.3; margin-bottom: 10px; }
.guide-card p { font-size: .9375rem; color: var(--text-mute); line-height: 1.55; flex: 1; }
.guide-card__more {
  margin-top: 20px; font-size: .9375rem; font-weight: 600;
  color: var(--app-accent, var(--accent));
  display: inline-flex; align-items: center; gap: 6px;
}
.guide-card:hover .guide-card__more svg { transform: translateX(3px); }
.guide-card__more svg { transition: transform .25s var(--ease); }

/* --- FAQ ---------------------------------------------------------------- */
.faq { max-width: 820px; margin-inline: auto; }
.faq details {
  border-bottom: 1px solid var(--line-soft);
}
.faq details:first-child { border-top: 1px solid var(--line-soft); }
.faq summary {
  display: flex; align-items: flex-start; justify-content: space-between; gap: 20px;
  padding: 26px 0;
  cursor: pointer;
  list-style: none;
  font-size: 1.125rem; font-weight: 600; letter-spacing: -.018em; line-height: 1.4;
  transition: color .2s var(--ease);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--app-accent, var(--accent)); }
.faq summary::after {
  content: ""; flex: none; width: 13px; height: 13px; margin-top: 7px;
  border-right: 2px solid var(--text-fade); border-bottom: 2px solid var(--text-fade);
  transform: rotate(45deg); transition: transform .3s var(--ease);
}
.faq details[open] summary::after { transform: rotate(-135deg); }
.faq__a { padding-bottom: 28px; color: var(--text-mute); max-width: 660px; }
.faq__a p + .btn--ghost { margin-top: 14px; }
.faq details[open] .faq__a { animation: fade-up .35s var(--ease); }
@keyframes fade-up { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

/* --- CTA band ----------------------------------------------------------- */
.cta {
  position: relative;
  padding: clamp(56px, 8vw, 96px) clamp(28px, 5vw, 72px);
  border-radius: var(--r-xl);
  background: var(--bg-invert);
  color: var(--text-invert);
  text-align: center;
  overflow: hidden;
}
.cta::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 100% at 50% 0%, var(--app-tint, rgba(0,113,227,.22)), transparent 70%);
}
.cta > * { position: relative; }
.cta .h2 { margin-bottom: 18px; }
.cta p { color: color-mix(in srgb, var(--text-invert) 65%, transparent); max-width: 560px; margin-inline: auto; font-size: 1.0625rem; }
.cta .btn-row { margin-top: 34px; }
.cta .appstore { background: var(--bg); color: var(--text); }
.cta .btn--secondary { color: var(--text-invert); border-color: color-mix(in srgb, var(--text-invert) 30%, transparent); }
.cta .btn--secondary:hover { background: color-mix(in srgb, var(--text-invert) 10%, transparent); }
.cta__note { margin-top: 22px; font-size: .8125rem; color: color-mix(in srgb, var(--text-invert) 45%, transparent); }

/* --- Inline CTA (inside guides) ----------------------------------------- */
.inline-cta {
  margin: 44px 0;
  padding: 32px;
  border-radius: var(--r-lg);
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  display: grid; grid-template-columns: 64px 1fr; gap: 22px; align-items: center;
}
.inline-cta img { width: 64px; height: 64px; border-radius: 23%; box-shadow: var(--shadow-sm); }
.inline-cta h3 { font-size: 1.125rem; font-weight: 600; letter-spacing: -.02em; margin-bottom: 6px; }
.inline-cta p { font-size: .9375rem; color: var(--text-mute); margin-bottom: 16px; line-height: 1.55; }
.inline-cta .btn-row { gap: 10px; }
@media (max-width: 560px) {
  .inline-cta { grid-template-columns: 1fr; }
}

/* --- Article / prose ---------------------------------------------------- */
.article { padding-block: clamp(36px, 5vw, 56px) clamp(64px, 8vw, 96px); }
.article__head { margin-bottom: clamp(36px, 5vw, 52px); }
.article__head h1 {
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  line-height: 1.1; letter-spacing: -.03em; font-weight: 700;
  margin-bottom: 20px; text-wrap: balance;
}
.article__meta {
  display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center;
  font-size: .8125rem; color: var(--text-fade);
  padding-top: 20px; border-top: 1px solid var(--line-soft);
}

.crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: .8125rem; color: var(--text-fade); margin-bottom: 22px; }
.crumbs a { color: var(--text-fade); }
.crumbs a:hover { color: var(--text); }
.crumbs li { list-style: none; display: flex; gap: 8px; align-items: center; }
.crumbs li::after { content: "/"; color: var(--line); }
.crumbs li:last-child::after { display: none; }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }

.prose { font-size: 1.0625rem; line-height: 1.72; }
.prose > * + * { margin-top: 1.35em; }
.prose h2 {
  font-size: clamp(1.5rem, 2.6vw, 1.95rem);
  line-height: 1.25; letter-spacing: -.024em; font-weight: 700;
  margin-top: 2.4em; margin-bottom: .1em; scroll-margin-top: 90px;
  text-wrap: balance;
}
.prose h3 {
  font-size: 1.1875rem; font-weight: 600; letter-spacing: -.018em;
  margin-top: 1.9em; margin-bottom: .1em; scroll-margin-top: 90px;
}
.prose p { color: var(--text); text-wrap: pretty; }
.prose strong { font-weight: 600; }
.prose a {
  color: var(--app-accent, var(--accent));
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--app-accent, var(--accent)) 35%, transparent);
  text-underline-offset: 3px;
  transition: text-decoration-color .2s var(--ease);
}
.prose a:hover { text-decoration-color: currentColor; }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li + li { margin-top: .55em; }
.prose li::marker { color: var(--text-fade); }
.prose blockquote {
  border-left: 3px solid var(--app-accent, var(--accent));
  padding: 4px 0 4px 22px;
  color: var(--text-mute);
  font-size: 1.0625rem;
}
.prose code {
  font-family: var(--font-mono); font-size: .875em;
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  padding: .12em .38em; border-radius: 5px;
}
.prose pre {
  background: var(--bg-sunken);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  padding: 20px;
  overflow-x: auto;
  font-size: .8125rem; line-height: 1.6;
}
.prose pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.prose hr { border: 0; border-top: 1px solid var(--line-soft); margin: 2.6em 0; }

.table-scroll { overflow-x: auto; margin-top: 1.35em; }
.prose table { width: 100%; border-collapse: collapse; font-size: .9375rem; }
.prose th, .prose td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line-soft); vertical-align: top; }
.prose th { font-weight: 600; font-size: .8125rem; text-transform: uppercase; letter-spacing: .05em; color: var(--text-fade); white-space: nowrap; }
.prose tbody tr:last-child td { border-bottom: 0; }

/* Key-takeaway box at the top of a guide */
.tldr {
  padding: 26px 30px;
  border-radius: var(--r-md);
  background: var(--app-tint, var(--bg-sunken));
  border: 1px solid var(--line-soft);
  margin-bottom: 12px;
}
.tldr h2 {
  font-size: .75rem !important; font-weight: 600; letter-spacing: .07em; text-transform: uppercase;
  color: var(--app-accent, var(--accent)); margin: 0 0 10px !important;
}
.tldr p { font-size: 1.0625rem; line-height: 1.6; margin: 0; }

/* Table of contents */
.toc {
  padding: 24px 28px; border-radius: var(--r-md);
  background: var(--bg-sunken); border: 1px solid var(--line-soft);
}
.toc h2 {
  font-size: .75rem !important; font-weight: 600; letter-spacing: .07em; text-transform: uppercase;
  color: var(--text-fade); margin: 0 0 14px !important;
}
.toc ol { list-style: none; padding: 0; margin: 0; counter-reset: toc; }
.toc li { counter-increment: toc; margin: 0 0 9px; padding-left: 26px; position: relative; font-size: .9375rem; }
.toc li::before { content: counter(toc); position: absolute; left: 0; color: var(--text-fade); font-variant-numeric: tabular-nums; }
.toc a { color: var(--text-mute); }
.toc a:hover { color: var(--app-accent, var(--accent)); }

/* Related guides */
.related { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px; }
.related a {
  padding: 22px 24px; border-radius: var(--r-md);
  background: var(--bg-raised); border: 1px solid var(--line-soft);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.related a:hover { border-color: var(--app-accent, var(--accent)); transform: translateY(-2px); }
.related span { font-size: .75rem; text-transform: uppercase; letter-spacing: .06em; color: var(--text-fade); }
.related h3 { font-size: 1rem; font-weight: 600; letter-spacing: -.015em; line-height: 1.35; margin-top: 8px; }

/* --- Footer ------------------------------------------------------------- */
.footer { border-top: 1px solid var(--line-soft); padding-block: 56px 40px; background: var(--bg-sunken); }
.footer__grid {
  display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid var(--line-soft);
}
@media (max-width: 800px) { .footer__grid { grid-template-columns: 1fr 1fr; gap: 32px; } }
@media (max-width: 480px) { .footer__grid { grid-template-columns: 1fr; } }
.footer__brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -.02em; margin-bottom: 12px; }
.footer__brand img { width: 28px; height: 28px; }
.footer__blurb { font-size: .875rem; color: var(--text-mute); max-width: 300px; line-height: 1.6; }
.footer h4 { font-size: .8125rem; font-weight: 600; margin-bottom: 14px; letter-spacing: -.005em; }
.footer ul { list-style: none; padding: 0; display: grid; gap: 10px; }
.footer ul a { font-size: .875rem; color: var(--text-mute); transition: color .2s var(--ease); }
.footer ul a:hover { color: var(--text); }
.footer__bottom {
  display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: space-between;
  padding-top: 28px; font-size: .8125rem; color: var(--text-fade);
}
.footer__social { display: flex; gap: 8px; }
.footer__social a {
  width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center;
  color: var(--text-mute);
  border: 1px solid var(--line-soft);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer__social a:hover { color: var(--text); border-color: var(--text-mute); }
.footer__social svg { width: 15px; height: 15px; }

/* --- Scroll reveal ------------------------------------------------------ */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal:nth-child(2) { transition-delay: .07s; }
.reveal:nth-child(3) { transition-delay: .14s; }
.reveal:nth-child(4) { transition-delay: .21s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* --- Legal / support pages ---------------------------------------------- */
.legal { padding-block: clamp(40px, 6vw, 72px) clamp(64px, 9vw, 110px); }
.legal h1 { font-size: clamp(2rem, 4vw, 2.75rem); letter-spacing: -.03em; font-weight: 700; line-height: 1.1; }
.legal .lede { margin-top: 14px; margin-bottom: 40px; }

.portrait {
  width: 132px; height: 132px; border-radius: 50%;
  object-fit: cover; margin-bottom: 28px;
  box-shadow: var(--shadow-md);
}

/* --- 404 ---------------------------------------------------------------- */
.notfound { min-height: 62vh; display: grid; place-items: center; text-align: center; padding-block: 80px; }