:root {
  --color-accent: #232946;
  --color-tertiary: #d9376e;
  --color-bg: #eff0f3;
  --color-surface: #fffffe;
  --color-headline: #0d0d0d;
  --color-paragraph: #2a2a2a;
  --color-muted: #6b6b80;
  --color-line: rgba(0, 0, 0, 0.08);
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
}
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 100%; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font);
  color: var(--color-paragraph);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 3px solid var(--color-tertiary); outline-offset: 2px; }
:focus:not(:focus-visible) { outline: none; }
img { max-width: 100%; height: auto; display: block; }

/* Nav */
.nav {
  background: rgba(255, 255, 254, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-block-end: 1px solid var(--color-line);
  padding-block: 0.75rem;
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav__inner {
  width: min(90%, 72rem);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.625rem;
}
.nav__brand { display: flex; align-items: center; gap: 0.625rem; }
.nav__logo { width: 40px; height: 40px; border-radius: 10px; }
.nav__name { font-size: 1.25rem; font-weight: 800; color: var(--color-headline); letter-spacing: -0.02em; }
.nav__cta {
  background: var(--color-accent);
  color: var(--color-surface);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.5rem 1.1rem;
  border-radius: 10px;
}
.nav__cta:hover { text-decoration: none; transform: translateY(-1px); }

.container { width: min(90%, 44rem); margin-inline: auto; }

/* Breadcrumb */
.breadcrumb { font-size: 0.8125rem; color: var(--color-muted); padding-block: 1.5rem 0; }
.breadcrumb a { color: var(--color-muted); }
.breadcrumb a:hover { color: var(--color-headline); }
.breadcrumb span[aria-current] { color: var(--color-headline); font-weight: 600; }

/* Article */
.article { padding-block: 1.5rem clamp(3rem, 8vw, 5rem); }
.article h1 {
  font-size: clamp(1.875rem, 1.2rem + 3vw, 2.75rem);
  font-weight: 800;
  color: var(--color-headline);
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin-block-end: 0.75rem;
}
.article__lead {
  font-size: 1.1875rem;
  color: var(--color-muted);
  margin-block-end: 1rem;
}
.article__meta { font-size: 0.8125rem; color: var(--color-muted); margin-block-end: 2.25rem; }
.article h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-headline);
  letter-spacing: -0.02em;
  margin-block: 2.5rem 0.9rem;
}
.article h3 {
  font-size: 1.1875rem;
  font-weight: 700;
  color: var(--color-headline);
  margin-block: 1.75rem 0.6rem;
}
.article p { margin-block-end: 1.1rem; }
.article ul, .article ol { margin-block-end: 1.1rem; padding-inline-start: 1.4rem; }
.article li { margin-block-end: 0.5rem; }
.article strong { color: var(--color-headline); font-weight: 600; }

/* Callout */
.callout {
  background: var(--color-surface);
  border-inline-start: 4px solid var(--color-tertiary);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-block: 1.75rem;
  box-shadow: var(--shadow-card);
  font-size: 0.9375rem;
}
.callout strong { display: block; margin-block-end: 0.25rem; }

/* Table */
.table-wrap { overflow-x: auto; margin-block: 1.5rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.9375rem; background: var(--color-surface); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-card); }
th, td { text-align: start; padding: 0.75rem 1rem; border-block-end: 1px solid var(--color-line); }
th { background: var(--color-accent); color: var(--color-surface); font-weight: 600; }
tr:last-child td { border-block-end: none; }

/* CTA card */
.cta-card {
  background: var(--color-accent);
  color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: clamp(1.75rem, 4vw, 2.5rem);
  margin-block: 2.5rem;
  text-align: center;
}
.cta-card h2 { color: var(--color-surface); margin-block: 0 0.5rem; }
.cta-card p { color: rgba(255, 255, 254, 0.8); margin-block-end: 1.5rem; }
.cta-card .app-store-badge { height: 52px; width: auto; margin-inline: auto; }

/* FAQ */
.faq h2 { margin-block-end: 1.25rem; }
.faq-item {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin-block-end: 0.75rem;
  box-shadow: var(--shadow-card);
}
.faq-item h3 { font-size: 1rem; font-weight: 600; color: var(--color-headline); margin-block: 0 0.375rem; }
.faq-item p { font-size: 0.9375rem; color: var(--color-muted); margin-block-end: 0; }

/* Related / hub grid */
.related { margin-block-start: 3rem; }
.related h2 { margin-block-end: 1.25rem; }
.guide-grid { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 40rem) { .guide-grid { grid-template-columns: 1fr 1fr; } }
.guide-card {
  display: block;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform 200ms ease-out, box-shadow 200ms ease-out;
}
.guide-card:hover { transform: translateY(-2px); box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08); text-decoration: none; }
.guide-card__eyebrow { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-tertiary); }
.guide-card h3 { font-size: 1.125rem; font-weight: 700; color: var(--color-headline); margin-block: 0.4rem 0.4rem; }
.guide-card p { font-size: 0.9375rem; color: var(--color-muted); margin-block-end: 0; }

/* Footer */
.footer { padding-block: 2rem; border-block-start: 1px solid var(--color-line); margin-block-start: 2rem; }
.footer__inner {
  width: min(90%, 72rem);
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--color-muted);
}
.footer__brand { display: flex; align-items: center; gap: 0.5rem; }
.footer__logo { width: 32px; height: 32px; border-radius: 8px; }
.footer__name { font-weight: 700; color: var(--color-headline); }
.footer__links { display: flex; flex-wrap: wrap; gap: 1.5rem; list-style: none; }
.footer__link { font-size: 0.8125rem; color: var(--color-muted); }
.footer__link:hover { color: var(--color-headline); }
@media (max-width: 48rem) { .footer__inner { flex-direction: column; text-align: center; } }