/* ── Landing page intro + FAQ sections (dark theme, matches calculator) ── */

.landing-intro {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 32px 8px;
}
.landing-breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-faint);
  margin-bottom: 24px;
  letter-spacing: 0.03em;
}
.landing-breadcrumb a {
  color: var(--text-faint);
  text-decoration: none;
}
.landing-breadcrumb a:hover { color: var(--text-dim); }
.landing-breadcrumb .sep { margin: 0 6px; opacity: 0.5; }

.landing-intro h1 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--text);
  margin: 0 0 20px;
}
.landing-intro p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dim);
  margin: 0 0 16px;
}
.landing-intro a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}
.landing-intro a:hover { border-bottom-color: var(--accent); }

/* ── Noscript placeholder ── */
.noscript-box {
  max-width: 800px;
  margin: 32px auto;
  padding: 40px 32px;
  text-align: center;
  border: 1px dashed var(--border-strong);
  border-radius: 12px;
  color: var(--text-dim);
  font-size: 15px;
}

/* ── FAQ section ── */
.landing-faq {
  max-width: 800px;
  margin: 0 auto;
  padding: 48px 32px 16px;
}
.landing-faq h2 {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
  margin: 0 0 20px;
}
.landing-faq details {
  border-bottom: 1px solid var(--border);
}
.landing-faq details:first-of-type {
  border-top: 1px solid var(--border);
}
.landing-faq summary {
  padding: 16px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.landing-faq summary::-webkit-details-marker { display: none; }
.landing-faq summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 400;
  color: var(--text-faint);
  flex-shrink: 0;
  transition: transform 200ms;
}
.landing-faq details[open] summary::after {
  content: "−";
}
.landing-faq .faq-answer {
  padding: 0 0 16px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--text-dim);
}
.landing-faq .faq-answer code {
  font-family: var(--font-mono);
  font-size: 13px;
  background: var(--bg-elev);
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

/* ── Related calculators ── */
.landing-related {
  max-width: 800px;
  margin: 0 auto;
  padding: 32px 32px 48px;
}
.landing-related h3 {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-faint);
  font-weight: 500;
  margin: 0 0 14px;
}
.landing-related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.landing-related-grid a {
  display: block;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-raised);
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: border-color 160ms;
}
.landing-related-grid a:hover { border-color: var(--border-strong); }
.landing-related-grid .related-sub {
  display: block;
  font-size: 12px;
  color: var(--text-faint);
  font-weight: 400;
  margin-top: 4px;
}

/* ── Responsive ── */
@media (max-width: 640px) {
  .landing-intro { padding: 32px 20px 8px; }
  .landing-intro h1 { font-size: 26px; }
  .landing-faq { padding: 36px 20px 12px; }
  .landing-related { padding: 24px 20px 40px; }
}