/* Optimize — guides / SEO content layer.
   Lives under guides/ so the design refresh (which copies top-level site/* only)
   never clobbers it. Builds on the shared design tokens from ../styles.css. */

/* ── Breadcrumb ── */
.breadcrumb {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--ink-dim); }
.breadcrumb a:hover { color: var(--ink-strong); }
.breadcrumb .sep { opacity: 0.5; }

/* ── Hub grid ── */
.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  padding: clamp(32px, 5vw, 64px) 0;
}
@media (max-width: 720px) { .guide-grid { grid-template-columns: 1fr; } }

.guide-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color 0.18s, transform 0.18s;
}
.guide-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.guide-card .tag {
  align-self: flex-start;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 999px;
}
.guide-card h3 {
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink-strong);
  line-height: 1.2;
}
.guide-card p { color: var(--ink-dim); font-size: 15px; line-height: 1.55; }
.guide-card .read-on {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent);
}

/* ── Long-form prose ── */
.prose { max-width: 68ch; }
.prose > * + * { margin-top: 18px; }
.prose h2 {
  font-size: clamp(24px, 3vw, 30px);
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--ink-strong);
  line-height: 1.2;
  margin-top: 44px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hairline);
}
.prose h3 {
  font-size: 19px;
  font-weight: 600;
  color: var(--ink-strong);
  margin-top: 28px;
}
.prose p { color: var(--ink-dim); font-size: 16px; line-height: 1.7; }
.prose ul, .prose ol { color: var(--ink-dim); font-size: 16px; line-height: 1.7; padding-left: 22px; display: flex; flex-direction: column; gap: 8px; }
.prose li::marker { color: var(--ink-faint); }
.prose strong { color: var(--ink-strong); font-weight: 600; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--chip, var(--accent-soft));
  padding: 2px 6px;
  border-radius: 6px;
  color: var(--ink-strong);
}

.disclaimer {
  margin-top: 36px;
  padding: 18px 20px;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  background: var(--surface-alt, var(--surface));
}
.disclaimer p { font-size: 14px; color: var(--ink-dim); line-height: 1.6; }
.disclaimer strong { color: var(--ink-strong); }

/* ── Reconstitution calculator widget ── */
.calc {
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  background: var(--surface);
  padding: clamp(22px, 4vw, 36px);
  margin: 8px 0 12px;
}
.calc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}
@media (max-width: 560px) { .calc-grid { grid-template-columns: 1fr; } }

.calc-field { display: flex; flex-direction: column; gap: 7px; }
.calc-field label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.calc-field input, .calc-field select {
  font: inherit;
  font-size: 16px;
  color: var(--ink-strong);
  background: var(--bg);
  border: 1px solid var(--hairline-strong, var(--hairline));
  border-radius: 10px;
  padding: 11px 13px;
  width: 100%;
  -webkit-appearance: none;
  appearance: none;
}
.calc-field input:focus, .calc-field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.calc-field .hint { font-size: 12px; color: var(--ink-faint); }

.calc-result {
  margin-top: 24px;
  padding: 22px 24px;
  border-radius: 14px;
  background: var(--accent-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
}
.calc-result .big {
  font-size: clamp(34px, 6vw, 48px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  font-family: var(--mono);
  line-height: 1;
}
.calc-result .unit-label { font-size: 15px; color: var(--ink-dim); }
.calc-result .secondary {
  width: 100%;
  font-size: 14px;
  color: var(--ink-dim);
  margin-top: 4px;
}
.calc-result.error .big { font-size: 18px; font-family: var(--serif); font-style: italic; }
.calc-result.error { background: var(--surface-alt, var(--surface)); border: 1px solid var(--hairline); }

/* ── Comparison table ── */
.cmp-wrap { overflow-x: auto; margin: 8px 0; }
.cmp-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  min-width: 540px;
}
.cmp-table th, .cmp-table td {
  text-align: left;
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline);
  vertical-align: top;
}
.cmp-table thead th {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
  border-bottom: 1px solid var(--hairline-strong, var(--hairline));
}
.cmp-table thead th.us { color: var(--accent); }
.cmp-table tbody th {
  font-weight: 600;
  color: var(--ink-strong);
  width: 34%;
}
.cmp-table td { color: var(--ink-dim); }
.cmp-table td.us { color: var(--ink-strong); background: var(--accent-soft); }
.cmp-table .yes { color: var(--accent); font-weight: 600; }
.cmp-table .no { color: var(--ink-faint); }

/* ── Page hero tweaks reused across guides ── */
.guide-hero .lede { max-width: 64ch; }
.guide-body { padding: clamp(36px, 5vw, 72px) 0; }