/* ─── Feature page layout ───────────────────────────────────────────── */
.feature-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 2rem 4rem;
}

.feature-hero {
  padding: 3.5rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.feature-icon-lg {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}

.feature-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 0.8rem;
}

.feature-lead {
  font-size: 1.1rem;
  color: var(--sub);
  line-height: 1.7;
  max-width: 580px;
}
.feature-lead code {
  font-size: 0.95em;
  color: var(--accent2);
}

/* ─── Body content ──────────────────────────────────────────────────── */
.feature-body h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 2.2rem 0 0.7rem;
}

.feature-body h3 {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--sub);
  margin: 2rem 0 0.8rem;
}

.feature-body p {
  color: var(--sub);
  font-size: 0.93rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.feature-body p strong { color: var(--text); }

.feature-body code {
  font-size: 0.85em;
  color: var(--accent2);
  background: var(--bg3);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

.feature-list {
  padding-left: 1.3rem;
  margin-bottom: 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.feature-list li {
  color: var(--sub);
  font-size: 0.92rem;
  line-height: 1.65;
}
.feature-list li strong { color: var(--text); }
.feature-list code { font-size: 0.82em; }

/* ─── Dimension cards ───────────────────────────────────────────────── */
.dim-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.dim-card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  transition: border-color 0.2s;
}
.dim-card:hover { border-color: var(--accent); }

.dim-name {
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.dim-weight {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent2);
  font-weight: 400;
}

.dim-card p {
  font-size: 0.82rem;
  margin-bottom: 0;
  line-height: 1.6;
}

/* ─── Formula block ─────────────────────────────────────────────────── */
.formula-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 1.2rem 1.4rem;
  margin: 1rem 0 1.5rem;
}
.formula {
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--accent2);
  margin-bottom: 0.6rem;
}
.formula-note {
  font-size: 0.8rem;
  color: var(--sub);
  line-height: 1.6;
}

/* ─── Confidence ranges ─────────────────────────────────────────────── */
.range-blocks {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin: 1rem 0 1.5rem;
}

.range-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  display: grid;
  grid-template-columns: 90px 120px 1fr;
  gap: 0.8rem 1.2rem;
  align-items: start;
}

.range-pct {
  font-family: var(--mono);
  font-size: 0.88rem;
  font-weight: 700;
  padding-top: 0.1rem;
}
.range-label {
  font-weight: 600;
  font-size: 0.88rem;
  padding-top: 0.1rem;
}

.range-block p { font-size: 0.83rem; margin: 0; }

.range-low    { border-left: 3px solid var(--sub); }
.range-mid    { border-left: 3px solid #4a9eff; }
.range-review { border-left: 3px solid var(--yellow); }
.range-high   { border-left: 3px solid var(--red); }

.range-low    .range-pct { color: var(--sub); }
.range-mid    .range-pct { color: #4a9eff; }
.range-review .range-pct { color: var(--yellow); }
.range-high   .range-pct { color: var(--red); }

/* ─── Three blocks (threshold philosophy) ───────────────────────────── */
.three-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1rem 0 2rem;
}

.three-block {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.4rem;
  text-align: center;
}

.three-num {
  font-family: var(--mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--accent2);
  margin-bottom: 0.3rem;
}
.three-label {
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
  color: var(--text);
}
.three-block p { font-size: 0.82rem; margin: 0; text-align: left; }

/* ─── Threshold table ───────────────────────────────────────────────── */
.threshold-table {
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  margin: 1rem 0 1.5rem;
}
.thresh-row {
  display: grid;
  grid-template-columns: 1fr 120px 1fr;
  gap: 1rem;
  padding: 0.75rem 1.2rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--sub);
}
.thresh-row:last-child { border-bottom: none; }
.thresh-row.header {
  background: var(--bg3);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--sub);
}
.thresh-row:not(.header):hover { background: var(--bg2); }
.thresh-val {
  font-family: var(--mono);
  font-weight: 700;
  color: var(--accent2);
}

/* ─── Navigation ────────────────────────────────────────────────────── */
.feature-nav {
  display: flex;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}

/* ─── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .range-block { grid-template-columns: 1fr; gap: 0.3rem; }
  .three-blocks { grid-template-columns: 1fr; }
  .thresh-row { grid-template-columns: 1fr 1fr; }
  .thresh-row span:last-child { grid-column: 1 / -1; }
  .dim-cards { grid-template-columns: 1fr; }
}