/* ============================================
   Stack Analysis — interactive coverage tool
   ============================================ */

.sa-page {
  max-width: 1480px;
  margin: 0 auto;
  padding: calc(var(--navbar-height) + var(--space-12)) var(--space-6) var(--space-20);
}

.sa-hero {
  text-align: center;
  margin-bottom: var(--space-10);
}

.sa-hero-eyebrow {
  display: inline-block;
  font-size: var(--text-small);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-4);
}

.sa-hero-title {
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-display);
  letter-spacing: var(--tracking-tight);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.sa-hero-subtitle {
  max-width: 720px;
  margin: 0 auto;
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--text-secondary);
}

/* ── Main layout: Your Stack | Coverage Map | Sample Stacks ── */
.sa-workspace {
  display: grid;
  grid-template-columns: 340px minmax(0, 1fr) 240px;
  gap: var(--space-6);
  align-items: start;
  margin-bottom: var(--space-10);
}

@media (max-width: 1200px) {
  .sa-workspace { grid-template-columns: 300px minmax(0, 1fr) 220px; }
}

@media (max-width: 960px) {
  .sa-workspace {
    grid-template-columns: 1fr 1fr;
  }
  .sa-col-chart { grid-column: 1 / -1; order: -1; }
}

@media (max-width: 640px) {
  .sa-workspace { grid-template-columns: 1fr; }
  .sa-col-chart { grid-column: auto; order: -1; }
}

/* ── SignumEssentials toggle above chart ── */
.sa-chart-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.sa-chart-topbar h2 {
  margin-bottom: 0;
}

.sa-signum-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-small);
  font-weight: var(--weight-semibold);
  color: var(--violet-700);
  background: var(--violet-50);
  border: 1.5px solid var(--violet-300);
  border-radius: var(--radius-full);
  cursor: pointer;
  font-family: var(--font-body);
  transition: all var(--transition-fast);
}

.sa-signum-toggle:hover {
  background: var(--violet-100);
  border-color: var(--violet-500);
}

.sa-signum-toggle.active {
  background: var(--accent-primary);
  color: var(--text-light);
  border-color: var(--accent-primary);
}

.sa-signum-toggle.active svg {
  transform: rotate(45deg);
}

.sa-signum-toggle svg {
  transition: transform var(--transition-fast);
}

/* ── Sample stack presets ── */
.sa-presets {
  display: grid;
  gap: var(--space-2);
}

.sa-preset {
  text-align: left;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--bg-soft);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}

.sa-preset:hover {
  border-color: var(--accent-primary);
  background: var(--violet-50);
}

.sa-preset-name {
  display: block;
  font-size: var(--text-small);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin-bottom: 2px;
}

.sa-preset-note {
  display: block;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  line-height: var(--leading-snug);
}

.sa-preset-tools {
  display: block;
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: var(--space-2);
  font-style: italic;
}

.sa-panel {
  background: var(--bg-pure);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-2xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
}

.sa-panel h2 {
  font-family: var(--font-display);
  font-size: var(--text-body-lg);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

.sa-panel h3 {
  font-family: var(--font-display);
  font-size: var(--text-body);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-3);
}

/* ── Controls ── */
.sa-control-group {
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-5);
  border-bottom: 1px solid var(--border-light);
}

.sa-control-group:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.sa-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

.sa-segmented {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-soft);
}

.sa-segmented button {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  color: var(--text-secondary);
  background: transparent;
  border: none;
  padding: var(--space-2) var(--space-2);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-right: 1px solid var(--border-light);
}

.sa-segmented button:last-child { border-right: none; }

.sa-segmented button.active {
  background: var(--accent-primary);
  color: var(--text-light);
}

.sa-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: var(--bg-pure);
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--text-primary);
  cursor: pointer;
}

.sa-select:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.sa-search-wrap {
  position: relative;
}

.sa-search {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: var(--text-small);
  color: var(--text-primary);
}

.sa-search:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

.sa-results {
  display: none;
  position: absolute;
  z-index: 20;
  left: 0; right: 0;
  top: calc(100% + 4px);
  max-height: 420px;
  overflow-y: auto;
  background: var(--bg-pure);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
}

.sa-results.visible { display: block; }

/* Results rows now have an Add / Remove action chip on the right. Already-
   in-stack rows get a subtle bg so the state reads at a glance. */
.sa-result-item {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-small);
  color: var(--text-primary);
  cursor: pointer;
  border-bottom: 1px solid var(--border-light);
}

.sa-result-item:last-child { border-bottom: none; }

.sa-result-item:hover {
  background: var(--violet-50);
  color: var(--violet-700);
}

.sa-result-item.is-in-stack {
  background: rgba(16, 185, 129, 0.04);
  cursor: default;
}
.sa-result-item.is-in-stack:hover { background: rgba(16, 185, 129, 0.06); }

.sa-result-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sa-result-item .sa-result-note {
  grid-column: 1;
  display: block;
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  margin-top: 2px;
}

.sa-result-action {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  padding: 3px var(--space-2);
  border-radius: var(--radius-full);
  white-space: nowrap;
  grid-row: 1 / span 2;
  grid-column: 2;
  align-self: center;
}
.sa-result-action--add {
  background: var(--violet-50);
  color: var(--violet-700);
  border: 1px solid var(--violet-200);
}
.sa-result-item:hover .sa-result-action--add {
  background: var(--violet-100);
  border-color: var(--violet-500);
}
.sa-result-action--remove {
  background: rgba(220, 38, 38, 0.08);
  color: var(--danger);
  border: 1px solid rgba(220, 38, 38, 0.25);
  cursor: pointer;
}
.sa-result-action--remove:hover {
  background: rgba(220, 38, 38, 0.14);
  border-color: rgba(220, 38, 38, 0.5);
}

.sa-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
  min-height: 24px;
}

.sa-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1-5) var(--space-3);
  background: var(--violet-100);
  color: var(--violet-700);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
}

.sa-chip button {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  padding: 0;
  opacity: 0.6;
}

.sa-chip button:hover { opacity: 1; }

.sa-empty {
  font-size: var(--text-small);
  color: var(--text-tertiary);
  font-style: italic;
  padding: var(--space-2) 0;
}

/* ── Chart area ── */
.sa-chart-wrap {
  position: relative;
  aspect-ratio: 1;
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  padding: var(--space-3);
}

.sa-chart-wrap canvas {
  width: 100% !important;
  height: 100% !important;
}

.sa-chart-legend {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.sa-chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1-5);
}

.sa-chart-legend .dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--accent-primary);
}

.sa-chart-legend .dot.essential { background: var(--danger); }
.sa-chart-legend .dot.recommended { background: var(--warning); }
.sa-chart-legend .dot.advanced { background: var(--success); }

/* ── Coverage summary ── */
.sa-summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-5);
}

@media (max-width: 720px) { .sa-summary-grid { grid-template-columns: repeat(2, 1fr); } }

.sa-summary-card {
  text-align: center;
  padding: var(--space-4);
  background: var(--bg-soft);
  border-radius: var(--radius-lg);
}

.sa-summary-value {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: var(--weight-bold);
  line-height: 1;
  margin-bottom: var(--space-1);
  background: var(--gradient-vivid);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sa-summary-label {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
  font-weight: var(--weight-medium);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

/* ── Category detail (right column) ── */
.sa-category-status {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.sa-priority-pill {
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sa-priority-pill.essential { background: rgba(220, 38, 38, 0.12); color: var(--danger); }
.sa-priority-pill.recommended { background: rgba(217, 119, 6, 0.12); color: var(--warning); }
.sa-priority-pill.advanced { background: rgba(5, 150, 105, 0.12); color: var(--success); }

.sa-gap-current {
  font-size: var(--text-small);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-light);
}

.sa-gap-current strong {
  color: var(--text-primary);
  font-weight: var(--weight-semibold);
}

.sa-alt-heading {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--text-tertiary);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-2);
  margin-top: var(--space-4);
}

.sa-alt-heading:first-of-type { margin-top: 0; }

/* Cell-level capability breakdown */
.sa-cells-list {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-light);
}

.sa-cell-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2);
  font-size: var(--text-xs);
  align-items: center;
  padding: var(--space-2);
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
}

.sa-cell-name {
  font-weight: var(--weight-medium);
  color: var(--text-primary);
}

.sa-cell-score {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 130px;
  justify-content: flex-end;
}

.sa-cell-bar {
  display: block;
  width: 60px;
  height: 6px;
  background: var(--bg-mist);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.sa-cell-bar-fill {
  display: block;
  height: 100%;
  background: var(--accent-primary);
  transition: width var(--transition-normal);
}

.sa-cell-val {
  font-family: var(--font-mono);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  min-width: 38px;
  text-align: right;
}

.sa-cell-max {
  color: var(--text-tertiary);
  font-weight: var(--weight-normal);
}

.sa-cell-vendor {
  grid-column: 1 / -1;
  font-size: 10px;
  color: var(--text-tertiary);
  padding-left: var(--space-2);
  margin-top: -2px;
}

.sa-cell-vendor.sa-cell-uncovered { color: var(--warning); }

/* Alternative vendor row — score-based layout */
.sa-alt-score {
  font-family: var(--font-mono);
  font-weight: var(--weight-bold);
  color: var(--accent-primary);
  background: var(--violet-50);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  min-width: 38px;
  text-align: center;
}

.sa-alt-cells {
  font-size: 10px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.sa-alt-list {
  display: grid;
  gap: var(--space-2);
}

.sa-alt {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2-5) var(--space-3);
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  font-size: var(--text-small);
}

.sa-alt-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  min-width: 0;
}

.sa-alt-name {
  color: var(--text-primary);
  font-weight: var(--weight-medium);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sa-alt-strength {
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.sa-alt-strength.core { background: var(--violet-700); color: var(--text-light); }
.sa-alt-strength.full { background: var(--violet-500); color: var(--text-light); }
.sa-alt-strength.strong { background: var(--violet-300); color: var(--violet-900); }
.sa-alt-strength.moderate { background: var(--violet-100); color: var(--violet-700); }
.sa-alt-strength.partial { background: var(--bg-mist); color: var(--text-secondary); }
.sa-alt-strength.light { background: var(--bg-cloud); color: var(--text-tertiary); }

.sa-alt-add {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: var(--weight-semibold);
  color: var(--accent-primary);
  background: transparent;
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  margin-left: var(--space-2);
}

.sa-alt-add:hover {
  background: var(--accent-primary);
  color: var(--text-light);
}

/* Remove button in the category-detail panel \u2014 mirrors sa-alt-add's
   size/position but in the red palette so it reads as a destructive
   action against the accent-primary Add. */
.sa-alt-remove {
  padding: 4px 10px;
  font-size: 11px;
  font-weight: var(--weight-semibold);
  color: var(--danger);
  background: transparent;
  border: 1px solid rgba(220, 38, 38, 0.4);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  margin-left: var(--space-2);
  font-family: inherit;
}
.sa-alt-remove:hover {
  background: var(--danger);
  color: var(--text-light);
  border-color: var(--danger);
}
.sa-alt.is-in-stack { background: rgba(16, 185, 129, 0.03); }

/* ── No gaps state ── */
.sa-no-gaps {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  background: linear-gradient(135deg, rgba(5, 150, 105, 0.05), rgba(124, 58, 237, 0.03));
  border-radius: var(--radius-xl);
  color: var(--success);
  font-weight: var(--weight-semibold);
}

/* ── Platform CTA ── */
.sa-cta-block {
  background: linear-gradient(135deg, var(--indigo-950), var(--violet-700));
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  color: var(--text-light);
  text-align: center;
}

.sa-cta-block h2 {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-3);
  color: var(--text-light);
}

.sa-cta-block p {
  max-width: 640px;
  margin: 0 auto var(--space-6);
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--text-light-secondary);
}

/* Emphasized words on the dark violet CTA background need to read
   against the gradient — default strong inherits violet, which
   disappears. Light gold adds a clear accent. */
.sa-cta-block strong {
  color: var(--gold-200);
  font-weight: var(--weight-bold);
}

.sa-cta-block .btn-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-body);
  font-weight: var(--weight-semibold);
  color: var(--indigo-950);
  background: var(--text-light);
  border-radius: var(--radius-xl);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.sa-cta-block .btn-cta:hover { transform: translateY(-2px); }

.sa-cta-block .product-links {
  margin-top: var(--space-5);
  font-size: var(--text-small);
  color: var(--text-light-muted);
}

.sa-cta-block .product-links a {
  color: var(--text-light);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sa-footer-note {
  text-align: center;
  margin-top: var(--space-8);
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* ============================================
   Mobile polish
   Narrow viewports: the 18-label radar needs tight padding so the chart
   itself doesn't shrink to nothing, and the rest of the page loses some
   of the generous desktop spacing.
   ============================================ */

@media (max-width: 640px) {
  .sa-page {
    padding: calc(var(--navbar-height) + var(--space-6)) var(--space-4) var(--space-10);
  }
  .sa-hero { margin-bottom: var(--space-6); }

  /* Give the chart more vertical room so labels don't clip off the edges. */
  .sa-chart-wrap {
    padding: 0;
    max-width: 100%;
    /* Slightly taller than square: top/bottom labels get extra breathing
       room without wasting horizontal space. */
    aspect-ratio: 1 / 1.08;
  }

  .sa-panel { padding: var(--space-4); }
  .sa-chart-topbar {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  .sa-signum-toggle { width: 100%; justify-content: center; }
}

@media (max-width: 420px) {
  .sa-chart-wrap {
    /* On phone-narrow screens the label gutter matters more than square
       proportions — tolerate a taller chart so labels are legible. */
    aspect-ratio: 1 / 1.15;
  }
  .sa-chart-legend { font-size: 10px; gap: var(--space-2); }
}