/* MathTools — Math toolbox workbench */

.shell-tools {
  width: min(1120px, calc(100% - 2rem));
}

.no-js-message {
  display: none;
  margin: 0 0 1.25rem;
  padding: 1rem 1.1rem;
  background: var(--danger-soft);
  border: 1px solid color-mix(in srgb, var(--danger) 35%, var(--border));
  border-radius: var(--radius);
  color: var(--danger);
  font-weight: 500;
}

.toolbox-controls {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.search-field {
  position: relative;
  display: block;
}

.search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-muted);
  pointer-events: none;
}

.search-input {
  appearance: none;
  width: 100%;
  margin: 0;
  padding: 0.7rem 0.9rem 0.7rem 2.55rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.search-input::placeholder {
  color: var(--ink-muted);
  font-weight: 400;
}

.search-input:focus,
.search-input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.category-rail-wrap {
  mask-image: none;
  flex-wrap: wrap;
  overflow: visible;
  padding-bottom: 0.15rem;
  margin-bottom: 0;
  gap: 0.35rem;
}

.chip-count {
  display: inline-block;
  margin-left: 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  opacity: 0.75;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
  align-items: start;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease), background 0.18s var(--ease);
}

.tool-card[open] {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  box-shadow: var(--shadow);
}

.tool-summary {
  list-style: none;
  cursor: pointer;
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: background 0.15s var(--ease);
}

.tool-summary::-webkit-details-marker {
  display: none;
}

.tool-summary::after {
  content: "";
  position: absolute;
}

.tool-card > .tool-summary {
  position: relative;
  padding-right: 2rem;
}

.tool-card > .tool-summary::before {
  content: "";
  position: absolute;
  right: 1rem;
  top: 1.15rem;
  width: 0.45rem;
  height: 0.45rem;
  border-right: 2px solid var(--ink-muted);
  border-bottom: 2px solid var(--ink-muted);
  transform: rotate(45deg);
  transition: transform 0.2s var(--ease);
}

.tool-card[open] > .tool-summary::before {
  top: 1.3rem;
  transform: rotate(-135deg);
}

.tool-summary:hover {
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
}

.tool-summary:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.tool-summary-main {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.45rem 0.65rem;
}

.tool-name {
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.tool-cat {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-ink);
  background: var(--accent-soft);
  padding: 0.18rem 0.45rem;
  border-radius: 4px;
}

.tool-blurb {
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

.tool-body {
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--line);
  animation: tool-open 0.28s var(--ease);
}

@keyframes tool-open {
  from {
    opacity: 0.4;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tool-form {
  margin: 0;
  padding-top: 0.85rem;
}

.tool-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.55rem 0.65rem;
}

.tool-field {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  min-width: 0;
}

.tool-field.is-wide {
  grid-column: 1 / -1;
}

.tool-field-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.tool-input {
  appearance: none;
  width: 100%;
  margin: 0;
  padding: 0.5rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 7px;
  line-height: 1.3;
  transition: border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

select.tool-input {
  font-family: var(--font-body);
  background-color: var(--surface-2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1.2 1.2 6 6l4.8-4.8' stroke='%2393a0b4' stroke-width='1.4' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.65rem center;
  padding-right: 1.85rem;
  cursor: pointer;
}

[data-theme="light"] select.tool-input {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1.2 1.2 6 6l4.8-4.8' stroke='%2364748b' stroke-width='1.4' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}

.tool-input:focus,
.tool-input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.tool-btn {
  appearance: none;
  min-height: 2.15rem;
  padding: 0.4rem 0.85rem;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s var(--ease), border-color 0.15s var(--ease), color 0.15s var(--ease), opacity 0.15s var(--ease);
}

.tool-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.tool-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.tool-btn-primary {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
}

.tool-btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.tool-btn-ghost {
  border: 1px solid var(--line);
  background: var(--surface-2);
  color: var(--ink-muted);
}

.tool-btn-ghost:hover:not(:disabled) {
  color: var(--ink);
  border-color: var(--line-strong);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface-2));
}

.tool-output {
  margin-top: 0.75rem;
  padding: 0.7rem 0.8rem;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.tool-result {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 550;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
  word-break: break-word;
  animation: result-in 0.35s var(--ease);
}

.tool-details {
  margin: 0.35rem 0 0;
  font-size: 0.84rem;
  color: var(--ink-muted);
  white-space: pre-wrap;
}

.tool-error {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--danger);
}

.tool-formula {
  margin: 0.75rem 0 0;
  font-size: 0.78rem;
  color: var(--ink-muted);
  line-height: 1.45;
}

.tool-formula span {
  display: inline-block;
  margin-right: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-ink);
}

.tools-summary {
  margin: 1.35rem 0 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.tools-summary strong {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--ink);
}

.tools-empty {
  margin: 0 0 0.85rem;
  padding: 0.85rem 1rem;
  background: var(--surface);
  border: 1px dashed var(--line-strong);
  border-radius: 8px;
  color: var(--ink-muted);
  font-weight: 500;
}

@keyframes result-in {
  from {
    opacity: 0.35;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .tool-body,
  .tool-result {
    animation: none !important;
  }
}

@media (max-width: 760px) {
  .shell-tools {
    width: min(100% - 1.25rem, 1120px);
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .tool-fields {
    grid-template-columns: 1fr;
  }

  .hub-grid {
    grid-template-columns: 1fr;
  }
}

/* Hub + category app chrome */
.toolbox-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 0.85rem;
  font-size: 0.88rem;
  color: var(--ink-muted);
}

.toolbox-crumb a {
  color: var(--accent-ink);
  font-weight: 600;
  text-decoration: none;
}

.toolbox-crumb a:hover {
  text-decoration: underline;
}

.hub-intro {
  margin-bottom: 1rem;
}

.hub-heading {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.hub-lead {
  margin: 0 0 0.85rem;
  color: var(--ink-muted);
  font-size: 0.95rem;
}

.hub-search {
  margin-bottom: 0.25rem;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.hub-card {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 0.95rem 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.hub-card:hover,
.hub-card:focus-visible {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface));
  outline: none;
}

.hub-card-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem 0.75rem;
}

.hub-card-name {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.hub-card-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-ink);
  font-weight: 600;
}

.hub-card-blurb {
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

.toolbox-sibling-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.toolbox-sibling-nav .field-chip,
.toolbox-sibling-nav a.field-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.4rem 0.7rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
}

.toolbox-sibling-nav .field-chip:hover {
  border-color: var(--accent);
}

.toolbox-sibling-nav .field-chip.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.toolbox-sibling-nav .chip-count {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  opacity: 0.75;
}

.tools-summary a {
  color: var(--accent-ink);
  font-weight: 600;
  text-decoration: none;
}

.tools-summary a:hover {
  text-decoration: underline;
}

.tool-field-hint {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.72rem;
  line-height: 1.35;
  color: var(--ink-muted);
  font-weight: 450;
}

.tool-help {
  margin: 0 0 0.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}

.tool-help > summary {
  cursor: pointer;
  list-style: none;
  padding: 0.55rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent-ink);
}

.tool-help > summary::-webkit-details-marker {
  display: none;
}

.tool-help-body {
  padding: 0 0.85rem 0.85rem;
  border-top: 1px solid var(--line);
}

.tool-help-lead,
.tool-help-example,
.tool-help-notes,
.tool-help-footer {
  margin: 0.65rem 0 0;
  font-size: 0.88rem;
  line-height: 1.45;
  color: var(--ink);
}

.tool-help-footer {
  color: var(--ink-muted);
  font-size: 0.8rem;
}

.tool-help-formula {
  margin: 0.55rem 0 0;
  padding: 0.55rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--accent-ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.tool-help-formula span {
  display: inline-block;
  margin-right: 0.4rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.tool-help-h {
  margin: 0.75rem 0 0.3rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.tool-help-steps {
  margin: 0;
  padding-left: 1.15rem;
  font-size: 0.86rem;
  color: var(--ink);
  line-height: 1.45;
}

.tool-help-steps li + li {
  margin-top: 0.25rem;
}

.tool-help-vars {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.tool-help-vars li {
  display: grid;
  grid-template-columns: minmax(4rem, auto) 1fr;
  gap: 0.5rem;
  font-size: 0.84rem;
}

.tool-help-vars .sym {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-ink);
}

.category-help {
  margin: 0 0 1rem;
  padding: 0.95rem 1.05rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.category-help-title {
  margin: 0 0 0.4rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.category-help-blurb,
.category-help-howto {
  margin: 0 0 0.55rem;
  font-size: 0.92rem;
  line-height: 1.45;
  color: var(--ink);
}

.category-help-howto {
  color: var(--ink-muted);
}

.category-help-points {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--ink-muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.hub-help-list {
  margin: 0 0 0.9rem;
  padding-left: 1.15rem;
  color: var(--ink-muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

.hub-card-help {
  font-size: 0.8rem;
  line-height: 1.4;
  color: var(--ink-muted);
}