/* ── Engineering Tools ── */

body.tool-page,
body.tools-hub {
  overflow-x: clip;
}

.tool-page main,
.tools-hub main {
  max-width: min(76rem, 100%);
  min-width: 0;
}

.tool-page .site-header nav,
.tools-hub .site-header nav {
  max-width: min(76rem, 100%);
}

/* ── Sidebar + workspace grid ── */
.tool-layout {
  display: grid;
  grid-template-columns: 12.5rem minmax(0, 1fr);
  gap: 2rem;
  align-items: start;
}

@media (max-width: 900px) {
  .tool-layout {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .tool-sidebar {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 0.75rem;
    padding: 0.85rem 1rem;
  }

  .tool-sidebar__home {
    width: 100%;
    margin-bottom: 0.25rem;
  }

  .tool-sidebar__block {
    display: contents;
  }

  .tool-sidebar__heading {
    display: none;
  }

  .tool-sidebar__list {
    display: contents;
  }

  .tool-sidebar__link {
    display: inline-block;
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--aeon-border);
    border-radius: 999px;
    font-size: 0.78rem;
    background: var(--aeon-card);
  }

  .tool-sidebar__link.is-active {
    border-color: var(--aeon-accent);
  }
}

.tool-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 1rem);
  padding: 1rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-card);
}

.tool-sidebar__home {
  display: inline-block;
  margin-bottom: 0.85rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--aeon-mono);
  text-decoration: none;
}

.tool-sidebar__home:hover {
  color: var(--aeon-accent);
}

.tool-sidebar__block + .tool-sidebar__block {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--aeon-border);
}

.tool-sidebar__heading {
  margin: 0 0 0.45rem;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.tool-sidebar__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.2rem;
}

.tool-sidebar__link {
  display: block;
  padding: 0.35rem 0.45rem;
  border-radius: 2px;
  color: var(--aeon-text);
  text-decoration: none;
  font-size: 0.92rem;
  line-height: 1.35;
}

.tool-sidebar__link:hover {
  background: var(--aeon-surface);
  color: var(--aeon-accent);
}

.tool-sidebar__link.is-active {
  background: color-mix(in srgb, var(--aeon-accent) 12%, var(--aeon-card));
  color: var(--aeon-accent);
}

.tool-workspace__intro {
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--aeon-border);
}

.tool-workspace__intro h1 {
  margin-bottom: 0.5rem;
}

/* ── Standard tool panel (controls + diagram) ── */
.tool-app {
  display: grid;
  gap: 1.25rem;
}

.tool-panel {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 900px) {
  .tool-panel--split {
    grid-template-columns: minmax(17rem, 24rem) minmax(0, 1fr);
    align-items: start;
  }
}

/* ── Chart-first layout (psychrometric) ── */
.tool-visual {
  display: grid;
  gap: 1rem;
}

.tool-visual__stage {
  position: relative;
  padding: 1rem 1rem 0.75rem;
  border: 1px solid var(--aeon-border);
  border-radius: 3px;
  background: var(--aeon-card);
  box-shadow: var(--aeon-shadow-sm);
}

.tool-chart {
  --chart-bg: #f7faf8;
  --chart-grid: rgba(46, 90, 60, 0.1);
  --chart-axis: rgba(46, 90, 60, 0.55);
  --chart-text: #2E6B48;
  --chart-rh: rgba(58, 122, 82, 0.45);
  --chart-rh-sat: rgba(46, 90, 60, 0.9);
  --chart-enthalpy: rgba(90, 111, 100, 0.42);
  --chart-point: #3A7A52;
  --chart-cross: rgba(58, 122, 82, 0.4);
  width: 100%;
  min-width: 0;
  overflow: hidden;
}

[data-theme='dark'] .tool-chart {
  --chart-bg: #141a17;
  --chart-grid: rgba(126, 184, 154, 0.1);
  --chart-axis: rgba(126, 184, 154, 0.5);
  --chart-text: #9AADA3;
  --chart-rh: rgba(92, 173, 126, 0.42);
  --chart-rh-sat: rgba(123, 196, 154, 0.92);
  --chart-enthalpy: rgba(154, 173, 163, 0.28);
  --chart-point: #5CAD7E;
  --chart-cross: rgba(92, 173, 126, 0.45);
}

.tool-chart canvas {
  display: block;
  max-width: 100%;
  margin: 0 auto;
  cursor: crosshair;
  touch-action: none;
  border-radius: 2px;
}

.tool-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin-top: 0.85rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--aeon-border);
}

.tool-chart-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--aeon-muted);
}

.tool-chart-legend__swatch {
  width: 1.35rem;
  height: 0;
  border-top: 2px solid var(--aeon-accent);
}

.tool-chart-legend__swatch--dashed {
  border-top-style: dashed;
  opacity: 0.65;
}

.tool-chart-legend__swatch--enthalpy {
  border-top-style: dotted;
  border-color: var(--aeon-muted);
}

.tool-visual__console {
  display: grid;
  gap: 1rem;
}

@media (min-width: 900px) {
  .tool-visual__console {
    grid-template-columns: 1.1fr 1fr;
    align-items: start;
  }
}

.tool-visual__hint {
  margin: 0;
  font-size: 0.88rem;
  color: var(--aeon-muted);
  line-height: 1.45;
}

.tool-visual__hint--touch {
  display: none;
}

.tool-visual__hint--pointer {
  display: block;
}

@media (hover: none) and (pointer: coarse) {
  .tool-visual__hint--touch {
    display: block;
  }

  .tool-visual__hint--pointer {
    display: none;
  }
}

.tool-visual__hint kbd {
  font-family: 'DejaVu Sans Mono', Consolas, Monaco, monospace;
  font-size: 0.75em;
  padding: 0.1em 0.35em;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-surface);
}

.tool-controls {
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--aeon-border);
  border-radius: 3px;
  background: var(--aeon-card);
  box-shadow: var(--aeon-shadow-sm);
}

.tool-controls__title {
  margin: 0 0 0.85rem;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.tool-field + .tool-field {
  margin-top: 0.85rem;
}

.tool-field label {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.35rem;
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.tool-field label span:last-child {
  color: var(--aeon-text);
  font-size: 0.75rem;
}

.tool-field input[type='range'] {
  width: 100%;
  accent-color: var(--aeon-accent);
}

.tool-field input[type='number'],
.tool-field select {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: var(--aeon-bg);
  color: var(--aeon-text);
  font-size: 0.95rem;
}

.tool-field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

.tool-results {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.35rem 1rem;
  margin: 0;
}

.tool-results__label {
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.tool-results__value {
  margin: 0;
  font-size: 1.05rem;
  color: var(--aeon-text);
}

.tool-diagram {
  padding: 1rem;
  border: 1px solid var(--aeon-border);
  border-radius: 3px;
  background: var(--aeon-card);
  box-shadow: var(--aeon-shadow-sm);
}

.tool-diagram__svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  --diagram-bg: #f4f6f5;
  --diagram-panel: rgba(255, 255, 255, 0.92);
  --diagram-grid-minor: rgba(46, 90, 60, 0.07);
  --diagram-grid-major: rgba(46, 90, 60, 0.16);
  --diagram-axis: rgba(46, 90, 60, 0.38);
  --diagram-stroke: #2E5A3C;
  --diagram-accent: #3A7A52;
  --diagram-label: #1A2E24;
  --diagram-mono: #2E6B48;
  --diagram-fill: rgba(46, 90, 60, 0.1);
}

[data-theme="dark"] .tool-diagram__svg {
  --diagram-bg: #161b18;
  --diagram-panel: rgba(26, 34, 30, 0.94);
  --diagram-grid-minor: rgba(126, 184, 154, 0.07);
  --diagram-grid-major: rgba(126, 184, 154, 0.17);
  --diagram-axis: rgba(126, 184, 154, 0.42);
  --diagram-stroke: #7BC49A;
  --diagram-accent: #5CAD7E;
  --diagram-label: #E5EDE8;
  --diagram-mono: #9AADA3;
  --diagram-fill: rgba(126, 184, 154, 0.12);
}

.tool-diagram__caption {
  margin: 0.65rem 0 0;
  font-size: 0.85rem;
  color: var(--aeon-muted);
  line-height: 1.45;
}

.tool-note {
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border-left: 3px solid var(--aeon-accent);
  background: color-mix(in srgb, var(--aeon-accent) 8%, var(--aeon-card));
  font-size: 0.92rem;
  color: var(--aeon-muted);
  line-height: 1.5;
}

.tools-hub__grid {
  display: grid;
  gap: 0.85rem;
}

button.fe-tool-card {
  width: 100%;
  font: inherit;
  cursor: pointer;
}

@media (min-width: 640px) {
  .tools-hub__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.lesson-related-tools {
  margin-bottom: 1.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--aeon-border);
  border-radius: 2px;
  background: color-mix(in srgb, var(--aeon-card) 92%, transparent);
}

.lesson-related-tools__label {
  margin: 0 0 0.45rem;
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--aeon-mono);
}

.lesson-related-tools__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.lesson-related-tools__link {
  color: var(--aeon-accent);
  text-decoration: none;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

.lesson-related-tools__link:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .tool-page main,
  .tools-hub main {
    padding-top: 2rem;
    padding-bottom: 2rem;
  }

  .tool-layout {
    gap: 1rem;
  }

  .tool-sidebar {
    padding: 0.75rem 0.85rem;
    gap: 0.45rem 0.55rem;
  }

  .tool-sidebar__link {
    padding: 0.45rem 0.75rem;
    min-height: 2.25rem;
    line-height: 1.3;
  }

  .tool-workspace__intro {
    margin-bottom: 1.25rem;
    padding-bottom: 1rem;
  }

  .tool-visual__stage {
    padding: 0.75rem 0.65rem 0.65rem;
  }

  .tool-chart-legend {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
  }

  .tool-chart-legend__item {
    font-size: 0.68rem;
  }

  .tool-controls {
    padding: 1rem;
  }

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

  .tool-field input[type='number'],
  .tool-field select {
    min-height: 2.75rem;
    font-size: 1rem;
  }

  .tool-field input[type='range'] {
    min-height: 2rem;
  }

  .tool-chart-legend {
    gap: 0.5rem 0.85rem;
  }

  .tool-diagram {
    padding: 0.75rem;
  }

  .tool-results {
    gap: 0.3rem 0.75rem;
  }

  .tool-results__value {
    font-size: 0.98rem;
    overflow-wrap: anywhere;
  }
}