.terrain-page {
  background:
    radial-gradient(circle at top left, rgba(186, 230, 253, 0.25), transparent 32%),
    linear-gradient(180deg, var(--color-hero-top) 0%, var(--color-bg) 100%);
}

.terrain-intro {
  max-width: 52rem;
}

.terrain-panel,
.terrain-controls-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
}

.terrain-value-pill {
  display: inline-block;
  min-width: 3rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary-hover);
  font-size: 0.9rem;
  font-weight: 600;
  text-align: center;
}

.terrain-slice-module {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  padding: 1.25rem 1.35rem;
  background: var(--color-hero-top);
  border: 1px solid var(--color-border);
  border-radius: 1rem;
}

.terrain-slice-copy {
  max-width: 15rem;
}

.terrain-slice-help {
  color: var(--color-muted);
  font-size: 0.95rem;
}

.terrain-slice-module-compact {
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 1rem;
}

.terrain-slice-module-compact .terrain-slice-copy {
  max-width: none;
}

.terrain-slice-module-compact .terrain-slice-control {
  justify-content: center;
}

.terrain-slice-control {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.terrain-slice-scale {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-self: stretch;
  padding: 0.4rem 0;
  color: var(--color-muted);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.terrain-slice-visual {
  width: 7rem;
  height: 10.5rem;
  padding: 0.45rem 0.35rem;
  border-radius: 0.95rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.terrain-slice-svg {
  width: 100%;
  height: 100%;
  display: block;
}

.terrain-slice-mountain-base {
  fill: #e2e8f0;
}

.terrain-slice-mountain-fill {
  fill: var(--color-primary);
  opacity: 0.32;
}

.terrain-slice-mountain-outline {
  fill: none;
  stroke: var(--color-text);
  stroke-width: 3;
  stroke-linejoin: round;
}

.terrain-slice-marker-line {
  stroke: var(--color-primary);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 4 5;
}

.terrain-range-vertical {
  width: 1.35rem;
  height: 11.5rem;
  margin: 0;
  writing-mode: vertical-lr;
  direction: rtl;
  accent-color: var(--color-primary);
}

.terrain-control-stack {
  display: grid;
  gap: 1rem;
}

.terrain-label-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.9rem;
  margin: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.85rem;
}

.terrain-label-toggle.form-switch {
  padding-left: 0.9rem;
}

.terrain-label-toggle .form-check-input {
  margin: 0;
  float: none;
  flex: 0 0 auto;
}

.terrain-label-toggle .form-check-label {
  margin: 0;
  color: var(--color-text);
}

.terrain-stage {
  position: relative;
  min-height: 27rem;
  border-radius: 1rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.terrain-visual-card-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.terrain-stage-3d canvas {
  cursor: grab;
}

.terrain-stage-3d canvas:active {
  cursor: grabbing;
}

.terrain-stage canvas,
.terrain-stage svg {
  display: block;
  width: 100%;
  height: 100%;
}

.terrain-stage-caption {
  padding: 0.9rem 1rem;
  border-radius: 0.85rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.9rem;
  line-height: 1.45;
}

.terrain-explainer-grid {
  display: grid;
  gap: 1rem;
}

.terrain-explainer-item {
  padding: 1rem;
  border-radius: 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.terrain-explainer-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.terrain-explainer-kicker {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.75rem;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 700;
}

.terrain-explainer-graphic {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.9rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  margin-bottom: 0.85rem;
}

.terrain-explainer-summary {
  margin: 0 0 0.45rem;
  color: var(--color-text);
  line-height: 1.5;
}

.terrain-explainer-emphasis {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.terrain-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
}

.terrain-process-intro {
  max-width: 52rem;
}

.terrain-flow-step {
  padding: 0.75rem 0.85rem;
  border-radius: 0.85rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
}

.terrain-flow-step-note {
  color: var(--color-muted);
  font-size: 0.82rem;
  line-height: 1.4;
}

.terrain-flow-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-muted);
  font-size: 1.6rem;
  font-weight: 600;
}

.terrain-flow-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 3.5rem;
  margin-bottom: 0.6rem;
  border-radius: 0.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.terrain-flow-icon svg {
  width: 100%;
  max-width: 7rem;
  height: auto;
  display: block;
}

.terrain-flow-icon svg path {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.terrain-flow-icon-terrain svg path:first-child {
  fill: rgba(56, 189, 248, 0.16);
  stroke: none;
}

.terrain-flow-icon-terrain svg path:last-child {
  stroke: var(--color-primary);
  stroke-width: 3;
}

.dem-cell {
  fill: var(--color-surface);
  stroke: var(--color-border);
  stroke-width: 1.5;
}

.dem-value {
  fill: var(--color-primary);
  font-family: var(--font-mono), monospace;
  font-size: 10px;
  font-weight: 700;
  text-anchor: middle;
  dominant-baseline: middle;
}

.terrain-flow-icon-slice svg path:first-child {
  stroke: var(--color-primary);
  stroke-width: 3;
}

.terrain-flow-icon-slice svg path:not(:first-child) {
  stroke: rgba(14, 165, 233, 0.78);
  stroke-width: 2.5;
}

.terrain-flow-icon-contour svg ellipse {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 2.5;
}

.terrain-demo-ground {
  fill: #edf4f7;
}

.terrain-demo-profile-fill {
  fill: rgba(74, 163, 209, 0.18);
}

.terrain-demo-profile-line {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 3;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.terrain-demo-grid {
  stroke: rgba(100, 116, 139, 0.28);
  stroke-width: 1;
}

.terrain-demo-block {
  fill: rgba(45, 212, 191, 0.18);
  stroke: rgba(15, 118, 110, 0.45);
  stroke-width: 1.2;
}

.terrain-demo-sampled-trace {
  fill: none;
  stroke: rgba(220, 38, 38, 0.58);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.terrain-demo-slice-line {
  stroke: rgba(14, 165, 233, 0.65);
  stroke-width: 2.2;
  stroke-linecap: round;
}

.terrain-demo-terrain-main {
  fill: none;
  stroke: var(--color-text);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.terrain-demo-topo-main {
  fill: none;
  stroke: var(--color-primary);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.terrain-demo-topo-active {
  stroke: var(--color-primary-hover);
  stroke-width: 3.2;
}

.terrain-demo-label {
  fill: var(--color-muted);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.terrain-scene-bar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.terrain-scene-bar .form-text {
  margin-top: 0;
  color: var(--color-muted);
}

.terrain-metadata {
  display: grid;
  gap: 0.9rem;
}

.terrain-metadata div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--color-border);
}

.terrain-metadata dt {
  margin: 0;
  color: var(--color-muted);
  font-weight: 600;
}

.terrain-metadata dd {
  margin: 0;
  color: var(--color-text);
  text-align: right;
}

.terrain-notes {
  display: grid;
  gap: 0.85rem;
}

.terrain-note-item,
.terrain-note-muted {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
  padding: 0.85rem 0.95rem;
  border-radius: 0.95rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.terrain-note-muted {
  grid-template-columns: 1fr;
}

.terrain-note-index {
  display: inline-flex;
  width: 1.7rem;
  height: 1.7rem;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-size: 0.8rem;
  font-weight: 700;
}

.terrain-svg-bg {
  fill: var(--color-bg);
}

.terrain-contour {
  fill: none;
  stroke: var(--color-primary);
  stroke-linecap: round;
  stroke-width: 1.6;
  opacity: 0.65;
}

.terrain-contour-active {
  stroke: var(--color-primary-hover);
  stroke-width: 3.4;
  opacity: 1;
}

.terrain-contour:hover {
  stroke: var(--color-text);
  opacity: 1;
}

.terrain-svg-label,
.terrain-svg-meta {
  fill: var(--color-text);
  font-size: 12px;
  font-family: var(--font-sans);
}

.terrain-svg-label {
  font-weight: 700;
}

@media (max-width: 991.98px) {
  .terrain-stage {
    min-height: 23rem;
  }

  .terrain-flow {
    grid-template-columns: 1fr;
  }

  .terrain-flow-arrow {
    transform: rotate(90deg);
    min-height: 1.5rem;
  }

  .terrain-slice-module {
    flex-direction: column;
    align-items: stretch;
  }

  .terrain-slice-control {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 575.98px) {
  .terrain-stage {
    min-height: 18rem;
  }

  .terrain-scene-bar {
    flex-direction: column;
    align-items: stretch;
  }

  .terrain-scene-bar select {
    max-width: none !important;
  }

  .terrain-metadata div {
    flex-direction: column;
  }

  .terrain-metadata dd {
    text-align: left;
  }

  .terrain-slice-control {
    gap: 0.6rem;
    justify-content: flex-start;
  }

  .terrain-slice-visual {
    width: 5.8rem;
    height: 9.25rem;
  }

  .terrain-range-vertical {
    height: 10rem;
  }

  .terrain-label-toggle {
    width: 100%;
    justify-content: center;
  }

  .terrain-explainer-head {
    align-items: flex-start;
    flex-direction: column;
  }
}