/* ── Design Tokens ──────────────────────────── */
:root {
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --border-radius: 0;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-md: 1.125rem;
    --font-weight-normal: 400;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
}

/* ── Map ───────────────────────────────────── */
#investigation-map {
    border: 1px solid var(--theme-border);
    border-radius: var(--border-radius);
    height: 600px;
    width: 100%;
}

/* ── Step header ───────────────────────────── */
.step-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}
.step-header-actions {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

/* ── Section line controls ─────────────────── */
.section-line-controls {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--theme-border);
}
.section-line-controls.no-border {
    margin-top: 0;
    padding-top: 0;
    border-top: none;
}
#draw-section-btn.active {
    background: #e63946 !important;
    color: #fff !important;
}
.corridor-slider-wrap {
    margin-top: var(--spacing-sm);
}
.corridor-slider-wrap label {
    display: block;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
}
.corridor-slider-container {
    width: 100%;
    margin-top: var(--spacing-xs);
}
.corridor-value-container {
    width: 100%;
    margin-top: var(--spacing-xs);
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
}

/* ── Borehole Cards ───────────────────────── */
.borehole-card-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    max-height: 500px;
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: var(--spacing-xs);
}
.borehole-card-list::-webkit-scrollbar {
    width: 6px;
}
.borehole-card-list::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 3px;
}
.borehole-card-list::-webkit-scrollbar-thumb {
    background: rgba(29, 77, 62, 0.3);
    border-radius: 3px;
}
.borehole-card-list::-webkit-scrollbar-thumb:hover {
    background: rgba(29, 77, 62, 0.5);
}
.borehole-config-card {
    border: 1px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    background: var(--theme-background);
    box-shadow: none;
    transition: box-shadow 0.2s ease;
}
.borehole-config-card.is-draft {
    border-color: rgba(53, 88, 74, 0.28);
    background: var(--theme-background);
}
.borehole-config-card.is-active {
    box-shadow: 0 0 0 2px rgba(29, 77, 62, 0.22);
}
.borehole-card-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
}
.borehole-state {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--theme-secondary-mid);
    background: #f5f5f5;
    border-radius: 999px;
    padding: 0.18rem var(--spacing-xs);
}
.borehole-state.draft {
    color: var(--theme-secondary-mid);
    background: #f5f5f5;
}
.borehole-card-name {
    width: 100%;
    margin-bottom: var(--spacing-xs);
}
.borehole-card-coords {
    margin: 0 0 var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-muted, #667);
}
.depth-config-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
.depth-config-slider,
#corridor-width-slider,
.parameter-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #e0e0e0;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    margin: 0;
}
.depth-config-slider::-webkit-slider-thumb,
#corridor-width-slider::-webkit-slider-thumb,
.parameter-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #1d4d3e;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: none;
}
.depth-config-slider::-moz-range-thumb,
#corridor-width-slider::-moz-range-thumb,
.parameter-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #1d4d3e;
    cursor: pointer;
    border: 2px solid white;
    box-shadow: none;
}
.depth-config-slider:disabled,
#corridor-width-slider:disabled,
.parameter-slider:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.depth-config-slider:disabled::-webkit-slider-thumb,
#corridor-width-slider:disabled::-webkit-slider-thumb,
.parameter-slider:disabled::-webkit-slider-thumb {
    cursor: not-allowed;
}
.depth-config-slider:disabled::-moz-range-thumb,
#corridor-width-slider:disabled::-moz-range-thumb,
.parameter-slider:disabled::-moz-range-thumb {
    cursor: not-allowed;
}
.depth-config-input {
    width: 96px;
    height: 38px;
    padding: 0 10px;
    border: 1px solid rgba(29, 77, 62, 0.22);
    border-radius: 0;
    background: rgba(255, 255, 255, 0.75);
    color: var(--theme-text);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    box-shadow: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}
.depth-config-input:focus {
    outline: none;
    border-color: rgba(29, 77, 62, 0.55);
    background: #fff;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.95),
        0 0 0 3px rgba(29, 77, 62, 0.12);
}
.depth-config-input:disabled {
    color: rgba(38, 71, 60, 0.6);
    background: rgba(235, 235, 235, 0.8);
}
.depth-config-row input[type=number] {
    width: 96px;
}
.depth-config-input::-webkit-outer-spin-button,
.depth-config-input::-webkit-inner-spin-button {
    margin: 0;
}
.depth-caption {
    margin: var(--spacing-xs) 0;
    font-size: var(--font-size-sm);
    color: var(--text-muted, #667);
}
.borehole-card-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-top: var(--spacing-xs);
}
.borehole-map-icon {
    background: transparent;
    border: 0;
}
.borehole-map-icon svg {
    display: block;
    width: 24px;
    height: 24px;
    filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.3));
}
.borehole-map-icon.is-draft svg {
    opacity: 0.82;
}
.borehole-label {
    font-size: 11px;
    font-weight: 600;
    color: #1d4d3e;
    background: rgba(255, 255, 255, 0.9);
    padding: 2px 6px;
    border-radius: 0;
    border: 1px solid rgba(29, 77, 62, 0.2);
    white-space: nowrap;
    pointer-events: none;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.8);
    box-shadow: none;
}
.borehole-label.draft {
    color: var(--theme-secondary-mid);
    background: rgba(255, 255, 255, 0.85);
    border-color: rgba(111, 143, 130, 0.3);
}
.section-node-marker {
    cursor: move;
}
.section-node-marker:hover {
    cursor: grab;
}
.section-node-marker:active {
    cursor: grabbing;
}

/* ── Cross-section Manager ──────────────────── */
.cs-manager-panel {
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    background: var(--theme-background);
    border: 1px solid var(--theme-border);
    box-shadow: none;
}

/* ── Cross-section Main Card ─────────────────── */
.cs-main-card {
    border: 1.5px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background: var(--theme-background);
    box-shadow: none;
}
.cs-main-card .section-frame {
    margin-top: var(--spacing-md);
}

/* ── Cross-section ─────────────────────────── */
.section-frame {
    border: none;
    border-radius: var(--border-radius);
    overflow: hidden;
    position: relative;
    box-shadow: none;
    background: var(--theme-background);
}
#cs-svg {
    display: block;
    height: 520px;
    width: 100%;
    cursor: default;
}
.cs-controls-row {
    display: grid;
    grid-template-columns: 40% 60%;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}
.cs-main-card .cs-controls-row {
    margin-bottom: var(--spacing-md);
}
@media (max-width: 768px) {
    .cs-controls-row {
        grid-template-columns: 1fr;
    }
}
.cs-legend-card {
    border: none;
    border-radius: var(--border-radius);
    padding: var(--spacing-xs);
    background: transparent;
    box-shadow: none;
}
.cs-legend-card h3 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--theme-text);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid rgba(29, 77, 62, 0.1);
}
.cs-main-card .cs-control-panel h3 {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--theme-text);
    padding-bottom: var(--spacing-xs);
    border-bottom: 1px solid rgba(29, 77, 62, 0.1);
}
.legend-two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}
.legend-column {
    display: flex;
    flex-direction: column;
}
.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-xs);
    font-size: var(--font-size-sm);
    line-height: 1.5;
    padding: 0.2rem 0;
}
.legend-item:last-child {
    margin-bottom: 0;
}
.legend-item-square {
    width: 14px;
    height: 14px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}
.legend-item-line {
    width: 20px;
    height: 2px;
    flex-shrink: 0;
}
.legend-chip {
    align-items: center;
    display: inline-flex;
    font-size: var(--font-size-sm);
    gap: 0.4rem;
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}
.legend-chip span {
    border-radius: 999px;
    display: inline-block;
    height: 12px;
    width: 12px;
}

/* ── Control panel ─────────────────────────── */
.cs-main-card .cs-control-panel {
    margin-top: 0;
    box-shadow: none;
    border: none;
}
.cs-main-card .cs-legend-card {
    padding: 0;
}
.cs-control-panel,
.viz-controls {
    margin-top: 0;
    box-shadow: none;
    border: 1.5px solid var(--theme-border);
}
.cs-control-panel .toggle-row,
.viz-controls .toggle-row {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.3rem 0;
}
.cs-control-panel .toggle-row label,
.viz-controls .toggle-row label {
    cursor: pointer;
    font-size: var(--font-size-base);
    transition: color 0.2s ease;
}
.cs-control-panel .toggle-row label:hover,
.viz-controls .toggle-row label:hover {
    opacity: 0.8;
}

/* ── Custom Checkbox Styling ───────────────── */
.custom-checkbox {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(29, 77, 62, 0.3);
    border-radius: 0;
    background: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    flex-shrink: 0;
}
.custom-checkbox:hover,
.custom-radio:hover {
    border-color: rgba(29, 77, 62, 0.5);
    box-shadow: none;
}
.custom-checkbox:checked {
    background: #1d4d3e;
    border-color: #1d4d3e;
}
.custom-checkbox:checked::after {
    content: '';
    position: absolute;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}
.custom-checkbox:focus,
.custom-radio:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(29, 77, 62, 0.2);
}

/* ── Custom Radio Button Styling ────────────── */
.custom-radio {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(29, 77, 62, 0.3);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
    flex-shrink: 0;
}
.custom-radio:checked {
    border-color: #1d4d3e;
}
.custom-radio:checked::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #1d4d3e;
}

/* ── Toggle Switch Styling ───────────────────── */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}
.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}
.toggle-switch-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(29, 77, 62, 0.2);
    transition: 0.3s;
    border-radius: 24px;
}
.toggle-switch-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
    box-shadow: none;
}
.toggle-switch input:checked + .toggle-switch-slider {
    background-color: #1d4d3e;
}
.toggle-switch input:checked + .toggle-switch-slider:before {
    transform: translateX(20px);
}
.toggle-switch input:focus + .toggle-switch-slider {
    box-shadow: 0 0 0 3px rgba(29, 77, 62, 0.2);
}
.toggle-switch:hover .toggle-switch-slider {
    background-color: rgba(29, 77, 62, 0.3);
}
.toggle-switch input:checked:hover + .toggle-switch-slider {
    background-color: rgba(29, 77, 62, 0.8);
}

.cs-control-panel h4,
.viz-controls h4 {
    margin: var(--spacing-sm) 0 var(--spacing-xs);
    font-size: var(--font-size-md);
    color: var(--theme-text);
    font-weight: var(--font-weight-semibold);
    line-height: 1.4;
}
.cs-control-panel h4:first-child,
.viz-controls h4:first-child {
    margin-top: 0;
}
.cs-control-panel,
.section-panel {
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    background: var(--theme-background);
}
.cs-main-card .cs-control-panel {
    padding: 0;
    background: transparent;
}
.cs-control-panel label,
.viz-controls label {
    display: block;
    font-weight: var(--font-weight-semibold);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}
.cs-control-panel input[type=range],
.viz-controls input[type=range] {
    width: 100%;
}
.cs-control-panel select,
.viz-controls select {
    width: 100%;
    margin-bottom: var(--spacing-xs);
}
.button-group {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}
.button-group-sm {
    margin-top: var(--spacing-sm);
}

/* ── Section Title Styling ─────────────────── */
.section-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
    margin: 0 0 var(--spacing-sm) 0;
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid rgba(29, 77, 62, 0.15);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
.section-title i {
    opacity: 0.7;
}

/* ── Layer Card Styling ─────────────────────── */
.layer-card {
    border: 1.5px solid;
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    background: var(--theme-background);
    box-shadow: none;
    transition: all 0.2s ease;
}
.layer-card:hover {
    box-shadow: none;
    transform: translateY(-1px);
}
.layer-card.active {
    border-width: 2px;
    box-shadow: 0 0 0 3px rgba(29, 77, 62, 0.15);
}
.layer-card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
.layer-card-color-indicator {
    width: 20px;
    height: 20px;
    border-radius: 0;
    border: 1px solid rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}
.layer-card-name {
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
    flex: 1;
}
.layer-card-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}
.layer-card-control-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
.layer-card-control-group > label:first-child {
    font-size: var(--font-size-sm);
    cursor: pointer;
    user-select: none;
    margin: 0;
}
.layer-card-control-group .toggle-switch {
    margin: 0;
}
.layer-card-remove-btn {
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-xs);
    border-radius: 0;
    border: 1px solid rgba(230, 57, 70, 0.3);
    background: rgba(230, 57, 70, 0.1);
    color: #e63946;
    cursor: pointer;
    transition: all 0.2s ease;
}
.layer-card-remove-btn:hover {
    background: rgba(230, 57, 70, 0.2);
    border-color: rgba(230, 57, 70, 0.5);
}
.layer-cards-container,
.histogram-cards-grid,
.layer-parameter-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}
@media (max-width: 768px) {
    .layer-cards-container {
        grid-template-columns: 1fr;
    }
}
.cs-data-tracks-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xs);
}
.cs-data-tracks-grid .toggle-row {
    margin: 0;
}

/* ── Button Improvements ────────────────────── */
.ui.button {
    transition: all 0.2s ease;
}
.ui.button:hover {
    transform: translateY(-1px);
    box-shadow: none;
}
.ui.button:active {
    transform: translateY(0);
}
.pick-btn {
    transition: all 0.2s ease;
}
.pick-btn:hover {
    transform: translateY(-1px);
    box-shadow: none;
}
.pick-btn.active {
    transform: translateY(-1px);
}

/* ── Status Message Styling ─────────────────── */
#section-status,
#cs-line-status {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(29, 77, 62, 0.05);
    border-left: 3px solid rgba(29, 77, 62, 0.3);
    border-radius: 0;
    font-size: var(--font-size-sm);
    color: var(--theme-text);
    margin-top: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
#section-status i,
#cs-line-status i {
    opacity: 0.7;
}

/* ── Pick nodes ────────────────────────────── */
.pick-node {
    cursor: grab;
    transition: all 0.2s ease;
}
.pick-node:active {
    cursor: grabbing;
}
.pick-node.selected {
    stroke: #e63946 !important;
    stroke-width: 4 !important;
    filter: drop-shadow(0 0 4px rgba(230, 57, 70, 0.6));
    r: 8;
}
.pick-btn.active {
    box-shadow: 0 0 0 2px #e63946;
}
.pick-btn-group {
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}
#cs-layer-picking-panel .pick-btn-group {
    flex-direction: row;
}
.pick-help-text {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--text-muted, #667);
    line-height: 1.5;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(29, 77, 62, 0.03);
    border-radius: 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}
.pick-help-text i {
    opacity: 0.6;
}

/* ── Saved Sections ─────────────────────────── */
.saved-sections-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}
.saved-section-card {
    border: 1.5px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm);
    background: var(--theme-background);
    box-shadow: none;
    cursor: pointer;
    transition: all 0.2s ease;
}
.saved-section-card:hover {
    box-shadow: none;
    transform: translateY(-1px);
}
.saved-section-card-title {
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
    margin-bottom: var(--spacing-xs);
}
.saved-section-card-time {
    font-size: var(--font-size-sm);
    color: var(--text-muted, #667);
}

/* ── Histogram Cards ─────────────────────────── */
@media (max-width: 768px) {
    .histogram-cards-grid {
        grid-template-columns: 1fr;
    }
}
.histogram-card {
    border: 1.5px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background: var(--theme-background);
    box-shadow: none;
    cursor: pointer;
    transition: all 0.2s ease;
}
.histogram-card:hover {
    box-shadow: none;
    transform: translateY(-1px);
}
.histogram-card.selected {
    border-color: #1d4d3e;
    border-width: 2px;
    box-shadow: 0 0 0 3px rgba(29, 77, 62, 0.15);
    background: var(--theme-background);
}
.histogram-card-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid rgba(29, 77, 62, 0.15);
}
.histogram-card-title,
.layer-card-title {
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
    margin: 0;
}
.histogram-card-unit {
    font-size: var(--font-size-sm);
    color: var(--text-muted, #667);
}
.histogram-container {
    width: 100%;
    height: 200px;
    position: relative;
}
.histogram-svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* ── Layer Parameter Cards ─────────────────────────── */
@media (max-width: 1200px) {
    .layer-parameter-cards-grid {
        grid-template-columns: 1fr;
    }
}
.layer-parameter-card {
    border: 1.5px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background: var(--theme-background);
    box-shadow: none;
    transition: all 0.2s ease;
}
.layer-parameter-card:hover {
    box-shadow: none;
}
.layer-card-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid rgba(29, 77, 62, 0.15);
}
.layer-card-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}
.layer-histograms {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}
.layer-histogram-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}
.layer-histogram-label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--text-muted, #667);
}
.layer-histogram-item .histogram-container {
    width: 100%;
    height: 120px;
    position: relative;
}
.parameter-slider-container {
    width: 100%;
    margin-top: var(--spacing-xs);
    padding-left: 40px;
    padding-right: 20px;
    box-sizing: border-box;
}
.parameter-value-container {
    width: 100%;
    padding-left: 40px;
    padding-right: 20px;
    box-sizing: border-box;
    margin-top: var(--spacing-xs);
    text-align: center;
}
.parameter-value-display {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
    display: inline-block;
}
#get-parameters-btn {
    margin-bottom: 0;
}
.step3-action-row {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    flex-wrap: wrap;
}
#get-parameters-status {
    font-size: var(--font-size-sm);
    color: var(--text-muted, #667);
}
#get-parameters-status.loading,
#stability-status.loading {
    color: #1d4d3e;
}
#get-parameters-status.success,
#stability-status.success {
    color: #28a745;
}
#get-parameters-status.error,
#stability-status.error {
    color: #dc3545;
}

/* ── Stability Analysis (Step 5) ─────────────────────────── */
.stability-section-select {
    margin-bottom: var(--spacing-md);
}
.stability-section-select select {
    width: 100%;
}
.stability-materials,
.stability-search-box {
    border: 1px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background: var(--theme-background);
}
.material-summary {
    margin-top: var(--spacing-sm);
}
.search-box-input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}
.search-box-input-group label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--theme-text);
}
.search-box-input {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--theme-border);
    border-radius: 0;
    font-size: var(--font-size-sm);
    background: white;
    transition: border-color 0.2s ease;
}
.search-box-input:focus {
    outline: none;
    border-color: #1d4d3e;
    box-shadow: 0 0 0 2px rgba(29, 77, 62, 0.1);
}
.stability-controls {
    margin-top: var(--spacing-md);
}
#stability-status {
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-sm);
}
.stability-results {
    border: 1px solid var(--theme-border);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    background: var(--theme-background);
    margin-top: var(--spacing-md);
}
.stability-results table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}
.stability-results th,
.stability-results td {
    border: 1px solid #ddd;
    padding: var(--spacing-xs);
    text-align: left;
}
.stability-results th {
    background: rgba(29, 77, 62, 0.1);
    font-weight: var(--font-weight-semibold);
}
.stability-results tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.5);
}

/* ── Scrollable toggle areas ───────────────────── */
#cs-bh-toggles,
.cs-scrollable-toggles {
    scrollbar-width: thin;
    scrollbar-color: rgba(29, 77, 62, 0.3) transparent;
}
#cs-bh-toggles::-webkit-scrollbar,
.cs-scrollable-toggles::-webkit-scrollbar {
    width: 6px;
}
#cs-bh-toggles::-webkit-scrollbar-track,
.cs-scrollable-toggles::-webkit-scrollbar-track {
    background: transparent;
}
#cs-bh-toggles::-webkit-scrollbar-thumb,
.cs-scrollable-toggles::-webkit-scrollbar-thumb {
    background-color: rgba(29, 77, 62, 0.3);
    border-radius: 3px;
}
#cs-bh-toggles::-webkit-scrollbar-thumb:hover,
.cs-scrollable-toggles::-webkit-scrollbar-thumb:hover {
    background-color: rgba(29, 77, 62, 0.5);
}

/* ── 3-D viewer ────────────────────────────── */
#viz-canvas-wrap {
    position: relative;
    height: 70vh;
    min-height: 520px;
    border: 1px solid var(--theme-border);
    border-radius: var(--border-radius);
    overflow: hidden;
}
#viz-canvas-wrap canvas {
    display: block;
    width: 100%;
    height: 100%;
}
.strata-legend {
    margin-top: var(--spacing-md);
}
.strata-legend .chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: var(--font-size-sm);
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}
.strata-legend .chip span {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 999px;
}

/* ── Section spacing ───────────────────────── */
.section-spacing {
    margin-top: var(--spacing-lg);
}

/* ── Collapsible Step Sections ───────────────── */
.step-toggle {
    user-select: none;
}
.step-content {
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.2s ease, padding 0.3s ease, margin 0.3s ease;
}
.section-panel.collapsed .step-content {
    max-height: 0 !important;
    opacity: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: 0;
    margin-bottom: 0;
    overflow: hidden;
}
.section-panel:not(.collapsed) .step-content {
    max-height: 5000px;
    opacity: 1;
}
.section-panel.collapsed .step-toggle .chevron {
    transform: rotate(-90deg);
}
.content-spacing {
    margin-top: var(--spacing-md);
}
.info-message-spacing {
    margin-top: var(--spacing-md);
}

/* ── Loading states ────────────────────────── */
#cs-loading,
#viz-loading {
    text-align: center;
    padding: var(--spacing-xl);
    display: none;
}
#viz-loading {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--theme-bg);
    z-index: 5;
}

/* ── Empty states ──────────────────────────── */
#no-boreholes-msg {
    margin-top: var(--spacing-sm);
    color: var(--text-muted, #667);
}
#selected-point-text {
    color: var(--text-muted, #667);
    margin-bottom: var(--spacing-sm);
}
.lead-meta {
    margin-bottom: var(--spacing-xs);
}

/* ── Hero section ──────────────────────────── */
.hero-spacing {
    margin-bottom: var(--spacing-md);
}

/* ── Borehole name readonly ────────────────── */
.borehole-name-readonly {
    font-weight: var(--font-weight-semibold);
    color: #1d4d3e;
    margin-bottom: var(--spacing-xs);
    padding: 0.4rem 0.5rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 0;
}

/* ── Drill confirmation modal ───────────────── */
.drill-confirm-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}
.drill-confirm-modal.active {
    display: flex;
}
.drill-confirm-content {
    background: var(--theme-bg, #fff);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    max-width: 400px;
    width: 90%;
    box-shadow: none;
}
.drill-confirm-content h3 {
    margin-top: 0;
    margin-bottom: var(--spacing-md);
    color: var(--theme-text);
}
.drill-confirm-content p {
    margin-bottom: var(--spacing-md);
    color: var(--text-muted, #667);
}
.drill-confirm-actions {
    display: flex;
    gap: var(--spacing-xs);
    justify-content: flex-end;
}

/* ── Drilled borehole state ────────────────── */
.borehole-config-card.drilled {
    border-color: rgba(29, 77, 62, 0.4);
    background: var(--theme-background);
}

/* ── Collapsible borehole cards ──────────────── */
.borehole-card-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    width: 100%;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 0;
    transition: background-color 0.2s ease;
    margin-bottom: var(--spacing-xs);
}
.borehole-card-toggle:hover {
    background-color: rgba(29, 77, 62, 0.08);
}
.borehole-card-toggle i {
    transition: transform 0.2s ease;
    font-size: var(--font-size-sm);
    color: var(--theme-text);
    flex-shrink: 0;
}
.borehole-card-toggle.collapsed i {
    transform: rotate(-90deg);
}
.borehole-card-content {
    overflow: hidden;
    transition: max-height 0.3s ease, opacity 0.2s ease, padding 0.3s ease, margin 0.3s ease;
}
.borehole-config-card.collapsed .borehole-card-content {
    max-height: 0 !important;
    opacity: 0;
    padding-top: 0;
    padding-bottom: 0;
    margin-top: 0;
    margin-bottom: 0;
}
.borehole-config-card:not(.collapsed) .borehole-card-content {
    max-height: 2000px;
    opacity: 1;
}
.borehole-card-chip {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex: 1;
    min-width: 0;
}
.borehole-card-chip .borehole-name-readonly {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ── Disabled depth controls ────────────────── */
.borehole-config-card.drilled .depth-config-row {
    opacity: 0.6;
    pointer-events: none;
}
.borehole-config-card.drilled .depth-config-row input,
.borehole-config-card.drilled .depth-config-row input[type="range"] {
    cursor: not-allowed;
}

/* ── Drill results section ─────────────────── */
.drill-results-section {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--theme-border);
}
.drill-results-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
    margin-bottom: var(--spacing-xs);
}
.drill-results-toggle:hover {
    color: #1d4d3e;
}
.drill-results-content {
    display: none;
    margin-top: var(--spacing-sm);
}
.drill-results-content.expanded {
    display: block;
}
.drill-results-grid {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    align-items: flex-start;
}
@media (max-width: 768px) {
    .drill-results-grid {
        flex-direction: column;
    }
}
.drill-results-merged-card {
    border: 1px solid var(--theme-border);
    border-radius: 0;
    padding: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.6);
    flex: 1;
    display: flex;
    flex-direction: column;
}
.drill-results-merged-title,
.drill-unit-viz-title,
.drill-plot-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--theme-text);
}
.drill-unit-viz {
    flex: 0 0 auto;
}
.drill-unit-legend,
.drill-plot-legend {
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}
.drill-unit-legend-item,
.drill-plot-legend-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.drill-unit-legend-item span {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 2px;
}
.drill-plot-container {
    flex: 2 1 auto;
    display: flex;
    flex-direction: column;
}
.drill-plot-legend-item span {
    display: inline-block;
    width: 12px;
    height: 2px;
    background: currentColor;
}
.drill-plot-container {
    position: relative;
}
.drill-plot-tooltip {
    position: absolute;
    background: rgba(0, 0, 0, 0.85);
    color: #fff;
    padding: 4px 8px;
    border-radius: 0;
    font-size: var(--font-size-xs);
    pointer-events: none;
    z-index: 1000;
    white-space: nowrap;
    display: none;
    box-shadow: none;
}
.drill-plot-tooltip.visible {
    display: block;
}

/* ── Research Submission (End-of-session) ─────────────── */
.research-finalize-wrap {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--theme-border);
}
.research-modal {
    position: fixed;
    inset: 0;
    background: rgba(20, 24, 22, 0.55);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 3000;
    padding: var(--spacing-md);
}
.research-modal.active {
    display: flex;
}
.research-modal-card {
    width: min(860px, 98vw);
    max-height: 92vh;
    overflow: auto;
    background: #ffffff;
    border-radius: 0;
    border: 1px solid var(--theme-border);
    box-shadow: none;
    padding: var(--spacing-lg);
}
.research-modal-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}
.research-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.research-field label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--theme-text);
}
.research-field select,
.research-field input,
.research-field textarea {
    border: 1px solid var(--theme-border);
    border-radius: 0;
    padding: 8px 10px;
    font-size: var(--font-size-sm);
}
.research-field textarea {
    min-height: 70px;
    resize: vertical;
}
.research-summary {
    background: #f5f5f5;
    border: 1px solid var(--theme-border);
    border-radius: 0;
    padding: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--theme-text);
}
.research-action-row {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    align-items: center;
    margin-top: var(--spacing-md);
}
.research-muted {
    color: var(--theme-secondary-mid);
    font-size: var(--font-size-sm);
}
.research-recovery-toast {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 3100;
    max-width: 420px;
    background: #ffffff;
    border: 1px solid var(--theme-border);
    border-left: 4px solid #1d4d3e;
    border-radius: 0;
    box-shadow: none;
    padding: 12px;
    display: none;
}
.research-recovery-toast.active {
    display: block;
}
.research-recovery-actions {
    margin-top: 10px;
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
@media (max-width: 860px) {
    .research-modal-grid {
        grid-template-columns: 1fr;
    }
}