:root {
    --bg: #ffffff;
    --surface: #ffffff;
    --panel: #f8fafc;
    --border: #d0d7e2;
    --muted: #6b7280;
    --text: #111827;
    --accent: #2563eb;
    --accent-strong: #1d4ed8;
    --danger: #dc2626;
    --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
    --radius: 12px;
    --glow: 0 10px 26px rgba(37, 99, 235, 0.18);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1500px;
    margin: 0 auto;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* Header */
.header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 24px 26px;
}

.header__row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 28px;
    flex-wrap: wrap;
}

.header__copy {
    max-width: 820px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.header__eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
}

.header h1 {
    font-size: 32px;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.header__lead {
    font-size: 16px;
    color: var(--muted);
    line-height: 1.6;
    font-weight: 400;
}

.header__meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 6px;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--panel);
    border: 1px solid var(--border);
    color: var(--muted);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.pill--accent {
    background: linear-gradient(90deg, var(--accent), var(--accent-strong));
    color: #fff;
    border-color: transparent;
    box-shadow: var(--glow);
}

.pill--ghost {
    background: rgba(37, 99, 235, 0.07);
    color: var(--accent);
    border-color: rgba(37, 99, 235, 0.2);
}

.header__stats {
    min-width: 260px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 10px;
}

.stat-chip {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
}

.stat-chip__label {
    font-size: 12px;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 600;
}

.stat-chip__value {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent);
}

/* Control Panel */
.control-panel {
    background: #fbfcff;
    padding: 20px 26px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.control-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.control-bar__hint {
    color: var(--muted);
    font-size: 14px;
    line-height: 1.4;
    font-weight: 400;
}

.control-panel__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 16px;
}

.controls-section {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.section-title {
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--muted);
    letter-spacing: 0.08em;
    margin-bottom: 4px;
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.control-actions {
    flex-direction: row;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

label {
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    letter-spacing: 0.01em;
}

input[type="file"],
input[type="number"],
input[type="range"],
select {
    padding: 10px 12px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    background: var(--surface);
    transition: all 0.2s ease;
    color: var(--text);
}

input[type="file"]:hover,
input[type="number"]:hover,
select:hover {
    border-color: var(--accent);
}

input[type="file"]:focus,
input[type="number"]:focus,
select:focus,
input[type="range"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

input[type="range"] {
    padding: 0;
}

select {
    cursor: pointer;
}

button {
    padding: 10px 16px;
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    background: var(--surface);
    color: var(--text);
    letter-spacing: 0.01em;
}

button:hover {
    background: #eef2ff;
    border-color: var(--accent);
}

button:active {
    transform: translateY(1px);
}

button.btn-primary {
    background: linear-gradient(90deg, var(--accent), var(--accent-strong));
    color: #fff;
    border: 1px solid var(--accent);
    box-shadow: var(--glow);
}

button.btn-primary:hover {
    background: linear-gradient(90deg, #1d4ed8, #1e40af);
    border-color: #1d4ed8;
}

button.btn-secondary {
    background: var(--panel);
    color: var(--accent);
    border-color: var(--border);
}

button.btn-secondary:hover {
    border-color: var(--accent);
}

button.btn-danger {
    background: linear-gradient(90deg, #ef4444, #dc2626);
    color: #fff;
    border: none;
    box-shadow: 0 10px 26px rgba(220, 38, 38, 0.2);
}

/* View Tabs */
.view-tabs {
    display: flex;
    gap: 10px;
    padding: 14px 30px;
    background: var(--panel);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
}

.view-tab {
    padding: 10px 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.view-tab:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.view-tab.active {
    color: #fff;
    background: linear-gradient(90deg, var(--accent), var(--accent-strong));
    border-color: var(--accent);
    box-shadow: var(--glow);
}

/* View Sections */
.view-section {
    padding: 26px 30px;
    background: var(--surface);
}

.view-section[data-view]:not([data-view="overview"]) {
    display: none;
}

/* Quick Suburb Selection */
.quick-suburb-selection-row {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    margin-bottom: 20px;
    width: 100%;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
}

.region-groups {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin: 15px 0;
}

.region-group h4 {
    font-size: 14px;
    color: var(--muted);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border);
    font-weight: 600;
}

.region-checkboxes {
    display: grid;
    gap: 10px;
}

.region-checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.region-checkbox-item label {
    font-size: 14px;
    color: var(--text);
    text-transform: none;
    letter-spacing: normal;
    cursor: pointer;
}

.region-controls {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Main Visualizations Layout */
.main-visualizations-layout {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 24px;
    margin-top: 14px;
}

.sidebar-panel {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    height: fit-content;
    max-height: 650px;
    overflow-y: auto;
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

.unbucketed-group {
    margin-top: 12px;
    padding: 12px;
    border-top: 1px dashed var(--border);
    background: #f8fafc;
    border-radius: 10px;
}

.unbucketed-group h4 {
    font-size: 13px;
    margin-bottom: 6px;
    color: var(--muted);
}

#unbucketedCheckboxes {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 8px;
}

/* Visualization Display Controls */
.viz-display-controls {
    margin-bottom: 12px;
}

.viz-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.viz-tab {
    padding: 8px 12px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.viz-tab.active {
    background: linear-gradient(90deg, var(--accent), var(--accent-strong));
    color: #fff;
    border-color: var(--accent);
    box-shadow: var(--glow);
}

.tabbed-visualizations .viz-container {
    margin-bottom: 0;
}

.visualization-area {
    flex: 1;
}

#split-view {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(450px, 1fr));
    gap: 24px;
}

/* Visualizations Grid */
.visualizations {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(640px, 1fr));
    gap: 24px;
    flex: 1;
}

.viz-container {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
    background: var(--surface);
    transition: all 0.25s ease;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.05);
}

.viz-container:hover {
    border-color: var(--accent);
    box-shadow: 0 16px 38px rgba(37, 99, 235, 0.12);
    transform: translateY(-2px);
}

.viz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    gap: 10px;
}

.viz-title {
    font-size: 18px;
    font-weight: 600;
}

.viz-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.viz-controls select {
    padding: 6px 10px;
    font-size: 13px;
}

/* SVG Styles */
svg {
    display: block;
    margin: 0 auto;
}

.point {
    stroke: #334155;
    stroke-width: 0.5;
    cursor: pointer;
    transition: all 0.2s;
}

.point:hover {
    stroke-width: 2;
    stroke: #0f172a;
    filter: brightness(1.2);
}

.point.selected {
    stroke: #ef4444 !important;
    stroke-width: 3 !important;
    r: 6 !important;
    filter: brightness(1.3);
}

.axis-label {
    font-size: 13px;
    font-weight: 600;
    fill: #0f172a;
}

.x-axis, .y-axis {
    font-size: 11px;
}

.x-axis line, .y-axis line {
    stroke: #cbd5e1;
}

.x-axis path, .y-axis path {
    stroke: #94a3b8;
}

.ternary-triangle {
    fill: none;
    stroke: #0f172a;
    stroke-width: 2;
}

.pareto-line {
    fill: none;
    stroke: #0ea5e9;
    stroke-width: 3;
    stroke-dasharray: 5,5;
}

.cluster-hull {
    pointer-events: none;
}

.heatmap-cell {
    cursor: pointer;
}

.parallel-line {
    cursor: pointer;
}

.centroid {
    cursor: pointer;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

/* Legend */
.legend {
    margin-top: 12px;
    padding: 14px;
    background: var(--panel);
    border-radius: 10px;
    border: 1px solid var(--border);
}

.legend-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.legend-scale {
    display: flex;
    align-items: center;
    gap: 10px;
}

.legend-gradient {
    width: 100%;
    max-width: 320px;
    height: 14px;
    border-radius: 4px;
    border: 1px solid var(--border);
}

.legend-labels {
    display: flex;
    justify-content: space-between;
    font-size: 11px;
    color: var(--muted);
    margin-top: 5px;
}

/* Info Panels */
.info-panel {
    margin-top: 12px;
    padding: 14px;
    background: var(--surface);
    border-radius: 10px;
    border: 1px solid var(--border);
    font-size: 13px;
    line-height: 1.6;
    min-height: 80px;
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.06);
}

.info-panel h4 {
    margin-bottom: 8px;
    color: var(--accent);
    font-size: 15px;
    font-weight: 600;
}

.info-panel p {
    margin-bottom: 4px;
}

.info-panel strong {
    color: var(--text);
    font-weight: 600;
}

/* Statistics Panel */
#statisticsPanel {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(37, 99, 235, 0.02) 100%);
    padding: 18px;
    border-radius: var(--radius);
    margin-bottom: 18px;
    border: 1px solid var(--border);
}

#statisticsPanel h3 {
    font-size: 20px;
    color: var(--text);
    margin-bottom: 12px;
    font-weight: 600;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
    gap: 12px;
}

.stat-item {
    background: var(--surface);
    padding: 12px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 8px 18px rgba(15, 23, 42, 0.05);
    border: 1px solid var(--border);
}

.stat-label {
    font-size: 12px;
    color: var(--muted);
    font-weight: 600;
}

.stat-value {
    font-size: 16px;
    color: var(--accent);
    font-weight: 600;
}

/* Tooltip */
.tooltip {
    position: absolute;
    padding: 10px 12px;
    background: rgba(15, 23, 42, 0.94);
    color: white;
    border-radius: 10px;
    font-size: 12px;
    line-height: 1.5;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 1000;
    max-width: 320px;
    box-shadow: 0 12px 30px rgba(0,0,0,0.35);
}

.tooltip strong {
    color: #fff;
    font-size: 13px;
    display: block;
    margin-bottom: 4px;
}

/* Selection history */
.selection-history {
    margin-top: 28px;
    background: var(--surface);
    border-radius: 14px;
    padding: 18px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.06);
    border: 1px solid var(--border);
}

.history-header {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.history-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
}

.history-header p {
    margin: 4px 0 0;
    color: var(--muted);
    font-size: 14px;
}

.history-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.history-table-wrapper {
    overflow-x: auto;
}

.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.history-table th,
.history-table td {
    padding: 10px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.history-table th {
    background: var(--panel);
    font-weight: 600;
    color: var(--text);
}

.history-table .action-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.history-table .tag {
    display: inline-flex;
    padding: 4px 8px;
    border-radius: 20px;
    background: #eef2ff;
    color: #1d4ed8;
    font-weight: 600;
    font-size: 12px;
}

.history-table .empty-row td {
    text-align: center;
    color: var(--muted);
    font-style: italic;
}

/* Notifications */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 14px 18px;
    border-radius: 12px;
    color: white;
    font-weight: 600;
    box-shadow: 0 12px 28px rgba(0,0,0,0.2);
    z-index: 2000;
    opacity: 0;
    transform: translateX(400px);
    transition: all 0.3s ease;
}

.notification.show {
    opacity: 1;
    transform: translateX(0);
}

.notification-success { background: #10b981; }
.notification-error { background: #ef4444; }
.notification-info { background: #2563eb; }
.notification-warning { background: #fbbf24; color: #0f172a; }

/* Checkbox Styles */
input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--accent);
}

/* Toggle Label Styles */
.toggle-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    text-transform: none;
    letter-spacing: normal;
    color: var(--text);
}

.info-text {
    font-size: 12px;
    color: var(--muted);
    margin-top: 4px;
    font-style: italic;
}

/* Responsive */
@media (max-width: 1200px) {
    .visualizations {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .container {
        border-radius: 12px;
    }

    .header {
        padding: 20px;
    }

    .header h1 {
        font-size: 26px;
    }

    .control-panel {
        padding: 16px;
    }

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

    .view-section {
        padding: 16px;
    }

    .visualizations {
        gap: 18px;
    }

    svg {
        max-width: 100%;
        height: auto;
    }
}

/* Suburb Filter Styles */
.suburb-filter {
    max-width: 100% !important;
}

.region-presets {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
}

.region-btn {
    padding: 6px 12px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 10px;
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
    text-transform: none;
    letter-spacing: normal;
    cursor: pointer;
}

.region-btn:hover {
    background: #eef2ff;
    border-color: var(--accent);
}

.region-btn.active {
    background: linear-gradient(90deg, var(--accent), var(--accent-strong));
    color: white;
    border-color: var(--accent);
}

.suburb-search {
    margin-bottom: 10px;
}

.suburb-search input {
    width: 100%;
    padding: 8px 12px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 14px;
    background: var(--surface);
    color: var(--text);
}

.suburb-search input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18);
}

.suburb-checkboxes {
    max-height: 300px;
    overflow-y: auto;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    padding: 10px;
    background: var(--surface);
}

.suburb-checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: 8px;
    cursor: pointer;
}

.suburb-checkbox-item:hover {
    background: #f8fafc;
}

.suburb-checkbox-item label {
    cursor: pointer;
    text-transform: none;
    letter-spacing: normal;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(37, 99, 235, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #e5e7eb;
}

::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 8px;
}

::-webkit-scrollbar-thumb:hover {
    background: #64748b;
}