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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f5f7fa;
    color: #1a1a2e;
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px 30px;
}

h1 {
    font-size: 1.8rem;
    margin-bottom: 4px;
    color: #1a1a2e;
}

.subtitle {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.country-select {
    margin-bottom: 16px;
}

.country-select select {
    padding: 6px 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.95rem;
    min-width: 200px;
}

#loading {
    text-align: center;
    padding: 60px;
    font-size: 1.2rem;
    color: #888;
}

/* Toolbar */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    flex-wrap: wrap;
    gap: 8px;
}

.timeframe-buttons {
    display: flex;
    gap: 4px;
    flex-wrap: wrap;
}

.timeframe-buttons button,
.export-buttons button {
    padding: 6px 14px;
    border: 1px solid #ccc;
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.15s;
}

.timeframe-buttons button:hover,
.export-buttons button:hover {
    background: #e8edf2;
}

.timeframe-buttons button.active {
    background: #2c5282;
    color: #fff;
    border-color: #2c5282;
}

.nav-buttons {
    display: flex;
    gap: 4px;
}

.nav-buttons button {
    padding: 6px 12px;
    border: 1px solid #ccc;
    background: #fff;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.15s;
}

.nav-buttons button:hover {
    background: #e8edf2;
}

.export-buttons {
    display: flex;
    gap: 4px;
}

/* Chart */
.chart-container {
    position: relative;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
}

#chart {
    width: 100%;
    display: block;
}

.tooltip {
    display: none;
    position: absolute;
    background: rgba(26, 26, 46, 0.92);
    color: #fff;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.82rem;
    pointer-events: none;
    white-space: nowrap;
    z-index: 10;
    line-height: 1.5;
}

/* Selection overlay */
.selection-rect {
    fill: rgba(44, 82, 130, 0.15);
    stroke: rgba(44, 82, 130, 0.5);
    stroke-width: 1;
}

/* Settings panel */
.settings-panel {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
}

.settings-panel summary {
    padding: 14px 20px;
    cursor: pointer;
    background: #f8f9fb;
    border-bottom: 1px solid #eee;
    user-select: none;
}

.settings-panel summary h2 {
    display: inline;
    font-size: 1.1rem;
    font-weight: 600;
}

.settings-panel summary:hover {
    background: #eef1f5;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    padding: 20px;
}

.setting-group h3 {
    font-size: 0.95rem;
    color: #444;
    margin-bottom: 12px;
    border-bottom: 1px solid #eee;
    padding-bottom: 6px;
}

.setting-group label {
    display: block;
    font-size: 0.85rem;
    color: #555;
    margin-bottom: 10px;
}

.setting-group input[type="number"] {
    display: block;
    width: 100%;
    margin-top: 4px;
    padding: 6px 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.9rem;
}

.setting-group input.computed {
    background: #f0f4f8;
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 6px;
    flex-direction: row !important;
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.btn-primary {
    margin: 0 20px 20px;
    padding: 10px 28px;
    background: #2c5282;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background 0.15s;
}

.btn-primary:hover {
    background: #1e3a5f;
}

/* Results table */
#resultsTable {
    padding: 20px;
}

#resultsTable table {
    width: 100%;
    border-collapse: collapse;
}

#resultsTable th,
#resultsTable td {
    padding: 8px 14px;
    text-align: right;
    border-bottom: 1px solid #eee;
    font-size: 0.9rem;
}

#resultsTable th {
    text-align: right;
    font-weight: 600;
    color: #444;
    border-bottom: 2px solid #ccc;
}

#resultsTable th:first-child,
#resultsTable td:first-child {
    text-align: left;
}

#resultsTable tr:hover {
    background: #f8f9fb;
}

#resultsTable tr.total-row {
    font-weight: 600;
    border-top: 2px solid #999;
}

#resultsTable tr.total-row td {
    border-bottom: none;
}

/* Legend */
.legend {
    display: flex;
    gap: 18px;
    padding: 8px 0 4px;
    font-size: 0.82rem;
    color: #555;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 5px;
}

.legend-swatch {
    width: 14px;
    height: 14px;
    border-radius: 3px;
}

/* Payback controls */
.payback-controls {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 14px 20px;
    background: #f8f9fb;
    border-bottom: 1px solid #eee;
    flex-wrap: wrap;
    font-size: 0.85rem;
    color: #555;
}

.payback-controls select,
.payback-controls input[type="number"] {
    padding: 4px 8px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 0.85rem;
    width: 90px;
}

.payback-controls .computed-hint {
    color: #2c5282;
    font-weight: 600;
    font-size: 0.85rem;
}

/* Payback analysis */
#paybackAnalysis {
    padding: 20px;
}

#paybackAnalysis .payback-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}

#paybackAnalysis .payback-card {
    background: #f8f9fb;
    border-radius: 8px;
    padding: 16px;
    text-align: center;
}

#paybackAnalysis .payback-card .value {
    font-size: 1.6rem;
    font-weight: 700;
    color: #2c5282;
}

#paybackAnalysis .payback-card .label {
    font-size: 0.82rem;
    color: #666;
    margin-top: 4px;
}

#paybackAnalysis .payback-card.warn .value {
    color: #c53030;
}

#paybackAnalysis .payback-card.ok .value {
    color: #276749;
}

/* Intro & methodology content */
.intro-content {
    padding: 16px 20px;
    font-size: 0.9rem;
    line-height: 1.7;
    color: #333;
}

.intro-content p {
    margin-bottom: 12px;
}

.intro-content ul,
.intro-content ol {
    margin: 0 0 12px 20px;
}

.intro-content li {
    margin-bottom: 6px;
}

.intro-content h3 {
    font-size: 0.95rem;
    color: #2c5282;
    margin: 18px 0 8px;
}

.intro-content h3:first-child {
    margin-top: 4px;
}

.intro-content a {
    color: #2c5282;
    text-decoration: underline;
}

.intro-panel {
    margin-bottom: 20px;
}

.methodology-panel {
    margin-top: 20px;
}

/* Axis styles */
.axis text {
    font-size: 11px;
    fill: #666;
}

.axis line,
.axis path {
    stroke: #ccc;
}

.grid line {
    stroke: #eee;
    stroke-dasharray: 2,3;
}

.grid path {
    stroke: none;
}