*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, sans-serif;
    background: #f5f5f5;
    color: #222;
    display: flex;
    flex-direction: column;
    min-height: 100dvh;
}

header {
    padding: 0.75rem 1rem;
    background: #fff;
    border-bottom: 1px solid #ddd;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

h1 {
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
    margin-right: 0.5rem;
}

.updated-label {
    margin-left: auto;
    font-size: 0.75rem;
    color: #888;
    white-space: nowrap;
}

.date-range {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.control-group label {
    font-size: 0.8rem;
    color: #555;
    white-space: nowrap;
}

.control-group input[type="date"] {
    font-size: 0.85rem;
    padding: 0.25rem 0.4rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    background: #fff;
    color: #222;
}

/* Bucket toggle — radio buttons styled as a button group */
.btn-group {
    display: flex;
    border: 1px solid #ccc;
    border-radius: 4px;
    overflow: hidden;
}

.btn-group input[type="checkbox"] {
    display: none;
}

.btn-group label {
    padding: 0.25rem 0.7rem;
    font-size: 0.85rem;
    cursor: pointer;
    background: #fff;
    color: #444;
    border-right: 1px solid #ccc;
    user-select: none;
    transition: background 0.15s, color 0.15s;
}

.btn-group label:last-child,
.btn-group button:last-child {
    border-right: none;
}

.btn-group button {
    padding: 0.25rem 0.7rem;
    font-size: 0.85rem;
    cursor: pointer;
    background: #fff;
    color: #444;
    border: none;
    border-right: 1px solid #ccc;
    user-select: none;
    transition: background 0.15s, color 0.15s;
    line-height: inherit;
    font-family: inherit;
}

.btn-group button:hover {
    background: #f0f4f8;
    color: #222;
}

.btn-group input[type="checkbox"]:checked+label {
    background: #3b82f6;
    color: #fff;
}

/* Cumsum checkbox */
.cumsum-control {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
}

.cumsum-control input[type="checkbox"] {
    width: 1rem;
    height: 1rem;
    cursor: pointer;
    accent-color: #3b82f6;
}

/* Chart area */
main {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.chart-container {
    height: 500px;
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    padding: 0;
    position: relative;
    min-height: 80px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.chart-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.45rem 0.75rem;
    border-bottom: 1px solid #eee;
    flex-shrink: 0;
    gap: 0.5rem;
}

.chart-title {
    font-size: 0.78rem;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chart-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-left: auto;
    flex-shrink: 0;
}

.info-btn,
.export-btn {
    flex-shrink: 0;
    width: 1.35rem;
    height: 1.35rem;
    padding: 0;
    border: none;
    background: none;
    color: #94a3b8;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.15s, background 0.15s;
}

.info-btn:hover,
.info-btn[aria-expanded="true"],
.export-btn:hover {
    color: #3b82f6;
    background: #eff6ff;
}

.export-btn--copied {
    color: #22c55e;
}

.info-panel {
    display: none;
    position: absolute;
    inset: 0;
    z-index: 10;
    background: rgba(255, 255, 255, 0.96);
    padding: 1.25rem 1.5rem;
    overflow-y: auto;
    font-size: 0.85rem;
    line-height: 1.6;
    color: #333;
}

.info-panel--open {
    display: block;
}

.info-panel p {
    margin: 0 0 0.75rem;
}

.info-panel p:last-child {
    margin-bottom: 0;
}

.chart-body {
    flex: 1;
    position: relative;
    min-height: 0;
    padding: 0.75rem;
}

/* Draggable resize handle */
.chart-resizer {
    height: 10px;
    cursor: row-resize;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 3px;
}

.chart-resizer::after {
    content: '';
    width: 48px;
    height: 4px;
    border-radius: 2px;
    background: #d1d5db;
    transition: background 0.15s;
}

.chart-resizer:hover::after,
.chart-resizer.dragging::after {
    background: #3b82f6;
}

.chart-body canvas {
    width: 100% !important;
    height: 100% !important;
}

/* Monthly stats table */
.table-container {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 6px;
    overflow-x: auto;
}

.table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table-title {
    font-size: 0.8rem;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    padding: 0.55rem 0.75rem 0.2rem;
    margin: 0;
}

#stats-table,
#gap-table {
    width: 100%;
    min-width: 640px;
    font-size: 0.85rem;
    table-layout: max-content;
}

#stats-table th,
#stats-table td,
#gap-table th,
#gap-table td {
    padding: 0.45rem 0.75rem;
    text-align: right;
    white-space: nowrap;
}

#stats-table th:nth-child(1),
#stats-table th:nth-child(2),
#stats-table td.col-label,
#gap-table th:nth-child(1),
#gap-table th:nth-child(2),
#gap-table td.col-label {
    text-align: left;
}

#stats-table thead th,
#gap-table thead th {
    background: #f0f4f8;
    font-weight: 600;
    border-bottom: 2px solid #ddd;
    color: #444;
}

/* Small-screen header: stack each control row on its own line */
@media (max-width: 600px) {

    header h1,
    header .date-range {
        flex-basis: 100%;
    }

    header .btn-group {
        align-self: start;
        width: fit-content;
    }

    .date-range {
        flex-wrap: nowrap;
    }

    .updated-label {
        margin-left: 0;
    }
}

#stats-table tbody tr:nth-child(even),
#gap-table tbody tr:nth-child(even) {
    background: #f9fafb;
}

#stats-table tbody tr:hover,
#gap-table tbody tr:hover {
    background: #eef2ff;
}

#stats-table tbody td,
#gap-table tbody td {
    border-bottom: 1px solid #eee;
    color: #333;
}

#stats-table .count,
#gap-table .count {
    font-size: 0.8em;
    color: #888;
}

#stats-table tbody tr.year-total-row td,
#gap-table tbody tr.year-total-row td {
    border-top: 1px solid #ccc;
    font-style: italic;
    background: #f5f7fa;
    color: #555;
}

#stats-table tbody tr.total-row td,
#gap-table tbody tr.total-row td {
    border-top: 2px solid #bbb;
    font-weight: 600;
    background: #f0f4f8;
}

/* Empty state */
#empty-msg[hidden] {
    display: none;
}

#empty-msg {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    color: #888;
    pointer-events: none;
}