/* /rule-changes/: the concept by year heat map */
:root { --h4: 55%; --h5: 85%; }
@media (prefers-color-scheme: light) { :root:not([data-theme="dark"]) { --h4: 85%; --h5: 100%; } }
:root[data-theme="light"] { --h4: 85%; --h5: 100%; }
:root[data-theme="dark"] { --h4: 55%; --h5: 85%; }
.ch-ctl { display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-5); margin: 0 0 var(--space-2); }
.ch-ctl label { display: flex; flex-direction: column; gap: var(--space-1); font-weight: 700; flex: 1 1 14rem; min-width: 0; max-width: 24rem; }
.ch-ctl select { min-height: var(--space-target); width: 100%; }
.ch-status { min-height: 1.5em; }
.ch-key ul { list-style: none; padding: 0; margin: 0 0 var(--space-2); display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-4); }
.ch-key li { display: flex; align-items: center; gap: var(--space-2); margin: 0; }
.ch-sw { display: inline-flex; align-items: center; justify-content: center; width: 3.25rem; height: 1.75rem; font-size: var(--text-small); font-weight: 700; border: 1px solid var(--c-line); border-radius: var(--radius-focus); }
.ch-scroll { contain: paint; overflow: auto; max-width: 100%; max-height: 80vh; margin: 0 0 var(--space-5); border: 1px solid var(--c-line); border-radius: var(--radius-card); }
.ch-grid, .ch-tab { border-collapse: separate; border-spacing: 0; font-size: var(--text-small); }
.ch-grid caption, .ch-tab caption { text-align: left; padding: var(--space-3); color: var(--c-muted); position: sticky; left: 0; }
.ch-grid th, .ch-grid td { border-top: 1px solid var(--c-line); padding: 0; text-align: center; }
.ch-grid thead th { position: sticky; top: 0; z-index: 2; background: var(--c-surface2); color: var(--c-fg); height: 3.75rem; vertical-align: bottom; padding-bottom: var(--space-1); }
.ch-grid thead th:first-child { left: 0; z-index: 3; text-align: left; padding-left: var(--space-2); vertical-align: middle; }
.ch-grid tbody th { position: sticky; left: 0; z-index: 1; background: var(--c-surface); text-align: left; font-weight: 600; padding: var(--space-1) var(--space-2); min-width: 9.5rem; max-width: 12rem; border-right: 1px solid var(--c-line); line-height: var(--leading-tight); }
.ch-yr { writing-mode: vertical-rl; transform: rotate(180deg); font-variant-numeric: tabular-nums; }
.ch-grid td { min-width: 2.1rem; height: 2rem; font-variant-numeric: tabular-nums; color: var(--c-fg); border-left: 1px solid var(--c-surface2); }
.h-x { background: var(--c-surface); }
.h0 { background: var(--c-surface2); color: var(--c-muted); }
.h1 { background: color-mix(in srgb, var(--c-accent) 12%, var(--c-surface)); }
.h2 { background: color-mix(in srgb, var(--c-accent) 25%, var(--c-surface)); }
.h3 { background: color-mix(in srgb, var(--c-accent) 40%, var(--c-surface)); font-weight: 700; }
.h4 { background: color-mix(in srgb, var(--c-accent) var(--h4), var(--c-surface)); color: var(--c-accentFg); font-weight: 700; }
.h5 { background: color-mix(in srgb, var(--c-accent) var(--h5), var(--c-surface)); color: var(--c-accentFg); font-weight: 800; box-shadow: inset 0 0 0 2px var(--c-accentFg); }
.ch-grid td.h4, .ch-grid td.h5 { color: var(--c-accentFg); }
.ch-tab th, .ch-tab td { border-top: 1px solid var(--c-line); padding: var(--space-2) var(--space-3); text-align: left; vertical-align: top; }
.ch-tab thead th { background: var(--c-surface2); position: sticky; top: 0; }
.ch-tab tbody th { font-weight: 600; background: var(--c-surface); position: sticky; left: 0; min-width: 9rem; }
.ch-tab td { text-align: right; font-variant-numeric: tabular-nums; }
#ch-sum td:nth-last-child(-n+2) { text-align: left; min-width: 14rem; }