.metric-explain {
  position: relative;
  cursor: help;
  outline: none;
}

.metric-explain::after {
  content: "ƒx";
  position: absolute;
  inset-block-start: 8px;
  inset-inline-end: 9px;
  color: var(--acc, #34e2c4);
  font: 700 10px/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: -.04em;
  opacity: .72;
}

.metric-explain:hover,
.metric-explain:focus-visible,
.metric-explain[aria-expanded="true"] {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--acc, #34e2c4) 58%, transparent);
}

.metric-explain:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--acc, #34e2c4) 68%, transparent);
  outline-offset: 2px;
}

.metric-explain-popover {
  position: fixed;
  z-index: 10020;
  width: min(460px, calc(100vw - 20px));
  max-height: min(560px, calc(100vh - 20px));
  overflow: auto;
  padding: 0;
  color: var(--txt, #eef5ff);
  background: color-mix(in srgb, var(--panel, #111d2d) 96%, #000 4%);
  border: 1px solid color-mix(in srgb, var(--acc, #34e2c4) 45%, var(--line, #304159));
  border-radius: 12px;
  box-shadow: 0 18px 46px rgba(0, 0, 0, .34);
  font-size: 13px;
  line-height: 1.5;
  pointer-events: none;
}

.metric-explain-popover.pinned { pointer-events: auto; }
.metric-explain-popover[hidden] { display: none; }

.metric-explain-head,
.metric-explain-title,
.metric-explain-section,
.metric-explain-meta { padding: 11px 14px; }

.metric-explain-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--acc, #34e2c4);
  border-bottom: 1px solid var(--line, #304159);
  font: 700 10px/1.2 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.metric-explain-head button {
  display: none;
  width: 28px;
  height: 28px;
  margin: -6px -7px -6px 8px;
  border: 0;
  border-radius: 7px;
  color: var(--txt2, #b8c4d8);
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.metric-explain-popover.pinned .metric-explain-head button { display: inline-grid; place-items: center; }
.metric-explain-head button:hover { background: var(--panel2, #17253a); color: var(--txt, #eef5ff); }

.metric-explain-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line, #304159);
}

.metric-explain-title strong { font-size: 15px; }
.metric-explain-title span { color: var(--txt2, #b8c4d8); font: 700 13px/1.3 ui-monospace, "SFMono-Regular", Consolas, monospace; text-align: end; }
.metric-explain-section > b,
.metric-explain-meta b { display: block; margin-bottom: 6px; color: var(--txt3, #8da0ba); font-size: 11px; font-weight: 650; }

.metric-explain-section > code {
  display: block;
  padding: 9px 10px;
  overflow-wrap: anywhere;
  color: var(--txt, #eef5ff);
  background: color-mix(in srgb, var(--bg, #09111e) 68%, transparent);
  border-inline-start: 2px solid var(--acc, #34e2c4);
  border-radius: 6px;
  font: 600 12px/1.55 ui-monospace, "SFMono-Regular", Consolas, monospace;
  white-space: normal;
}

.metric-driver-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px; }
.metric-driver {
  display: grid;
  grid-template-columns: 16px 1fr auto;
  align-items: baseline;
  gap: 4px;
  padding: 7px 8px;
  background: color-mix(in srgb, var(--panel2, #17253a) 72%, transparent);
  border-radius: 7px;
}
.metric-driver i { color: var(--txt3, #8da0ba); font-style: normal; }
.metric-driver.up i { color: var(--good, #4ade80); }
.metric-driver.down i { color: var(--bad, #ff6b6b); }
.metric-driver strong { min-width: 0; overflow-wrap: anywhere; font-size: 11px; }
.metric-driver em { color: var(--txt, #eef5ff); font: 700 11px/1.3 ui-monospace, "SFMono-Regular", Consolas, monospace; font-style: normal; }
.metric-driver small { grid-column: 2 / -1; color: var(--txt3, #8da0ba); font-size: 10px; }

.metric-explain-meta {
  display: grid;
  gap: 10px;
  background: color-mix(in srgb, var(--panel2, #17253a) 38%, transparent);
  border-top: 1px solid var(--line, #304159);
}
.metric-explain-meta span { display: block; color: var(--txt2, #b8c4d8); }
.metric-explain-meta code { display: inline-block; margin-top: 5px; color: var(--acc, #34e2c4); font-size: 10px; }
.metric-explain-meta ul { margin: 0; padding-inline-start: 18px; color: var(--txt2, #b8c4d8); }
.metric-explain-meta li + li { margin-top: 3px; }
.metric-source-list { list-style: none; padding-inline-start: 0 !important; }
.metric-source-list li { display: grid; gap: 3px; padding: 7px 0; border-top: 1px solid var(--line, #2a3d58); }
.metric-source-list li:first-child { border-top: 0; padding-top: 0; }
.metric-source-list strong { color: var(--txt, #eef5ff); font: 700 10px/1.3 ui-monospace, "SFMono-Regular", Consolas, monospace; }
.metric-source-list span, .metric-source-list small { color: var(--txt2, #b8c4d8); }
.metric-source-list small { line-height: 1.45; }
.metric-source-list a { color: var(--acc, #34e2c4); text-decoration: none; overflow-wrap: anywhere; }
.metric-source-list a:hover, .metric-source-list a:focus-visible { text-decoration: underline; }

html[data-theme="light"] .metric-explain-popover,
body.light .metric-explain-popover {
  box-shadow: 0 18px 46px rgba(38, 56, 84, .18);
}

@media (max-width: 640px) {
  .metric-explain::after { inset-block-start: 7px; inset-inline-end: 7px; }
  .metric-explain-popover { width: calc(100vw - 16px); max-height: min(70vh, 560px); border-radius: 10px; font-size: 12px; }
  .metric-explain-popover.pinned .metric-explain-head button { width: 44px; height: 44px; margin: -14px -7px -14px 8px; }
  .metric-driver-list { grid-template-columns: 1fr; }
  .metric-explain-head,
  .metric-explain-title,
  .metric-explain-section,
  .metric-explain-meta { padding: 10px 12px; }
}

@media (prefers-reduced-motion: reduce) {
  .metric-explain, .metric-explain-popover { scroll-behavior: auto; }
}