/* ==========================================================================
   Sheet dialog — the shared <dialog class="sheet"> chrome: head, body
   and the narrow-screen bottom-sheet restyle. Concrete sheets (metrics
   details, auto segments, HR zones, dual-variable, story) layer on top.
   ========================================================================== */

.sheet {
  border: 1px solid var(--border);
  border-radius: var(--radius-l);
  background: var(--surface-elevated);
  color: var(--foreground);
  padding: 0;
  width: min(560px, calc(100vw - 32px));
  max-height: min(76vh, 720px);
  box-shadow: var(--shadow-2);
}

.sheet::backdrop { background: var(--backdrop); }

.sheet-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 16px 10px;
  border-block-end: 1px solid var(--border);
  position: sticky;
  inset-block-start: 0;
  background: var(--surface-elevated);
}

.sheet-head h2 { font-size: 15px; }
.sheet-head .btn { margin-inline-start: auto; }

.sheet-body {
  padding: 6px 16px 18px;
  overflow-y: auto;
  max-height: calc(min(76vh, 720px) - 60px);
}

@media (max-width: 720px) {
  .sheet {
    inset-inline: 0;
    inset-block: auto 0;
    margin: 0;
    width: 100%;
    max-width: none;
    border-radius: var(--radius-l) var(--radius-l) 0 0;
    padding-block-end: env(safe-area-inset-bottom, 0px);
  }
}