/* Persistent production reader-shell foundation. */
:root {
  --reader-shell-height: 3.65rem;
  --reader-safe-top: env(safe-area-inset-top, 0px);
  --reader-safe-right: env(safe-area-inset-right, 0px);
  --reader-safe-bottom: env(safe-area-inset-bottom, 0px);
  --reader-safe-left: env(safe-area-inset-left, 0px);
}

html {
  scroll-padding-block: 1rem calc(var(--reader-shell-height) + var(--reader-safe-bottom) + 1rem);
}

.reader-shell {
  min-height: 100svh;
  padding-bottom: calc(var(--reader-shell-height) + var(--reader-safe-bottom) + 1.5rem);
}

.reader-actions {
  position: fixed;
  z-index: 80;
  right: max(1rem, var(--reader-safe-right));
  bottom: max(0.65rem, var(--reader-safe-bottom));
  left: max(1rem, var(--reader-safe-left));
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  width: min(calc(100% - 2rem), 37rem);
  min-height: var(--reader-shell-height);
  margin-inline: auto;
  overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--section-line) 88%, transparent);
  border-radius: 0.35rem;
  background: color-mix(in srgb, var(--panel) 96%, transparent);
  box-shadow: 0 0.45rem 1.5rem rgb(40 30 20 / 15%);
}

.reader-actions button {
  display: grid;
  grid-template-columns: 1.2rem minmax(0, 1fr);
  align-content: center;
  align-items: center;
  gap: 0.12rem 0.35rem;
  min-width: 0;
  min-height: 3.5rem;
  padding: 0.35rem 0.55rem;
  border: 0;
  border-right: 1px solid var(--section-pale);
  background: transparent;
  color: var(--ink-soft);
  font: 650 0.73rem/1.15 var(--sans);
  text-align: left;
  cursor: pointer;
}

.reader-actions button:last-child { border-right: 0; }
.reader-actions button:hover { background: var(--section-wash); }
.reader-actions button[aria-expanded="true"] { color: var(--section-ink); background: var(--section-row); }
.reader-actions .action-mark { color: var(--section-ink); font: 600 1rem/1 var(--serif); text-align: center; }
.reader-actions .action-state { grid-column: 2; color: var(--ink-faint); font-size: 0.65rem; font-weight: 500; }

.reader-surface {
  width: min(calc(100% - 2rem), 37rem);
  max-width: calc(100vw - 2rem);
  max-height: min(86svh, 48rem);
  margin: auto;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--section-line);
  border-radius: 0.35rem;
  background: var(--panel);
  color: var(--ink);
  box-shadow: 0 1.5rem 4rem rgb(30 24 18 / 22%);
}

.reader-surface::backdrop { background: rgb(36 30 24 / 38%); }
.reader-surface, .reader-surface * { min-width: 0; overflow-wrap: anywhere; }

.surface-head {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1rem 0.8rem;
  border-bottom: 1px solid var(--section-pale);
}

.surface-head h2 { margin: 0; color: var(--section-ink); font: 500 1.35rem/1.2 var(--serif); }
.surface-kicker { margin: 0 0 0.2rem; color: var(--ink-faint); font: 700 0.66rem/1.2 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; }
.surface-close {
  flex: 0 0 2.75rem;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: 1px solid var(--section-pale);
  border-radius: 50%;
  background: transparent;
  color: var(--section-ink);
  font: 400 1.4rem/1 var(--sans);
  cursor: pointer;
}

.surface-body {
  max-width: 100%;
  max-height: calc(min(86svh, 48rem) - 5rem);
  padding: 1rem;
  overflow: auto;
  overflow-x: hidden;
}

.surface-fields { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.8rem; }
.surface-field { display: grid; gap: 0.25rem; }
.surface-field.is-wide, .surface-apply { grid-column: 1 / -1; }
.surface-field label { color: var(--section-ink); font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.05em; text-transform: uppercase; }
.surface-field input, .surface-field select, .surface-apply, .date-steps button {
  width: 100%;
  max-width: 100%;
  min-height: 2.75rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--section-pale);
  border-radius: 0.2rem;
  background: var(--page);
  color: var(--ink);
  font: 1rem/1.2 var(--sans);
}
.surface-apply { cursor: pointer; background: var(--section-row); color: var(--section-ink); font-weight: 700; }
.date-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.45rem; margin-bottom: 1rem; }
.date-steps button { white-space: normal; cursor: pointer; }
.surface-note { margin: 0.85rem 0 0; color: var(--ink-faint); font: 0.8rem/1.5 var(--sans); }

.semantic-contents { display: grid; gap: 0.1rem; }
.contents-division { margin: 0 0 0.35rem; color: var(--section-ink); font: 700 0.7rem/1.3 var(--sans); letter-spacing: 0.08em; text-transform: uppercase; }
.semantic-contents button {
  display: grid;
  grid-template-columns: 1.8rem minmax(0, 1fr);
  gap: 0.5rem;
  width: 100%;
  min-height: 2.75rem;
  padding: 0.55rem;
  border: 0;
  border-left: 0.2rem solid transparent;
  background: transparent;
  color: var(--ink-soft);
  font: 0.92rem/1.35 var(--serif);
  text-align: left;
  cursor: pointer;
}
.semantic-contents button::before { content: attr(data-ordinal); color: var(--ink-faint); font: 0.65rem/1.5 var(--sans); }
.semantic-contents button[aria-current="location"] { border-left-color: var(--section-ink); background: var(--section-row); color: var(--section-ink); }

.mode-options { display: grid; gap: 0.4rem; }
.mode-options button {
  display: grid;
  grid-template-columns: 5rem minmax(0, 1fr);
  gap: 0.75rem;
  width: 100%;
  min-height: 3.2rem;
  padding: 0.65rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink-soft);
  font: 0.82rem/1.4 var(--sans);
  text-align: left;
}
.mode-options button[aria-checked="true"] { border-color: var(--section-pale); background: var(--section-row); }
.mode-options button:disabled { opacity: 0.72; }
.mode-options strong { color: var(--section-ink); font: 500 1rem/1.3 var(--serif); }

.details-list { display: grid; grid-template-columns: minmax(0, 8rem) minmax(0, 1fr); gap: 0.4rem 0.85rem; margin: 0; }
.details-list dt { color: var(--section-ink); font: 700 0.7rem/1.4 var(--sans); text-transform: uppercase; }
.details-list dd { margin: 0; color: var(--ink-soft); font: 0.9rem/1.5 var(--serif); }
.details-section + .details-section { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--section-pale); }
.details-section h3 { margin: 0 0 0.45rem; color: var(--section-ink); font: 700 0.72rem/1.3 var(--sans); letter-spacing: 0.07em; text-transform: uppercase; }
.details-section ul { margin: 0; padding-left: 1.2rem; color: var(--ink-soft); font: 0.86rem/1.5 var(--serif); }
.source-identifier { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 0.8em; overflow-wrap: anywhere; }

@media (min-width: 72rem) {
  .reader-surface.contents-surface, .reader-surface.details-surface {
    position: fixed;
    top: 4rem;
    bottom: calc(var(--reader-shell-height) + 1.5rem);
    width: min(20rem, calc((100vw - 48rem) / 2 - 1rem));
    max-height: none;
    margin: 0;
  }
  .reader-surface.contents-surface { left: max(1rem, var(--reader-safe-left)); }
  .reader-surface.details-surface { right: max(1rem, var(--reader-safe-right)); }
  .reader-surface.contents-surface .surface-body,
  .reader-surface.details-surface .surface-body { max-height: calc(100vh - 10rem); }
}

@media (max-width: 52rem) {
  .reader-actions {
    right: var(--reader-safe-right);
    bottom: var(--reader-safe-bottom);
    left: var(--reader-safe-left);
    width: auto;
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
    border-radius: 0;
  }
  .reader-actions button { grid-template-columns: minmax(0, 1fr); justify-items: center; gap: 0.05rem; padding: 0.25rem 0.2rem; text-align: center; }
  .reader-actions .action-state { grid-column: 1; }
  .reader-surface { width: 100%; max-width: 100%; max-height: min(88svh, 48rem); margin: auto 0 0; border-inline: 0; border-bottom: 0; border-radius: 0.45rem 0.45rem 0 0; }
  .surface-body { max-height: calc(min(88svh, 48rem) - 5rem); padding-right: max(1rem, var(--reader-safe-right)); padding-left: max(1rem, var(--reader-safe-left)); }
  .surface-head { padding-right: max(1rem, var(--reader-safe-right)); padding-left: max(1rem, var(--reader-safe-left)); }
}

@media (max-width: 25rem) {
  .reader-actions button { font-size: 0.66rem; overflow-wrap: normal; }
  .reader-actions .action-mark { font-size: 0.9rem; }
  .surface-fields, .mode-options button, .details-list { grid-template-columns: minmax(0, 1fr); }
  .surface-field.is-wide, .surface-apply { grid-column: auto; }
  .date-steps { gap: 0.25rem; }
  .date-steps button { padding-inline: 0.25rem; font-size: 0.88rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media (forced-colors: active) {
  .reader-actions, .reader-surface { border: 1px solid CanvasText; }
  .semantic-contents button[aria-current="location"] { border-left-color: Highlight; }
}

@media print {
  .reader-actions, .reader-surface { display: none !important; }
  .reader-shell { min-height: 0; padding-bottom: 0; }
}