.r-shell { position: fixed; inset: 0; background: var(--bg-1); color: var(--fg-1); font-family: var(--font-sans); overflow: hidden; }

.r-scroll {
  position: absolute; inset: 0;
  overflow-y: auto;
  padding-top: 56px;
  padding-bottom: 48px;
}

.r-scroll--empty { padding-bottom: 0; }

.book-head { max-width: var(--reader-measure); margin: 56px auto 48px; padding: 0 24px; }
.book-head__eyebrow { font-family: var(--font-sans); font-size: 0.58em; font-weight: 600; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.10em; margin-bottom: 1em; }
.book-head__title { font-family: var(--font-serif); font-size: 2.8em; font-weight: 600; letter-spacing: -0.02em; line-height: 1.05; color: var(--fg-1); margin: 0 0 0.8em; text-wrap: balance; }
.book-head__author { font-family: var(--font-serif); font-size: 0.9em; color: var(--fg-2); font-style: italic; }

.chap-heading { max-width: var(--reader-measure); margin: 4.5em auto 1.8em; padding: 0 24px; }
.chap-heading__num { font-family: var(--font-sans); font-size: 0.58em; font-weight: 600; color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.10em; margin-bottom: 0.6em; }
.chap-heading__title { font-family: var(--font-serif); font-size: 1.5em; font-weight: 600; letter-spacing: -0.015em; color: var(--fg-1); margin: 0; }

.chapter-entry {
  position: relative;
  max-width: var(--reader-measure);
  margin: 0 auto;
}

.chapter-entry__body {
  position: relative;
}

.chapter-entry__body[hidden] {
  display: none;
}

.entry-editable {
  position: relative;
}

.chapter-entry__edit {
  position: absolute;
  top: 0;
  left: 0;
  margin-top: -9px;
  margin-left: -40px;
  z-index: 1;
}

.chapter-entry .chap-heading {
  padding-left: 0;
  padding-right: 0;
}

.chap-heading__date-row {
  margin-bottom: 0.6em;
}

.chap-heading__date-row .chap-heading__num {
  margin-bottom: 0;
}

.chapter-entry__content .chapter-entry__edit {
  top: 0;
}

.chapter-entry__content-body {
  max-width: var(--reader-measure);
}

.reader { padding: 0 24px; }
.reader h2 { font-size: 1.5em; line-height: 1.15; letter-spacing: -0.015em; margin: 2em 0 0.6em; }
.reader h3 { font-size: 1.2em; line-height: 1.25; letter-spacing: -0.01em;  margin: 1.8em 0 0.5em; }
.reader h4 { font-family: var(--font-serif); font-size: 1em; font-weight: 600; margin: 1.5em 0 0.4em; }

.entry-compose {
  max-width: 100%;
  margin: 4.5em auto 6em;
  padding: 0 24px;
}

.entry-compose__add {
  margin-top: 1em;
}

.entry-form {
  display: grid;
  gap: 16px;
  width: 100%;
  max-width: 100%;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-2);
}

.entry-form[hidden],
.entry-compose__add[hidden] {
  display: none;
}

.entry-form__row[hidden],
.entry-form__field[hidden],
.entry-editable[hidden] {
  display: none;
}

.entry-form__row {
  display: grid;
  grid-template-columns: minmax(150px, 0.35fr) minmax(0, 1fr);
  gap: 12px;
}

.entry-form__field {
  display: grid;
  gap: 6px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--fg-2);
}

.entry-form__markdown {
  min-height: 260px;
  width: 100%;
  height: auto;
  padding: 12px;
  resize: vertical;
  line-height: 1.5;
  font-family: var(--font-mono);
}

.entry-form__actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.entry-form__error {
  color: var(--danger);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
}

.chapter-entry .entry-form {
  margin-top: 1em;
  margin-bottom: 1.8em;
}

.entry-form[data-mode="date"] .entry-form__row,
.entry-form[data-mode="title"] .entry-form__row {
  grid-template-columns: 1fr;
}

.r-top-zone {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 28px;
  z-index: 11;
}

.r-top, .r-bot {
  position: fixed; left: 0; right: 0;
  display: flex; align-items: center; gap: 12px; padding: 0 16px;
  background: color-mix(in oklch, var(--bg-1) 85%, transparent);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  transition: opacity var(--dur-base) var(--ease), transform var(--dur-base) var(--ease); z-index: 10;
}
.r-top { top: 0; height: 56px; border-bottom: 1px solid var(--line); }
.r-bot { bottom: 0; height: 48px; border-top: 1px solid var(--line); }
.r-hidden { opacity: 0; pointer-events: none; transform: translateY(-10px); }

.r-top__spacer { flex: 1; min-width: 0; }
.r-top__meta { flex: 1; min-width: 0; text-align: center; }
.r-top__title { font-family: var(--font-serif); font-size: 14px; font-weight: 600; color: var(--fg-1); letter-spacing: -0.005em; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.r-top__author { font-size: 11px; color: var(--fg-3); }
.r-top__actions {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.r-top__link {
  color: var(--fg-2);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color var(--dur-fast) var(--ease);
}
button.r-top__link { border: 0; background: transparent; cursor: pointer; padding: 0; }
.r-top__link:hover { color: var(--fg-1); }
.r-top__link[aria-pressed="true"] { color: var(--accent); }
.r-top__link .icon { width: 16px; height: 16px; }

.r-shell:not(.is-edit-mode) .chapter-entry__edit,
.r-shell:not(.is-edit-mode) .entry-compose__add {
  display: none;
}

@media (max-width: 520px) {
  .r-top { gap: 8px; padding: 0 12px; }
  .r-top__actions { gap: 18px; }
  .r-top__link .icon { width: 22px; height: 22px; }
  .r-top__link span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
  .chapter-entry__edit,
  .chapter-entry__content .chapter-entry__edit { left: 0; top: 0; margin-left: 0; }
  .chap-heading { padding-left: 44px; }
  .chapter-entry .chap-heading { padding-left: 44px; }
  .entry-editable { padding-left: 44px; }
  .chap-heading .entry-editable { padding-left: 0; }
  .entry-form__row { grid-template-columns: 1fr; }
  .entry-form__actions { justify-content: stretch; }
  .entry-form__actions .btn { flex: 1; justify-content: center; }
}

.btn--icon { width: 36px; height: 36px; border: 0; background: transparent; color: var(--fg-2); border-radius: 6px; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; transition: background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease); }
.btn--icon:hover { background: var(--bg-hover); color: var(--fg-1); }
.btn--icon svg { stroke-width: 1.5; width: 20px; height: 20px; }

.r-bot__chap { font-size: 12px; color: var(--fg-2); flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.r-bot__bar { flex: 2; max-width: 220px; height: 2px; background: var(--line); border-radius: 2px; overflow: hidden; }
.r-bot__bar > span { display: block; height: 100%; background: var(--accent); transition: width var(--dur-base) var(--ease); }
.r-bot__pct { font-size: 11px; color: var(--fg-3); font-variant-numeric: tabular-nums; min-width: 42px; text-align: right; }

.r-top::after { content: ''; position: absolute; left: 0; right: 0; top: 100%; height: 24px; background: linear-gradient(to bottom, color-mix(in oklch, var(--bg-1) 60%, transparent), transparent); pointer-events: none; }
.r-bot::before { content: ''; position: absolute; left: 0; right: 0; bottom: 100%; height: 24px; background: linear-gradient(to top, color-mix(in oklch, var(--bg-1) 60%, transparent), transparent); pointer-events: none; }