/* Version 9.1 — lighter identity, quieter controls, clearer card navigation. */
.site-header {
  isolation: isolate;
}

.site-header::before {
  position: absolute;
  z-index: -1;
  inset: 0 0 auto;
  height: 118px;
  background: linear-gradient(180deg, rgba(8, 7, 5, .28), rgba(8, 7, 5, .08) 58%, transparent);
  content: "";
  pointer-events: none;
}

.site-header .site-logo,
.site-header.is-on-light .site-logo,
.site-header.is-scrolled .site-logo {
  width: 188px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.site-header .site-logo img,
.site-header.is-on-light .site-logo img {
  filter: drop-shadow(0 2px 9px rgba(0, 0, 0, .72));
}

.site-header__actions,
.site-header.is-on-light .site-header__actions,
.site-header.is-scrolled .site-header__actions {
  gap: 22px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.site-header__actions .header-menu-link,
.site-header__actions .header-app {
  text-shadow: 0 2px 10px rgba(0, 0, 0, .9);
}

.site-header .header-book,
.site-header.is-on-light .header-book {
  min-height: 38px;
  padding: 10px 18px;
  border: 1px solid rgba(212, 183, 122, .78);
  border-radius: 0;
  color: var(--black);
  background: rgba(212, 183, 122, .94);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
}

.site-menu > summary {
  background: rgba(13, 12, 10, .48);
}

/* Quiet chapter rail: direct access without interrupting the card composition. */
.deck-rail {
  position: absolute;
  z-index: 80;
  top: 50%;
  right: 20px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  transform: translateY(-50%);
}

.deck-rail button {
  position: relative;
  display: flex;
  min-width: 46px;
  height: 28px;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 0;
  border: 0;
  color: rgba(255, 255, 255, .55);
  background: transparent;
  cursor: pointer;
}

.deck-rail button i {
  display: block;
  width: 12px;
  height: 1px;
  background: currentColor;
  transform-origin: right;
  transition: width .3s var(--ease), background .3s;
}

.deck-rail button > span {
  width: 18px;
  font-size: .46rem;
  font-weight: 700;
  letter-spacing: .08em;
  text-align: right;
}

.deck-rail button em {
  position: absolute;
  top: 50%;
  right: 48px;
  width: max-content;
  max-width: 220px;
  padding: 7px 10px;
  color: var(--white);
  background: rgba(13, 12, 10, .76);
  font-size: .48rem;
  font-style: normal;
  font-weight: 700;
  letter-spacing: .12em;
  line-height: 1.4;
  opacity: 0;
  pointer-events: none;
  text-transform: uppercase;
  transform: translate(8px, -50%);
  transition: opacity .22s, transform .22s;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.deck-rail button:hover,
.deck-rail button:focus-visible,
.deck-rail button.is-active {
  color: var(--gold);
}

.deck-rail button:hover i,
.deck-rail button:focus-visible i,
.deck-rail button.is-active i {
  width: 26px;
}

.deck-rail button:hover em,
.deck-rail button:focus-visible em {
  opacity: 1;
  transform: translate(0, -50%);
}

.deck-rail button:focus-visible {
  outline: 1px solid var(--gold);
  outline-offset: 4px;
}

.panel-deck[data-active-theme="light"] .deck-rail button {
  color: rgba(13, 12, 10, .48);
}

.panel-deck[data-active-theme="light"] .deck-rail button:hover,
.panel-deck[data-active-theme="light"] .deck-rail button:focus-visible,
.panel-deck[data-active-theme="light"] .deck-rail button.is-active {
  color: var(--gold-deep);
}

/* Page count is information, not another glass pill. */
.panel-index,
[data-panel-theme="light"] .panel-index {
  min-width: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
  text-shadow: 0 1px 7px rgba(0, 0, 0, .42);
}

[data-panel-theme="light"] .panel-index {
  text-shadow: none;
}

@media (max-width: 1360px) {
  .site-header__actions {
    gap: 17px;
  }
}

@media (max-width: 980px) {
  .deck-rail {
    display: none;
  }
}

@media (max-width: 860px) {
  .site-header::before {
    height: 92px;
    background: linear-gradient(180deg, rgba(8, 7, 5, .34), rgba(8, 7, 5, .06) 70%, transparent);
  }

  .site-header .site-logo,
  .site-header.is-on-light .site-logo,
  .site-header.is-scrolled .site-logo {
    width: clamp(136px, 39vw, 158px);
  }

  .mobile-actions {
    right: 10px;
    bottom: 8px;
    left: 10px;
    grid-template-columns: .72fr .88fr 1.2fr;
    min-height: 52px;
    padding: 4px;
    border: 1px solid rgba(255, 255, 255, .14);
    border-radius: 999px;
    color: var(--white);
    background: rgba(13, 12, 10, .82);
    box-shadow: 0 12px 32px rgba(0, 0, 0, .28);
    -webkit-backdrop-filter: blur(16px) saturate(1.1);
    backdrop-filter: blur(16px) saturate(1.1);
  }

  .mobile-actions a {
    min-width: 0;
    padding-inline: 4px;
    border: 0;
    border-radius: 999px;
    color: var(--white);
    font-size: clamp(.44rem, 1.85vw, .52rem);
    letter-spacing: .09em;
  }

  .mobile-actions a:last-child {
    color: var(--black);
    background: var(--gold);
  }

  .panel-index,
  [data-panel-theme="light"] .panel-index {
    right: 12px;
    bottom: 10px;
    padding: 5px 8px;
    border: 1px solid rgba(255, 255, 255, .16);
    border-radius: 999px;
    background: rgba(13, 12, 10, .38);
    color: rgba(255, 255, 255, .72);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }
}

@media (max-width: 390px) {
  .site-header .site-logo,
  .site-header.is-on-light .site-logo,
  .site-header.is-scrolled .site-logo {
    width: clamp(120px, 36vw, 140px);
  }

  .mobile-actions {
    right: 7px;
    left: 7px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .deck-rail {
    display: none;
  }

  .deck-rail button,
  .deck-rail button i,
  .deck-rail button em {
    transition: none;
  }
}