/* App Rail - Vertical toolbar for writing tools */

.app-rail {
  position: fixed;
  right: 0;
  top: 60px; /* Account for writing header height */
  bottom: 0;
  width: 48px;
  background: var(--color-bg--surface);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform 0.3s ease;
}

/* Hide on mobile */
@media (max-width: 768px) {
  .app-rail {
    display: none;
  }
}

/* Top Buttons */
.app-rail__top {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-top: env(safe-area-inset-top, 0);
}

/* Toggle Buttons Section */
.app-rail__toggles {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 0.5rem;
}

.app-rail__separator {
  height: 1px;
  background: var(--color-border);
  margin: 0.5rem 0.75rem;
}

/* Spacer to push bottom buttons down */
.app-rail__fill {
  flex: 1;
}

/* Bottom Buttons */
.app-rail__bottom {
  display: flex;
  flex-direction: column;
  gap: 0;
  padding-bottom: env(safe-area-inset-bottom, 0.5rem);
}

/* Button Styles */
.app-rail__button {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  background: none;
  border: none;
  color: var(--color-ink--surface);
  opacity: 0.6;
  cursor: pointer;
  transition: opacity 0.15s ease, background-color 0.15s ease;
}

.app-rail__button:hover {
  opacity: 1;
  background: var(--color-bg--container);
}

.app-rail__button:active {
  background: var(--color-bg--overlay);
}

/* Selected State */
.app-rail__button--selected {
  opacity: 1;
  color: var(--color-primary);
}

.app-rail__button--selected .app-rail__selected-marker {
  opacity: 1;
}

/* Selected Marker */
.app-rail__selected-marker {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 24px;
  background: var(--color-primary);
  border-radius: 0 2px 2px 0;
  opacity: 0;
  transition: opacity 0.15s ease;
}

/* Distraction-free mode - hide sidebars */
.writing-sidebar--hidden {
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.writing-sidebar--left.writing-sidebar--hidden {
  transform: translateX(-100%);
}

.writing-sidebar--right.writing-sidebar--hidden {
  transform: translateX(100%);
}

/* Adjust main content area when sidebars are hidden */
.writing-sidebar--left.writing-sidebar--hidden ~ .writing-main {
  margin-left: 0;
}

.writing-sidebar--right.writing-sidebar--hidden ~ .writing-main {
  margin-right: 48px; /* Only app rail remains */
}