.slider {
  width: 100%;
  max-width: 760px;
  height: 100%;
  max-height: calc(100vh - var(--header-height) - var(--footer-height) - 40px);
  max-height: calc(100dvh - var(--header-height) - var(--footer-height) - 40px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  position: relative;
  transition:
    opacity var(--transition-smooth),
    transform var(--transition-smooth),
    visibility var(--transition-smooth);
}

.slider.is-active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  position: relative;
}

.slider.is-hidden {
  opacity: 0;
  visibility: hidden;
  transform: translateY(24px) scale(0.97);
  pointer-events: none;
  position: absolute;
}

/* Meta Bar (Back button, Counter, Indicators) */
.slider__top-bar {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xs);
  flex-shrink: 0;
  gap: var(--space-md);
}

.slider__back-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  background-color: var(--color-bg-glass);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  cursor: pointer;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background-color var(--transition-fast),
    transform var(--transition-fast);
}

.slider__back-btn:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-accent);
  background-color: var(--color-bg-glass-active);
  transform: translateX(-2px);
}

.slider__back-icon {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  stroke-width: 2.2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--transition-fast);
}

.slider__back-btn:hover .slider__back-icon {
  transform: translateX(-2px);
}

.slider__meta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-lg);
}

.slider__counter {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-2xs);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
}

.slider__counter-current {
  color: var(--color-text-accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.slider__counter-divider {
  color: var(--color-text-muted);
}

.slider__counter-total {
  color: var(--color-text-secondary);
  font-weight: 400;
}

/* Indicators (segmented / dots with expanded active state) */
.slider__indicators {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.slider__indicator-dot {
  width: 24px;
  height: 3px;
  border-radius: var(--radius-full);
  background-color: var(--color-border-medium);
  border: none;
  cursor: pointer;
  padding: 0;
  transition:
    background-color var(--transition-normal),
    width var(--transition-normal),
    box-shadow var(--transition-normal);
}

.slider__indicator-dot:hover {
  background-color: var(--color-text-secondary);
}

.slider__indicator-dot--active {
  width: 44px;
  background-color: var(--color-crimson);
  box-shadow: 0 0 10px var(--color-crimson-glow);
}

/* Slide Viewport / Track */
.slider__stage {
  width: 100%;
  flex: 1;
  min-height: 0;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Slide Item Card */
.poem-card {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-glass);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  opacity: 0;
  visibility: hidden;
  transform: translateX(30px) scale(0.98);
  pointer-events: none;
  transition:
    opacity var(--transition-smooth),
    transform var(--transition-smooth),
    visibility var(--transition-smooth);
}

.poem-card--active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0) scale(1);
  pointer-events: auto;
  z-index: 2;
  border-color: rgba(255, 255, 255, 0.09);
  box-shadow: var(--shadow-card), 0 0 40px rgba(166, 38, 53, 0.08);
}

.poem-card--prev {
  transform: translateX(-30px) scale(0.98);
}

/* Card Header: Title & Date */
.poem-card__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border-subtle);
  flex-shrink: 0;
  position: relative;
}

.poem-card__header::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 48px;
  height: 1px;
  background-color: var(--color-crimson);
  box-shadow: 0 0 8px var(--color-crimson);
}

.poem-card__title {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.8);
}

.poem-card__date {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  font-size: 0.8rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
}

.poem-card__date-bullet {
  color: var(--color-crimson);
  font-size: 0.65rem;
}

/* Card Body / Poem Text */
.poem-card__body {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding-right: var(--space-xs);
  user-select: text;
}

.poem-card__text {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.85;
  color: #d1d1d8;
  white-space: pre-line;
  letter-spacing: 0.01em;
}

/* Navigation Controls Bar */
.slider__controls {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-xs);
  flex-shrink: 0;
}

.slider__nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    transform var(--transition-fast);
}

.slider__nav-btn:hover:not(:disabled) {
  color: var(--color-text-primary);
  background-color: var(--color-bg-surface-elevated);
  border-color: var(--color-border-accent);
  box-shadow: 0 0 15px var(--color-crimson-glow);
  transform: translateY(-1px);
}

.slider__nav-btn:active:not(:disabled) {
  transform: translateY(0);
}

.slider__nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
  pointer-events: none;
}

.slider__nav-icon {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--transition-fast);
}

.slider__nav-btn--prev:hover .slider__nav-icon {
  transform: translateX(-2px);
}

.slider__nav-btn--next:hover .slider__nav-icon {
  transform: translateX(2px);
}

.slider__hint {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
}

/* Empty State Placeholder */
.slider__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-2xl);
  color: var(--color-text-secondary);
  border: 1px dashed var(--color-border-subtle);
  border-radius: var(--radius-lg);
  background: var(--color-bg-glass);
}

.slider__empty-icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
  filter: grayscale(1);
  opacity: 0.6;
}

.slider__empty-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin-bottom: var(--space-xs);
  color: var(--color-text-primary);
}

.slider__empty-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .poem-card {
    padding: var(--space-lg);
  }

  .poem-card__title {
    font-size: 1.5rem;
  }

  .poem-card__text {
    font-size: 1rem;
    line-height: 1.7;
  }

  .slider__hint {
    display: none;
  }

  .slider__meta {
    gap: var(--space-md);
  }
}

@media (max-width: 480px) {
  .slider {
    gap: var(--space-xs);
  }

  .poem-card {
    padding: var(--space-md);
  }

  .poem-card__title {
    font-size: 1.3rem;
  }

  .poem-card__text {
    font-size: 0.95rem;
    line-height: 1.65;
  }

  .slider__nav-btn span {
    display: none;
  }

  .slider__nav-btn {
    padding: var(--space-xs);
    border-radius: 50%;
  }

  .slider__indicator-dot {
    width: 16px;
  }

  .slider__indicator-dot--active {
    width: 28px;
  }

  .slider__back-btn span {
    display: none;
  }

  .slider__back-btn {
    padding: var(--space-xs);
    border-radius: 50%;
  }
}