/* author: https://github.com/nhermab
   licence: MIT
   Shared button & navigation styles */

button:focus-visible,
.list-button:focus-visible,
.back-button:focus-visible,
.tab-button:focus-visible {
  outline: 2px solid #b0b0b0;
  outline-offset: 2px;
  box-shadow: 0 0 0 2px #b0b0b0;
}

.back-button {
  border-radius: 999px;
  border: 1px solid #232526;
  padding: 0.35rem 0.75rem;
  background: var(--color-bg-card);
  color: var(--color-text);
  cursor: pointer;
  font: inherit;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, transform 80ms ease, box-shadow 120ms ease;
  box-shadow: none;
}

.back-button:hover {
  background: #232526;
  border-color: var(--color-primary-light);
  color: var(--color-primary-light);
  box-shadow: 0 2px 8px rgba(0,0,0,0.7);
  transform: translateY(-1px) scale(1.02);
}

.back-button:active {
  transform: translateY(0);
  box-shadow: none;
}

.list {
  list-style: none;
  padding: 0;
  margin: 0.25rem 0 0;
}

.list-item {
  margin-bottom: 0.35rem;
}

.list-button {
  width: 100%;
  text-align: left;
  padding: 0.5rem 0.6rem;
  border-radius: 0.6rem;
  border: 1px solid #232526;
  background: var(--color-bg-card);
  cursor: pointer;
  font: inherit;
  color: var(--color-text);
  transition: background 140ms ease, border-color 140ms ease, transform 80ms ease, box-shadow 140ms ease, color 140ms ease;
  box-shadow: none;
  animation: none;
}

.list-button:nth-child(1) { animation-delay: 0.05s; }
.list-button:nth-child(2) { animation-delay: 0.1s; }
.list-button:nth-child(3) { animation-delay: 0.15s; }
.list-button:nth-child(4) { animation-delay: 0.2s; }
.list-button:nth-child(5) { animation-delay: 0.25s; }
.list-button:nth-child(6) { animation-delay: 0.3s; }
.list-button:nth-child(7) { animation-delay: 0.35s; }
.list-button:nth-child(8) { animation-delay: 0.4s; }
.list-button:nth-child(9) { animation-delay: 0.45s; }
.list-button:nth-child(10) { animation-delay: 0.5s; }
.list-button:nth-child(n+11) { animation-delay: 0.55s; }

.list-button:hover {
  background: #232526;
  border-color: var(--color-primary-light);
  color: var(--color-primary-light);
  box-shadow: 0 2px 8px rgba(0,0,0,0.7);
  transform: translateY(-2px);
}

.list-button.is-active, .tab-button.is-active, .practice-attachment-button.is-active {
  box-shadow: 0 0 0 2px #b0b0b0;
  border-color: #b0b0b0;
  color: #e6e6e6;
  background: #232526;
}

.tabs {
  border-bottom: 1px solid #232526;
  margin-bottom: 0.75rem;
  display: flex;
  gap: 0.25rem;
  background: var(--color-bg-card);
  backdrop-filter: none;
  flex-shrink: 0;
  box-shadow: none;
}

.tab-button {
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--color-bg-dark);
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  font: inherit;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease, box-shadow 120ms ease, transform 80ms ease;
  position: relative;
}

.tab-button:hover {
  color: #e6e6e6;
  border-color: #b0b0b0;
  background: #232526;
  box-shadow: 0 2px 8px rgba(0,0,0,0.7);
  transform: translateY(-1px);
}

.tab-button.is-active {
  border-color: #b0b0b0;
  font-weight: 600;
  color: #e6e6e6;
  background: #232526;
  box-shadow: 0 2px 8px rgba(0,0,0,0.7);
}

.chapter-list-button {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding-inline: 0.9rem 0.9rem;
}

.chapter-list-main {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  overflow: hidden;
}

.chapter-list-number {
  flex: 0 0 auto;
  min-width: 1.5rem;
  text-align: right;
  opacity: 0.8;
  font-variant-numeric: tabular-nums;
}

.chapter-list-text {
  flex: 1 1 auto;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.chapter-list-title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chapter-list-description {
  margin-top: 0.1rem;
  font-size: 0.8rem;
  opacity: 0.85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
}

.chapter-list-button:hover .chapter-list-description {
  animation: chapter-desc-scroll 12s linear infinite;
}

@keyframes chapter-desc-scroll {
  0% {
    transform: translateX(0);
  }
  40% {
    transform: translateX(0);
  }
  60% {
    transform: translateX(-40%);
  }
  100% {
    transform: translateX(-40%);
  }
}

.chapter-list-read-badge {
  flex: 0 0 auto;
  margin-left: auto;
  padding: 0.1rem 0.4rem;
  border-radius: 999px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: rgba(144, 238, 144, 0.18);
  color: #8fdd8f;
}

.chapter-list-button.is-read {
  border-left: 3px solid rgba(144, 238, 144, 0.8);
  padding-left: 0.7rem;
  opacity: 0.95;
}