/*
 * Topic View Layout
 */

.topic-header {
  background: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-6);
  margin-bottom: var(--spacing-6);
}

.topic-title-section {
  margin-bottom: var(--spacing-5);

  & h1 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    margin: 0 0 var(--spacing-3) 0;
    line-height: var(--line-height-tight);
  }
}

.topic-controls {
  display: flex;
  gap: var(--spacing-6);
  flex-wrap: wrap;
}

.view-controls {
  display: flex;
  gap: var(--spacing-4);
  align-items: center;
}

.view-mode-toggle,
.sort-toggle {
  display: flex;
  border: var(--border-width) solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  overflow: hidden;
}

.toggle-btn {
  padding: var(--spacing-2) var(--spacing-4);
  background: var(--color-bg-card);
  color: var(--color-gray-600);
  text-decoration: none;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);

  &:not(:last-child) {
    border-right: var(--border-width) solid var(--color-gray-300);
  }

  &:hover {
    background: var(--color-gray-50);
  }

  &.active {
    background: var(--color-primary-500);
    color: white;
  }
}

.topic-navigation {
  margin-top: var(--spacing-8);
  text-align: center;
}

.back-link {
  color: var(--color-gray-500);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);

  &:hover {
    color: var(--color-text-secondary);
  }
}

.participants-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.participant-row {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--spacing-3);
  align-items: center;
  padding: var(--spacing-3);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius-md);
  background: var(--color-bg-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);

  &.is-core-team {
    border-color: #ff0080;
    box-shadow: 0 2px 8px rgba(255, 0, 128, 0.15);
  }

  &.is-committer {
    border-color: #8b5cf6;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.12);
  }

  &.is-major-contributor {
    border-color: #f59e0b;
    box-shadow: 0 2px 8px rgba(245, 158, 11, 0.12);
  }

  &.is-significant-contributor {
    border-color: #10b981;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.12);
  }

  &.is-past-contributor {
    border-color: var(--color-border);
    background: var(--color-gray-50);
  }

  &:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
  }
}

.participant-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
}

.participant-name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.participant-more {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  padding: 0 var(--spacing-1);
}

.thread-outline {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.branch-details {
  border-left: 3px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  background: var(--color-bg-card);
  padding: var(--spacing-1) 0;
}

.branch-details summary {
  list-style: none;
  cursor: pointer;
}

.branch-details summary::-webkit-details-marker {
  display: none;
}

.outline-summary {
  padding: var(--spacing-2) var(--spacing-3);
}

.outline-item {
  display: block;
  padding: var(--spacing-2) var(--spacing-3);
  border-radius: var(--border-radius-sm);
  border-left: 3px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text-primary);
  background: var(--color-bg-card);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
  cursor: default;

  &:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-primary-500);
    transform: translateX(2px);
  }
}

.outline-item.reply {
  padding-left: var(--spacing-4);
  border-left-color: var(--color-primary-200);
}

.outline-item.branch-start {
  cursor: pointer;
}

.outline-item.branch-0 { border-left-color: #2563eb; }
.outline-item.branch-1 { border-left-color: #7c3aed; }
.outline-item.branch-2 { border-left-color: #f59e0b; }
.outline-item.branch-3 { border-left-color: #10b981; }
.outline-item.branch-4 { border-left-color: #ef4444; }
.outline-item.branch-5 { border-left-color: #0ea5e9; }
.branch-details.branch-0 { border-left-color: #2563eb; }
.branch-details.branch-1 { border-left-color: #7c3aed; }
.branch-details.branch-2 { border-left-color: #f59e0b; }
.branch-details.branch-3 { border-left-color: #10b981; }
.branch-details.branch-4 { border-left-color: #ef4444; }
.branch-details.branch-5 { border-left-color: #0ea5e9; }

.outline-content {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-3);
  align-items: baseline;
}

.branch-toggle {
  display: inline-block;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  transform: rotate(0deg);
  transition: transform var(--transition-fast);
  width: 16px;
}

.branch-collapsed .branch-toggle,
.branch-details[open] .branch-toggle {
  transform: rotate(90deg);
}

.outline-meta {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  flex-wrap: wrap;
}

.outline-avatars {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.outline-avatar {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: var(--border-width) solid var(--color-border);
  object-fit: cover;
  background: white;
}

.outline-number {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.outline-icon {
  color: var(--color-primary-600);
  font-weight: var(--font-weight-bold);
}

.outline-author {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.outline-parent {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.outline-time {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}