/* ─────────────────────────────────────────────────────────────
 *  Sessions — Session List, Chat View, Diff Viewer styles
 * ────────────────────────────────────────────────────────────── */

/* ═══ Session Layout ═══ */
.session-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

@media (min-width: 769px) {
  .session-split {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--space-md);
    min-height: 500px;
  }
}

@media (max-width: 768px) {
  .session-split {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
  }
  .session-list {
    max-height: 300px;
  }
}

/* ─── Detail tabs ─── */
.session-detail-tabs {
  display: flex;
  gap: 2px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: 3px;
  margin-bottom: var(--space-md);
}

.session-detail-tab {
  flex: 1;
  padding: 8px 12px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  font-family: inherit;
}

.session-detail-tab:hover {
  color: var(--text-primary);
  background: var(--glass-highlight);
}

.session-detail-tab.active {
  background: var(--gradient-accent);
  color: var(--accent-text);
  box-shadow: var(--shadow-glow-sm);
}

/* Back button (mobile) */
.session-back-btn {
  display: none;
  align-items: center;
  gap: 4px;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 14px;
  cursor: pointer;
  padding: 6px 0;
  margin-bottom: var(--space-sm);
  font-family: inherit;
}

@media (max-width: 768px) {
  .session-back-btn {
    display: inline-flex;
  }
}

/* ═══ Session List ═══ */
.session-list {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.session-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--glass-border);
}

.session-list-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.session-search {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
}

.session-search-input {
  width: 100%;
  font-size: 13px;
  padding: 6px 10px;
  box-sizing: border-box;
}

.session-list-scroll {
  overflow-y: auto;
  flex: 1;
  max-height: 460px;
}

.session-group-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-hint);
  padding: 10px 14px 4px;
}

.session-item {
  padding: 12px 14px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-fast);
}

.session-item:hover {
  background: var(--bg-card-hover);
}

.session-item.active {
  background: var(--accent-subtle);
  border-left: 3px solid var(--accent);
  padding-left: 11px;
}

.session-item-row {
  display: flex;
  align-items: center;
  gap: 6px;
}

.session-item-icon {
  font-size: 14px;
  flex-shrink: 0;
}

.session-item-title {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-item-status {
  font-size: 12px;
  flex-shrink: 0;
}

.session-item-preview {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 3px;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-item-time {
  font-size: 11px;
  color: var(--text-hint);
  margin-top: 2px;
  line-height: 1.3;
}

.session-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  gap: var(--space-sm);
}

.session-empty-icon {
  font-size: 32px;
  opacity: 0.6;
}

.session-empty-text {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
}

.session-empty-subtext {
  font-size: 11px;
  color: var(--text-hint);
  margin-top: 4px;
}

.session-empty-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 4px;
}

/* ═══ Chat View ═══ */
.chat-view {
  display: flex;
  flex-direction: column;
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  min-height: 400px;
  max-height: 600px;
  overflow: hidden;
}

@media (min-width: 1024px) {
  .chat-view {
    max-height: none;
    min-height: 560px;
  }
}

.chat-view.chat-empty-state {
  align-items: center;
  justify-content: center;
}

.chat-header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--glass-border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.chat-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(8, 14, 24, 0.3);
}

.chat-toolbar-left {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.chat-toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.chat-filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chat-filter-chip {
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chat-filter-chip:hover {
  color: var(--text-primary);
  border-color: rgba(148, 163, 184, 0.4);
}

.chat-filter-chip.active {
  color: var(--text-primary);
  border-color: var(--accent);
  background: rgba(59, 130, 246, 0.12);
}

.chat-filter-count {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 999px;
  background: rgba(148, 163, 184, 0.15);
  color: var(--text-hint);
}

.chat-paused-pill {
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: var(--color-error);
  background: rgba(248, 113, 113, 0.12);
}

.chat-header-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-header-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.chat-header-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.chat-header-meta {
  font-size: 12px;
  color: var(--text-hint);
  margin-top: 2px;
  line-height: 1.4;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.chat-empty-state-inline {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  gap: var(--space-sm);
  border: 1px dashed var(--glass-border);
  border-radius: var(--radius-md);
  background: rgba(8, 12, 20, 0.35);
  text-align: center;
}

.chat-loading {
  text-align: center;
  color: var(--text-hint);
  padding: var(--space-lg);
  font-size: 13px;
}

/* ─── Bubbles ─── */
.chat-bubble {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  line-height: 1.5;
  word-wrap: break-word;
}

.chat-bubble.user {
  align-self: flex-end;
  background: var(--gradient-accent);
  color: var(--accent-text);
  border-bottom-right-radius: var(--radius-sm);
  box-shadow: var(--shadow-glow-sm);
}

.chat-bubble.assistant {
  align-self: flex-start;
  background: var(--glass-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-bubble.system {
  align-self: center;
  max-width: 90%;
  background: transparent;
  padding: 6px 12px;
}

.chat-bubble.tool {
  align-self: flex-start;
  background: rgba(56, 189, 248, 0.08);
  border: 1px dashed rgba(56, 189, 248, 0.3);
  color: var(--text-primary);
  font-family: var(--font-mono);
}

.chat-bubble.error {
  align-self: flex-start;
  background: rgba(248, 113, 113, 0.12);
  border: 1px solid rgba(248, 113, 113, 0.4);
  color: var(--text-primary);
}

.chat-system-text {
  font-size: 12px;
  color: var(--text-hint);
  text-align: center;
  font-style: italic;
}

.chat-bubble-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--text-hint);
  margin-bottom: 4px;
}

.chat-bubble-content {
  white-space: pre-wrap;
}

.chat-bubble-time {
  font-size: 10px;
  opacity: 0.6;
  margin-top: 4px;
}

/* ─── Code blocks ─── */
.chat-code-block {
  position: relative;
  background: #1e1e2e;
  border-radius: var(--radius-sm);
  margin: 6px 0;
  overflow: hidden;
}

.chat-code-block pre {
  margin: 0;
  padding: 10px 12px;
  overflow-x: auto;
  font-size: 12px;
  line-height: 1.5;
}

.chat-code-block code {
  font-family: var(--font-mono);
  color: #e2e8f0;
}

.chat-code-copy {
  position: absolute;
  top: 6px;
  right: 6px;
  background: rgba(255, 255, 255, 0.1);
  border: none;
  color: #aaa;
  font-size: 12px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}

.chat-code-copy:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ─── Markdown rendering ─── */
.md-rendered {
  white-space: normal;
  word-wrap: break-word;
}

.md-heading {
  font-weight: 600;
  margin: 4px 0;
}

.md-h1 { font-size: 1.3em; }
.md-h2 { font-size: 1.15em; }
.md-h3 { font-size: 1.05em; }

.md-blockquote {
  border-left: 3px solid var(--accent);
  background: var(--glass-bg);
  padding: 6px 12px;
  margin: 4px 0;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
}

.md-list {
  margin: 4px 0;
  padding-left: 20px;
}

.md-list li {
  margin: 2px 0;
}

ul.md-list {
  list-style: none;
  padding-left: 16px;
}

ul.md-list li::before {
  content: "•";
  color: var(--accent);
  font-weight: bold;
  display: inline-block;
  width: 12px;
  margin-left: -12px;
}

.md-link {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.md-link:hover {
  opacity: 0.8;
}

.md-inline-code {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: 1px 6px;
  border-radius: 10px;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.9em;
}

.md-hr {
  border: none;
  border-top: 1px solid var(--glass-border);
  margin: 8px 0;
}

/* ─── Typing indicator ─── */
.chat-typing {
  display: flex;
  gap: 4px;
  padding: 4px 0;
}

.chat-typing-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-hint);
  animation: chat-typing-bounce 1.4s infinite ease-in-out;
}

.chat-typing-dot:nth-child(2) {
  animation-delay: 0.16s;
}

.chat-typing-dot:nth-child(3) {
  animation-delay: 0.32s;
}

@keyframes chat-typing-bounce {
  0%, 80%, 100% { transform: scale(0.6); opacity: 0.4; }
  40% { transform: scale(1); opacity: 1; }
}

/* ─── Input bar ─── */
.chat-input-bar {
  border-top: 1px solid var(--border);
  padding: 10px 12px;
  flex-shrink: 0;
}

.chat-resume-btn {
  width: 100%;
  margin-bottom: var(--space-sm);
}

.chat-input-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  resize: none;
  font-size: 13px;
  min-height: 36px;
  max-height: 100px;
  line-height: 1.4;
  padding: 8px 12px;
  box-sizing: border-box;
}

.chat-send-btn {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  border-radius: var(--radius-md);
}

/* ═══ Diff Viewer ═══ */
.diff-viewer {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 200px;
}

.diff-viewer.diff-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.diff-loading {
  text-align: center;
  color: var(--text-hint);
  padding: var(--space-lg);
  font-size: 13px;
}

.diff-summary {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  border-bottom: 1px solid var(--glass-border);
  background: var(--glass-bg);
}

.diff-stat-add {
  color: var(--color-done);
  font-weight: 600;
  font-size: 12px;
}

.diff-stat-del {
  color: var(--color-error);
  font-weight: 600;
  font-size: 12px;
}

.diff-file-list {
  display: flex;
  flex-direction: column;
}

.diff-file-item {
  border-bottom: 1px solid var(--border);
}

.diff-file-item:last-child {
  border-bottom: none;
}

.diff-file-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  cursor: pointer;
  transition: background var(--transition-fast);
  font-size: 13px;
}

.diff-file-header:hover {
  background: var(--bg-card-hover);
}

.diff-file-header.added {
  border-left: 3px solid var(--color-done);
  padding-left: 11px;
}

.diff-file-header.deleted {
  border-left: 3px solid var(--color-error);
  padding-left: 11px;
}

.diff-file-header.modified {
  border-left: 3px solid var(--color-inreview);
  padding-left: 11px;
}

.diff-file-icon {
  font-size: 14px;
  flex-shrink: 0;
}

.diff-file-name {
  flex: 1;
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.diff-file-stats {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.diff-file-toggle {
  color: var(--text-hint);
  font-size: 12px;
  flex-shrink: 0;
}

/* ─── Diff hunks ─── */
.diff-hunk {
  background: rgba(6, 8, 16, 0.9);
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 12px;
  line-height: 1.6;
  overflow-x: auto;
}

.diff-line {
  padding: 1px 14px;
  white-space: pre;
}

.diff-line.addition {
  background: rgba(16, 185, 129, 0.1);
  color: #6ee7b7;
}

.diff-line.deletion {
  background: rgba(248, 113, 113, 0.1);
  color: #fca5a5;
}

.diff-line.context {
  color: #94a3b8;
}

.diff-line.hunk-header {
  color: #7c3aed;
  background: rgba(124, 58, 237, 0.08);
  font-weight: 500;
}

.diff-line-text {
  display: inline;
}

@media (min-width: 1200px) {
  .app-shell[data-has-rail="true"] .session-split {
    grid-template-columns: 1fr;
  }

  .app-shell[data-has-rail="true"] .session-split > .session-list {
    display: none;
  }

  .app-shell[data-has-rail="true"] .session-detail {
    min-height: 520px;
  }
}