/* ── Sidebar ──────────────────────────────────────────────────── */
#sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-header {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.logo {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo::before {
  content: '';
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 6px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

#btn-new {
  width: 100%;
  background: var(--accent);
  color: #0d0f10;
  border: none;
  border-radius: var(--radius);
  padding: 9px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: var(--trans);
  text-transform: uppercase;
}

#btn-new:hover { filter: brightness(1.12); transform: translateY(-1px); }
#btn-new:active { transform: translateY(0); }

/* ── Tabs ─────────────────────────────────────────────────────── */
.sidebar-tabs {
  display: flex;
  padding: 8px 10px 0;
  gap: 4px;
  border-bottom: 1px solid var(--border);
}

.sidebar-tab {
  flex: 1;
  padding: 8px 4px;
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: var(--radius) var(--radius) 0 0;
  transition: var(--trans);
  opacity: 0.6;
}

.sidebar-tab:hover { opacity: 1; color: var(--text); }
.sidebar-tab.active {
  opacity: 1;
  color: var(--accent);
  background: var(--surface2);
}

#sessions-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px 10px;
}

.session-item {
  padding: 10px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--trans);
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  border: 1px solid transparent;
  margin-bottom: 2px;
}

.session-item:hover { background: var(--surface2); }
.session-item.active {
  background: var(--surface2);
  border-color: var(--border);
}

.session-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 2px; height: 60%;
  background: var(--accent);
  border-radius: 0 2px 2px 0;
}

.session-name {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-preview {
  font-size: 11px;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-del {
  position: absolute;
  right: 8px; top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--muted);
  font-size: 16px;
  cursor: pointer;
  padding: 4px;
  opacity: 0;
  transition: var(--trans);
  line-height: 1;
}

.session-item:hover .session-del { opacity: 1; }
.session-del:hover { color: var(--danger); }

.sessions-empty {
  text-align: center;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 30px 10px;
  line-height: 1.8;
}

/* ── Tasks list ───────────────────────────────────────────────── */
#tasks-list {
  flex: 1;
  overflow-y: auto;
  padding: 10px 10px;
  display: none;
}

#tasks-list.active { display: block; }

.task-item {
  padding: 10px 10px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: var(--trans);
  border: 1px solid transparent;
  margin-bottom: 2px;
}

.task-item:hover { background: var(--surface2); }
.task-item.active {
  background: var(--surface2);
  border-color: var(--border);
}

.task-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 2px; height: 60%;
  background: var(--accent2);
  border-radius: 0 2px 2px 0;
}

.task-query {
  font-size: 13px;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.task-meta {
  font-size: 11px;
  color: var(--text-dim);
  display: flex;
  gap: 8px;
}

.task-budget {
  color: var(--accent);
  font-family: var(--font-mono);
}

.task-status {
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.task-status.active { background: #2a4a2a; color: #5f5; }
.task-status.paused { background: #4a4a2a; color: #ff5; }
.task-status.done { background: #2a2a4a; color: #55f; }

.task-actions {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.task-btn {
  padding: 4px 8px;
  border: none;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 9px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: var(--trans);
}

.task-btn-pause {
  background: #3a3a2a;
  color: #ff5;
}

.task-btn-pause:hover {
  background: #4a4a2a;
}

.task-btn-pause.resumed {
  background: #2a4a2a;
  color: #5f5;
}

.task-btn-delete {
  background: #3a2a2a;
  color: #f55;
}

.task-btn-delete:hover {
  background: #4a2a2a;
}

.tasks-empty {
  text-align: center;
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 30px 10px;
  line-height: 1.8;
}

#tasks-list.loading {
  opacity: 0.5;
  pointer-events: none;
  position: relative;
}
#tasks-list.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}