/* ── CxAI Studio — 3-Column Layout (Enhanced) ── */

/* ── Left nav rail ── */
.nav-rail {
  width: var(--nav-w);
  background: var(--surface);
  border-right: 1px solid var(--border-dim);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  position: relative;
}

.nav-rail::after {
  content: '';
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg,
      rgba(var(--accent-rgb), .3) 0%,
      rgba(var(--accent-rgb), .05) 50%,
      rgba(var(--accent2-rgb), .15) 100%);
}

.nav-logo {
  padding: 18px 16px 16px;
  display: flex;
  align-items: center;
  gap: 11px;
  border-bottom: 1px solid var(--border-dim);
}

.nav-logo-icon {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, #3a5cff, var(--accent), var(--purple));
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 800;
  color: #fff;
  flex-shrink: 0;
  letter-spacing: -.5px;
  box-shadow: 0 2px 12px rgba(var(--accent-rgb), .3);
  position: relative;
}

.nav-logo-icon::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(var(--accent-rgb), .15), transparent);
  z-index: -1;
}

.nav-logo-name {
  font-size: .84rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
}

.nav-logo-sub {
  font-size: .66rem;
  color: var(--muted);
  letter-spacing: .02em;
}

.nav-items {
  flex: 1;
  padding: 10px 8px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  font-size: .82rem;
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--trans);
  user-select: none;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  position: relative;
}

.nav-icon {
  flex-shrink: 0;
  opacity: .6;
  transition: opacity var(--trans);
}

.nav-item:hover .nav-icon {
  opacity: .85;
}

.nav-item.active .nav-icon {
  opacity: 1;
}

.nav-label {
  font-size: .82rem;
}

.nav-item:hover {
  background: rgba(255, 255, 255, .04);
  color: var(--text);
}

.nav-item.active {
  background: var(--accent-mid);
  color: var(--accent);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px rgba(var(--accent-rgb), .15);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 18px;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
  box-shadow: 0 0 8px rgba(var(--accent-rgb), .4);
}

.nav-divider {
  height: 1px;
  background: var(--border-dim);
  margin: 6px 12px;
}

.nav-footer {
  padding: 12px 14px;
  border-top: 1px solid var(--border-dim);
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--bg-raised);
}

.gw-status-row {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: .74rem;
  color: var(--text-dim);
}

.gw-dot-el {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  flex-shrink: 0;
  transition: background var(--trans);
  box-shadow: 0 0 0 2px rgba(0, 0, 0, .2);
}

.gw-dot-el.online {
  background: var(--accent2);
  box-shadow: 0 0 8px rgba(var(--accent2-rgb), .4);
  animation: dotPulse 2s ease-in-out infinite;
}

.nav-version {
  font-size: .68rem;
  color: var(--muted);
}

/* ── Workspace ── */
.workspace {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── Center ── */
.center {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ── Top bar ── */
.topbar {
  height: 52px;
  background: var(--surface);
  border-bottom: 1px solid var(--border-dim);
  padding: 0 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.topbar-title {
  font-size: .9rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -.01em;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.topbar-sep {
  color: var(--muted);
  font-size: .82rem;
}

.topbar-breadcrumb {
  color: var(--muted);
  font-size: .82rem;
}

.topbar-session {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.session-selector {
  font-size: .76rem;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 6px 10px;
  font-family: var(--mono);
  min-width: 140px;
  max-width: 210px;
  cursor: pointer;
  transition: all var(--trans);
}

.session-selector:hover {
  border-color: rgba(var(--accent-rgb), .35);
}

.session-selector:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .1);
  outline: none;
}

.session-selector option {
  background: var(--surface);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 8px;
}

/* ── User menu ── */
.topbar-user {
  position: relative;
  margin-left: 8px;
}

.topbar-user-btn {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px 4px 4px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  color: var(--text-dim);
  cursor: pointer;
  transition: all var(--trans);
  font-family: inherit;
  font-size: .76rem;
}

.topbar-user-btn:hover {
  border-color: rgba(var(--accent-rgb), .3);
  background: var(--surface3);
}

.topbar-avatar {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.topbar-username {
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topbar-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  min-width: 180px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 500;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: all .15s cubic-bezier(.4, 0, .2, 1);
  overflow: hidden;
}

.topbar-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.topbar-dropdown-header {
  padding: 10px 14px;
  font-size: .72rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

.dropdown-role {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: .63rem;
  font-weight: 700;
  text-transform: uppercase;
  background: rgba(var(--accent-rgb), .1);
  color: var(--accent);
  letter-spacing: .04em;
}

.topbar-dropdown-divider {
  height: 1px;
  background: var(--border-dim);
}

.topbar-dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: .8rem;
  color: var(--text-dim);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--trans);
}

.topbar-dropdown-item:hover {
  background: rgba(var(--danger-rgb), .08);
  color: var(--danger);
}

/* ── Panels ── */
.panels {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.panel {
  display: none;
  height: 100%;
  flex-direction: column;
  overflow: hidden;
}

.panel.active {
  display: flex;
  animation: fadeIn .2s ease-out;
}

.panel-inner {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
}

/* ── Footer ── */
.footer-bar {
  border-top: 1px solid var(--border-dim);
  padding: 6px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: .69rem;
  color: var(--muted);
  background: var(--surface);
  flex-shrink: 0;
}

.footer-bar a {
  color: var(--accent);
  text-decoration: none;
}

.footer-bar a:hover {
  opacity: .8;
}

.footer-bar button {
  background: none;
  border: none;
  color: var(--accent);
  cursor: pointer;
  font-size: .69rem;
}

.footer-bar button:hover {
  opacity: .8;
}

/* ── Settings ── */
.settings-panel {
  width: var(--settings-w);
  background: var(--surface);
  border-left: 1px solid var(--border-dim);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
  position: relative;
}

.settings-panel::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg,
      rgba(var(--accent2-rgb), .2) 0%,
      rgba(var(--accent-rgb), .1) 50%,
      transparent 100%);
  z-index: 1;
}

.settings-header {
  padding: 15px 16px;
  font-size: .82rem;
  font-weight: 700;
  color: var(--text);
  border-bottom: 1px solid var(--border-dim);
  display: flex;
  align-items: center;
  gap: 8px;
}

.settings-header svg {
  color: var(--muted);
  flex-shrink: 0;
}

.settings-provider-tag {
  font-size: .7rem;
  color: var(--muted);
  font-weight: 400;
  margin-left: auto;
}

.settings-section {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-dim);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.settings-label {
  font-size: .7rem;
  font-weight: 700;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .08em;
}

.settings-model-select,
.settings-input {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 7px 10px;
  font-size: .8rem;
  font-family: inherit;
  transition: all var(--trans);
  width: 100%;
}

.settings-model-select:hover,
.settings-input:hover {
  border-color: rgba(var(--accent-rgb), .3);
}

.settings-model-select:focus,
.settings-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .08);
  outline: none;
}

.settings-model-select option {
  background: var(--surface);
}

/* System prompt textarea */
.settings-textarea {
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  padding: 8px 10px;
  font-size: .78rem;
  font-family: inherit;
  transition: all var(--trans);
  width: 100%;
  resize: vertical;
  min-height: 60px;
  line-height: 1.5;
}

.settings-textarea:hover {
  border-color: rgba(var(--accent-rgb), .3);
}

.settings-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(var(--accent-rgb), .08);
  outline: none;
}