/* ============ MOBILE TOPBAR ============ */
#topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 18px;
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
  z-index: 10;
}

.brain-avatar {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.16), rgba(139, 92, 246, 0.12));
  border: 1px solid rgba(99, 102, 241, 0.25);
  box-shadow: 0 0 12px var(--accent-glow);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: transform 0.2s var(--ease-spring);
}

.brain-avatar:hover {
  transform: scale(1.05);
}

.brain-avatar i {
  font-size: 20px;
}

.brain-avatar i.ti-brain,
#auth-overlay .brain-logo i.ti-brain {
  font-size: 0;
  width: 60%;
  height: 60%;
  background-color: var(--accent);
  mask: var(--sb-mark) center / contain no-repeat;
  -webkit-mask: var(--sb-mark) center / contain no-repeat;
}
.brain-avatar i.ti-brain::before,
#auth-overlay .brain-logo i.ti-brain::before {
  content: none;
}

.topbar-info {
  flex: 1;
  min-width: 0;
}

.topbar-name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.topbar-status {
  font-size: 11.5px;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  line-height: 1.3;
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.topbar-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 6px var(--good);
  flex-shrink: 0;
}

.topbar-menu {
  background: none;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text-secondary);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s, color 0.15s, transform 0.16s var(--ease-spring);
}

.topbar-menu i {
  font-size: 20px;
}

.topbar-menu:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.topbar-menu:active {
  transform: scale(0.94);
}

/* ============ SCREENS ============ */
#screens {
  flex: 1;
  overflow: hidden;
  position: relative;
}

.screen {
  display: none;
  flex-direction: column;
  height: 100%;
  position: absolute;
  inset: 0;
}

.screen.active {
  display: flex;
  animation: screen-in 0.3s var(--ease);
}

@keyframes screen-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ MOBILE BOTTOM NAV ============ */
#navbar {
  display: flex;
  position: relative;
  flex-shrink: 0;
  background: var(--surface-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  padding: 6px 12px max(env(safe-area-inset-bottom), 10px);
  z-index: 20;
  justify-content: space-around;
}

.nav-tab {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-tertiary);
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 500;
  border-radius: 14px;
  gap: 4px;
  transition: all 0.18s var(--ease);
}

.nav-tab i {
  font-size: 20px;
  transition: transform 0.2s var(--ease-spring);
}

.nav-tab:hover {
  color: var(--text-primary);
}

.nav-tab:active {
  transform: scale(0.95);
}

.nav-tab.active {
  color: var(--accent);
  background: var(--accent-soft);
  font-weight: 600;
}

.nav-tab.active i {
  transform: scale(1.1);
}

/* ============ DESKTOP SIDEBAR ============ */
#sidebar {
  width: 260px;
  flex-shrink: 0;
  flex-direction: column;
  background: var(--bg);
  border-right: 1px solid var(--border);
  padding: 24px 14px 20px;
  z-index: 20;
}

.sb-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 10px 24px;
}

.sb-brand-name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.sb-brand-status {
  font-size: 11.5px;
  font-family: var(--font-mono);
  color: var(--text-tertiary);
  margin-top: 2px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.sb-brand-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 6px var(--good);
}

.sb-nav {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sb-tab {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 12px;
  background: none;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-sans);
  width: 100%;
  text-align: left;
  transition: all 0.16s var(--ease);
}

.sb-tab i {
  font-size: 19px;
  color: var(--text-tertiary);
  transition: color 0.16s, transform 0.16s var(--ease-spring);
}

.sb-tab:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.sb-tab:hover i {
  color: var(--text-primary);
  transform: scale(1.05);
}

.sb-tab:active {
  transform: scale(0.97);
}

.sb-tab.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
  border-color: rgba(99, 102, 241, 0.18);
  position: relative;
}

.sb-tab.active i {
  color: var(--accent);
}

.sb-tab.active::before {
  content: '';
  position: absolute;
  left: -2px;
  top: 25%;
  bottom: 25%;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.sb-footer {
  padding-top: 14px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sb-footer-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 12px;
  border-radius: 10px;
  background: none;
  border: 1px solid transparent;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  font-family: var(--font-sans);
  width: 100%;
  text-align: left;
  text-decoration: none;
  transition: all 0.15s;
}

.sb-footer-btn i {
  font-size: 18px;
  color: var(--text-tertiary);
}

.sb-footer-btn:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.sb-footer-btn:hover i {
  color: var(--text-primary);
}

.sb-footer-btn:active {
  transform: scale(0.97);
}

.refresh-now.spinning i {
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Download-the-app CTA (sidebar footer) */
#sb-download-app,
.download-app-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  margin-bottom: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--accent-gradient);
  color: #ffffff !important;
  font-size: 13.5px;
  font-weight: 600;
  text-decoration: none !important;
  white-space: nowrap;
  box-shadow: 0 2px 10px var(--accent-glow);
  cursor: pointer;
  transition: transform 0.16s var(--ease-spring), box-shadow 0.2s, filter 0.16s;
}

#sb-download-app i,
.download-app-btn i {
  color: inherit;
  font-size: 17px;
}

#sb-download-app:hover,
.download-app-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
  color: #ffffff !important;
}

#sb-download-app:active,
.download-app-btn:active {
  transform: scale(0.97);
}