/* ==========================================================================
   Header Bar
   ========================================================================== */
header.app-header {
  height: 52px;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  z-index: 100;
  flex-shrink: 0;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  user-select: none;
  flex-shrink: 0;
}

.brand-logo {
  width: 28px;
  height: 28px;
  border-radius: 6px;
  background: var(--accent-subtle);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-text {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
}

.brand-title {
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.brand-tag {
  font-size: 0.62rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--text-dim);
  background: var(--bg-pill);
  padding: 1px 4px;
  border-radius: 3px;
  border: 1px solid var(--border-color);
}

/* Route Status Pill */
.route-pill {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-pill);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 0.3rem 0.75rem;
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-secondary);
  max-width: 420px;
  flex-shrink: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.route-pill svg {
  color: var(--accent);
  flex-shrink: 0;
}

/* Header Actions */
.actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-shrink: 0;
}

.action-divider {
  width: 1px;
  height: 20px;
  background: var(--border-color);
  margin: 0 0.2rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.38rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.12s ease;
  user-select: none;
  white-space: nowrap;
}

.btn:hover:not(:disabled) {
  background: var(--bg-pill);
  border-color: var(--border-hover);
}

.btn:active:not(:disabled) {
  transform: translateY(1px);
}

.btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #ffffff;
}

.btn-secondary {
  background: var(--bg-pill);
  border-color: var(--border-color);
  color: var(--text-primary);
  font-weight: 600;
}

#btn-share-link:not(:disabled) {
  border-color: rgba(37, 99, 235, 0.35);
  color: var(--accent);
}

#btn-share-link:not(:disabled):hover {
  background: var(--accent-subtle);
  border-color: var(--accent);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-pill-hover);
  border-color: var(--border-hover);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-pill);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-icon {
  padding: 0.38rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Theme Icons Toggle */
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

/* ==========================================================================
   Mobile Tab Switcher Navigation
   ========================================================================== */
.mobile-tab-nav {
  display: none;
  background: var(--bg-header);
  border-bottom: 1px solid var(--border-color);
  padding: 0.35rem 0.65rem;
  gap: 0.35rem;
  z-index: 90;
  flex-shrink: 0;
}

.mobile-tab-btn {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.45rem 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.12s ease;
  user-select: none;
  min-height: 38px;
}

.mobile-tab-btn:hover {
  color: var(--text-primary);
  background: var(--bg-pill-hover);
}

.mobile-tab-btn.active {
  color: var(--accent);
  background: var(--accent-subtle);
  border-color: rgba(37, 99, 235, 0.25);
}

.mobile-tab-count {
  font-size: 0.65rem;
  font-weight: 700;
  font-family: var(--font-mono);
  background: var(--bg-pill);
  border: 1px solid var(--border-color);
  color: var(--text-dim);
  padding: 1px 5px;
  border-radius: 10px;
}

.mobile-tab-btn.active .mobile-tab-count {
  background: rgba(37, 99, 235, 0.15);
  border-color: rgba(37, 99, 235, 0.3);
  color: var(--accent);
}