.app-header {
    background-color: var(--color-black);
    padding: 0;
    height: var(--header-height);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    height: var(--header-height);
    padding: 0 var(--spacing-8);
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-6);
    height: 100%;
}

.menu-toggle {
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: var(--spacing-6);
}

.header-logo {
    height: 32px;
    width: auto;
}

.header-title {
    color: var(--color-white);
    font-family: var(--font-family-heading);
    font-size: var(--font-size-2xl);
    margin: 0;
}

.header-center {
    display: flex;
    align-items: center;
    justify-content: center;
    flex: 1;
    padding: 0 var(--spacing-8);
}

.global-selectors {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
}

.selector-group {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-4);
}

.selector-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    margin: 0;
}

.selector-label i {
    font-size: var(--font-size-base);
    opacity: 0.9;
}

.selector-label .label-text {
    font-weight: 600;
}

.header-select {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-family: var(--font-family-base);
    min-width: 180px;
    cursor: pointer;
    transition: all var(--transition-base);
}

.header-select:hover:not(:disabled) {
    background-color: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
}

.header-select:focus {
    outline: none;
    background-color: rgba(255, 255, 255, 0.2);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(255, 207, 1, 0.2);
}

.header-select:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.header-select option {
    background-color: var(--color-white);
    color: var(--color-text);
    padding: var(--spacing-2);
}

.header-select optgroup {
    font-weight: 600;
    color: var(--color-text-muted);
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    justify-content: flex-end;
}

.user-name {
    color: var(--color-white);
    font-size: var(--font-size-sm);
    margin-right: var(--spacing-4);
    white-space: nowrap;
}

/* Settings Dropdown */
.settings-dropdown {
    position: relative;
    display: flex;
    align-items: center;
}

.settings-icon-btn {
    background: none;
    border: none;
    color: var(--color-white);
    font-size: var(--font-size-xl);
    padding: var(--spacing-2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: all var(--transition-base);
    width: 40px;
    height: 40px;
}

.settings-icon-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: rotate(45deg);
}

.settings-icon-btn.active {
    background-color: rgba(255, 255, 255, 0.15);
    transform: rotate(180deg);
}

.settings-menu {
    position: absolute;
    top: calc(100% + var(--spacing-2));
    right: 0;
    background-color: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: 1100;
    overflow: hidden;
}

.settings-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.settings-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--color-border);
}

.settings-menu-item:last-child {
    border-bottom: none;
}

.settings-menu-item:hover {
    background-color: var(--color-background);
    color: var(--color-primary);
}

.settings-menu-item i {
    font-size: var(--font-size-base);
    width: 20px;
    text-align: center;
}

.settings-menu-item[data-action="logout"] {
    color: var(--color-error);
}

.settings-menu-item[data-action="logout"]:hover {
    background-color: rgba(220, 38, 38, 0.1);
    color: var(--color-error);
}

.nav-link-primary {
    background-color: var(--color-primary);
    border-radius: var(--border-radius);
    padding: var(--spacing-4) var(--spacing-6);
    color: var(--color-primary-dark);
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    min-width: 100px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-base);
    border: none;
    cursor: pointer;
}

.nav-link-primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    text-decoration: none;
}

/* Responsive styles for global selectors */
@media (max-width: 1024px) {
    .header-center {
        padding: 0 var(--spacing-4);
    }
    
    .global-selectors {
        gap: var(--spacing-6);
    }
    
    .header-select {
        min-width: 140px;
        font-size: var(--font-size-xs);
    }
    
    /* Hide label text on tablet, keep icons */
    .selector-label .label-text {
        display: none;
    }
    
    .selector-group {
        gap: var(--spacing-2);
    }

    /* Settings dropdown adjustments for tablet */
    .user-name {
        font-size: var(--font-size-xs);
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
        height: auto;
        min-height: var(--header-height);
    }
    
    .header-center {
        order: 3;
        width: 100%;
        padding: var(--spacing-3) var(--spacing-4);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        justify-content: center;
    }
    
    .global-selectors {
        width: 100%;
        justify-content: space-around;
        gap: var(--spacing-4);
    }
    
    .selector-group {
        flex: 1;
        max-width: 50%;
    }
    
    .header-select {
        width: 100%;
        min-width: 0;
        flex: 1;
    }
    
    /* Hide label text on mobile, keep icons */
    .selector-label .label-text {
        display: none;
    }

    /* Settings dropdown adjustments for mobile */
    .user-name {
        display: none;
    }

    .settings-menu {
        right: var(--spacing-2);
        min-width: 180px;
    }
}

@media (max-width: 480px) {
    .header-select {
        font-size: 12px;
        padding: var(--spacing-1) var(--spacing-2);
    }
    
    .selector-label i {
        font-size: var(--font-size-sm);
    }
    
    .global-selectors {
        gap: var(--spacing-3);
    }

    /* Settings dropdown adjustments for small screens */
    .settings-icon-btn {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-lg);
    }

    .settings-menu {
        min-width: 160px;
    }

    .settings-menu-item {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-xs);
    }
}

/* Client Dropdown Separator Styling */
#globalClientSelector option:disabled {
    color: var(--color-gray-400);
    font-size: var(--font-size-xs);
    background-color: var(--color-gray-100);
    text-align: center;
    cursor: default;
}

/* Ensure Personal client stands out slightly */
#globalClientSelector option[value="Personal"],
#globalClientSelector option[value="PERSONAL"] {
    font-weight: 500;
}