.main-header {
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: var(--blur-md);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-2xl);
    position: sticky;
    top: 0;
    z-index: var(--z-index-dropdown);
    transition: all var(--transition-base);
}

.main-header.scrolled {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

.menu-toggle:hover {
    transform: scale(1.1);
}

.menu-line {
    width: 100%;
    height: 2px;
    background: var(--color-gray-700);
    transition: var(--transition-base);
}

.menu-toggle.active .menu-line:first-child {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.active .menu-line:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active .menu-line:last-child {
    transform: rotate(-45deg) translate(5px, -5px);
}

.header-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.current-date {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-name {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-700);
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    animation: pulse 2s infinite;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-avatar:hover {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 8px 16px rgba(102, 126, 234, 0.3);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .main-header {
        padding: 0 var(--spacing-lg);
    }
    
    .current-date {
        display: none;
    }
}

@media (max-width: 480px) {
    .main-header {
        padding: 0 var(--spacing-md);
    }

    .user-name {
        display: none;
    }
}